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Psoriasis is a characteristic inflammatory and scaly skin condition with typical histopathological features including increased proliferation and hampered differentiation of keratinocytes. The activation of innate and adaptive inflammatory cellular immune responses is considered to be the main trigger factor of the epidermal changes in psoriatic skin. However, the molecular players that are involved in enhanced proliferation and impaired differentiation of psoriatic keratinocytes are only partly understood. One important factor that regulates differentiation on the cellular level is Ca2+. In normal epidermis, a Ca2+ gradient exists that is disturbed in psoriatic plaques, favoring impaired keratinocyte proliferation. Several TRPC channels such as TRPC1, TRPC4, or TRPC6 are key proteins in the regulation of high [Ca2+]ex induced differentiation. Here, we investigated if TRPC channel function is impaired in psoriasis using calcium imaging, RT-PCR, western blot analysis and immunohistochemical staining of skin biopsies. We demonstrated substantial defects in Ca2+ influx in psoriatic keratinocytes in response to high extracellular Ca2+ levels, associated with a downregulation of all TRPC channels investigated, including TRPC6 channels. As TRPC6 channel activation can partially overcome this Ca2+ entry defect, specific TRPC channel activators may be potential new drug candidates for the topical treatment of psoriasis.
Glycyrrhizin is known to exert antiviral and anti-inflammatory effects. Here, the effects of an approved parenteral glycyrrhizin preparation (Stronger Neo-Minophafen C) were investigated on highly pathogenic influenza A H5N1 virus replication, H5N1-induced apoptosis, and H5N1-induced pro-inflammatory responses in lung epithelial (A549) cells. Therapeutic glycyrrhizin concentrations substantially inhibited H5N1-induced expression of the pro-inflammatory molecules CXCL10, interleukin 6, CCL2, and CCL5 (effective glycyrrhizin concentrations 25 to 50 µg/ml) but interfered with H5N1 replication and H5N1-induced apoptosis to a lesser extent (effective glycyrrhizin concentrations 100 µg/ml or higher). Glycyrrhizin also diminished monocyte migration towards supernatants of H5N1-infected A549 cells. The mechanism by which glycyrrhizin interferes with H5N1 replication and H5N1-induced pro-inflammatory gene expression includes inhibition of H5N1-induced formation of reactive oxygen species and (in turn) reduced activation of NFKappaB, JNK, and p38, redox-sensitive signalling events known to be relevant for influenza A virus replication. Therefore, glycyrrhizin may complement the arsenal of potential drugs for the treatment of H5N1 disease.
Background: In endothelial cells, activation of the AMP-activated protein kinase (AMPK) has been linked with anti-inflammatory actions but the events downstream of kinase activation are not well understood. Here, we addressed the effects of AMPK activation/deletion on the activation of NFKappaB and determined whether the AMPK could contribute to the anti-inflammatory actions of nitric oxide (NO). Methodology/Principal Findings: Overexpression of a dominant negative AMPKalpha2 mutant in tumor necrosis factor-alpha-stimulated human endothelial cells resulted in increased NFKappaB activity, E-selectin expression and monocyte adhesion. In endothelial cells from AMPKalpha2-/- mice the interleukin (IL)-1beta induced expression of E-selectin was significantly increased. DETA-NO activated the AMPK and attenuated NFKappaB activation/E-selectin expression, effects not observed in human endothelial cells in the presence of the dominant negative AMPK, or in endothelial cells from AMPKalpha2-/- mice. Mechanistically, overexpression of constitutively active AMPK decreased the phosphorylation of IKappaB and p65, indicating a link between AMPK and the IKappaB kinase (IKK). Indeed, IKK (more specifically residues Ser177 and Ser181) was found to be a direct substrate of AMPKalpha2 in vitro. The hyper-phosphorylation of the IKK, which is known to result in its inhibition, was also apparent in endothelial cells from AMPKalpha2+/+ versus AMPKalpha2-/- mice. Conclusions: These results demonstrate that the IKK is a direct substrate of AMPKalpha2 and that its phosphorylation on Ser177 and Ser181 results in the inhibition of the kinase and decreased NFKappaB activation. Moreover, as NO potently activates AMPK in endothelial cells, a portion of the anti-inflammatory effects of NO are mediated by AMPK.
Chromosomal translocations can lead to the formation of chimeric genes encoding fusion proteins such as PML/RARalpha, PLZF/RARalpha, and AML-1/ETO, which are able to induce and maintain acute myeloid leukemia (AML). One key mechanism in leukemogenesis is increased self renewal of leukemic stem cells via aberrant activation of the Wnt signaling pathway. Either X-RAR, PML/RARalpha and PLZF/RARalpha or AML-1/ETO activate Wnt signaling by upregulating gamma-catenin and beta-catenin. In a prospective study, a lower risk of leukemia was observed with aspirin use, which is consistent with numerous studies reporting an inverse association of aspirin with other cancers. Furthermore, a reduction in leukemia risk was associated with use of non-steroidal anti-inflammatory drug (NSAID), where the effects on AML risk was FAB subtype-specific. To better investigate whether NSAID treatment is effective, we used Sulindac Sulfide in X-RARalpha-positive progenitor cell models. Sulindac Sulfide (SSi) is a derivative of Sulindac, a NSAID known to inactivate Wnt signaling. We found that SSi downregulated both beta-catenin and gamma-catenin in X-RARalpha-expressing cells and reversed the leukemic phenotype by reducing stem cell capacity and increasing differentiation potential in X-RARalpha-positive HSCs. The data presented herein show that SSi inhibits the leukemic cell growth as well as hematopoietic progenitors cells (HPCs) expressing PML/RARalpha, and it indicates that Sulindac is a valid molecular therapeutic approach that should be further validated using in vivo leukemia models and in clinical settings.
Background: Decoding of frequency-modulated (FM) sounds is essential for phoneme identification. This study investigates selectivity to FM direction in the human auditory system. Methodology/Principal Findings: Magnetoencephalography was recorded in 10 adults during a two-tone adaptation paradigm with a 200-ms interstimulus-interval. Stimuli were pairs of either same or different frequency modulation direction. To control that FM repetition effects cannot be accounted for by their on- and offset properties, we additionally assessed responses to pairs of unmodulated tones with either same or different frequency composition. For the FM sweeps, N1m event-related magnetic field components were found at 103 and 130 ms after onset of the first (S1) and second stimulus (S2), respectively. This was followed by a sustained component starting at about 200 ms after S2. The sustained response was significantly stronger for stimulation with the same compared to different FM direction. This effect was not observed for the non-modulated control stimuli. Conclusions/Significance: Low-level processing of FM sounds was characterized by repetition enhancement to stimulus pairs with same versus different FM directions. This effect was FM-specific; it did not occur for unmodulated tones. The present findings may reflect specific interactions between frequency separation and temporal distance in the processing of consecutive FM sweeps.
Background: Glioblastoma is the most frequent and most malignant primary brain tumor with a poor prognosis. The translation of therapeutic strategies for glioblastoma from the experimental phase into the clinic has been limited by insufficient animal models, which lack important features of human tumors. Lentiviral gene therapy is an attractive therapeutic option for human glioblastoma, which we validated in a clinically relevant animal model. Methodology/Principal Findings: We used a rodent xenograft model that recapitulates the invasive and angiogenic features of human glioblastoma to analyze the transduction pattern and therapeutic efficacy of lentiviral pseudotyped vectors. Both, lymphocytic choriomeningitis virus glycoprotein (LCMV-GP) and vesicular stomatitis virus glycoprotein (VSV-G) pseudotyped lentiviral vectors very efficiently transduced human glioblastoma cells in vitro and in vivo. In contrast, pseudotyped gammaretroviral vectors, similar to those evaluated for clinical therapy of glioblastoma, showed inefficient gene transfer in vitro and in vivo. Both pseudotyped lentiviral vectors transduced cancer stem-like cells characterized by their CD133-, nestin- and SOX2-expression, the ability to form spheroids in neural stem cell medium and to express astrocytic and neuronal differentiation markers under serum conditions. In a therapeutic approach using the suicide gene herpes simplex virus thymidine kinase (HSV-1-tk) fused to eGFP, both lentiviral vectors mediated a complete remission of solid tumors as seen on MRI resulting in a highly significant survival benefit (p<0.001) compared to control groups. In all recurrent tumors, surviving eGFP-positive tumor cells were found, advocating prodrug application for several cycles to even enhance and prolong the therapeutic effect. Conclusions/Significance: In conclusion, lentiviral pseudotyped vectors are promising candidates for gene therapy of glioma in patients. The inefficient gene delivery by gammaretroviral vectors is in line with the results obtained in clinical therapy for GBM and thus confirms the high reproducibility of the invasive glioma animal model for translational research.
Background: The BH3-only protein Bid is an important component of death receptor-mediated caspase activation. Bid is cleaved by caspase-8 or -10 into t-Bid, which translocates to mitochondria and triggers the release of caspase-activating factors. Bid has also been reported to be cleaved by other proteases. Methodology/Principal Findings: To test the hypothesis that Bid is a central mediator of stress-induced apoptosis, we investigated the effects of a small molecule Bid inhibitor on stress-induced apoptosis, and generated HeLa cells deficient for Bid. Stable knockdown of bid lead to a pronounced resistance to Fas/CD95- and TRAIL-induced caspase activation and apoptosis, and significantly increased clonogenic survival. While Bid-deficient cells were equally sensitive to ER stress-induced apoptosis, they showed moderate, but significantly reduced levels of apoptosis, as well as increased clonogenic survival in response to the genotoxic drugs Etoposide, Oxaliplatin, and Doxorubicin. Similar effects were observed using the Bid inhibitor BI6C9. Interestingly, Bid-deficient cells were dramatically protected from apoptosis when subtoxic concentrations of ER stressors, Etoposide or Oxaliplatin were combined with subtoxic TRAIL concentrations. Conclusions/Significance: Our data demonstrate that Bid is central for death receptor-induced cell death and participates in anti-cancer drug-induced apoptosis in human cervical cancer HeLa cells. They also show that the synergistic effects of TRAIL in combination with either ER stressors or genotoxic anti-cancer drugs are nearly exclusively mediated via an increased activation of Bid-induced apoptosis signalling.
Background: Metabolic engineering is an attractive approach in order to improve the microbial production of drugs. Triterpenes is a chemically diverse class of compounds and many among them are of interest from a human health perspective. A systematic experimental or computational survey of all feasible gene modifications to determine the genotype yielding the optimal triterpene production phenotype is a laborious and time-consuming process. Methodology/Principal Findings: Based on the recent genome-wide sequencing of Saccharomyces cerevisiae CEN.PK 113-7D and its phenotypic differences with the S288C strain, we implemented a strategy for the construction of a beta-amyrin production platform. The genes Erg8, Erg9 and HFA1 contained non-silent SNPs that were computationally analyzed to evaluate the changes that cause in the respective protein structures. Subsequently, Erg8, Erg9 and HFA1 were correlated with the increased levels of ergosterol and fatty acids in CEN.PK 113-7D and single, double, and triple gene over-expression strains were constructed. Conclusions: The six out of seven gene over-expression constructs had a considerable impact on both ergosterol and beta-amyrin production. In the case of beta-amyrin formation the triple over-expression construct exhibited a nearly 500% increase over the control strain making our metabolic engineering strategy the most successful design of triterpene microbial producers.
The construct diversity describes the collective amount of differences among members within a social unit. The present dissertation is based on the assumption that, through engagement with diversity, people acquire an understanding of what role diversity plays in the societies, organizations, work groups, or other social units they are part of. This understanding of the role diversity plays in a given social unit provides a vantage point from which people will engage with diversity in the future. These vantage points from which people engage with diversity are the general subject matter of the present dissertation. Two main research questions are addressed in this regard: First, whether the role diversity is given in a particular context does have effects on groups and the individual members therein. Second, if such effects exist, it seeks to explore the processes and mechanisms they are based on. Both questions are addressed from different perspectives in the three main chapters of this dissertation. Chapter 5 contains two meta-analyses on the effects of diversity beliefs and diversity climates. Diversity beliefs are individual attitudes that describe the degree to which diversity is ascribed an instrumental value for achieving beneficial outcomes or avoiding detrimental ones. Diversity climates depict such a value of diversity on the group-level. Building on the social identity approach, I explain how diversity beliefs and climates can obviate diversity’s detrimental effects and foster beneficial ones. As both diversity beliefs and climates can cause such effects, they are considered together in the main analyses in the chapter. In the first part of the chapter, a meta-analysis on these moderator effects of diversity beliefs/climates is presented (k = 23). The majority of studies that addressed such effects reported significant results. The patterns of these results showed that, in general, diversity will be more positively related to beneficial outcomes the more it is valued. However, the analysis also revealed that there are at least two types of patterns of this moderation. So far, it cannot be explained which pattern will occur under what circumstances. In the second part of the chapter, a meta-analysis on the main effects of diversity beliefs/climates on beneficial outcomes is presented (k = 71). These effects did not receive much attention in the primary studies. Based on the social identity approach and the fact that diversity is a ubiquitous feature of modern organizations, I argue that they are important nonetheless. The meta-analysis revealed a significant positive main effect of diversity beliefs on beneficial outcomes (r = .25; p < .0001). However, the effect sizes varied considerably across studies. Both moderator and main effects were found across a broad array of outcomes, study designs, levels of analysis, and operationalizations of the constructs involved. They were found irrespective of whether diversity beliefs or diversity climates were considered. The heterogeneity of results in the meta-analyses suggests that there is still much to be learned about when differences in vantage points from which people engage with diversity will have an effect and about the processes that underlie these effects. Chapter 6 is, therefore, predominantly concerned with these underlying processes. Most of the previous research has treated pro-diversity beliefs and pro-similarity beliefs as opposite poles of one underlying continuum. There is, however, evidence that people can hold both types of beliefs simultaneously. Therefore, I propose that both diversity in certain aspects and similarity in other aspects can simultaneously constitute valid and valued parts of an organization’s identity, and that, hence, identifying with the organization can create two forms of solidarity among the employees: organic solidarity – based on meaningfully and synergistically interrelated differences, and mechanic solidarity – based on the common ground that all employees share. Furthermore, I propose that both forms of solidarity can coexist and that both are positively related to the quality of collaboration within the organization. Thus, organizational identification is proposed to influence quality of collaboration indirectly through both organic and mechanic solidarity. These propositions were tested with regard to the collaboration of different teams within two organizations: a German university (Study 1, N = 699) and a Taiwanese hospital (Study 2, N = 591). The results from both studies confirm the predictions. However, the relative importance of each form of solidarity varied across study contexts and across different facets of the quality of collaboration. Chapter 7 also builds on the findings from the meta-analyses and is again predominantly focussed on the processes underlying the effects of diversity beliefs and diversity climates, yet from a different angle. Previously, diversity beliefs and climates have often been discussed with regard to their potential to influence whether diversity will lead to more and deeper elaboration of information within the group. In chapter 7 a theoretical model is developed that complements these cognitive processes by addressing the emotional side of diverse groups. Central to the model is the assumption that group diversity can stimulate group members to engage with each other emotionally, resulting in higher levels of state affective empathy: an emotional state which arises from the comprehension and apprehension of fellow group members’ emotional state. State affective empathy, in turn, is known to lead to a variety of beneficial team processes that can ultimately enhance individual and group-level performance. Thus, the central proposition of the model is that the relationship between diversity and performance is mediated through state affective empathy. The other propositions in the model specify moderators that determine when diversity will indeed have this empathy-stimulating effect. Diversity beliefs and climates are considered second-order moderators that shape the relationship between diversity and empathy through their influence on the first-order moderators. In general, it is proposed that diversity is related to empathy more positively if it is valued by the group or its members. In summary, the results from the meta-analyses in chapter 5, the results from the field studies in chapter 6, and the theoretical arguments presented in chapter 7 can be interpreted such that differences in vantage points from which people engage with diversity can indeed affect groups and their members. Therefore, the first research question of the present dissertation can be answered affirmatively from three different perspectives. However, it also became clear that there is still much uncertainty about the mechanisms underlying these effects. In line with the second research question of the present dissertation, these mechanisms were examined more closely in chapter 6 and 7. The field studies in chapter 6 highlighted the role of identification as the driving force behind the effects of different vantage points on diversity. Furthermore, they also corroborate the proposition that valuing diversity and valuing similarity can be co-occurring phenomena that both influence the collaboration within the group positively. The theoretical model presented in chapter 7 opens up a new emotional way in which diversity beliefs and climates can influence whether diversity will lead to better or worse performance. In sum, therefore, also with regard to the second research question of the present dissertation, progress has been made.
The phenomenon of magnetism is a pure quantum effect and has been studied since the beginning of civilization. The practical use of magnetic materials for technical purposes was well established in the 19th century; still nowadays there is no lack of new high-tech applications based on magnetism for example in information technology to store and process data. This thesis does not focus on the development of new applications of magnetism in technology, nor enhancement of known fields of application. Instead, the intention is to use a quantum theory of magnetism for obtaining new insights on physical effects that accompany the phenomenon of magnetism. Therefore three different model systems, each of which are believed to describe a class of real compounds, are considered. Starting from the idea that magnetism can be understood by use of the so-called Heisenberg model that microscopically characterizes the interaction between localized magnetic moments, we restrict ourselves to the case where a long-range magnetic order is present. In order to deduce consequences resulting from this microscopic picture we use the spin-wave theory that is introduced in the first chapter. Central objects of this theory are the magnons which are elementary quantum excitations in ordered magnets. An application of these mathematical techniques to a model that describes an antiferromagnet in an external magnetic field is presented in the second chapter. Quantities like the spin-wave velocity and the damping of magnons are calculated using a Hermitian operator approach in the framework of spin-wave theory. A strong renormalization of the magnetic excitations arises because the symmetry of the system is reduced due to the external magnetic field. In the second model system, that describes thin films of a ferromagnet, concepts of classical physics meet quantum physics: The magnetic dipole-dipole interaction that is also known in everyday life from the magnetic forces between magnets and was initially formulated in the theory of electromagnetism, is included in the microscopic model. Having a special compound in mind where the magnetic excitations are directly accessible in experiments, the energy dispersions of magnon modes in thin-film ferromagnets are deduced. Our approach is essentially a basis for further investigations beyond this thesis to describe strong correlations and condensation of magnons. A recent realization of data processing devices with spin waves puts the understanding of physical processes in these ferromagnetic films in the focus of upcoming research. The third model system brings in the so-called frustration where the interactions between the spins are such that the total energy cannot be minimized by an appropriate alignment of the magnetic moments in the classical picture. In the simplest case this appears because the antiferromagnetically coupled spins are located on a triangular lattice. This situation will lead to strong quantum fluctuations which make this model system interesting. Finally the overall symmetry is reduced by inclusion of spin anisotropies and an external magnetic field. Instead of focusing on the properties of the magnetic excitations, the effect of the magnetic field on the properties of the lattice vibrations is subject to the investigation. This is interesting because the characteristics of lattice vibrations can be measured experimentally using the supersonic technique.
Variants resistant to compounds specifically targeting HCV are observed in clinical trials. A multi-variant viral dynamic model was developed to quantify the evolution and in vivo fitness of variants in subjects dosed with monotherapy of an HCV protease inhibitor, telaprevir. Variant fitness was estimated using a model in which variants were selected by competition for shared limited replication space. Fitness was represented in the absence of telaprevir by different variant production rate constants and in the presence of telaprevir by additional antiviral blockage by telaprevir. Model parameters, including rate constants for viral production, clearance, and effective telaprevir concentration, were estimated from 1) plasma HCV RNA levels of subjects before, during, and after dosing, 2) post-dosing prevalence of plasma variants from subjects, and 3) sensitivity of variants to telaprevir in the HCV replicon. The model provided a good fit to plasma HCV RNA levels observed both during and after telaprevir dosing, as well as to variant prevalence observed after telaprevir dosing. After an initial sharp decline in HCV RNA levels during dosing with telaprevir, HCV RNA levels increased in some subjects. The model predicted this increase to be caused by pre-existing variants with sufficient fitness to expand once available replication space increased due to rapid clearance of wild-type (WT) virus. The average replicative fitness estimates in the absence of telaprevir ranged from 1% to 68% of WT fitness. Compared to the relative fitness method, the in vivo estimates from the viral dynamic model corresponded more closely to in vitro replicon data, as well as to qualitative behaviors observed in both on-dosing and long-term post-dosing clinical data. The modeling fitness estimates were robust in sensitivity analyses in which the restoration dynamics of replication space and assumptions of HCV mutation rates were varied.
Bacteria are generally assumed to be monoploid (haploid). This assumption is mainly based on generalization of the results obtained with the most intensely studied model bacterium, Escherichia coli (a gamma-proteobacterium), which is monoploid during very slow growth. However, several species of proteobacteria are oligo- or polyploid, respectively. To get a better overview of the distribution of ploidy levels, genome copy numbers were quantified in four species of three different groups of proteobacteria. A recently developed Real Time PCR approach, which had been used to determine the ploidy levels of halophilic archaea, was optimized for the quantification of genome copy numbers of bacteria. Slow-growing (doubling time 103 minutes) and fast-growing (doubling time 25 minutes) E. coli cultures were used as a positive control. The copy numbers of the origin and terminus region of the chromosome were determined and the results were in excellent agreement with published data. The approach was also used to determine the ploidy levels of Caulobacter crescentus (an alpha-proteobacterium) and Wolinella succinogenes (an epsilon-proteobacterium), both of which are monoploid. In contrast, Pseudomonas putida (a gamma-proteobacterium) contains 20 genome copies and is thus polyploid. A survey of the proteobacteria with experimentally-determined genome copy numbers revealed that only three to four of 11 species are monoploid and thus monoploidy is not typical for proteobacteria. The ploidy level is not conserved within the groups of proteobacteria, and there are no obvious correlations between the ploidy levels with other parameters like genome size, optimal growth temperature or mode of life.
