Universitätspublikationen
Refine
Year of publication
- 2018 (2128) (remove)
Document Type
- Article (1060)
- Doctoral Thesis (204)
- Contribution to a Periodical (172)
- Part of Periodical (157)
- Working Paper (127)
- Book (117)
- Preprint (75)
- Review (74)
- Part of a Book (60)
- Conference Proceeding (45)
Language
Is part of the Bibliography
- no (2128)
Keywords
- Financial Institutions (17)
- breast cancer (15)
- Macro Finance (12)
- Ausstellung (10)
- Financial Markets (10)
- Mammakarzinom (10)
- Alte Geschichte (9)
- Systemic Risk (9)
- Banking Union (8)
- Behandlung (8)
Institute
- Medizin (520)
- Präsidium (304)
- Physik (223)
- Wirtschaftswissenschaften (176)
- Sustainable Architecture for Finance in Europe (SAFE) (128)
- Gesellschaftswissenschaften (115)
- Biowissenschaften (106)
- Center for Financial Studies (CFS) (101)
- Frankfurt Institute for Advanced Studies (FIAS) (97)
- Neuere Philologien (89)
Objective: The present study aims to elucidate the state of gender equality in high-quality dermatological research by analysing the representation of female authorships from January 2008 to May 2017.
Design: Retrospective, descriptive study.
Setting: 113 189 male and female authorships from 23 373 research articles published in 23 dermatological Q1 journals were analysed with the aid of the Gendermetrics Platform.
Results: 43.0% of all authorships and 50.2% of the firstauthorships, 43.7% of the coauthorships and 33.1% of the last authorships are held by women. The corresponding female-to-male ORs are 1.41 (95% CI 1.37 to 1.45) for first authorships, 1.07 (95% CI 1.04 to 1.10) for coauthorships and 0.60 (95% CI 0.58 to 0.62) for last authorships. The annual growth rates are 1.74% overall and 1.45% for first authorships, 1.53% for coauthorships and 2.97% for last authorships. Women are slightly under-represented at prestigious authorships compared with men (Prestige Index=−0.11). The under-representation remains stable in highly competitive articles attracting the highest citation rates, namely, articles with many authors and articles that were published in highest-impact journals. Multiauthor articles with male key authors are only slightly more frequently cited than those with female key authors. Women publish slightly fewer papers compared with men (47.2% women hold 43.0% of the authorships). At the level of individual journals, there is a high degree of uniformity in gender-specific authorship odds. By contrast, distinct differences at country level were revealed. The prognosis for the next decades forecasts a consecutive harmonisation of authorship odds between the two genders.
Conclusions: In high-quality dermatological research, the integration of female scholars is advanced as compared with other medical disciplines. A gender gap consists mainly in the form of a career dichotomy, with many female early career researchers and few women in academic leadership positions. However, this gender gap has been narrowed in the last decade and will likely be further reduced in the future.
In the context of limited donor pool in cardiothoracic transplantation, utilization of organs from high risk donors, such as suicidal hanging donors, while ensuring safety, is under consideration. We sought to evaluate the outcomes of lung transplantations (LTx) that use organs from this group.
Between January 2011 and December 2015, 265 LTx were performed at our center. Twenty-two recipients received lungs from donors after suicidal hanging (group 1). The remaining 243 transplantations were used as a control (group 2). Analysis of recipient and donor characteristics as well as outcomes was performed.
No statistically significant difference was found in the donor characteristics between analyzed groups, except for higher incidence of cardiac arrest, younger age and smoking history of hanging donors (P < .001, P = .022 and P = .0042, respectively). Recipient preoperative and perioperative characteristics were comparable. Postoperatively in group 1 there was a higher incidence of extracorporeal life support (27.3 vs 9.1%, P = .019). There were no significant differences in chronic lung allograft dysfunction-free survival between group 1 and 2: 92.3 vs 94% at 1 year and 65.9 vs 75.5% at 3 years (P = .99). The estimated cumulative survival rate was also similar between groups: 68.2 vs 83.2% at 1 year and 68.2% versus 72% at 3 years (P = .3758).
Hanging as a donor cause of death