The continuous progress in the structural and functional characterization of aquaporins increasingly attracts attention to study their roles in certain mammalian diseases. Although several structures of aquaporins have already been solved by crystallization, the challenge of producing sufficient amounts of functional proteins still remains. CF (cell free) expression has emerged in recent times as a promising alternative option in order to synthesize large quantities of membrane proteins, and the focus of this report was to evaluate the potential of this technique for the production of eukaryotic aquaporins. We have selected the mouse aquaporin 4 as a representative of mammalian aquaporins. The protein was synthesized in an E. coli extract based cell-free system with two different expression modes, and the efficiencies of two modes were compared. In both, the P-CF (cell-free membrane protein expression as precipitate) mode generating initial aquaporin precipitates as well as in the D-CF (cell-free membrane protein expression in presence of detergent) mode, generating directly detergent solubilized samples, we were able to obtain mg amounts of protein per ml of cell-free reaction. Purified aquaporin samples solubilized in different detergents were reconstituted into liposomes, and analyzed for the water channel activity. The calculated Pf value of proteoliposome samples isolated from the D-CF mode was 133 µm/s at 10°C, which was 5 times higher as that of the control. A reversible inhibitory effect of mercury chloride was observed, which is consistent with previous observations of in vitro reconstituted aquaporin 4. In this study, a fast and convenient protocol was established for functional expression of aquaporins, which could serve as basis for further applications such as water filtration.
Dual function of the NK cell receptor 2B4 (CD244) in the regulation of HCV-specific CD8+ T cells
(2011)
The outcome of viral infections is dependent on the function of CD8+ T cells which are tightly regulated by costimulatory molecules. The NK cell receptor 2B4 (CD244) is a transmembrane protein belonging to the Ig superfamily which can also be expressed by CD8+ T cells. The aim of this study was to analyze the role of 2B4 as an additional costimulatory receptor regulating CD8+ T cell function and in particular to investigate its implication for exhaustion of hepatitis C virus (HCV)-specific CD8+ T cells during persistent infection. We demonstrate that (i) 2B4 is expressed on virus-specific CD8+ T cells during acute and chronic hepatitis C, (ii) that 2B4 cross-linking can lead to both inhibition and activation of HCV-specific CD8+ T cell function, depending on expression levels of 2B4 and the intracellular adaptor molecule SAP and (iii) that 2B4 stimulation may counteract enhanced proliferation of HCV-specific CD8+ T cells induced by PD1 blockade. We suggest that 2B4 is another important molecule within the network of costimulatory/inhibitory receptors regulating CD8+ T cell function in acute and chronic hepatitis C and that 2B4 expression levels could also be a marker of CD8+ T cell dysfunction. Understanding in more detail how 2B4 exerts its differential effects could have implications for the development of novel immunotherapies of HCV infection aiming to achieve immune control.
Background: A delta and C fibers are the major pain-conducting nerve fibers, activate only partly the same brain areas, and are differently involved in pain syndromes. Whether a stimulus excites predominantly A delta or C fibers is a commonly asked question in basic pain research but a quick test was lacking so far. Methodology/Principal Findings: Of 77 verbal descriptors of pain sensations, "pricking", "dull" and "pressing" distinguished best (95% cases correctly) between A delta fiber mediated (punctate pressure produced by means of von Frey hairs) and C fiber mediated (blunt pressure) pain, applied to healthy volunteers in experiment 1. The sensation was assigned to A delta fibers when "pricking" but neither "dull" nor "pressing" were chosen, and to C fibers when the sum of the selections of "dull" or "pressing" was greater than that of the selection of "pricking". In experiment 2, with an independent cohort, the three-descriptor questionnaire achieved sensitivity and specificity above 0.95 for distinguishing fiber preferential non-mechanical induced pain (laser heat, exciting A delta fibers, and 5-Hz electric stimulation, exciting C fibers). Conclusion: A three-item verbal rating test using the words "pricking", "dull", and "pressing" may provide sufficient information to characterize a pain sensation evoked by a physical stimulus as transmitted via A delta or via C fibers. It meets the criteria of a screening test by being easy to administer, taking little time, being comfortable in handling, and inexpensive while providing high specificity for relevant information.
Activation of hypoxia inducible factor 1 is a general phenomenon in infections with human pathogens
(2010)
Background: Hypoxia inducible factor (HIF)-1 is the key transcriptional factor involved in the adaptation process of cells and organisms to hypoxia. Recent findings suggest that HIF-1 plays also a crucial role in inflammatory and infectious diseases. Methodology/Principal Findings: Using patient skin biopsies, cell culture and murine infection models, HIF-1 activation was determined by immunohistochemistry, immunoblotting and reporter gene assays and was linked to cellular oxygen consumption. The course of a S. aureus peritonitis was determined upon pharmacological HIF-1 inhibition. Activation of HIF-1 was detectable (i) in all ex vivo in biopsies of patients suffering from skin infections, (ii) in vitro using cell culture infection models and (iii) in vivo using murine intravenous and peritoneal S. aureus infection models. HIF-1 activation by human pathogens was induced by oxygen-dependent mechanisms. Small colony variants (SCVs) of S. aureus known to cause chronic infections did not result in cellular hypoxia nor in HIF-1 activation. Pharmaceutical inhibition of HIF-1 activation resulted in increased survival rates of mice suffering from a S. aureus peritonitis. Conclusions/Significance: Activation of HIF-1 is a general phenomenon in infections with human pathogenic bacteria, viruses, fungi and protozoa. HIF-1-regulated pathways might be an attractive target to modulate the course of life-threatening infections.
DEAD-box proteins are enzymes endowed with nucleic acid-dependent ATPase, RNA translocase and unwinding activities. The human DEAD-box protein DDX3 has been shown to play important roles in tumor proliferation and viral infections. In particular, DDX3 has been identified as an essential cofactor for HIV-1 replication. Here we characterized a set of DDX3 mutants biochemically with respect to nucleic acid binding, ATPase and helicase activity. In particular, we addressed the functional role of a unique insertion between motifs I and Ia of DDX3 and provide evidence for its implication in nucleic acid binding and HIV-1 replication. We show that human DDX3 lacking this domain binds HIV-1 RNA with lower affinity. Furthermore, a specific peptide ligand for this insertion selected by phage display interferes with HIV-1 replication after transduction into HelaP4 cells. Besides broadening our understanding of the structure-function relationships of this important protein, our results identify a specific domain of DDX3 which may be suited as target for antiviral drugs designed to inhibit cellular cofactors for HIV-1 replication.
Ataxia represents a pathological coordination failure that often involves functional disturbances in cerebellar circuits. Purkinje cells (PCs) characterize the only output neurons of the cerebellar cortex and critically participate in regulating motor coordination. Although different genetic mutations are known that cause ataxia, little is known about the underlying cellular mechanisms. Here we show that a mutated axJ gene locus, encoding the ubiquitin-specific protease 14 (Usp14), negatively influences synaptic receptor turnover. AxJ mouse mutants, characterized by cerebellar ataxia, display both increased GABAA receptor (GABAAR) levels at PC surface membranes accompanied by enlarged IPSCs. Accordingly, we identify physical interaction of Usp14 and the GABAAR alpha 1 subunit. Although other currently unknown changes might be involved, our data show that ubiquitin-dependent GABAAR turnover at cerebellar synapses contributes to axJ-mediated behavioural impairment.
Background: There is currently no effective AIDS vaccine, emphasizing the importance of developing alternative therapies. Recently, a patient was successfully transplanted with allogeneic, naturally resistant CCR5-negative (CCR5 delta 32) cells, setting the stage for transplantation of naturally resistant, or genetically modified stem cells as a viable therapy for AIDS. Hematopoietic stem cell (HSC) gene therapy using vectors that express various anti-HIV transgenes has also been attempted in clinical trials, but inefficient gene transfer in these studies has severely limited the potential of this approach. Here we evaluated HSC gene transfer of an anti-HIV vector in the pigtailed macaque (Macaca nemestrina) model, which closely models human transplantation. Methods and Findings: We used lentiviral vectors that inhibited both HIV-1 and simian immunodeficiency virus (SIV)/HIV-1 (SHIV) chimera virus infection, and also expressed a P140K mutant methylguanine methyltransferase (MGMT) transgene to select gene-modified cells by adding chemotherapy drugs. Following transplantation and MGMT-mediated selection we demonstrated transgene expression in over 7% of stem-cell derived lymphocytes. The high marking levels allowed us to demonstrate protection from SHIV in lymphocytes derived from gene-modified macaque long-term repopulating cells that expressed an HIV-1 fusion inhibitor. We observed a statistically significant 4-fold increase of gene-modified cells after challenge of lymphocytes from one macaque that received stem cells transduced with an anti-HIV vector (p<0.02, Student's t-test), but not in lymphocytes from a macaque that received a control vector. We also established a competitive repopulation assay in a second macaque for preclinical testing of promising anti-HIV vectors. The vectors we used were HIV-based and thus efficiently transduce human cells, and the transgenes we used target HIV-1 genes that are also in SHIV, so our findings can be rapidly translated to the clinic. Conclusions: Here we demonstrate the ability to select protected HSC-derived lymphocytes in vivo in a clinically relevant nonhuman primate model of HIV/SHIV infection. This approach can now be evaluated in human clinical trials in AIDS lymphoma patients. In this patient setting, chemotherapy would not only kill malignant cells, but would also increase the number of MGMTP140K-expressing HIV-resistant cells. This approach should allow for high levels of HIV-protected cells in AIDS patients to evaluate AIDS gene therapy.
Background: The alpha-7 nicotinic acetylcholine receptor (alpha 7-nAChR) is well known as a potent calcium ionophore that, in the brain, has been implicated in excitotoxicity and hence in the underlying mechanisms of neurodegenerative disorders such as Alzheimer's disease. Previous research implied that the activity of this receptor may be modified by exposure to a peptide fragment derived from the C-terminal region of the enzyme acetylcholinesterase. This investigation was undertaken to determine if the functional changes observed could be attributed to peptide binding interaction with the alpha 7-nAChR, or peptide modulation of receptor expression. Methodology/Principal Findings: This study provides evidence that two peptides derived from the C-terminus of acetylcholinesterase, not only selectively displace specific bungarotoxin binding at the alpha 7-nAChR, but also alter receptor binding properties for its familiar ligands, including the alternative endogenous agonist choline. Of more long-term significance, these peptides also induce upregulation of alpha 7-nAChR mRNA and protein expression, as well as enhancing receptor trafficking to the plasma membrane. Conclusions/Significance: The results reported here demonstrate a hitherto unknown relationship between the alpha 7-nAChR and the non-enzymatic functions of acetylcholinesterase, mediated independently by its C-terminal domain. Such an interaction may prove valuable as a pharmacological tool, prompting new approaches for understanding, and combating, the process of neurodegeneration.
Background: The hemagglutinin (HA) glycoprotein is the principal target of protective humoral immune responses to influenza virus infections but such antibody responses only provide efficient protection against a narrow spectrum of HA antigenic variants within a given virus subtype. Avian influenza viruses such as H5N1 are currently panzootic and pose a pandemic threat. These viruses are antigenically diverse and protective strategies need to cross protect against diverse viral clades. Furthermore, there are 16 different HA subtypes and no certainty the next pandemic will be caused by an H5 subtype, thus it is important to develop prophylactic and therapeutic interventions that provide heterosubtypic protection. Methods and Findings: Here we describe a panel of 13 monoclonal antibodies (mAbs) recovered from combinatorial display libraries that were constructed from human IgM+ memory B cells of recent (seasonal) influenza vaccinees. The mAbs have broad heterosubtypic neutralizing activity against antigenically diverse H1, H2, H5, H6, H8 and H9 influenza subtypes. Restriction to variable heavy chain gene IGHV1-69 in the high affinity mAb panel was associated with binding to a conserved hydrophobic pocket in the stem domain of HA. The most potent antibody (CR6261) was protective in mice when given before and after lethal H5N1 or H1N1 challenge. Conclusions: The human monoclonal CR6261 described in this study could be developed for use as a broad spectrum agent for prophylaxis or treatment of human or avian influenza infections without prior strain characterization. Moreover, the CR6261 epitope could be applied in targeted vaccine strategies or in the design of novel antivirals. Finally our approach of screening the IgM+ memory repertoire could be applied to identify conserved and functionally relevant targets on other rapidly evolving pathogens.
Background: R-flurbiprofen, one of the enantiomers of flurbiprofen racemate, is inactive with respect to cyclooxygenase inhibition, but shows analgesic properties without relevant toxicity. Its mode of action is still unclear. Methodology/Principal Findings: We show that R-flurbiprofen reduces glutamate release in the dorsal horn of the spinal cord evoked by sciatic nerve injury and thereby alleviates pain in sciatic nerve injury models of neuropathic pain in rats and mice. This is mediated by restoring the balance of endocannabinoids (eCB), which is disturbed following peripheral nerve injury in the DRGs, spinal cord and forebrain. The imbalance results from transcriptional adaptations of fatty acid amide hydrolase (FAAH) and NAPE-phospholipase D, i.e. the major enzymes involved in anandamide metabolism and synthesis, respectively. R-flurbiprofen inhibits FAAH activity and normalizes NAPE-PLD expression. As a consequence, R-Flurbiprofen improves endogenous cannabinoid mediated effects, indicated by the reduction of glutamate release, increased activity of the anti-inflammatory transcription factor PPAR gamma and attenuation of microglia activation. Antinociceptive effects are lost by combined inhibition of CB1 and CB2 receptors and partially abolished in CB1 receptor deficient mice. R-flurbiprofen does however not cause changes of core body temperature which is a typical indicator of central effects of cannabinoid-1 receptor agonists. Conclusion: Our results suggest that R-flurbiprofen improves the endogenous mechanisms to regain stability after axonal injury and to fend off chronic neuropathic pain by modulating the endocannabinoid system and thus constitutes an attractive, novel therapeutic agent in the treatment of chronic, intractable pain.
Nerve injury leads to sensitization mechanisms in the peripheral and central nervous system which involve transcriptional and post-transcriptional modifications in sensory nerves. To assess protein regulations in the spinal cord after injury of the sciatic nerve in the Spared Nerve Injury model (SNI) we performed a proteomic analysis using 2D-difference gel electrophoresis (DIGE) technology. Among approximately 2300 protein spots separated on each gel we detected 55 significantly regulated proteins after SNI whereof 41 were successfully identified by MALDI-TOF MS. Out of the proteins which were regulated in the DIGE analyses after SNI we focused on the carboxypeptidase A inhibitor latexin because protease dysfunctions contribute to the development of neuropathic pain. Latexin protein expression was reduced after SNI which could be confirmed by Western Blot analysis, quantitative RT-PCR and in-situ hybridisation. The decrease of latexin was associated with an increase of the activity of carboxypeptidase A indicating that the balance between latexin and carboxypeptidase A was impaired in the spinal cord after peripheral nerve injury due to a loss of latexin expression in spinal cord neurons. This may contribute to the development of cold allodynia because normalization of neuronal latexin expression in the spinal cord by AAV-mediated latexin transduction or administration of a small molecule carboxypeptidase A inhibitor significantly reduced acetone-evoked nociceptive behavior after SNI. Our results show the usefulness of proteomics as a screening tool to identify novel mechanisms of nerve injury evoked hypernociception and suggest that carboxypeptidase A inhibition might be useful to reduce cold allodynia.
Background: The Radical-Pair-Model postulates that the reception of magnetic compass directions in birds is based on spin-chemical reactions in specialized photopigments in the eye, with cryptochromes discussed as candidate molecules. But so far, the exact subcellular characterization of these molecules in the retina remained unknown. Methodology/Principal Findings: We here describe the localization of cryptochrome 1a (Cry1a) in the retina of European robins, Erithacus rubecula, and domestic chickens, Gallus gallus, two species that have been shown to use the magnetic field for compass orientation. In both species, Cry1a is present exclusively in the ultraviolet/violet (UV/V) cones that are distributed across the entire retina. Electron microscopy shows Cry1a in ordered bands along the membrane discs of the outer segment, and cell fractionation reveals Cry1a in the membrane fraction, suggesting the possibility that Cry1a is anchored along membranes. Conclusions/Significance: We provide first structural evidence that Cry1a occurs within a sensory structure arranged in a way that fulfils essential requirements of the Radical-Pair-Model. Our findings, identifying the UV/V-cones as probable magnetoreceptors, support the assumption that Cry1a is indeed the receptor molecule mediating information on magnetic directions, and thus provide the Radical-Pair-Model with a profound histological background.
The cochlear implant (CI) represents, for almost 25 years now, the gold standard in the treatment of children born deaf and for postlingually deafened adults. These devices thus constitute the greatest success story in the field of ‘neurobionic’ prostheses. Their (now routine) fitting in adults, and especially in young children and even babies, places exacting demands on these implants, particularly with regard to the biocompatibility of a CI’s surface components. Furthermore, certain parts of the implant face considerable mechanical challenges, such as the need for the electrode array to be flexible and resistant to breakage, and for the implant casing to be able to withstand external forces. As these implants are in the immediate vicinity of the middle-ear mucosa and of the junction to the perilymph of the cochlea, the risk exists – at least in principle – that bacteria may spread along the electrode array into the cochlea. The wide-ranging requirements made of the CI in terms of biocompatibility and the electrode mechanism mean that there is still further scope – despite the fact that CIs are already technically highly sophisticated – for ongoing improvements to the properties of these implants and their constituent materials, thus enhancing the effectiveness of these devices. This paper will therefore discuss fundamental material aspects of CIs as well as the potential for their future development. Keywords: cochlear implant, biomaterials, biocompatibility, electrode, inner ear, cochleostomy, surface functionalization, drug delivery, nanoparticles, coating
Introduction: This study presents our online-teaching material within the k-MED project (Knowledge in Medical Education) at the university of Marburg. It is currently organized in five e-learning modules: cytogenetics, chromosomal aberrations, formal genetics, fundamentals of molecular diagnostics, and congenital abnormalities and syndromes. These are basic courses intended to do the educational groundwork, which will enable academic teachers to concentrate on more sophisticated topics during their lectures. Methods: The e-learning modules have been offered to a large group of about 3300 students during four years at the Faculty of Medicine in Marburg. The group consists of science students (human biology) and medical students in the preclinical or the clinical period, respectively. Participants were surveyed on acceptance by evaluating user-tracking data and questionnaires. Results and Conclusion: Analysis of the evaluation data proofs the broad acceptance of the e-learning modules during eight semesters. The courses are in stable or even increasing use from winter term 2005/06 until spring term 2009. Conclusion: Our e-learning-model is broadly accepted among students with different levels of knowledge at the Faculty of Medicine in Marburg. If the e-learning courses are maintained thoroughly, minor adaptations can increase acceptance and usage even furthermore. Their use should be extended to the medical education of technical assistances and nurses, who work in the field of human genetics. Keywords: Human genetics, e-Learning, evaluation, multimedia
Background: Due to the use of organophosphates (OP) as pesticides and the availability of OP-type nerve agents, an effective medical treatment for OP poisonings is still a challenging problem. The acute toxicity of an OP poisoning is mainly due to the inhibition of acetylcholinesterase (AChE) in the peripheral and central nervous systems (CNS). This results in an increase in the synaptic concentration of the neurotransmitter acetylcholine, overstimulation of cholinergic receptors and disorder of numerous body functions up to death. The standard treatment of OP poisoning includes a combination of a muscarinic antagonist and an AChE reactivator (oxime). However, these oximes can not cross the blood-brain barrier (BBB) sufficiently. Therefore, new strategies are needed to transport oximes over the BBB. Methodology/Principal Findings: In this study, we combined different oximes (obidoxime dichloride and two different HI 6 salts, HI 6 dichloride monohydrate and HI 6 dimethanesulfonate) with human serum albumin nanoparticles and could show an oxime transport over an in vitro BBB model. In general, the nanoparticulate transported oximes achieved a better reactivation of OP-inhibited AChE than free oximes. Conclusions/Significance: With these nanoparticles, for the first time, a tool exists that could enable a transport of oximes over the BBB. This is very important for survival after severe OP intoxication. Therefore, these nanoparticulate formulations are promising formulations for the treatment of the peripheral and the CNS after OP poisoning.
As important as the intrinsic properties of an individual nervous cell stands the network of neurons in which it is embedded and by virtue of which it acquires great part of its responsiveness and functionality. In this study we have explored how the topological properties and conduction delays of several classes of neural networks affect the capacity of their constituent cells to establish well-defined temporal relations among firing of their action potentials. This ability of a population of neurons to produce and maintain a millisecond-precise coordinated firing (either evoked by external stimuli or internally generated) is central to neural codes exploiting precise spike timing for the representation and communication of information. Our results, based on extensive simulations of conductance-based type of neurons in an oscillatory regime, indicate that only certain topologies of networks allow for a coordinated firing at a local and long-range scale simultaneously. Besides network architecture, axonal conduction delays are also observed to be another important factor in the generation of coherent spiking. We report that such communication latencies not only set the phase difference between the oscillatory activity of remote neural populations but determine whether the interconnected cells can set in any coherent firing at all. In this context, we have also investigated how the balance between the network synchronizing effects and the dispersive drift caused by inhomogeneities in natural firing frequencies across neurons is resolved. Finally, we show that the observed roles of conduction delays and frequency dispersion are not particular to canonical networks but experimentally measured anatomical networks such as the macaque cortical network can display the same type of behavior.
Mitochondrial complex I, the largest and most complicated proton pump of the respiratory chain, links the electron transfer from NADH to ubiquinone to the pumping of four protons from the matrix into the intermembrane space. In humans, defects in complex I are involved in a wide range of degenerative disorders. Recent progress in the X-ray structural analysis of prokaryotic and eukaryotic complex I confirmed that the redox reactions are confined entirely to the hydrophilic peripheral arm of the L-shaped molecule and take place at a remarkable distance from the membrane domain. While this clearly implies that the proton pumping within the membrane arm of complex I is driven indirectly via long-range conformational coupling, the molecular mechanism and the number, identity, and localization of the pump-sites remains unclear. Here, we report that upon deletion of the gene for a small accessory subunit of the Yarrowia complex I, a stable subcomplex (nb8m delta) is formed that lacks the distal part of the membrane domain as revealed by single particle analysis. The analysis of the subunit composition of holo and subcomplex by three complementary proteomic approaches revealed that two (ND4 and ND5) of the three subunits with homology to bacterial Mrp-type Na+/H+ antiporters that have been discussed as prime candidates for harbouring the proton pumps were missing in nb8m delta. Nevertheless, nb8m delta still pumps protons at half the stoichiometry of the complete enzyme. Our results provide evidence that the membrane arm of complex I harbours two functionally distinct pump modules that are connected in series by the long helical transmission element recently identified by X-ray structural analysis.
Channelrhodopsin-2 (ChR2) is widely used for rapid photodepolarization of neurons, yet, as it requires high-intensity blue light for activation, it is not suited for long-term in vivo applications, e.g. for manipulations of behavior, or photoactivation of neurons during development. We used “slow” ChR2 variants with mutations in the C128 residue, that exhibit delayed off-kinetics and increased light sensitivity in Caenorhabditis elegans. Following a 1 s light pulse, we could photodepolarize neurons and muscles for minutes (and with repeated brief stimulation, up to days) with low-intensity light. Photoactivation of ChR2(C128S) in command interneurons elicited long-lasting alterations in locomotion. Finally, we could optically induce profound changes in animal development: Long-term photoactivation of ASJ neurons, which regulate larval growth, bypassed the constitutive entry into the “dauer” larval state in daf-11 mutants. These lack a guanylyl cyclase, which possibly renders ASJ neurons hyperpolarized. Furthermore, photostimulated ASJ neurons could acutely trigger dauer-exit. Thus, slow ChR2s can be employed to long-term photoactivate behavior and to trigger alternative animal development.
Effect sizes in experimental pain produced by gender, genetic variants and sensitization procedures
(2011)
Background: Various effects on pain have been reported with respect to their statistical significance, but a standardized measure of effect size has been rarely added. Such a measure would ease comparison of the magnitude of the effects across studies, for example the effect of gender on heat pain with the effect of a genetic variant on pressure pain. Methodology/Principal Findings: Effect sizes on pain thresholds to stimuli consisting of heat, cold, blunt pressure, punctuate pressure and electrical current, administered to 125 subjects, were analyzed for 29 common variants in eight human genes reportedly modulating pain, gender and sensitization procedures using capsaicin or menthol. The genotype explained 0–5.9% of the total interindividual variance in pain thresholds to various stimuli and produced mainly small effects (Cohen's d 0–1.8). The largest effect had the TRPA1 rs13255063T/rs11988795G haplotype explaining >5% of the variance in electrical pain thresholds and conferring lower pain sensitivity to homozygous carriers. Gender produced larger effect sizes than most variant alleles (1–14.8% explained variance, Cohen's d 0.2–0.8), with higher pain sensitivity in women than in men. Sensitization by capsaicin or menthol explained up to 63% of the total variance (4.7–62.8%) and produced largest effects according to Cohen's d (0.4–2.6), especially heat sensitization by capsaicin (Cohen's d = 2.6). Conclusions: Sensitization, gender and genetic variants produce effects on pain in the mentioned order of effect sizes. The present report may provide a basis for comparative discussions of factors influencing pain.
Based on Foucault’s analysis of German Neoliberalism and his thesis of ambiguity, the following paper draws a two-level distinction between individual and regulatory ethics. The individual ethics level – which has received surprisingly little attention – contains the Christian foundation of values and the liberal-Kantian heritage of so called Ordoliberalism – as one variety of neoliberalism. The regulatory or formal-institutional ethics level on the contrary refers to the ordoliberal framework of a socio-economic order. By differentiating these two levels of ethics incorporated in German Neoliberalism, it is feasible to distinguish dissimilar varieties of neoliberalism and to link Ordoliberalism to modern economic ethics. Furthermore, it allows a revision of the dominant reception of Ordoliberalism which focuses solely on the formal-institutional level while mainly neglecting the individual ethics level.
Background: Microvolt T-wave alternans (MTWA) testing in many studies has proven to be a highly accurate predictor of ventricular tachyarrhythmic events (VTEs) in patients with risk factors for sudden cardiac death (SCD) but without a prior history of sustained VTEs (primary prevention patients). In some recent studies involving primary prevention patients with prophylactically implanted cardioverter-defibrillators (ICDs), MTWA has not performed as well.
Objective: This study examined the hypothesis that MTWA is an accurate predictor of VTEs in primary prevention patients without implanted ICDs, but not of appropriate ICD therapy in such patients with implanted ICDs.
Methods: This study identified prospective clinical trials evaluating MTWA measured using the spectral analytic method in primary prevention populations and analyzed studies in which: (1) few patients had implanted ICDs and as a result none or a small fraction (≤15%) of the reported end point VTEs were appropriate ICD therapies (low ICD group), or (2) many of the patients had implanted ICDs and the majority of the reported end point VTEs were appropriate ICD therapies (high ICD group).
Results: In the low ICD group comprising 3,682 patients, the hazard ratio associated with a nonnegative versus negative MTWA test was 13.6 (95% confidence interval [CI] 8.5 to 30.4) and the annual event rate among the MTWA-negative patients was 0.3% (95% CI: 0.1% to 0.5%). In contrast, in the high ICD group comprising 2,234 patients, the hazard ratio was only 1.6 (95% CI: 1.2 to 2.1) and the annual event rate among the MTWA-negative patients was elevated to 5.4% (95% CI: 4.1% to 6.7%). In support of these findings, we analyzed published data from the Multicenter Automatic Defibrillator Trial II (MADIT II) and Sudden Cardiac Death in Heart Failure Trial (SCD-HeFT) trials and determined that in those trials only 32% of patients who received appropriate ICD therapy averted an SCD.
Conclusion: This study found that MTWA testing using the spectral analytic method provides an accurate means of predicting VTEs in primary prevention patients without implanted ICDs; in particular, the event rate is very low among such patients with a negative MTWA test. In prospective trials of ICD therapy, the number of patients receiving appropriate ICD therapy greatly exceeds the number of patients who avert SCD as a result of ICD therapy. In trials involving patients with implanted ICDs, these excess appropriate ICD therapies seem to distribute randomly between MTWA-negative and MTWA-nonnegative patients, obscuring the predictive accuracy of MTWA for SCD. Appropriate ICD therapy is an unreliable surrogate end point for SCD.
Background: Endothelin-1 signalling plays an important role in pathogenesis of pulmonary hypertension. Although different endothelin-A receptor antagonists are developed, a novel therapeutic option to cure the disease is still needed. This study aims to investigate the therapeutic efficacy of the selective endothelin-A receptor antagonist TBC3711 in monocrotaline-induced pulmonary hypertension in rats.
Methods: Monocrotaline-injected male Sprague-Dawley rats were randomized and treated orally from day 21 to 35 either with TBC3711 (Dose: 30 mg/kg body weight/day) or placebo. Echocardiographic measurements of different hemodynamic and right-heart hypertrophy parameters were performed. After day 35, rats were sacrificed for invasive hemodynamic and right-heart hypertrophy measurements. Additionally, histologic assessment of pulmonary vascular and right-heart remodelling was performed.
Results: The novel endothelin-A receptor antagonist TBC3711 significantly attenuated monocrotaline-induced pulmonary hypertension, as evident from improved hemodynamics and right-heart hypertrophy in comparison with placebo group. In addition, muscularization and medial wall thickness of distal pulmonary vessels were ameliorated. The histologic evaluation of the right ventricle showed a significant reduction in fibrosis and cardiomyocyte size, suggesting an improvement in right-heart remodelling.
Conclusion: The results of this study suggest that the selective endothelin-A receptor antagonist TBC3711 demonstrates therapeutic benefit in rats with established pulmonary hypertension, thus representing a useful therapeutic approach for treatment of pulmonary hypertension.
Background: Chemotherapy of glioblastoma is largely ineffective as the blood-brain barrier (BBB) prevents entry of most anticancer agents into the brain. For an efficient treatment of glioblastomas it is necessary to deliver anti-cancer drugs across the intact BBB. Poly(lactic-co-glycolic acid) (PLGA) nanoparticles coated with poloxamer 188 hold great promise as drug carriers for brain delivery after their intravenous injection. In the present study the anti-tumour efficacy of the surfactant-coated doxorubicin-loaded PLGA nanoparticles against rat glioblastoma 101/8 was investigated using histological and immunohistochemical methods. Methodology: The particles were prepared by a high-pressure solvent evaporation technique using 1% polyvinylalcohol (PLGA/PVA) or human serum albumin (PLGA/HSA) as stabilizers. Additionally, lecithin-containing PLGA/HSA particles (Dox-Lecithin-PLGA/HSA) were prepared. For evaluation of the antitumour efficacy the glioblastoma-bearing rats were treated intravenously with the doxorubicin-loaded nanoparticles coated with poloxamer 188 using the following treatment regimen: 3×2.5 mg/kg on day 2, 5 and 8 after tumour implantation; doxorubicin and poloxamer 188 solutions were used as controls. On day 18, the rats were sacrificed and the antitumour effect was determined by measurement of tumour size, necrotic areas, proliferation index, and expression of GFAP and VEGF as well as Isolectin B4, a marker for the vessel density. Conclusion: The results reveal a considerable anti-tumour effect of the doxorubicin-loaded nanoparticles. The overall best results were observed for Dox-Lecithin-PLGA/HSA. These data demonstrate that the poloxamer 188-coated PLGA nanoparticles enable delivery of doxorubicin across the blood-brain barrier in the therapeutically effective concentrations.
PAX2 regulates ADAM10 expression and mediates anchorage-independent cell growth of melanoma cells
(2011)
PAX transcription factors play an important role during development and carcinogenesis. In this study, we investigated PAX2 protein levels in melanocytes and melanoma cells by Western Blot and immunofluorescence analysis and characterized the role of PAX2 in the pathogenesis of melanoma. In vitro we found weak PAX2 protein expression in keratinocytes and melanocytes. Compared to melanocytes increased PAX2 protein levels were detectable in melanoma cell lines. Interestingly, in tissue sections of melanoma patients nuclear PAX2 expression strongly correlated with nuclear atypia and the degree of prominent nucleoli, indicating an association of PAX2 with a more atypical cellular phenotype. In addition, with chromatin immunoprecipitation assay, PAX2 overexpression and PAX2 siRNA we present compelling evidence that PAX2 can regulate ADAM10 expression, a metalloproteinase known to play important roles in melanoma metastasis. In human tissue samples we found co-expression of PAX2 and ADAM10 in melanocytes of benign nevi and in melanoma cells of patients with malignant melanoma. Importantly, the downregulation of PAX2 by specific siRNA inhibited the anchorage independent cell growth and decreased the migratory and invasive capacity of melanoma cells. Furthermore, the downregulation of PAX2 abrogated the chemoresistance of melanoma cells against cisplatin, indicating that PAX2 expression mediates cell survival and plays important roles during melanoma progression.
The indications for allogeneic stem cell transplantation (SCT) in Acute Myeloid Leukemia (AML) represent a real challenge due to the clinical and genetic heterogeneity of the disorder. Therefore, an optimized indication for SCT in AML first requires the determination of the individual relapse risk based on diverse chromosomal and molecular prognosis-defining aberrations. A broad panel of diagnostic methods is needed to allow such subclassification and prognostic stratification: cytomorphology, cytogenetics, molecular genetics, and immunophenotyping by multiparameter flow cytometry. These methods should not be seen as isolated techniques but as parts of an integral network with hierarchies and interactions. Examples for a poor risk constellation as a clear indication for allogeneic SCT are provided by anomalies of chromosome 7, complex aberrations, or FLT3-length mutations. In contrast, the favorable reciprocal translocations such as the t(15;17)/PML-RARA or t(8;21)/AML1-ETO are not indications for SCT in first remission due to the rather good prognosis after standard therapy. Further, the indication for SCT should include the results of minimal residual disease (MRD) diagnostics by polymerase chain reaction (PCR) or flow cytometry. New aspects for a safe and fast risk stratification as basis for an optimized indication for SCT in AML might be provided by novel technologies such as microarray-based gene expression profiling. Keywords: Acute Myeloid Leukemia (AML), Allogeneic Stem Cell Transplantation (SCT), Indication, Cytogenetics, Polymerase Chain Reaction (PCR)
In dyadic communication, both interlocutors adapt to each other linguistically, that is, they align interpersonally. In this article, we develop a framework for modeling interpersonal alignment in terms of the structural similarity of the interlocutors’ dialog lexica. This is done by means of so-called two-layer time-aligned network series, that is, a time-adjusted graph model. The graph model is partitioned into two layers, so that the interlocutors’ lexica are captured as subgraphs of an encompassing dialog graph. Each constituent network of the series is updated utterance-wise. Thus, both the inherent bipartition of dyadic conversations and their gradual development are modeled. The notion of alignment is then operationalized within a quantitative model of structure formation based on the mutual information of the subgraphs that represent the interlocutor’s dialog lexica. By adapting and further developing several models of complex network theory, we show that dialog lexica evolve as a novel class of graphs that have not been considered before in the area of complex (linguistic) networks. Additionally, we show that our framework allows for classifying dialogs according to their alignment status. To the best of our knowledge, this is the first approach to measuring alignment in communication that explores the similarities of graph-like cognitive representations. Keywords: alignment in communication; structural coupling; linguistic networks; graph distance measures; mutual information of graphs; quantitative network analysis
The Dagstuhl Perspectives Workshop "Online Privacy: Towards Informational Self-Determination on the Internet" (11061) has been held in February 6-11, 2011 at Schloss Dagstuhl. 30 participants from academia, public sector, and industry have identified the current status-of-the-art of and challenges for online privacy as well as derived recommendations for improving online privacy. Whereas the Dagstuhl Manifesto of this workshop concludes the results of the working groups and panel discussions, this article presents the talks of this workshop by their abstracts.
The article discusses current transformations in the education systems worldwide. Focusing on the European Union (EU) and the Organisation for Economic Cooperation and Development (OECD) as policy actors, it argues that these transformations imply a triple economization of education policy which can be observed at all levels of the education sector. The increasing importance of these organizations in educational issues marks a transition to a "postnational constellation" also in the education field insofar as the national educational sovereignty is being at least readjusted. The economization of education policy is however not restricted to bringing education closer to the needs of the economy and to turning its services into tradable goods. Rather, it also impinges on the operative level of education. A logics of production is being implemented in the self-description of the institutions of the education system, which are no longer bureaucratically administered establishments, but are rather conceived of as managerially conducted production business in which entrepreneurial action is needed. This new governance raises the problem of democratic legitimation of political decisions which ideally combines three elements: democratic, expertocratic, and ethico-professional. The article discusses the consequences of a shift in the balance of the three components with reference to Germany.
In this work we present a study of the influence of nucleus initializations on the event-by-event elliptic flow coefficient, v2. In most Monte-Carlo models, the initial positions of the nucleons in a nucleus are completely uncorrelated, which can lead to very high density regions. In a simple, yet more realistic model where overlapping of the nucleons is avoided, fluctuations in the initial conditions are reduced. However, v2 distributions are not very sensitive to the initialization choice.
Nusa Tenggara Timor, a south-eastern province of Indonesia, is populated mainly by Christians. The Alor-Pantar Archipelago has a majority of Protestant inhabitants who were baptized by Dutch Calvinists in the first half of the twentieth century. In addition, there are some coastal enclaves that have been inhabited by Muslims for centuries. In some areas, such as in the headland of Muna (Tanjung Muna) forming the northeast of Pantar Island, there is an even greater diversity of monotheistic religions, with some Catholic families living next to Protestants and Muslims. All adherers of the three religious faiths living at Tanjung Muna share core elements of the local adat, which consists of core rules relating to social behavior. It is believed that the ancestors will notice transgressions of these rules, and may use their supernatural power to punish their human descendants. In Indonesia, the term adat was first used by Muslims to distinguish the non-Islamic practices from Muslim faith (Keane 1997:260-261). This is definitely not the case in the village of Pandai at the coast of Tanjung Muna, where Islam tolerates ancestral worship. The same is true for the Catholics in the inland village of Helangdohi, who do not only tolerate but even support such customs. Some villagers from Helangdohi had become acquainted with this kind of Catholicism on the nearby island of Flores, where ancestral worship is encouraged by the missionaries of the Societas Verbi Divini (SVD). The attitude of Protestantism, at least in the Alor Archipelago, is quite the contrary of the permissive views held by Catholicism and Islam. In the 1930s the Protestant-Calvinist missionaries banned any kind of ancestral worship and destroyed most relics (Dalen 1928: Picture 1). These drastic measures demanded the disavowal of the ancestors, including the destruction of heirlooms and omitting of rituals.
The enzyme quinol:fumarate reductase (QFR) from the anaerobic epsilon-proteobacterium Wolinella succinogenes is a membrane protein complex that couples the catalysis of the oxidation of menaquinol to menaquinone to that of the reduction of fumarate to succinate. This is the terminal step in fumarate respiration, a form of anaerobic respiration in which oxygen is replaced by fumarate as the terminal electron acceptor in many anaerobic microorganisms. In QFR, both the heme groups (low-potential distal and high-potential proximal heme b group in transmembrane subunit C) are part of the electron transport chain between the two catalytic sites of the redox enzyme. Although the reduction of fumarate by menaquinol is exergonic, it is not exergonic enough to support the generation of a transmembrane electrochemical proton potential delta p. Evidence has previously shown that this reaction is catalysed by a novel mechanism, involving the facilitation of transmembrane electron transfer by transmembrane proton transfer via an essential compensatory transmembrane proton transfer pathway ("E-pathway") which is inactive in the oxidized state of the enzyme. The two key constitutents of the the pathway are the amino acid residue Glu C180 of the transmembrane helix V (located in subunit C) and the ring C propionate of the distal heme bD. The aim of the project was to obtain, by employing a combination of time-resolved as well as static spectroscopic approaches, a detailed insight of the transmembrane electron coupled proton transfer mechanism. Minute changes in both the oxidized and reduced states of a redox protein system can be selectively and sensitively monitored by static Fourier Transformed Infrared (FTIR) difference spectroscopy. The technique employed in this context, electrochemically induced FTIR difference spectroscopy, is complemented by computer-based electrostatic calculations. In order to elucidate the catalytic mechanism of the important reactions in QFR, it is necessary to investigate these in a time-resolved manner. Rapid scan FTIR difference spectroscopy is a suitable technique that allows the course of the reaction to be monitored in a time dependent fashion. The techniques employed in this context are time-resolved (tr-FTIR) and transient absorption spectroscopy. In the following, the details of individual sub-projects are discussed in brief. ...
The ubiquinol:cytochrome c oxidoreductase is a key component of several aerobic respiratory chains in different organisms. It is an integral membrane protein complex, made up of three catalytic subunits (cytochrome b, cytochrome c1 and Rieske iron sulphur protein) and up to eight additional subunits in mitochondria. The complex oxidizes one quinol molecules and reduces two cytochrome c during the Q cycle, originally described by Peter Mitchell. Electrons are split between the low and the high potential chain and protons are released on the positive side of the membrane, increasing the protonmotive force needed by the ATP-synthase for energy transduction. The cytochrome bc1 complex from P. denitrificans is a perfect model for structural and functional studies. Bacteria are easy to grow and the genetic material is readily accessible for genetic manipulation. Moreover, the P. denitrificans aerobic respiratory chain is very close to the mitochondrial one: the complexes involved in electron transfer resemble the ones found in mitochondria, but lack most of the additional subunits. As a unique feature, P. denitrificans has a strongly acidic domain at the N-terminal region of the cytochrome c1, a sequence of 150 aminoacids which does not correlate with any known protein. An analogous composition can be found in the eukaryotic cytochrome bc1 complex as a part of an accessory subunit, proposed to be involved in facilitating electron transfer between the complex and the electron acceptor cytochrome c. In order to study the function of this domain in the P. denitrificans cytochrome bc1 complex, a deletion mutant has been previously cloned and modified with an affinity tag as a C-terminal extension of cytochrome b. The complex is purified by affinity chromatography and characterized by steady-state kinetics using not only horse heart cytochrome c but also the endogenous electron acceptor, the membrane bound cytochrome c552, employed here as a soluble fragment. Steady–state kinetics indicate that the deletion of the long acidic domain had effects neither on the turnover rate nor on the apparent affinity for the substrate. To understand wether the deletion affects the reaction between the cytochrome bc1 complex and the substrate, laser flash photolysis experiments are performed, showing that the interaction observed was not changed in the complex missing the acidic domain. The results presented in this work confirm the ones previously obtained by Julia Janzon using soluble fragments of the same interaction partners. The deletion, however, affected the oligomerization state of the complex, as shown by LILBID (Laser Induced Liquid Bead Ion Desorption) analysis. The wild type complex has a tetrameric structure, better described as a “dimer of dimers”. The deletion of the acidic domain on the cytochrome c1 results in the separation of the two dimers, yielding the canonical dimer. Therefore, the complex deleted in the acidic domain is used for cloning and expression of a heterodimeric complex, containing an inactivating mutation in the quinol oxidation site in only one monomer, thus allowing a selective switch-off for half the complex. Such a complex is needed for the verification of an internal regulation mechanism, the half-of-the-sites reactivity. According to it, the dimeric structure of the cytochrome bc1 complex has functional implications, since the two monomers can communicate and work in a coordinated manner. This approach confirms that substrate oxidation does effectively take place only in one of the two monomers constituting the dimer, and that the binding of substrate at the Qo and Qi site regulates the switch between active and inactive monomer. Moreover, this mechanism works also as an effective protection against the reaction of quinone intermediates with oxygen and the formation of reactive oxygen species (ROS), responsable for cellular aging. The motion of the ISP head domain is also addressed in this work; in particular the mechanism which regulates the movements towards the cytochrome c1 and the electron bifurcation at the quinol oxidation site. Laser flash kinetics in presence of several inhibitors and the substrate allow studying the response of the ISP to the binding of different species at the quinol oxidation site. The binding of ligand at the Qo site in the complex triggers the conformational switch in the ISP head domain, supporting the mechanism proposed in the literature according to which the Qo site is able to “sense” the presence of substrate and transfer the information to the ISP, regulating its mobility. The internal electron pathway between the ISP and the cytochrome c1 has been analyzed also by stopped-flow kinetics, in presence and absence of inhibitors. The results indicate that two kinetic phases describe the reduction of cytochrome c1 by the ISP, and a model for the simulation of the data is proposed.
Dynamics of chaotic strings
(2011)
The main topic of this thesis is the investigation of dynamical properties of coupled Tchebycheff map networks. At every node of the network the dynamics is given by the iteration of a Tchebycheff map, which shows strongest possible chaotic behaviour. By applying a coupling between the various individual dynamics along the links of the network, a rich structure of complex dynamical patterns emerges. Accordingly, coupled chaotic map networks provide prototypical models for studying the interplay between local dynamics, network structure, and the emergent global dynamics. An exciting application of coupled Tchebycheff map lattices in quantum field theory has been proposed Beck in Spatio-temporal chaos and vacuum fluctuations of quantized fields' (2002). In this so-called chaotic string model, the coupled map lattice dynamics generates the noise needed for the Parisi-Wu approach of stochastic quantization. The remarkable obversation is that the respective dynamics seems to reproduce distinguished numerical values of coupling constants that coincide with those observed in the standard model of particle physic. The results of this thesis give insights into the chaotic string model and its network generalization from a dynamical point of view. This leads to a deeper understanding of the dynamics, which is essential for a critical discussion of possible physical embeddings. Apart from this specific application to particle physics, the investigated concepts like synchronization or a most random behaviour of the dynamics are of general interest for dynamical system theory and the science of complex networks. As a first approach, discrete symmetry transformations of the model are studied. These transformations are formulated in a general way in order to be also applicable to similar dynamics on bipartite network structures. An observable of main interest in the chaotic string model is the interaction energy. In Spatio-temporal chaos and vacuum fluctuations of quantized fields' (2002) it has been observed that certain chaotic string couplings, corresponding to a vanishing interaction energy, coincide with coupling constants of the standard model of elementary particle physics. Since the interaction energy is basically a spatial correlation measure, an interpretation of the respective dynamical states in terms of a most random behaviour is tempting. In order to distinguish certain states as most random', or evoke another dynamical principle, a deeper understanding of the dynamics essential. In the present thesis the dynamics is studied numerically via Lyapunov measures, spatial correlations, and ergodic properties. It is shown that the zeros of the interaction energy are distinguished only with respect to this specific observable, but not by a more general dynamical principle. The original chaotic string model is defined on a one-dimensional lattice (ring-network) as the underlying network topology. This thesis studies a modification of the model based on the introduction of tunable disorder. The effects of inhomogeneous coupling weights as well as small-world perturbations of the ring-network structure on the interaction energy are discussed. Synchronization properties of the chaotic string model and its network generalization are studied in later chapters of this thesis. The analysis is based on the master stability formalism, which relates the stability of the synchronized state to the spectral properties of the network. Apart from complete synchronization, where the dynamics at all nodes of the network coincide, also two-cluster synchronization on bipartite networks is studied. For both types of synchronization it is shown that depending on the type of coupling the synchronized dynamics can display chaotic as well as periodic or quasi-periodic behaviour. The semi-analytical calculations reveal that the respective synchronized states are often stable for a wide range of coupling values even for the ring-network, although the respective basins of attraction may inhabit only a small fraction of the phase space. To provide analytical results in closed form, for complete synchronization the stability of all fixed points and period-2 orbits of all chaotic string networks are determined analytically. The master stability formalism allows to treat the ring-network of the chaotic string model as a special case, but the results are valid for coupled Tchebycheff maps on arbitrary networks. For two-cluster synchronization on bipartite networks, selected fixed points and period-2 orbits are analyzed.
Structured RNA regions are important gene control elements in prokaryotes and eukaryotes. Here, we show that the mRNA of a cyanobacterial heat shock gene contains a built-in thermosensor critical for photosynthetic activity under stress conditions. The exceptionally short 5´-untranslated region is comprised of a single hairpin with an internal asymmetric loop. It inhibits translation of the Synechocystis hsp17 transcript at normal growth conditions, permits translation initiation under stress conditions and shuts down Hsp17 production in the recovery phase. Point mutations that stabilized or destabilized the RNA structure deregulated reporter gene expression in vivo and ribosome binding in vitro. Introduction of such point mutations into the Synechocystis genome produced severe phenotypic defects. Reversible formation of the open and closed structure was beneficial for viability, integrity of the photosystem and oxygen evolution. Continuous production of Hsp17 was detrimental when the stress declined indicating that shutting-off heat shock protein production is an important, previously unrecognized function of RNA thermometers. We discovered a simple biosensor that strictly adjusts the cellular level of a molecular chaperone to the physiological need.
The p53-family member p73 plays a role in various cellular signaling pathways during development and growth control and it can have tumor suppressor properties. Several isoforms of p73 exist with considerable differences in their function. Whereas the functions of the N-terminal isoforms (TA and delta Np73) and their opposing pro- and antiapoptotic roles have become evident, the functional differences of the distinct C-terminal splice forms of TAp73 have remained unclear. Here, we characterized the global genomic binding sites for TAp73alpha and TAp73beta by chromatin immunoprecipitation sequencing as well as the transcriptional responses by performing RNA sequencing. We identified a specific p73 consensus binding motif and found a strong enrichment of AP1 motifs in close proximity to binding sites for TAp73alpha. These AP1 motif-containing target genes are selectively upregulated by TAp73alpha, while their mRNA expression is repressed upon TAp73beta induction. We show that their expression is dependent on endogenous c-Jun and that recruitment of c-Jun to the respective AP1 sites was impaired upon TAp73beta expression, in part due to downregulation of c-Jun. Several of these AP1-site containing TAp73alpha-induced genes impinge on apoptosis induction, suggesting an underlying molecular mechanism for the observed functional differences between TAp73alpha and TAp73beta.
The mfl-riboswitch regulates expression of ribonucleotide reductase subunit in Mesoplasma florum by binding to 2´-deoxyguanosine and thereby promoting transcription termination. We characterized the structure of the ligand-bound aptamer domain by NMR spectroscopy and compared the mfl-aptamer to the aptamer domain of the closely related purine-sensing riboswitches. We show that the mfl-aptamer accommodates the extra 2´-deoxyribose unit of the ligand by forming a more relaxed binding pocket than these found in the purine-sensing riboswitches. Tertiary structures of the xpt-aptamer bound to guanine and of the mfl-aptamer bound to 2´-deoxyguanosine exhibit very similar features, although the sequence of the mfl-aptamer contains several alterations compared to the purine-aptamer consensus sequence. These alterations include the truncation of a hairpin loop which is crucial for complex formation in all purine-sensing riboswitches characterized to date. We further defined structural features and ligand binding requirements of the free mfl-aptamer and found that the presence of Mg2+ is not essential for complex formation, but facilitates ligand binding by promoting pre-organization of key structural motifs in the free aptamer.
RNA thermometers are translational control elements that regulate the expression of bacterial heat shock and virulence genes. They fold into complex secondary structures that block translation at low temperatures. A temperature increase releases the ribosome binding site and thus permits translation initiation. In fourU-type RNA thermometers, the AGGA sequence of the SD region is paired with four consecutive uridines. We investigated the melting points of the wild-type and mutant sequences. It was decreased by 5°C when a stabilizing GC basepair was exchanged by an AU pair or increased by 11°C when an internal AG mismatch was converted to a GC pair, respectively. Stabilized or destabilized RNA structures are directly correlated with decreased or increased in vivo gene expression, respectively. Mg2+ also affected the melting point of the fourU thermometer. Variations of the Mg2+ concentration in the physiological range between 1 and 2 mM translated into a 2.8°C shift of the melting point. Thus, Mg2+ binding to the hairpin RNA is regulatory relevant. Applying three different NMR techniques, two Mg2+ binding sites were found in the hairpin structure. One of these binding sites could be identified as outer sphere binding site that is located within the fourU motif. Binding of the two Mg2+ ions exhibits a positive cooperativity with a Hill coefficient of 1.47. Free energy values delta G for Mg2+ binding determined by NMR are in agreement with data determined from CD measurements. Physiological Mg2+ concentrations reduce enthalpy and entropy values of uncorrelated base pair opening processes for almost all nucleobases.
The plastids of cryptophytes, haptophytes, and heterokontophytes (stramenopiles) (together once known as chromists) are surrounded by four membranes, reflecting the origin of these plastids through secondary endosymbiosis. They share this trait with apicomplexans, which are alveolates, the plastids of which have been suggested to stem from the same secondary symbiotic event and therefore form a phylogenetic clade, the chromalveolates. The chromists are quantitatively the most important eukaryotic contributors to primary production in marine ecosystems. The mechanisms of protein import across their four plastid membranes are still poorly understood. Components of an endoplasmic reticulum-associated degradation (ERAD) machinery in cryptophytes, partially encoded by the reduced genome of the secondary symbiont (the nucleomorph), are implicated in protein transport across the second outermost plastid membrane. Here, we show that the haptophyte Emiliania huxleyi, like cryptophytes, stramenopiles, and apicomplexans, possesses a nuclear-encoded symbiont-specific ERAD machinery (SELMA, symbiont-specific ERAD-like machinery) in addition to the host ERAD system, with targeting signals that are able to direct green fluorescent protein or yellow fluorescent protein to the predicted cellular localization in transformed cells of the stramenopile Phaeodactylum tricornutum. Phylogenies of the duplicated ERAD factors reveal that all SELMA components trace back to a red algal origin. In contrast, the host copies of cryptophytes and haptophytes associate with the green lineage to the exclusion of stramenopiles and alveolates. Although all chromalveolates with four membrane-bound plastids possess the SELMA system, this has apparently not arisen in a single endosymbiotic event. Thus, our data do not support the chromalveolate hypothesis. Key words: Emiliania huxleyi, secondary endosymbiosis, chromalveolate, hypothesis, complex plastid, plastid protein import, algal evolution
Extending the carotenoid pathway to astaxanthin in plants is of scientific and industrial interest. However, expression of a microbial beta-carotene ketolase (BKT) that catalyses the formation of ketocarotenoids in transgenic plants typically results in low levels of astaxanthin. The low efficiency of BKTs in ketolating zeaxanthin to astaxanthin is proposed to be the major limitation for astaxanthin accumulation in engineered plants. To verify this hypothesis, several algal BKTs were functionally characterized using an Escherichia coli system and three BKTs were identified, with high (up to 85%), moderate (~38%), and low (~1%) conversion rate from zeaxanthin to astaxanthin from Chlamydomonas reinhardtii (CrBKT), Chlorella zofingiensis (CzBKT), and Haematococcus pluvialis (HpBKT3), respectively. Transgenic Arabidopsis thaliana expressing the CrBKT developed orange leaves which accumulated astaxanthin up to 2 mg g -1 dry weight with a 1.8-fold increase in total carotenoids. In contrast, the expression of CzBKT resulted in much lower astaxanthin content (0.24 mg g -1 dry weight), whereas HpBKT3 was unable to mediate synthesis of astaxanthin in A. thaliana. The none-native astaxanthin was found mostly in a free form integrated into the light-harvesting complexes of photosystem II in young leaves but in esterified forms in senescent leaves. The alteration of carotenoids did not affect chlorophyll content, plant growth, or development significantly. The astaxanthin-producing plants were more tolerant to high light as shown by reduced lipid peroxidation. This study advances a decisive step towards the utilization of plants for the production of high-value astaxanthin. Keywords: Arabidopsis thaliana, astaxanthin, beta-carotene ketolase, carotenoid, Haematococcus pluvialis
Background: Multiple sclerosis (MS) is a chronic, inflammatory demyelinating disease of the central nervous system, believed to be triggered by an autoimmune reaction to myelin. Recently, a fundamentally different pathomechanism termed ‘chronic cerebrospinal venous insufficiency’ (CCSVI) was proposed, provoking significant attention in the media and scientific community.
Methods: Twenty MS patients (mean age 42.2±13.3 years; median Extended Disability Status Scale 3.0, range 0–6.5) were compared with 20 healthy controls. Extra- and intracranial venous flow direction was assessed by colour-coded duplex sonography, and extracranial venous cross-sectional area (VCSA) of the internal jugular and vertebral veins (IJV/VV) was measured in B-mode to assess the five previously proposed CCSVI criteria. IJV-VCSA≤0.3 cm2 indicated ‘stenosis,’ and IJV-VCSA decrease from supine to upright position ‘reverted postural control.’ The sonographer, data analyser and statistician were blinded to the patient/control status of the participants.
Results: No participant showed retrograde flow of cervical or intracranial veins. IJV-VCSA≤0.3 cm2 was found in 13 MS patients versus 16 controls (p=0.48). A decrease in IJV-VCSA from supine to upright position was observed in all participants, but this denotes a physiological finding. No MS patient and one control had undetectable IJV flow despite deep inspiration (p=0.49). Only one healthy control and no MS patients fulfilled at least two criteria for CCSVI.
Conclusions: This triple-blinded extra- and transcranial duplex sonographic assessment of cervical and cerebral veins does not provide supportive evidence for the presence of CCSVI in MS patients. The findings cast serious doubt on the concept of CCSVI in MS.
Pulsed electron-electron double resonance (PELDOR) is a pulsed EPR method that can reliably and precisely provide structural information regarding duplex RNAs and DNAs by measuring long-range distances (1.5-7 nm) utilizing distance-dependent magnetic dipole-dipole interaction between two nitroxide spin labels. In this thesis the application field of PELDOR spectroscopy has been expanded. For the first time the global architecture of tertiary folded RNA has been mapped in vitro. Moreover, the first application of PELDOR for determining structural aspects of RNA and DNA molecules inside cells has been presented. RNA has the central role in cellular processes and gene regulation. It can adopt complex three dimensional structures, which in combination with its conformational dynamics is essential for its function as biological catalyst, structural scaffold and regulator of gene expression. Riboswitches are cis-acting RNA segments that modulate gene expression by direct binding of small molecules with high affinity and specificity. Neomycin-responsive riboswitch is an engineered riboswitch developed by combination of in vitro selection and in vivo screening. Upon insertion into the 5‟ untranslated region of mRNA and binding the cognate ligand it is able to inhibit translational initiation in yeast. Using enzymatic probing the secondary structure had been postulated comprising global stem-loop architecture with a terminal and an internal loop. In the first part of this thesis, the global conformational arrangement of this 27 nucleotides long RNA element has been studied by means of site-directed spin labeling and PELDOR spectroscopy. Spin-labeled neomycin-responsive riboswitch mutants were synthesized via a Sonogashira cross-coupling reaction between 5-membered pyrroline ring based nitroxide radical (TPA) and 5-iodo-uridine. The labeling positions were chosen outside of the binding pocket and UV melting curves revealed that spin-labeling neither disturbs the secondary structure nor interferes with ligand binding. Efficient ligand binding was proven by thermal stabilization of 20.3±3.3 oC upon addition of neomycin, as well as by cw EPR spectra. PELDOR time traces with long observation time windows and with good signal to noise ratio and modulation depth were recorded for all double-labeled samples allowing a reliable data analysis. The fact that there were no shifts in the measured distances upon addition of neomycin implied the existence of a prearranged tertiary structure of the neomycin-sensing riboswitch without a significant global conformational change induced by ligand binding. Measured distances were in very good agreement with the NMR structure of the ligand-bound state of the riboswitch indicating the intrinsic propensity of the global RNA architecture toward its energetically favored ligand-bound form at low temperature. The results harvested in this work represent the first application of PELDOR for mapping the global structure of a tertiary folded RNA. In the second part of this thesis the possibility of applying PELDOR on nucleic acids (NAs) in cellular environment has been investigated. It was shown before that global NA structure depends on matrix conditions, such as concentration of ions and small molecules, molecular crowding, viscosity and interactions with proteins. Therefore, PELDOR spectroscopy on a double-labeled 12-base pair DNA duplex, the 14-mer cUUCGg tetraloop hairpin RNA and the 27-mer neomycin-sensing riboswitch has been used to obtain long-range distance constraints on such systems in Xenopus laevis oocytes and to compare them with in vitro measurements. The reduced lifetime of nitroxide spin labels under cellular conditions has been a major challenge in these measurements. Investigation of nitroxide reduction kinetics in-cell has revealed that the 5-membered pyrrolidine and pyrroline rings are significantly slower reduced compared to 6-membered piperidine ring based nitroxides. Due to prolonged lifetime of the TPA nitroxides covalently attached to NA molecules PELDOR signals could be measured with good signal-to-noise ratios up to 70 minutes of incubation time. The partial loss of coupled spin labels due to nitroxide reduction only led to a decrease in the modulation depth upon increasing the incubation time. No alterations in the measured distances between in vitro and in-cell experiments implies the existence of stable overall conformations of the 14-mer cUUCGg tetraloop hairpin RNA and the 27-mer neomycin-sensing riboswitch, whereas the 12-bp duplex DNA experiences stacking in-cell but retaining the secondary structure. Thus, for the first time nanometer distance measurements were performed inside cells, clearly laying a foundation for the application of PELDOR spectroscopy to study biological processes in cells, such as diffusion, interaction with proteins and other factors or chemical reactions.
The Alborz Mountains are forming a ~100 km wide, E-W trending mountain chain where individual summits are up to 5000 m in elevation. The Alborz Mountains range are part of the Alpine orogen and are straddling a 2000 km wide area S of the Caspian Sea. The rocks of the Alborz Mountains consist of Neogen sediments, which are affected by folding and faulting. In the western part of the Alborz Mountains the folds and faults are trending NW-SE, whereas in the eastern part they are trending NE-SW. GPS data confirm N-S shortening including dextral strike-slip along ESE-WNW trending faults, and sinistral strike-slip along ENE-WSW trending faults. The present thesis is focusing on the active Garmsar salt nappe, the fragmented roof of which is pierced by rock salt which extruded near the front of the Alborz Mountains Range. During the past 5 m.y. the front of the Alborz chain migrated towards SSW on top of the salt of the Garmsar basin. The salt was squeezed towards SSW and took place at the Great Kavir. The extruded salt is forming the Eyvanekey plateau between the cities of Eyvanekey and Garmsar. Both the Garmsar salt nappe and the Eyvanekey plateau are dextrally displaced for ca. 9 km along the Zirab-Garmsar fault. Structural analyses of the Garmsar salt nappe indicate three different groups of joints which are trending perpendicular and parallel to the local mechanical anisotropy. The folds of the study area are congruent (type 2 and 3 after Ramsay) resulting from viscose inhomogeneous flow. InSAR-Investigations suggest the Alborz Mountains to be lifted up by ca. 1 cm/a, while horizontal shortening is active at a rate of 8 ±2 mm/a. These values are consistent with GPS data. Based on nine „Advanced Synthetic Aperture Radar“ (ASAR) scenarios, produced by the ENVISAT satellite of the European space agency between 2003 and 2006, we used interferograms to map the displacement via 22 increments during 2 – 18 months. The results suggest that the topographic height of the surface of the salt is changing at a rate which is controlled by the season. The displacement ranges from subsidence at -40 to -50 mm/a to uplift of 20 mm/a. In order to investigate the time-dependent deformation with high spatial resolution, we used algorithms which are based on data of small base lines (SBAS). The resulting interferometric SAR time series analyses also suggest that the study area is largely subsiding at a rate that is controlled by the seasons. The map with the averaged LOS deformation velocities, on the other hand, suggests the subsidence to increase from the upper part of the salt nappe towards deeper topographic 5 levels of the agricultural lowlands. The major part of subsidence is probably caused by the annual rainfall which results in subrosion of salt. The spatial changes in the subsidence rate are probably controlled by the distribution of fountains, mining activity at the margin of the salt glacier, and faults and fractures inside the salt. Striking seasonal imprints are obvious along the agricultural areas which are surrounding the Garmsar salt nappe. These areas are rapidly subsiding in summer and spring when groundwater is used for irrigations. The maximum rate of subsidence (40-50 mm/a) is located E and W of the Eyvanekey plateau, where large areas are irrigated. The maximum displacement is 20 mm/a in the farmland and 5 mm/a in the center of the salt nappe. Depth estimates using Euler deconvolution method for gravimetric and magnetic data suggest the salt to extrude from a depth less than ca. 2000 m. The gravity field of the study area is characterized by strong anomalies in the SW and weak anomalies in the NE. A considerable negative anomaly in the N indicates that the northern part subsided, whereas the southern part was lifted up. The seismic data show three major horizons inside the Miocene sediments: the Lower Red Formation, the Qom Formation, and the Upper Red Formation. The western part of the study area seems to be free from salt domes. The layers of the upper part of the Qom Formation show thinning along the NE and NW trending faults. In some areas the seismic reflectors indicate steep faults close the saddle of the folds. NE-SW-, NW-SE and E-Wtrending faults prevail. Analogue experiments have been carried out to extend our knowledge about the evolution of the Garmsar salt dome. We used a scaled model (34 cm * 25 cm * 2.5 cm) that was shortened perpendicular to its long side. The wedge shape of the Alborz Mountains was simulated by a wedge consisting of Styrofoam. Rock salt was simulated using Polydimethylsiloxan (PDMS), a linear viscous material with a viscosity of 2.3*104 Pa s and a density of 0.96 g/cm3 at room temperature. Other sediments were modeled using dry quartz sand. The experimental results can be used to simulate the structural evolution of the study area: The Alborz deformation front was emplaced on top of the salt rocks in the Garmsar area while migrating towards SSW. A salt basin and a salt extrusion have also been produced in the model. Cross sections through the wedge shaped analogue model indicate N- and S-dipping reverse faults, which are in line with the wedge shape of the Alborz chain. Moreover, ENE-WSW trending sinistral and ESE-WNW trending dextral strike-slip faults led to N-S shortening during the Miocene. Structural marker horizons, 6 which have been turned into Z-folds on the western fold limbs and to S-folds on the eastern fold limbs, are comparable with the folds of the study area. Solving the problem of waste is one of the central tasks of environmental protection. It is becoming increasingly difficult to find suitable sites that are acceptable to the public. Salt and salt formations have relevant properties to be utilizing as a repository for each kind of waste. The favorable properties make rock salt highly suitable as a host rock, in particular for nonradioactive and radioactive wastes. The Qom and Garmsar basins are the nearest salt diapirs to the Tehran province, and there are suitable repositories for waste disposal. Based on surface and subsurface data, the Garmsar salt diapir has been investigated as a case example for its suitability as a host and repository for various types of waste. The data used are based on field studies, interferometry, and geophysical investigations. The results of this study suggest the deep bedded salt of the Garmsar Salt Basin to be an appropriate host for the deposition of industrial waste. Rock salt of surficial layers or domes, on the other hand, is not regarded as an appropriate candidate for waste disposal.
The past thirty years have seen dramatic changes to the character of state membership regimes in which practices of easing access to membership for resident non-citizens, extending the franchise to expatriate citizens as well as, albeit in typically more limited ways, to resident non-citizens and an increasing toleration of dual nationality have become widespread. These processes of democratic inclusion, while variously motivated, represent an important trend in the contemporary political order in which we can discern two distinct shifts. The first concerns membership as a status and is characterised in terms of the movement from a simple distinction between single-nationality citizens and single-nationality aliens to a more complex structure of state membership in which we also find dual nationals and denizens (Baubock, 2007a:2395-6). The second shift relates to voting rights and is marked by the movement from the requirement that voting rights are grounded in both citizenship and residence to the relaxing of the joint character of this requirement such that citizenship or residence now increasingly serve as a basis for, at least partial, enfranchisement. In the light of these transformations, it is unsurprising that normative engagement with transnational citizenship – conceived in terms of the enjoyment of membership statuses in two (or more) states – has focused on the issues of access to, and maintenance of, national citizenship, on the one hand, and entitlement to voting rights, on the other hand.
Wastewater treatment plants (WWTPs) do not eliminate micropollutants completely and are thus important point sources for these substances. In particular, concerns about en-docrine disrupting compounds in WWTP effluents give rise to the implementation of advanced treatment steps for the elimination of trace organic contaminants. The present study investigated ozonation (O3) and activated carbon treatment (AC) at two WWTPs. For an ecotoxicological assessment at WWTP Regensdorf, conventionally treated wastewater, wastewater after ozonation, and ozonated wastewater after sand filtration were evaluated in parallel via the fish early life stage toxicity test (FELST) using rainbow trout (Oncorhynchus mykiss). Additionally, a comparative toxicity evalu-ation of ozonated and activated carbon treated effluents was performed at the pilot scale treatment plant in Neuss (WWTP Neuss). For this purpose, four invertebrate tests and one higher plant toxicity test were selected to assess potential biological effects on or-ganisms [Lemna minor growth inhibition test, chironomid toxicity test with Chironomus riparius, Lumbriculus variegatus toxicity test, comet assay with haemolymph of the zebra mussel (Dreissena polymorpha), reproduction test with Potamopyrgus antipo-darum]. All in vivo assays were performed on site at the treatment plants in flow-through test systems. Furthermore, the present study investigated the effects of ozona-tion and activated carbon treatment on endocrine activities [estrogenicity, anti-estrogenicity, androgenicity, anti-androgenicity, aryl-hydrocarbon receptor (AhR) agonistic activity] with yeast based bioassays using solid phase extracted water samples. To evaluate the removal of in vitro non-specific toxicity, a cytotoxicity assay using a rat cell line was applied. The FELST at WWTP Regensdorf revealed a considerable developmental retardation of test organisms exposed to ozonated WW. This was accompanied by a significant decrease in body weight and length compared to reference water, to the conventionally treated WW, and to the ozonated water after sand filtration. Hence sand filtration obvi-ously prevents from adverse ecotoxicological effects of ozonation. An additional test – starting with yolk-sac larvae – resulted in a significant reduction of vitellogenin levels in fish exposed to ozonated wastewater compared to fish reared in conventionally treat-ed wastewater. This demonstrates the effective removal of estrogenic activity by ozonation. At WWTP Neuss, the reproduction test with the mudsnail P. antipodarum exhibited a decreased reproductive output after advanced treatment compared to conventional treatment. This indicates an effective estrogenicity removal by ozonation and activated carbon treatment and is confirmed by results of the yeast estrogen screen with a reduc-tion of in vitro estrogenic activity by > 75%. The L. variegatus test revealed a signifi-cantly enhanced toxicity after ozonation compared to conventional treatment, whereas this effect was reduced following subsequent sand filtration. When ozonation was applied, a significantly increased genotoxicity was observed, detected with the comet assay using haemolymph of the zebra mussel. Again, this effect was removed by subsequent sand filtration to the level of conventional treatment. Activated carbon treatment even resulted in a significant reduction of genotoxicity. At both treatment plants, adverse effects after ozonation may have been a result of the formation of toxic oxidation by-products. However, sand filtration reduced toxication effects, indicating that these oxidation by-products are readily degradable or adsorbable. The results point out that, in any case, ozonation should not be applied without subsequent biologically active post treatment appropriate for oxidation by-products removal (e.g. sand filtration). However, only activated carbon achieved a toxicity reduction compared to the conventional treated wastewater. Thus, it cannot be excluded that po-tential beneficial effects due to ozonation might be masked by residual toxic oxidation by-products passing the sand filter or ozonation is not as effective in toxicity removal as PAC treatment. The yeast based assays with solid phase extracted samples revealed an effective endo-crine activity removal during ozonation and activated carbon filtration (estrogenicity: 77 – 99%, anti-androgenicity: 63 – 96%, AhR agonistic activity: 79 – 82%). The cyto-toxicity assay exhibited a 32% removal of non-specific toxicity after ozonation com-pared to conventional treatment. Ozonation in combination with sand filtration reduced cytotoxic effects by 49%, indicating that sand filtration contributes to the removal of toxicants. Activated carbon treatment was the most effective technology for cytotoxici-ty removal (61%). Sample evaporation reduced cytotoxic effects by 52% (after activated carbon treatment) to 73% (after ozonation), demonstrating that volatile substances contribute considerably to toxic effects, particularly after ozone treatment. These results confirm an effective removal or transformation of toxicants with receptor mediated mode of action and non-specific toxicants during both investigated treatment steps. However, due to the limited extractability, polar ozonation by-products were neglected for toxicity analysis, and hence non-specific toxicity after O3 is underestimated. In the long run, only on-site comparisons at WW receiving water bodies (e.g. communi-ty analysis of fish, macroinvertebrates, plants, microorganisms) – before and after up-grading WWTPs – allow drawing environmentally relevant conclusions regarding bene-fits and risks of advanced WW treatment methods. Conclusively, the benefits and possible negative impacts have to be carefully evaluated to prove that not more environmental impact will be induced than removed by advanced treatment technologies as each additional treatment requires considerable amounts of energy, resources, and infrastructure facilities. Accordingly, comprehensive sustainable approaches for pollution prevention and wastewater treatment (e.g. source control and source separation) are preferable compared to end-of-pipe treatment systems.
Employing NMR spectroscopy, it is not only possible to calculate the three dimensional structures of single proteins, but also to study dynamics and conformational changes of protein-complexes. In fact that is an important aspect, since the protein function depends on dynamics and interactions with other molecules. Therefore the study of protein-protein interactions is of highest importance for a better understanding of biological processes. Based on NMR methods, in this thesis we were able to determine protein-protein interactions within the enterobacterial Rcs signalling complex which is regulated via a phosphorelay. Originally identified as regulator of capsule synthesis, the Rcs phosphorelay is now considered to be implicated in stress response caused by disturbances in the peptidoglycan layer. Beyond that the Rcs system is involved in multiplex transcriptional networks including cell division, motility, biofilm formation and virulence. Because of such global nature and its extraordinary structural organisation involving membrane integrated sensor proteins (RcsC, RcsD), coactivators (RcsF, RcsA) and a transcription factor (RcsB), the Rcs system is one of the most remarkable phosphorelays in the family of enterobacteriacaea. During the complex phosphotransfer the histidine phosphotransferase (HPt) domain of the intermediary RcsD protein mediates the phosphotransfer between RcsC and RcsB, and probably modulates the phosphorylation state of the response regulator RcsB. Therefore the present work has been focused on the interface between RcsD and RcsB in more detail. In the first part of the thesis a new domain within the RcsD protein has been identified and structurally analysed by liquid NMR spectroscopy. RcsD is an inner membrane bound hybrid sensor like-kinase composed of a periplasmic sensor domain and a cytoplasmic portion. The cytoplasmic part contains the histidine like-kinase (HK) domain and the histidine phosphotransferase (HPt) domain. By analysis of the secondary structure in more detail, it was shown here that the two domains are intermitted by an additional 13.3 kDa domain. Corresponding to the position of the ABL (α−β−loop) domain of RcsC, located C-terminal to the RcsC-HK domain, the new identified domain was named RcsD-ABL. The central structural element of RcsD-ABL is a β-sheet composed of six strands with a β1−β2−β3−β4−β6−β5 topology and surrounded by two α-helices α1 and α2. In the second part of the thesis, RcsD-ABL is identified as a binding domain for the response regulator RcsB by NMR titration experiments. Such a binding domain for a response regulator has so far only been described for the histidine kinase CheA. In reportergene assays with β-galactosidase and ONPG as substrate it was shown that overexpression of RcsD-ABL in high amounts inhibited binding of RcsB to its target promoter. The β-galactosidase activity was reduced by 80 % with respect to cells carrying no plasmid encoding RcsD-ABL. The mapping of the binding interface was successfully achieved by chemical shift perturbations, a fast mapping protocol and selective labelling. It was shown that the interaction between RcsD-ABL and RcsB takes place via a binding interface comprising mainly the two α-helices of RcsD-ABL and the α-helices α7, α8 and α10 in the effector domain of RcsB. In the third part of the thesis, the interaction of RcsB with RcsD-ABL was related to that with RcsD-HPt. Using NMR titration experiments and ITC measurements, a comparison of the binding constants (Kd) of RcsB interacting either with the isolated RcsD-ABL (2 PM) or the isolated RcsDHPt domain (40 PM) revealed a higher affinity of RcsD-ABL to RcsB. A conjugate of RcsD-ABL-HPt interacting with RcsB decreased the Kd in the one-site fitting mode to 10 PM. However, the two-site fitting mode applied for RcsD-ABL-HPt/RcsB interaction resulted in a Kd (RcsD-ABL) of 2 PM and a Kd (RcsD-HPt) of 8 PM, indicating that RcsD-ABL enhances the binding of RcsD-HPt to RcsB. In the last part of the thesis, it was partly possible together with the data obtained from NMR titration experiments, PRE measurements and a HADDOCK protocol to develop a geometrical model for the interaction of RcsD with RcsB. In this model the receiver domain of RcsB interacts with the RcsD-HPt domain and the RcsB effector domain interacts with the RcsD-ABL domain. These results lead to surprising insights on the regulation of phosphorelays, since normally the effector domain binds to DNA. Here the effector domain is recognized by the newly identified RcsD-ABL domain. Prospectively, further investigations of phosphorylation affects and mutational studies will be of great interest.
The ability to escape apoptosis or programmed cell death is a hallmark of human cancers, for example pancreatic cancer. This can promote tumorigenesis, since too little cell death by apoptosis disturbs tissue homeostasis. Additionally, defective apoptosis signaling is the underlying cause of failure to respond to current treatment approaches, since therapy-mediated antitumor activity requires the intactness of apoptosis signaling pathways in cancer cells. Thus, the elucidation of defects in the regulation of apoptosis in pancreatic carcinoma can result in the identification of novel targets for therapeutic interference and for exploitation for cancer drug discovery. Keywords: apoptosis; pancreatic cancer; TRAIL; IAPs; mitochondria
"Buffer-stock" models of saving are now standard in the consumption literature. This paper builds theoretical foundations for rigorous understanding of the main features of such models, including the existence of a target wealth ratio and the proposition that aggregate consumption growth equals aggregate income growth in a small open economy populated by buffer stock savers. JEL Classification: D81, D91, E21 Keywords: Precautionary Saving, Buffer Stock Saving, Marginal Propensity to Consume, Permanent Income Hypothesis
Novel insights into the synergistic interaction of Bortezomib and TRAIL: tBid provides the link
(2011)
The proteasome inhibitor Bortezomib has been identified as a potent enhancer of TRAIL-induced apoptosis in several human cancers. However, the identification of the underlying molecular mechanisms of this synergistic cell death induction has been ongoing over the last years. A recent study identifies a new mechanism of action for the synergism of TRAIL and Bortezomib.
Nonequilibrium phase transitions in chiral fluid dynamics including dissipation and fluctuation
(2011)
Chiral fluid dynamics combines the fluid dynamic expansion of a hot and dense plasma created in a heavy-ion collision with the explicit propagation of fluctuations at the chiral phase transition of quantum chromodynamics. From systems in equilibrium long-range fluctuations are expected at a conjectured critical point. Heavy-ion collisions are, however, finite in size and time and very dynamic. It is thus likely that nonequilibrium effects diminish the signal of a critical point. They can, however, stimulate phenomena at a first order phase transitions, like nucleation and spinodal decomposition. Both of phase transition scenarios are investigated in this work. Based on the linear sigma model with constituent quarks a consistent quantum field theoretical approach using the two-particle irreducible effective action is developed to derive both, the local equilibrium properties of the expanding quark fluid and the damping and noise terms in the Langevin equation of the order parameter of the phase transition, the sigma field. Within this formalism it is possible to obtain a conserved energy-momentum tensor of the coupled system. It describes the energy dissipation from the sigma field to the heat bath during relaxation. Within this model we investigate nonequilibrium phenomena in a scenario with a critical point and a first order phase transition. We observe long relaxation times at the phase transition, phase coexistence at the first order phase transition and critical slowing down at the critical point. We find a substantial supercooling in a first order phase transition in our model and due to the energy-momentum exchange also reheating is present. While at the critical point the correlation length increases slightly we find an enhanced intensity of nonequilibrium fluctuations at the first order phase transition, which leads to an increased production of sigma mesons.
In recent years using symmetry has proven to be a very useful tool to simplify computations in semidefinite programming. This dissertation examines the possibilities of exploiting discrete symmetries in three contexts: In SDP-based relaxations for polynomial optimization, in testing positivity of symmetric polynomials, and combinatorial optimization. In these contexts the thesis provides new ways for exploiting symmetries and thus deeper insight in the paradigms behind the techniques and studies a concrete combinatorial optimization question.
A pattern is a word that consists of variables and terminal symbols. The pattern language that is generated by a pattern A is the set of all terminal words that can be obtained from A by uniform replacement of variables with terminal words. For example, the pattern A = a x y a x (where x and y are variables, and the letter a is a terminal symbol) generates the set of all words that have some word a x both as prefix and suffix (where these two occurrences of a x do not overlap). Due to their simple definition, pattern languages have various connections to a wide range of other areas in theoretical computer science and mathematics. Among these areas are combinatorics on words, logic, and the theory of free semigroups. On the other hand, many of the canonical questions in formal language theory are surprisingly difficult. The present thesis discusses various aspects of the inclusion problem of pattern languages. It can be divide in two parts. The first one examines the decidability of pattern languages with a limited number of variables and fixed terminal alphabets. In addition to this, the minimizability of regular expressions with repetition operators is studied. The second part deals with descriptive patterns, the smallest generalizations of arbitrary languages through pattern languages ("smallest" with respect to the inclusion relation). Main questions are the existence and the discoverability of descriptive patterns for arbitrary languages.
The ALICE Time Projection Chamber (TPC) is the main tracking detector of ALICE which was designed to perform well at multiplicities of up to 20000 charged primary and secondary tracks emerging from Pb-Pb collisions. Successful operation of such a large and complex detector requires an elaborate calibration and commissioning. The main goal for the calibration procedures is to provide the information needed for the offline software for the reconstruction of the particle tracks with sufficient precision so that the design performance can be achieved. For a precise reconstruction of particle tracks in the TPC, the calibration of the drift velocity, which in conjunction with the drift time provides the z position of the traversing particles, is essential. In this thesis, an online method for the calibration of the drift velocity is presented. It uses the TPC Laser System which generates 336 straight tracks within the active volume of the TPC. A subset of these tracks, showing sufficiently small distortions, is used in the analysis. The resulting time dependent drift velocity correction parameters are entered into a database and provide start values for the offline reconstruction chain of ALICE. Even though no particle tracking information is used, the online drift velocity calibration is in agreement with the full offline calibration including tracking on the level of about 2 x 10 exp (-4). In chapter 2, a short overview of the ALICE detector, as well as the data taking model of the ALICE, is given. In chapter 3, the TPC detector is described in detail. Lastly in chapter 4, the online drift velocity calibration method is presented, together with a detailed description of the TPC laser system.
Background: Working conditions of nursery school teachers have not been scrutinized thoroughly in scientific research. Only a few studies have so far examined work-load and strain in this profession. Preferably, subjective perceptions should be corroborated by data that can be quantified more objectively and accurately. The aim of the present observational field study was to evaluate pedagogical staffs' workflow.
Methods: In 2009 eleven educators in a day care centre were observed throughout three complete workdays. A total of 250 working hours were recorded.
Results: An educators' workday lasted on average 07:46:59 h (SD = 01:01:10 h).Within this time span, an average of 02:20:46 h (30.14%, SD = 00:28:07 h) were spent on caring, 01:44:18 h on playing (22.33%, SD = 00:54:12 h), 00:49:37 h on educational work (10.62%, SD = 00:40:09), and only 00:05:38 h on individual child contact (1.21%, SD = 00:04:58 h).
Conclusion: For the first time, educators' workflow in day care centres was studied in real time. Some of the educators' self-reported problems were corroborated. The results of this study form a basis upon which further investigations can be built and measures can be developed for an overall improvement of child care.
The interactions of changes in climate and biodiversity with societal actions, structures and processes are a priority topic within the international scientific debate – and thus, a relevant subject matter for BiKF’s work. This paper outlines a concept for transdisciplinary research within BiKF. It focuses on the analysis of social-ecological systems supporting society with biodiversity driven ecosystem services. Such research is considering different issues: defining sustainable societal adaptations to climate induced biodiversity changes; permitting adequate understanding of the social-ecological reproduction of ecosystem functions, including their conservation and restoration; analysing the societal values and socio-economic utilisation of ecosystem services. Gaining knowledge in these areas provides an improved basis for decision-making in biodiversity and resource management.
With which political developments is BiKF confronted as a research centre as well as concerning its research and transfer efforts? Are there any hints for emerging research questions that meet practical needs? This paper gives an overview – as of June 2010 – on priority issues in the run-up to CBD’s COP-10, the 10th Conference of the Parties to the Convention on Biological Diversity (CBD), which will take place in Nagoya/Japan in October 2010. Highlighted discourse threads are: (1) the state of negotiations for an Access and Benefit Sharing (ABS) regime within CBD, (2) European and international preparations for renewing the political objectives for protecting biodiversity (Post-2010 Targets) and (3) the recent decision on an Intergovernmental Science-Policy Platform for Biodiversity and Ecosystem Services (IPBES). These three threads are selected against the background of an in depth analysis of the discourse field which was carried out in 2008/09 for BiKF. They show how the field progresses and which developments are worth being incorporated into BiKF’s further work. This Knowledge Flow Paper documents the talk given by the author during the second BiKF Retreat, 17–18 July 2010.
This article presents new directions of literary and media memory studies. It distinguishes between (1) the study of "traumatic pasts", i.e. representations of war and violence in literature and other media, (2) diachronic and intermedial approaches to "literary afterlives" and (3) recent insights into the inherent transculturality of memory and their consequences for literary and media studies. Keywords: cultural memory studies, literature and memory, media and memory, transcultural memory
Climate change research is increasingly focusing on the dynamics among species, ecosystems and climates. Better data about the historical behaviours of these dynamics are urgently needed. Such data are already available from ecology, archaeology, palaeontology and geology, but their integration into climate change research is hampered by differences in their temporal and geographical scales. One productive way to unite data across scales is the study of functional morphological traits, which can form a common denominator for studying interactions between species and climate across taxa, across ecosystems, across space and through time—an approach we call ‘ecometrics’. The sampling methods that have become established in palaeontology to standardize over different scales can be synthesized with tools from community ecology and climate change biology to improve our understanding of the dynamics among species, ecosystems, climates and earth systems over time. Developing these approaches into an integrative climate change biology will help enrich our understanding of the changes our modern world is undergoing.
The influence of dispersal limitation on species ranges remains controversial. Considering the dramatic impacts of the last glaciation in Europe, species might not have tracked climate changes through time and, as a consequence, their present-day ranges might be in disequilibrium with current climate. For 1016 European plant species, we assessed the relative importance of current climate and limited postglacial migration in determining species ranges using regression modelling and explanatory variables representing climate, and a novel species-specific hind-casting-based measure of accessibility to postglacial colonization. Climate was important for all species, while postglacial colonization also constrained the ranges of more than 50 per cent of the species. On average, climate explained five times more variation in species ranges than accessibility, but accessibility was the strongest determinant for one-sixth of the species. Accessibility was particularly important for species with limited long-distance dispersal ability, with southern glacial ranges, seed plants compared with ferns, and small-range species in southern Europe. In addition, accessibility explained one-third of the variation in species' disequilibrium with climate as measured by the realized/potential range size ratio computed with niche modelling. In conclusion, we show that although climate is the dominant broad-scale determinant of European plant species ranges, constrained dispersal plays an important supplementary role.
Measuring confidence and uncertainty during the financial crisis: evidence from the CFS survey
(2011)
The CFS survey covers individual situations of banks and other companies of the financial sector during the financial crisis. This provides a rare possibility to analyze appraisals, expectations and forecast errors of the core sector of the recent turmoil. Following standard ways of aggregating individual survey data, we first present and introduce the CFS survey by comparing CFS indicators of confidence and predicted confidence to ifo and ZEW indicators. The major contribution is the analysis of several indicators of uncertainty. In addition to well established concepts, we introduce innovative measures based on the skewness of forecast errors and on the share of ‘no response’ replies. Results show that uncertainty indicators fit quite well with pattern of real and financial time series of the time period 2007 to 2010. Business Sentiment , Financial Crisis , Survey Indicator , Uncertainty CFS working paper series, 2010, 18. Revised Version July 2011
I investigate the effect of transparency on the borrowing costs of Emerging Markets Economies. Transparency is measured by whether or not the countries publish the IMF Article IV Staff report and the Reports on the Observance of Standards and Codes (ROSC). Using difference-in-difference estimation, I study the effect on the sovereign credit spreads for 18 Emerging Market Economies over the period 1999-2007. I show that the effect of publishing the Article IV reports is negligible while publishing the ROSC matters, leading to a reduction in the spreads of over 15% in the samples 1999-2006 and 1999-2007. JEL Classification: F33, F34, G15 Keywords: Sovereign Bond Markets, Transparency, Emerging Market Economies
2.1. Background & purpose The recent introduction of new technical innovations such as CT perfusion (CTP) and dual energy CT (DECT) increases the diagnostic abilities of CT for imaging of the head and neck (H&N). The aim of this work was to evaluate the role of CTP and DECT in head and neck imaging. The first part tests whether CTP can differentiate between malignant H&N tumors and surrounding muscle, and discusses the impact of arterial input selection and tumor region of interest (ROI) on CTP of H&N cancer. The second part of the study evaluates radiation dose and image quality of DECT of the H&N. Finally the use of DE derived weighted averaging to improve lesion delineation and image quality is discussed. 2.2. Patients and methods CT perfusion Retrospective analysis of CTP was done for a total number of 55 cases of H&N tumors. Perfusion parameters were calculated for 33 cases of squamous cell carcinoma (SCC) and compared to those of muscles. CTP parameters of 50 cases of H&N tumors calculated using different arterial input functions were compared. CTP was calculated for 28 SCC cases using the single dynamic CT section that shows maximal tumor dimension compared to using average values obtained from all tumor-containing dynamic CT sections. Dual energy CT of head and neck This prospective part of the study was further divided into 2 parts. In the first part 32 consecutive patients underwent DECT of the H&N and were compared to a standard single energy CT (SE) control group. Radiation doses were compared. Weighted-average images from raw data of the 2 DE tubes (weighting factor 0.3 from 80 kVp and 0.7 from 140 KVp) were compared to SE images. Image noise was compared at 5 anatomic levels. Two blinded readers compared subjective overall image quality on a 5-point grading scale. In the second part 35 proved SCC cases underwent DECT of the neck. Pure 140 kVp and 80 kVp image datasets as well as weighted-average images from raw data of the 2 DE tubes at weighting factors 0.3, 0.6, 0.8 (30%, 60% and 80% from 80 kVp raw data respectively) were reconstructed. Objective image noise, contrast to noise ratio (CNR) and subjective image quality were compared between the 5 image datasets. Results CT perfusion Tumor perfusion parameters were significantly higher than those of muscle (p <0.05). Significant high correlation with no significant differences between the means (p >0.05) were observed between perfusion parameters obtained using internal carotid artery (ICA) versus external carotid artery (ECA) and ipsilateral versus contralateral ICA. High correlation was observed between perfusion parameters calculated using one section with maximal tumor dimension and the average of multiple sections. Differences between the means were non significant, p values>0.05. The 95% limits of agreement between repeated measurements using average of multiple sections were slightly narrower for blood volume and permeability than those of repeated measurements using one section. Dual energy CT of head and neck CTDIvol was 12% lower with DE than SECT (p<0.0001). There were no significant differences in objective noise between DECT and SECT at any of the anatomic levels (p >0.05). There were no significant differences between DE- and SECT in attenuation measurements, all p values >0.05. No significant differences in subjective image quality scores were observed between DE- and SECT at any of the 5 anatomic levels (p >0.05). At weighting factor 0.6 the lesion CNR was significantly higher than at weighting factor 0.3 and at pure 140 kVp image dataset (p< 0.0001); while non significantly lower than at weighting factor 0.8 and pure 80 kVp (p=1.00). The 0.6 weighting factor was rated the best at subjective image quality and lesion delineation. 2.4. Conclusion In conclusion; this study demonstrated the ability of CTP to differentiate SCC from surrounding muscle tissue. The choice of arterial input selection has no significant impact on quantitative CTP of H&N tumors. CTP of SCC calculated from one section with maximal tumor dimensions and the average values from multiple sections are not significantly different. The second part of the study showed that DE scanning can be routinely used for H&N imaging; preserving high diagnostic image quality even when the radiation dose was lowered by 12%. Average weighting of DE raw data, with a weighting factor 0.6, results in significant improvement in both tumor delineation and image quality.
This study comprises a survey on ecology, morphology and taxonomy of parasitic fungi infecting Pteridophytes and Orchidaceae found by the author on several field trips to Western Panama as part of the project plant parasitic micro-fungi of Western Panama (ppMP). In Panama, approximately 9500 species of vascular plants are found. Of these, Orchidaceae are with ca. 1150 (ca. 12%) species by far the most speciose family. The Pteridophytes in Panama comprise ca. 940 species in 31 families. Most fungal pathogens on Orchidaceae in tropical regions were described from plants in culture or from material intercepted at borders by plant quarantine services and not from their natural habitats. Therefore, little is known about distribution and ecology of these pathogens in their natural range. The author determined and classified several hundred Orchidaceae-species and Pteridophytes at the sites selected in the context of the project. This work facilitated the identification of many host plants (at least to genus-level) even in sterile condition in the field. About 65 species of Pucciniales are known to infest Orchidaceae and ca. 38% of them are described from tropical America. All available types of Pucciniales on Orchidaceae in tropical America were studied and compared with 91 specimens of rust fungi on orchids collected by the author in Panama. Several hundred additional specimens housed in the BPI, almost all intercepted from plant quarantine services, were used for comparison. As result of this work, it is suggested to combine Uromyces stenorrhynchi Henn. to Sphenospora and, as this is the oldest epithet, to synonymize S. kevorkianii Linder, S. mera Cumm. and S. saphena Cumm. with it. Further, it could be demonstrated that Uredo aurantiaca Montemartini, U. cyrtopodii Syd. & P. Syd., U. epidendri Henn., U. guacae Mayor, U. gynandrearum Corda, U. lynchii (Berk.) Plowr., U. neopustulata Cumm. (≡U. pustulata Henn.), U. nigropuncta Henn., U. oncidii Henn., U. ornithidii F. Kern., Cif. & Thurst., and presumably U. scabies Cke., are anamorphs of this variable species. U. gynandrearum is the oldest anamorph-name for all these taxa. Therefore, it can be established that this rust infects more than 80 species of Orchidaceae in three subfamilies. In total, the anamorph of this species was collected by the author on 17 different species of Orchidaceae in Panama which, apart from one species, are all new hosts to science. The molecular data obtained by the author confirm this view, although more data, especially from material from the whole range of distribution of U. gynandrearum, are necessary. Puccinia spiranthicola Cumm. was found to be a synonym of P. cinnamomea Diet. & Holw. and was found by the author on three different Orchidaceae in two subfamilies. Uredo pleurothallidis Keissl. is now considered a synonym of U. wittmackiana Henn. and the latter as the anamorph of Puccinia oncidii Cumm. In the anamorph genus Uredo, a new species was found infecting at least five different species of Sobralia and Elleanthus (Sobraliinae) at different localities. Molecular data indicate it to be related to the currently polyphyletic Phakopsoraceae. For the rusts with suprastomatal sori on Orchidaceae, now separated from Hemileia and placed in the genus Desmosorus (nom. inval.), the current concept with only one taxon is rejected and the establishment of three subspecies is suggested. The complicated taxonomy is discussed and makes it necessary to validate the genus-name and make a new combination. Another Hemileia-anamorph species was found by the author and is considered to be new to science. This is the first species of this alliance in America on Orchidaceae. Molecular data obtained by the author confirm the separation of Desmosorus from Hemileia and the position of the new species. For rusts on Pteridophytes, a new species of Milesia, (teleomorph: Milesina) and a new anamorphic species of Uredinopsis was found, both on hosts hitherto not known. In Calidion, the presumable anamorph-genus of Uncol, the species C. cf. cenicafeae Salazar & Buriticá was found on several new hosts. Further, the teleomorph was found. Morphologically, this teleomorph did not agree with the description of Uncol by the author of the genus, although the anamorph characteristics left no doubt that it is Calidion. Apparently, the description of Uncol is inadequate, but cannot be improved, as the type is unavailable. Molecular data obtained by the author show this species to be closest to Desmosorus. For Uredo superficialis Speg., the anamorph of Desmella, nine new hosts in eight different fern families were found by the author and the collaborators of the ppMP-project. Ecological data indicate that this species includes different host specific races, which, however could not be distinguished morphologically. For all these rusts, a thorough discussion of the ecology in their habitats is given. In total, 21 LSU rDNA sequences from 6 different rust species on Orchidaceae and Pteridophytes were obtained and analyzed with the Maximum Parsimony and Minimum Evolution method. Here, the position of several groups could be confirmed, and some anamorphs could be assigned to different teleomorphic relationships. Within the Ascomycota and their anamorphs, several hitherto unknown species and species not known from these hosts or not known from Panama were found and analyzed. On Orchidaceae, the following fungi belonging to the Ascomycota are described, illustrated and discussed: In the Phyllachorales, a hitherto not known Phyllachora sp. was found on Oncidium warszewiczii Rchb. f. and was compared with the other species of this order currently known from Orchidaceae. In the Asterinaceae s. l. Lembosia cf. epidendri Meir. Silva & O. R. Pereia was found on Maxillaria crassifolia (Lindl.) Rchb. f., which is a new host and new host alliance for this fungus hitherto only known from Brazil. The fungus is described and compared with all species of Asterinaceae currently known on Orchidaceae. In the Meliolaceae, Meliola orchidacearum Cif. was found on Camaridium biolleyi (Schltr.) Schltr. and an Epidendrum sp. which are new hosts and new host alliances of this fungus which was hitherto only known from the Caribbean Islands. It is described, illustrated and compared with the type. In the Glomerellaceae, Glomerella cingulata and its anamorph Colletotrichum gloeosporioides were found on several hosts. The species is illustrated, described and compared with data from literature. In the anamorphic Mycosphaerellaceae, Pseudocercospora odontoglossii (Prill. & Delacr.) U. Braun, a species currently only known from culture, was found on the new host Pleurothallis imraei Lindl. It is illustrated, described and compared with data from literature. On ferns, the following other fungi are described, illustrated and discussed: A conspicuous undescribed form of Polycyclus was found by the author on Elaphoglossum ciliatum (C. Presl.) T. Moore (Dryopteridaceae) and Serpocaulon loriceum (L.) A. R. Sm. (Polypodiaceae). A conspectus of Parmulariaceae infecting ferns is given and demonstrated that Polycyclina should be synonymized under Polycyclus. Summing up, it can be assessed, especially for the Pucciniales, that the most speciose plant family in Panama carries remarkable few species of specific parasites, and that many of them seem to be distributed over a wide range of species which often are not closely related. One reason amongst others seems to be that parasites need a minimum density of host plants in a habitat to survive. As orchid species often occur with only few (and often small) individual plants at a given locality, the probability for a specific pathogen to infect a plant gets too low, hence high diversity by low abundance of hosts might be an impediment for specific pathogens. In this case, unspecific parasites, or such which are infecting larger alliances, are in advantage. Other reasons could be specific traits of orchids, like succulence and mycotrophy which might hamper fungal infections.
Forty two samples of the Late Eocene Kiliran oil shale, Central Sumatra Basin, Indonesia were collected from a 102 m long drill core. The oil shale core represents the deposition time of about 240.000 years. Palynofacies and geochemical analyses have been carried out to reconstruct the paleoenvironmental conditions and paleoecology during deposition of the oil shale. Amorphous organic matter (AOM) is very abundant (>76%). B. braunii palynomorphs are present (3-16%) as the only autochtonous structured organic matter and generally more abundant in the middle part of the profile. The stable carbon isotopic composition of bulk organic matter (13C) varies from -27.0 to -30.5‰ and is generally more depleted in the middle part of the profile. The ratio of total organic carbon to sulfur (TOC/S), used as salinity indicator, ranges from 2.5 to 15.8 and shows variations along the profile. Slightly less saline environments are observed in the middle part of the profile. Fungal remains are generally present only in this part with a distinct peak of abundance. The presence of fungal remains is regarded as an indication for a relatively warmer climate during deposition of the middle part of the profile. The warmer climate is thought to influence the establishment of a thermocline, limiting the supply of recycled nutrients to epilimnion. Consequently, the primary productivity in the Kiliran lake decreased during deposition of the middle part of the profile as indicated by the relatively depleted 13C values and the blooming of B. braunii. The chemocline was also shoaling during the deposition according to the higher abundance of total isorenieratane and its derivatives originated from green sulfur bacteria dwelling in the photic zone euxinia. The warmer climate is also thought to influence the slightly decrease of water salinity during deposition of the middle part of the profile. The occurrence of B. braunii in Kiliran lake is also recognized from organic geochemical data. The distribution of n-alkanes is characterized by the unusual high amount of C27 n-alkane relative to the other long-chain n-alkanes. The concentrations of C27 n-alkane vary from 30.1 to 393.7 μg/g TOC and are generally in parallel with the abundances of B. braunii palynomorphs along the profile. The 13C values of this compound are about -31‰ and up to 2‰ enriched relative to those of the adjacent long-chain n-alkanes. B. braunii race A can thus be regarded as the significant biological source of the C27 n-alkane. Lower amounts of lycopane are observed in many oil shale samples (0 to 54.7 μg/g TOC). The 13C value of this compound is 17.2‰. This strong enrichment of 13C suggests that the lycopane was derived from B. braunii race L. The concentrations of lycopane develop generally in opposite with those of C27 μalkane. It is likely that both B. braunii races bloomed in alternation in the lake, probably due to changes on specific water chemistry. Norneohop-13(18)-ene and neohop-13(18)-ene derived from methanotrophic bacteria are the dominant hopanoid hydrocarbons. The sum of their concentrations varies from 40.6 to 360.0 μg/g TOC. The 13C of these compounds are extremely depleted (-45.2 to -50.2‰). The occurrence of abundant bacteria including methanotrophic bacteria was responsible for the recycling of carbon below the chemocline of the lake. The effect of the recycling of carbon is observed by the presence of a concomitant depletion (about 7-9‰) in 13C of some specific biomarkers derived from organisms dwelling in the whole phototrophic zone. 4-Methylsterane and 4-methyldiasterene homologues occur in the oil shale as the predominant biomarkers. The sum of the concentrations of all homologues are about 40.3-1,009.2 μg/g TOC with generally higher values in the uppermost and lower parts of the profile. Calcium (Ca) accounts as the predominant element in the oil shale, ranging from 5.0 to 16.7%. This element shows generally parallel variation with the 4-methylsterane and 4-methyldiasterene homologues along the profile. This suggests that these compounds were derived from biological sources favoring more alkaline and more trophic environments. On the other hand, these compounds were less abundant in the middle part of the profile which is consistent with less alkaline and less trophic environments promoting B. braunii to bloom. Alternation between Dinoflagellates and B. braunii in ancient lacustrine environments due to water chemistry changes have been known from previous studies. In the present case, distinct alternation between B. braunii abundances and concentrations of 4-methylsterane and 4-methyldiasterene homologues along the studied oil shale profile suggest a hypothesis that these compounds were derived from freshwater Dinoflagellates although dinosterane is not present in the sediment extracts. Water alkalinity and trophic level changes were most likely responsible for the alternation of Dinoflagellates and B. braunii blooming.
Introduction: Evidence from a number of open-label, uncontrolled studies has suggested that rituximab may benefit patients with autoimmune diseases who are refractory to standard-of-care. The objective of this study was to evaluate the safety and clinical outcomes of rituximab in several standard-of-care-refractory autoimmune diseases (within rheumatology, nephrology, dermatology and neurology) other than rheumatoid arthritis or non-Hodgkin's lymphoma in a real-life clinical setting.
Methods: Patients who received rituximab having shown an inadequate response to standard-of-care had their safety and clinical outcomes data retrospectively analysed as part of the German Registry of Autoimmune Diseases. The main outcome measures were safety and clinical response, as judged at the discretion of the investigators.
Results: A total of 370 patients (299 patient-years) with various autoimmune diseases (23.0% with systemic lupus erythematosus, 15.7% antineutrophil cytoplasmic antibody-associated granulomatous vasculitides, 15.1% multiple sclerosis and 10.0% pemphigus) from 42 centres received a mean dose of 2,440 mg of rituximab over a median (range) of 194 (180 to 1,407) days. The overall rate of serious infections was 5.3 per 100 patient-years during rituximab therapy. Opportunistic infections were infrequent across the whole study population, and mostly occurred in patients with systemic lupus erythematosus. There were 11 deaths (3.0% of patients) after rituximab treatment (mean 11.6 months after first infusion, range 0.8 to 31.3 months), with most of the deaths caused by infections. Overall (n = 293), 13.3% of patients showed no response, 45.1% showed a partial response and 41.6% showed a complete response. Responses were also reflected by reduced use of glucocorticoids and various immunosuppressives during rituximab therapy and follow-up compared with before rituximab. Rituximab generally had a positive effect on patient well-being (physician's visual analogue scale; mean improvement from baseline of 12.1 mm).
Conclusions: Data from this registry indicate that rituximab is a commonly employed, well-tolerated therapy with potential beneficial effects in standard of care-refractory autoimmune diseases, and support the results from other open-label, uncontrolled studies.
Background: The zinc finger transcription factor Egr-1 (Early growth response 1) is central to several growth factors and represents an important activator of target genes not only involved in physiological processes like embryogenesis and neonatal development, but also in a variety of pathophysiological processes, for example atherosclerosis or cancer. Current options to investigate its transcription and activation in vivo are end-point measurements that do not provide insights into dynamic changes in the living organism. Results: We developed a transgenic mouse (Egr-1-luc) in which the luciferase reporter gene is under the control of the murine Egr-1 promoter providing a versatile tool to study the time course of Egr-1 activation in vivo. In neonatal mice, bioluminescence imaging revealed a high Egr-1 promoter activity reaching basal levels three weeks after birth with activity at snout, ears and paws. Using a model of partial hepatectomy we could show that Egr-1 promoter activity and Egr-1 mRNA levels were increased in the regenerating liver. In a model of wound healing, we demonstrated that Egr-1 promoter activity was upregulated at the site of injury. Conclusion: Taken together, we have developed a transgenic mouse model that allows real time in vivo imaging of the Egr-1 promoter activity. The ability to monitor and quantify Egr-1 activity in the living organism may facilitate a better understanding of Egr-1 function in vivo. Additional File 1: BLI of adult Egr-1-luc mice with opened body cavity. Transgenic Egr-1-luc mice (one month old) received 6 mg luciferin in 100 μl PBS by intraperitoneal injection. Ten minutes thereafter the animal was killed by cervical dislocation, the body cavity opened immediately, skin from the ventral side partially removed and BLI measurement was carried out (10 min signal collection, setting 'high resolution'). A representative animal is shown with similar amplification setting as in Figure 2A.
Background: Factors and processes shaping the population structure and spatial distribution of genetic diversity across a species' distribution range are important in determining the range limits. We comprehensively analysed the influence of recurrent and historic factors and processes on the population genetic structure, mating system and the distribution of genetic variability of the pulmonate freshwater snail Radix balthica. This analysis was based on microsatellite variation and mitochondrial haplotypes using Generalised Linear Statistical Modelling in a Model Selection framework. Results: Populations of R. balthica were found throughout North-Western Europe with range margins marked either by dispersal barriers or the presence of other Radix taxa. Overall, the population structure was characterised by distance independent passive dispersal mainly along a Southwest-Northeast axis, the absence of isolation-by-distance together with rather isolated and genetically depauperated populations compared to the variation present in the entire species due to strong local drift. A recent, climate driven range expansion explained most of the variance in genetic variation, reducing at least temporarily the genetic variability in this area. Other factors such as geographic marginality and dispersal barriers play only a minor role. Conclusions: To our knowledge, such a population structure has rarely been reported before. It might nevertheless be typical for passively dispersed, patchily distributed taxa (e.g. freshwater invertebrates). The strong local drift implied in such a structure is expected to erode genetic variation at both neutral and coding loci and thus probably diminish evolutionary potential. This study shows that the analysis of multiple factors is crucial for the inference of the processes shaping the distribution of genetic variation throughout species ranges. Additional files Additional file 1: Distribution of Radix taxa. Spatial distribution of the Radix MOTU as defined in Pfenninger et al. 2006 plus an additional, newly discovered taxon. This map is the basis for the inference of the species range of R. balthica. Additional file 2: Sampling site table and spatial distribution of diversity indices, selfing estimates and inferred population bottlenecks for R. balthica. Table of sampling site code, geographical position in decimal degrees latitude and longitude, number of individuals analysed with microsatellites (Nnuc), expected heterozygosity (HE) and standard deviation across loci, mean rarefied number of alleles per microsatellite locus (A) and their standard deviation, number of individuals analysed for mitochondrial variation (Nmt), rarefied number of mitochondrial COI haplotypes (Hmt), number of individuals measured for body size (Nsize). Figures A1 - A3 show a graphical representation of the spatial distribution of He, Hmt and, s, respectively. Additional file 3: Assessment of environmental marginality. PCA (principle component analysis) on 35 climatic parameters for the period from 1960 - 2000 from publicly availableWorldClim data. Additional file 4: Inference of a recent climate driven range expansion in R. balthica. Analysis of the freshwater benthos long term monitoring data of the Swedish national monitoring databases at the Swedish University of Agricultural Sciences SLU with canonical correspondence analysis.
Background: Asthma is increasing worldwide and results from a complex immunological interaction between genetic susceptibility and environmental factors. Autovaccination with E. coli induces a strong TH-1 immune response, thus offering an option for the treatment of allergic diseases. Methods: Prospective open trial on safety, tolerability, and impact on allergic inflammation of an autologous E.coli autovaccine in intermittent or mild persistent house dust mite asthma. Determination of exhaled nitric monoxide (eNO) before and after bronchial mite challenge initially and after nine months of autovaccination. Results: Median eNO increase after autovaccination was significantly smaller (from 27.3 to 33.8 ppb; p=0.334) compared to initial values (from 32.6 to 42.2 ppb; p=0.046) (p=0.034). In nine subjects and a total of 306 injections, we observed 101 episodes of local erythema (33.3%; median of maximal diameter 2.5 cm), 95 episodes of local swelling (31.1%; median of maximal diameter 3 cm), and 27 episodes of local pain (8.8%). Four subjects reported itching at the injection site with a total of 30 episodes (9.8%). We observed no serious adverse events. All organ functions (inclusive electrocardiogramm) and laboratory testing of the blood (clinical chemistry, hematology) and the urine (screening test, B-microglobuline) were within normal limits. Vital signs undulated within the physiological variability. Conclusion: The administration of autologous autovacine for the treatment of house dust mite asthma resulted in a reduction of the eNO increase upon bronchial mite challenge. In nine subjects and 306 injections, only a few mild local reactions and no systemic severe adverse events were observed. EudraCT Nr. 2005-005534-12 ClinicalTrials.gov ID NCT00677209
Background: Care management programmes are an effective approach to care for high risk patients with complex care needs resulting from multiple co-occurring medical and non-medical conditions. These patients are likely to be hospitalized for a potentially "avoidable" cause. Nurse-led care management programmes for high risk elderly patients showed promising results. Care management programmes based on health care assistants (HCAs) targeting adult patients with a high risk of hospitalisation may be an innovative approach to deliver cost-efficient intensified care to patients most in need. Methods: PraCMan is a cluster randomized controlled trial with primary care practices as unit of randomisation. The study evaluates a complex primary care practice-based care management of patients at high risk for future hospitalizations. Eligible patients either suffer from type 2 diabetes mellitus, chronic obstructive pulmonary disease, chronic heart failure or any combination. Patients with a high likelihood of hospitalization within the following 12 months (based on insurance data) will be included in the trial. During 12 months of intervention patients of the care management group receive comprehensive assessment of medical and non-medical needs and resources as well as regular structured monitoring of symptoms. Assessment and monitoring will be performed by trained HCAs from the participating practices. Additionally, patients will receive written information, symptom diaries, action plans and a medication plan to improve self-management capabilities. This intervention is addition to usual care. Patients from the control group receive usual care. Primary outcome is the number of all-cause hospitalizations at 12 months follow-up, assessed by insurance claims data. Secondary outcomes are health-related quality of life (SF12, EQ5D), quality of chronic illness care (PACIC), health care utilisation and costs, medication adherence (MARS), depression status and severity (PHQ-9), self-management capabilities and clinical parameters. Data collection will be performed at baseline, 12 and 24 months (12 months post-intervention). Discussion: Practice-based care management for high risk individuals involving trained HCAs appears to be a promising approach to face the needs of an aging population with increasing care demands. Trial registration: Current Controlled Trials ISRCTN56104508
Background: The automation of objectively selecting amino acid residue ranges for structure superpositions is important for meaningful and consistent protein structure analyses. So far there is no widely-used standard for choosing these residue ranges for experimentally determined protein structures, where the manual selection of residue ranges or the use of suboptimal criteria remain commonplace. Results: We present an automated and objective method for finding amino acid residue ranges for the superposition and analysis of protein structures, in particular for structure bundles resulting from NMR structure calculations. The method is implemented in an algorithm, CYRANGE, that yields, without protein-specific parameter adjustment, appropriate residue ranges in most commonly occurring situations, including low-precision structure bundles, multi-domain proteins, symmetric multimers, and protein complexes. Residue ranges are chosen to comprise as many residues of a protein domain that increasing their number would lead to a steep rise in the RMSD value. Residue ranges are determined by first clustering residues into domains based on the distance variance matrix, and then refining for each domain the initial choice of residues by excluding residues one by one until the relative decrease of the RMSD value becomes insignificant. A penalty for the opening of gaps favours contiguous residue ranges in order to obtain a result that is as simple as possible, but not simpler. Results are given for a set of 37 proteins and compared with those of commonly used protein structure validation packages. We also provide residue ranges for 6351 NMR structures in the Protein Data Bank. Conclusions: The CYRANGE method is capable of automatically determining residue ranges for the superposition of protein structure bundles for a large variety of protein structures. The method correctly identifies ordered regions. Global structure superpositions based on the CYRANGE residue ranges allow a clear presentation of the structure, and unnecessary small gaps within the selected ranges are absent. In the majority of cases, the residue ranges from CYRANGE contain fewer gaps and cover considerably larger parts of the sequence than those from other methods without significantly increasing the RMSD values. CYRANGE thus provides an objective and automatic method for standardizing the choice of residue ranges for the superposition of protein structures. Additional files Additional file 1: Dependence of Q on the order parameter rank. The quantity Qi is plotted against the order parameter rank i for 9 different protein structure bundles. Additional file 2: Dependence of P on the clustering stage. The quantity Pi is plotted against the clustering stage i for 9 different protein structure bundles. Additional file 3: Dependence of CYRANGE results on the minimal cluster size parameter my. The sequence coverage (red) and RMSD (blue) of the residue ranges determined by CYRANGE were plotted as a function of my for 9 different protein structure bundles. The dotted vertical line indicates the default value, my = 8. Where CYRANGE found two domains, the RMSD values of the individual domains are shown in light and dark blue. Additional file 4: Dependence of CYRANGE results on the domain boundary extension parameter m. See Additional File 3 for details. Additional file 5: Dependence of CYRANGE results on the minimal gap width g. See Additional File 3 for details. Additional file 6: Dependence of CYRANGE results on the relative RMSD decrease parameter delta. See Additional File 3 for details. Additional file 7: Dependence of CYRANGE results on the absolute RMSD decrease parameter delta abs. See Additional File 3 for details. Additional file 8: Dependence of CYRANGE results on the gap penalty parameter gamma. See Additional File 3 for details. Additional file 9: Correlation between the sequence coverage from CYRANGE, FindCore and PSVS, and the GDT total score, GDT_TS. Each data point represents a protein shown in Figures 3 and 4. The coverage is the percentage of amino acid residues included in the residue ranges found by the different methods. The GDT_TS value is defined by GDT_TS = (P1 + P2 + P4 + P8)/4, where Pd is the fraction of residues that can be superimposed under a distance cutoff of d Å. Additional file 10: Correlation between the RMSD value for the residue ranges from CYRANGE, FindCore and PSVS, and the GDT total score, GDT_TS. Each data point represents one protein domain. See Additional File 9 for details.
Background: Dispersal rates, i.e. the effective number of dispersing individuals per unit time, are the product of dispersal capacity, i.e. a species physiological potential for dispersal, dispersal behaviour, i.e. the decision to leave a habitat patch in favour of another, and connectivity of occupied habitat. Dispersal of species that are highly specialised to a certain habitat is thus strongly limited by habitat availability. Additionally, species inhabiting very stable environments may adopt a sedentary life-style. Both factors should lead to strong genetic differentiation in highly specialised species inhabiting stable environments. These two factors apply to our model species Rhyacophila pubescens a highly specialised freshwater insect that occurs in tufa springs, a very stable habitat. Results: We examined the genetic population structure and phylogeography using range-wide mtCOI sequence and AFLP data from 333 individuals of R. pubescens. We inferred the location of Pleistocene refugia and postglacial colonisation routes of R. pubescens, and examined ongoing local differentiation. Our results indicate intraregional differentiation with a high number of locally endemic haplotypes, that we attributed to habitat specificity and low dispersal rates of R. pubescens. We observed high levels of genetic diversity south of the Alps and genetic impoverishment north of the Alps. Estimates of migrants placed the refugium and the source of the colonisation in the Dauphine Alps (SW Alps). Conclusions: This is the first example of an aquatic insect with a colonisation route along the western margin of the Alps to the Central European highlands. The study also shows that specialisation to a stable environment may have promoted a behavioural shift to decreased dispersal rates, leading to stronger local population differentiation than in less specialised aquatic insects. Alternatively, the occurrence of highly specialised tufa spring habitats may have been more widespread in the past, leading to range regression and fragmentation among present day R. pubescens populations.
Background: Natural history museums receive a rapidly growing number of requests for tissue samples from preserved specimens for DNA-based studies. Traditionally, dried vertebrate specimens were treated with arsenic because of its toxicity and insect-repellent effect. Arsenic has negative effects on in vivo DNA repair enzymes and consequently may inhibit PCR performance. In bird collections, foot pad samples are often requested since the feet were not regularly treated with arsenic and because they are assumed to provide substantial amounts of DNA. However, the actual influence of arsenic on DNA analyses has never been tested. Findings: PCR success of both foot pad and body skin samples was significantly lower in arsenic-treated samples. In general, foot pads performed better than body skin samples. Moreover, PCR success depends on collection date in which younger samples yielded better results. While the addition of arsenic solution to the PCR mixture had a clear negative effect on PCR performance after the threshold of 5.4 μg/μl, such high doses of arsenic are highly unlikely to occur in dried zoological specimens. Conclusions: While lower PCR success in older samples might be due to age effects and/or DNA damage through arsenic treatment, our results show no inhibiting effect on DNA polymerase. We assume that DNA degradation proceeds more rapidly in thin tissue layers with low cell numbers that are susceptible to external abiotic influences. In contrast, in thicker parts of a specimen, such as foot pads, the outermost horny skin may act as an additional barrier. Since foot pads often performed better than body skin samples, the intention to preserve morphologically important structures of a specimen still conflicts with the aim to obtain optimal PCR success. Thus, body skin samples from recently collected specimens should be considered as alternative sources of DNA.
Background: Until recently, read lengths on the Solexa/Illumina system were too short to reliably assemble transcriptomes without a reference sequence, especially for non-model organisms. However, with read lengths up to 100 nucleotides available in the current version, an assembly without reference genome should be possible. For this study we created an EST data set for the common pond snail Radix balthica by Illumina sequencing of a normalized transcriptome. Performance of three different short read assemblers was compared with respect to: the number of contigs, their length, depth of coverage, their quality in various BLAST searches and the alignment to mitochondrial genes. Results: A single sequencing run of a normalized RNA pool resulted in 16,923,850 paired end reads with median read length of 61 bases. The assemblies generated by VELVET, OASES, and SeqMan NGEN differed in the total number of contigs, contig length, the number and quality of gene hits obtained by BLAST searches against various databases, and contig performance in the mt genome comparison. While VELVET produced the highest overall number of contigs, a large fraction of these were of small size (< 200bp), and gave redundant hits in BLAST searches and the mt genome alignment. The best overall contig performance resulted from the NGEN assembly. It produced the second largest number of contigs, which on average were comparable to the OASES contigs but gave the highest number of gene hits in two out of four BLAST searches against different reference databases. A subsequent meta-assembly of the four contig sets resulted in larger contigs, less redundancy and a higher number of BLAST hits. Conclusion: Our results document the first de novo transcriptome assembly of a non-model species using Illumina sequencing data. We show that de novo transcriptome assembly using this approach yields results useful for downstream applications, in particular if a meta-assembly of contig sets is used to increase contig quality. These results highlight the ongoing need for improvements in assembly methodology. Keywords: next generation sequencing; short read assembly; Mollusca
Background: The ventral midbrain contains a diverse array of neurons, including dopaminergic neurons of the ventral tegmental area (VTA) and substantia nigra (SN) and neurons of the red nucleus (RN). Dopaminergic and RN neurons have been shown to arise from ventral mesencephalic precursors that express Sonic Hedgehog (Shh). However, Shh expression, which is initially confined to the mesencephalic ventral midline, expands laterally and is then downregulated in the ventral midline. In contrast, expression of the Hedgehog target gene Gli1 initiates in the ventral midline prior to Shh expression, but after the onset of Shh expression it is expressed in precursors lateral to Shh-positive cells. Given these dynamic gene expression patterns, Shh and Gli1 expression could delineate different progenitor populations at distinct embryonic time points. Results: We employed genetic inducible fate mapping (GIFM) to investigate whether precursors that express Shh (Shh-GIFM) or transduce Shh signaling (Gli1-GIFM) at different time points give rise to different ventral midbrain cell types. We find that precursors restricted to the ventral midline are labeled at embryonic day (E)7.5 with Gli1-GIFM, and with Shh-GIFM at E8.5. These precursors give rise to all subtypes of midbrain dopaminergic neurons and the anterior RN. A broader domain of progenitors that includes the ventral midline is marked with Gli1-GIFM at E8.5 and with Shh-GIFM at E9.5; these fate-mapped cells also contribute to all midbrain dopaminergic subtypes and to the entire RN. In contrast, a lateral progenitor domain that is labeled with Gli1-GIFM at E9.5 and with Shh-GIFM at E11.5 has a markedly reduced potential to give rise to the RN and to SN dopaminergic neurons, and preferentially gives rise to the ventral-medial VTA. In addition, cells derived from Shh- and Gli1-expressing progenitors located outside of the ventral midline give rise to astrocytes. Conclusions: We define a ventral midbrain precursor map based on the timing of Gli1 and Shh expression, and suggest that the diversity of midbrain dopaminergic neurons is at least partially determined during their precursor stage when their medial-lateral position, differential gene expression and the time when they leave the ventricular zone influence their fate decisions.
Background: Parkinson's disease (PD) is a slowly progressive neurodegenerative disorder which affects widespread areas of the brainstem, basal ganglia and cerebral cortex. A number of proteins are known to accumulate in parkinsonian brains including ubiquitin and alpha-synuclein. Prion diseases are sporadic, genetic or infectious disorders with various clinical and histopathological features caused by prion proteins as infectious proteinaceous particles transmitting a misfolded protein configuration through brain tissue. The most important form is Creutzfeldt-Jakob disease which is associated with a self-propagating pathological precursor form of the prion protein that is physiologically widely distributed in the central nervous system. Discussion: It has recently been found that alpha-synuclein may behave similarly to the prion precursor and propagate between cells. The post-mortem proof of alpha-synuclein containing Lewy bodies in embryonic dopamine cells transplants in PD patient suggests that the misfolded protein might be transmitted from the diseased host to donor neurons reminiscent of prion behavior. The involvement of the basal ganglia and brainstem in the degenerative process are other congruencies between Parkinson's and Creutzfeldt-Jakob disease. However, a number of issues advise caution before categorizing Parkinson's disease as a prion disorder, because clinical appearance, brain imaging, cerebrospinal fluid and neuropathological findings exhibit fundamental differences between both disease entities. Most of all, infectiousness, a crucial hallmark of prion diseases, has never been observed in PD so far. Moreover, the cellular propagation of the prion protein has not been clearly defined and it is, therefore, difficult to assess the molecular similarities between the two disease entities. Summary: At the current state of knowledge, the molecular pathways of transmissible pathogenic proteins are not yet fully understood. Their exact involvement in the pathophysiology of prion disorders and neurodegenerative diseases has to be further investigated in order to elucidate a possible overlap between both disease categories that are currently regarded as distinct entities.
Poster presentation from Twentieth Annual Computational Neuroscience Meeting: CNS*2011 Stockholm, Sweden. 23-28 July 2011. In statistical spike train analysis, stochastic point process models usually assume stationarity, in particular that the underlying spike train shows a constant firing rate (e.g. [1]). However, such models can lead to misinterpretation of the associated tests if the assumption of rate stationarity is not met (e.g. [2]). Therefore, the analysis of nonstationary data requires that rate changes can be located as precisely as possible. However, present statistical methods focus on rejecting the null hypothesis of stationarity without explicitly locating the change point(s) (e.g. [3]). We propose a test for stationarity of a given spike train that can also be used to estimate the change points in the firing rate. Assuming a Poisson process with piecewise constant firing rate, we propose a Step-Filter-Test (SFT) which can work simultaneously in different time scales, accounting for the high variety of firing patterns in experimental spike trains. Formally, we compare the numbers N1=N1(t,h) and N2=N2(t,h) of spikes in the time intervals (t-h,t] and (h,t+h]. By varying t within a fine time lattice and simultaneously varying the interval length h, we obtain a multivariate statistic D(h,t):=(N1-N2)/V(N1+N2), for which we prove asymptotic multivariate normality under homogeneity. From this a practical, graphical device to spot changes of the firing rate is constructed. Our graphical representation of D(h,t) (Figure 1A) visualizes the changes in the firing rate. For the statistical test, a threshold K is chosen such that under homogeneity, |D(h,t)|<K holds for all investigated h and t with probability 0.95. This threshold can indicate potential change points in order to estimate the inhomogeneous rate profile (Figure 1B). The SFT is applied to a sample data set of spontaneous single unit activity recorded from the substantia nigra of anesthetized mice. In this data set, multiple rate changes are identified which agree closely with visual inspection. In contrast to approaches choosing one fixed kernel width [4], our method has advantages in the flexibility of h.
Poster presentation from Twentieth Annual Computational Neuroscience Meeting: CNS*2011 Stockholm, Sweden. 23-28 July 2011. One of the central questions in neuroscience is how neural activity is organized across different spatial and temporal scales. As larger populations oscillate and synchronize at lower frequencies and smaller ensembles are active at higher frequencies, a cross-frequency coupling would facilitate flexible coordination of neural activity simultaneously in time and space. Although various experiments have revealed amplitude-to-amplitude and phase-to-phase coupling, the most common and most celebrated result is that the phase of the lower frequency component modulates the amplitude of the higher frequency component. Over the recent 5 years the amount of experimental works finding such phase-amplitude coupling in LFP, ECoG, EEG and MEG has been tremendous (summarized in [1]). We suggest that although the mechanism of cross-frequency-coupling (CFC) is theoretically very tempting, the current analysis methods might overestimate any physiological CFC actually evident in the signals of LFP, ECoG, EEG and MEG. In particular, we point out three conceptual problems in assessing the components and their correlations of a time series. Although we focus on phase-amplitude coupling, most of our argument is relevant for any type of coupling. 1) The first conceptual problem is related to isolating physiological frequency components of the recorded signal. The key point is to notice that there are many different mathematical representations for a time series but the physical interpretation we make out of them is dependent on the choice of the components to be analyzed. In particular, when one isolates the components by Fourier-representation based filtering, it is the width of the filtering bands what defines what we consider as our components and how their power or group phase change in time. We will discuss clear cut examples where the interpretation of the existence of CFC depends on the width of the filtering process. 2) A second problem deals with the origin of spectral correlations as detected by current cross-frequency analysis. It is known that non-stationarities are associated with spectral correlations in the Fourier space. Therefore, there are two possibilities regarding the interpretation of any observed CFC. One scenario is that basic neuronal mechanisms indeed generate an interaction across different time scales (or frequencies) resulting in processes with non-stationary features. The other and problematic possibility is that unspecific non-stationarities can also be associated with spectral correlations which in turn will be detected by cross frequency measures even if physiologically there is no causal interaction between the frequencies. 3) We discuss on the role of non-linearities as generators of cross frequency interactions. As an example we performed a phase-amplitude coupling analysis of two nonlinearly related signals: atmospheric noise and the square of it (Figure 1) observing an enhancement of phase-amplitude coupling in the second signal while no pattern is observed in the first. Finally, we discuss some minimal conditions need to be tested to solve some of the ambiguities here noted. In summary, we simply want to point out that finding a significant cross frequency pattern does not always have to imply that there indeed is physiological cross frequency interaction in the brain.
Poster presentation from Twentieth Annual Computational Neuroscience Meeting: CNS*2011 Stockholm, Sweden. 23-28 July 2011. To truly appreciate the myriad of events which relate synaptic function and vesicle dynamics, simulations should be done in a spatially realistic environment. This holds true in particular in order to explain the rather astonishing motor patterns presented here which we observed within in vivo recordings which underlie peristaltic contractions at a well characterized synapse, the neuromuscular junction (NMJ) of the Drosophila larva. To this end, we have employed a reductionist approach and generated three dimensional models of single presynaptic boutons at the Drosophila larval NMJ. Vesicle dynamics are described by diffusion-like partial differential equations which are solved numerically on unstructured grids using the uG platform. In our model we varied parameters such as bouton-size, vesicle output probability (Po), stimulation frequency and number of synapses, to observe how altering these parameters effected bouton function. Hence we demonstrate that the morphologic and physiologic specialization maybe a convergent evolutionary adaptation to regulate the trade off between sustained, low output, and short term, high output, synaptic signals. There seems to be a biologically meaningful explanation for the co-existence of the two different bouton types as previously observed at the NMJ (characterized especially by the relation between size and Po),the assigning of two different tasks with respect to short- and long-time behaviour could allow for an optimized interplay of different synapse types. As a side product, we demonstrate how advanced methods from numerical mathematics could help in future to resolve also other difficult experimental neurobiological issues.
Poster presentation from Twentieth Annual Computational Neuroscience Meeting: CNS*2011 Stockholm, Sweden. 23-28 July 2011. Parallel multiunit recordings from V1 in anesthetized cat were collected during the presentation of random sequences of drifting sinusoidal gratings at 12 fixed orientations while gamma oscillations were present. In agreement with the seminal work [1], most units were orientation selective to varying degrees and synchronization was evident in spike train crosscorrelograms computed between units with similar preferred orientations, particularly during the presentation of optimal stimuli. Interestingly, a subset of units, which we refer to as synchronization hubs, were additionally found to synchronize with units having differing preferred orientations which was consistent with a previous study [2]. Moreover, oscillatory patterning in spike train autocorrelograms was also found to be strongest in units denoted as synchronization hubs, and synchronization hubs also tended to have narrower tuning curves relative to other units. We used simplified computational models of small networks of V1 neurons to demonstrate that neurons subject to a sufficiently strong level of inhibitory input can function as synchronization hubs. Neurons were endowed either with integrate-and-fire or conductance-based dynamics and each neuron received a combination of excitatory (AMPA) synaptic inputs that were Poisson-distributed and inhibitory (GABA) inputs that were coherent at a gamma-frequency range. If the strength of rhythmic inhibition was increased for a subset of neurons in the network, and excitation was increased simultaneously to maintain a fixed firing rate, then these neurons produced stronger oscillatory patterning in their discharge probabilities. The oscillations in turn synchronized these neurons with other neurons in the network. Importantly, the strength of synchronization increased with neurons of differing orientation preferences even though no direct synaptic coupling existed between the hubs and the other neurons. Enhanced levels of inhibition account for the emergence of synchronization hubs in the following way: Inhibitory inputs exhibiting a gamma rhythm determine a time window within which a cell is likely to discharge. Increased levels of inhibition narrow down this window further simultaneously leading to (i) even stronger oscillatory patterning of the neuron's activity and (ii) enhanced synchronization with other neurons. This enables synchronization even between cells with differing orientation preferences. Additionally, the same increased levels of inhibition may be responsible for the narrow tuning curves of hub neurons. In conclusion, synchronization hubs may be the cells that interact most strongly with the network of inhibitory interneurons during gamma oscillations in primary visual cortex.
Poster presentation from Twentieth Annual Computational Neuroscience Meeting: CNS*2011 Stockholm, Sweden. 23-28 July 2011. Background: Oscillatory activity in high-beta and gamma bands (20-80Hz) is known to play an important role in cortical processing being linked to cognitive processes and behavior. Beta/gamma oscillations are thought to emerge in local cortical circuits via two mechanisms: the interaction between excitatory principal cells and inhibitory interneurons – the pyramidal-interneuron gamma (PING) [1], and in networks of coupled inhibitory interneurons under tonic excitation – the interneuronal gamma (ING) [2]. Experimental evidence underlines the important role of inhibitory interneurons and especially of the fast spiking (FS) interneurons [3,4]. We show in simulation that an important property of FS neurons, namely the membrane resonance (frequency preference), represents an additional mechanism – the resonance induced gamma (RING), i.e. modulation of oscillatory discharge by resonance. RING promotes frequency stability and enables oscillations in purely excitatory networks. Methods: Local circuits were modeled with small world networks of 80% excitatory and 20% inhibitory neuron populations interconnected in small-world topology by realistic conductance-based synapses. Neuron populations were leaky integrate and fire (LIF) or Izhikevich resonator (RES) neurons. We also tested networks of purely inhibitory and purely excitatory RES neurons. Networks were stimulated with miniature postsynaptic potentials (MINIs) [5] and with low frequency sinusoidal (0.5 Hz) input that mimics the effect of gratings passing trough the visual field. The activity was calibrated to match recordings from cat visual cortex (firing rate, oscillatory activity). Results: Sinusoidal input modulates network oscillation frequency. This effect is most prominent in IF excitatory and IF inhibitory (IF-IF) networks and less prominent (about 4 times) in IF-RES or RES-IF networks where frequency remains relatively stable. The most stable frequency was observed in networks of pure resonators (RES-RES, None-RES, RES-None). Interestingly, purely excitatory RES networks (RES-None) were also able to exhibit oscillations through RING. By contrast purely excitatory or inhibitory IF networks (IF-None, None-IF) were not able to express oscillations under these conditions, matching experimental parameters. Conclusions: In both PING and ING, adding membrane resonance to principal cells or inhibitory interneurons stabilizes network oscillation frequency via the RING mechanism. Notably, in networks of purely excitatory networks, where ING and PING are not defined, oscillations can emerge via the RING mechanism if membrane resonance is expressed. Thus, RING appears as a potentially important mechanism for promoting stable network oscillations.
TRENTOOL : an open source toolbox to estimate neural directed interactions with transfer entropy
(2011)
To investigate directed interactions in neural networks we often use Norbert Wiener's famous definition of observational causality. Wiener’s definition states that an improvement of the prediction of the future of a time series X from its own past by the incorporation of information from the past of a second time series Y is seen as an indication of a causal interaction from Y to X. Early implementations of Wiener's principle – such as Granger causality – modelled interacting systems by linear autoregressive processes and the interactions themselves were also assumed to be linear. However, in complex systems – such as the brain – nonlinear behaviour of its parts and nonlinear interactions between them have to be expected. In fact nonlinear power-to-power or phase-to-power interactions between frequencies are reported frequently. To cover all types of non-linear interactions in the brain, and thereby to fully chart the neural networks of interest, it is useful to implement Wiener's principle in a way that is free of a model of the interaction [1]. Indeed, it is possible to reformulate Wiener's principle based on information theoretic quantities to obtain the desired model-freeness. The resulting measure was originally formulated by Schreiber [2] and termed transfer entropy (TE). Shortly after its publication transfer entropy found applications to neurophysiological data. With the introduction of new, data efficient estimators (e.g. [3]) TE has experienced a rapid surge of interest (e.g. [4]). Applications of TE in neuroscience range from recordings in cultured neuronal populations to functional magnetic resonanace imaging (fMRI) signals. Despite widespread interest in TE, no publicly available toolbox exists that guides the user through the difficulties of this powerful technique. TRENTOOL (the TRansfer ENtropy TOOLbox) fills this gap for the neurosciences by bundling data efficient estimation algorithms with the necessary parameter estimation routines and nonparametric statistical testing procedures for comparison to surrogate data or between experimental conditions. TRENTOOL is an open source MATLAB toolbox based on the Fieldtrip data format. ...
Background: In many species males face a higher predation risk than females because males display elaborate traits that evolved under sexual selection, which may attract not only females but also predators. Females are, therefore, predicted to avoid such conspicuous males under predation risk. The present study was designed to investigate predator-induced changes of female mating preferences in Atlantic mollies (Poecilia mexicana). Males of this species show a pronounced polymorphism in body size and coloration, and females prefer large, colorful males in the absence of predators. Results: In dichotomous choice tests predator-naïve (lab-reared) females altered their initial preference for larger males in the presence of the cichlid Cichlasoma salvini, a natural predator of P. mexicana, and preferred small males instead. This effect was considerably weaker when females were confronted visually with the non-piscivorous cichlid Vieja bifasciata or the introduced non-piscivorous Nile tilapia (Oreochromis niloticus). In contrast, predator experienced (wild-caught) females did not respond to the same extent to the presence of a predator, most likely due to a learned ability to evaluate their predators' motivation to prey. Conclusions: Our study highlights that (a) predatory fish can have a profound influence on the expression of mating preferences of their prey (thus potentially affecting the strength of sexual selection), and females may alter their mate choice behavior strategically to reduce their own exposure to predators. (b) Prey species can evolve visual predator recognition mechanisms and alter their mate choice only when a natural predator is present. (c) Finally, experiential effects can play an important role, and prey species may learn to evaluate the motivational state of their predators. Keywords: Sexual selection; female choice; non-independent mate choice; predator recognition; Poecilia mexicana
As a part of this thesis, a Monte Carlo-based code has been developed capable of simulating the transition of proton beam properties to neutron beam properties as it occurs in the Li-7(p, n)Be-7 reaction. It is able to reproduce not only the angle-integrated energy distributions but it is also capable of predicting the angle-dependent neutron spectra as measured at Forschungszentrum Karlsruhe (Karlsruhe, Germany) and Physikalisch-Technische Bundesanstalt (Braunschweig, Germany). Since the code retains all three spatial dimensions as well as all three velocity dimensions, it provides very detailed information on the neutron beam. The resulting data can aid in many different aspects, for example it can be used in shielding construction, or for lithium target design. In this work, the code is used to predict the neutron beam properties expected at the Frankfurt Neutron Source at Stern-Gerlach-Zentrum (FRANZ) facility. For different proton beam energies, the neutron distribution in x/p_x, y/p_y, and z/p_z is shown as well as a Mollweide projection, which illustrates the kinematic collimation effect that limits the neutron cone opening angle to less than 180 degree.
Die Familie der Proteorhodopsine (PR) besteht aus Hunderten von PR Molekülen, die unter Lichteinwirkung Protonen pumpen und somit eine bedeutende Rolle für die Energiegewinnung spielen könnten. Da der pKa Wert des Proton Akzeptors der Schiff‘schen Base (SB) (~7.2) dem pH Wertes der Ozeane (~7.9) ähnelt, wird auch über eine regulatorische Funktion spekuliert. Wird in Erwägung gezogen, dass 24 000 PR Moleküle pro SAR86 Zelle vorhanden sind (Beja et al. 2001) und dass 13% der Bakterien der Meeresoberfläche PR besitzen (Sabehi et al. 2005) liefert dieses Protein wahrscheinlich einen bedeutenden Energiebeitrag neben der Photosynthese. Einblicke in den Mechanismus der Energieumwandlung erfordern sowohl die Untersuchung des Chromophores, welches die Lichtenergie absorbiert als auch der Struktur des Apoproteins, das durch die Generierung eines Protonengradienten zur Energiegewinnung beiträgt. Der Fokus der Doktorarbeit liegt auf dem Chromophor und seiner Umgebung. Eine erste Charakterisierung der SB und des Retinals erfolgt durch UV/VIS und NMR Messungen (Pfleger et al. 2008). Die 13C chemische Verschiebungen von 10,11-13C2 Retinal und die 15N chemische Verschiebung der protonierten SB, gebildet durch K231, zeigt eindeutig, dass im Grundzustand nur eine Konformation der Retinals, all-trans, vorliegt. Die 15N chemische Verschiebung weist außerdem auf eine starke Wechselwirkung der SB mit ihren Gegenionen hin. Desweiteren kann durch Messungen der 15N chemischen Verschiebung der SB bei verschiedenen pH Werten der pKa Wert der SB abgeschätzt werden, auf ~12. Diese Stabilisierung der positiv geladenen protonierten Form der SB weist auf die Existenz eines Wasserclusters hin, das durch die hohe Dielektrizitätskonstante die protonierte Form der SB stabilisieren könnte. Um zu überprüfen, ob Wasser an der SB gebunden ist, wird ein sogenanntes 15N-1H HETCOR Experiment durchgeführt. Der Bereich der 15N chemischen Verschiebung der SB korreliert mit einer Protonenresonanz bei ~5 ppm, welche im Bereich einer Wasserresonanz liegt und die durch D2O austauschbar ist. Dies indiziert eine wichtige Bedeutung von Wasser in der Nähe der SB für die Funktion von PR. Der Einfluss von Mutationen des Histidins H75 und des Aspartats D97 auf die 15N chemische Verschiebung der SB sowie die Auswirkung von Histidinmutationen auf das Chromophor deuten eine direkte Wechselwirkung von Aspartat 97 und der SB an, nicht aber eine direkte Wechselwirkung von H75 und der SB. Neben dem Chromophor ist außerdem das Signalpeptid Gegenstand der Untersuchung der Doktorarbeit. Motivation für die Untersuchung war die Inhomogenität der Proben, die im Zusammenhang mit ungleich prozessiertem PR stehen könnten. Ein zweiter Teil beschäftigt sich mit neuen Konzepten der Datenaufnahme, da das S/R in der Festkörper NMR ein limitierender Faktor darstellt. Diese beinhalten Verstärkung der Relaxation (RELOAD) sowie die Refokussierung von T2 bei Verwendung eines Prozessierungsschrittes, der „half echo alternating transformation“ (HEAT).
In mitochondrial respiration, the soluble protein cytochrome c accepts an electron from the membrane bound cytochrome bc1. The interaction between cytochrome bc1 and cytochrome c is highly transient in nature, enabling turnover numbers greater than 160 s-1. Yeast cytochrome bc1 has been successfully crystallised with bound cytochrome c with the help of an antibody fragment (Lange and Hunte 2002; Solmaz and Hunte 2008). In all crystal structures of the complex, the homodimeric cytochrome bc1 binds only one cytochrome c, with the binding site located on subunit cytochrome c1. Univalent cytochrome c binding is correlated with conformational changes of the Rieske protein head domain and subunit QCR6p. The interface of the complex is small. The haem moieties are centrally located in a mainly non-polar contact site that includes a cation–! interaction and is surrounded by complementary charged residues. The crystal structure is in agreement with the general architecture of the interfaces of transient redox complexes and also reveals several interesting features unique to the cytochrome bc1. On the basis of the crystal structures, an extensive thermodynamic and kinetic characterisation of the interaction was carried out in this work to challenge the static snapshot of the bound proteins in the crystal structure as the relevant physiological electron transfer. The thermodynamic parameters of the interaction between the redox partners were determined using isothermal titration calorimetry (ITC). The association constant for cytochrome bc1 and cytochrome c in oxidised state under physiological ionic strength of 120 mM at 25 °C, was determined to be 5 " 103 M-1 by direct ITC titration. So, the partners interact with an affinity of 200 #M. In spite of the low affinity the complex has a life time ($ = 1/koff) of 5 #second, sufficiently long to enable the theoretically calculated electron transfer rates of 1.0 " 106 to 2.6 " 107 s%1 with a lifetime ($ = 1/rate) of 1-0.04 μseconds and experimentally determined rate of 7.7 " 104 s%1 with a lifetime of 13 μseconds. The low affinity makes it difficult to ascertain the stoichiometry of binding. The enthalpy of the interaction is endothermic, which is consistent with the nature of an interface where hydrophobic interactions are dominant. The enthalpy and entropy is 3.6 kJmol-1 and 83 kJmol-1K-1, respectively. The importance of key interface residues was also investigated. The role of the interface residue G89 of cytochrome c which might have a role in the dissociation of the complex has been probed by site-directed mutagenesis. The interface contains a cation-! interaction between F230 of cytochrome bc1 and R19 of cytochrome c, which is thought to provide the specificity to the interaction between the otherwise promiscuous partners. To analyse the role of this interaction pair in electron transfer, F230L and F230W mutants were used to measure direct electron transfer rates by flash photolysis and steady state kinetics. The findings indicate that another ! system can work as functional substitution of F230, while deleting the ! system has a deleterious effect on the complex formation. The inability of F230L to achieve the transient and steady state turnover rates as wild type protein indicates a scenario where the variant achieves an altered bound state with inefficient electron transfer pathways and higher edge-to-edge distance. The role of supernumerary subunit QCR6p in complex formation was investigated by steady state kinetics measurements. Subunit QCR6p does not interact directly with cytochrome c but is positioned in such a way that it could electrostatically steer cytochrome c in a reactive ensemble. The highly acidic and disordered N-terminus of QCR6p could interact with a patch of conserved lysine residues on cytochrome c. The role of subunit QCR6p has been assessed using QCR6p deleted cytochrome bc1 and a lysine variant of cytochrome c. The results show that QCR6p not only affects the kinetics of the interaction but is also important for the stability of cytochrome bc1. The kinetic and thermodynamic data obtained during this study provide evidence for the functional importance of non-catalytic cytochrome bc1 subunit QCR6p, show that the entropy driven interaction is indeed of low affinity and highly transient in nature and indicate that the interface is well suited to ensure the high turnover of the electron transfer chain where cytochrome c interacts with multiple partners using overlapping interfaces. The suggested role of the cation-! interaction as a highly specific interaction has been validated.
This thesis is based on the following publications (in chronological order): 1. Biegel, E., S. Schmidt & V. Müller (2009) Genetic, immunological and biochemical evidence for a Rnf complex in the acetogen Acetobacterium woodii. Environ. Microbiol. 11: 1438-1443. My contribution: Amplification, sequence determination and analysis of Rnf homologues, enrichment of the Rnf complex 2. Biegel, E. & V. Müller (2010) Bacterial Na+-translocating ferredoxin:NAD+ oxidoreductase. Proc. Nat. Acad. Sci. U. S. A. 107: 18138-18142. My contribution: I designed and performed all experiments shown and interpreted the data. 3. Biegel, E., S. Schmidt, J. Gonzáles & V. Müller (2010) Biochemistry, evolution and physiological function of the Rnf complex, a novel ion-motive electron transport complex in prokaryotes. Cell. Mol. Life Sci., in press. DOI: 10.1007/s00018-010-0555-8. My contribution: I was involved in writing all chapters except chapters: „phylogenetic analyses of rnf genes“ and „distribution of rnf genes“. 4. Biegel, E. & V. Müller (2010) A Na+-translocating pyrophosphatase in the acetogenic bacterium Acetobacterium woodii. J. Biol. Chem., in press. DOI: 10.1074/jbc.M110.192823. My contribution: I designed and performed all experiments shown and interpreted the data.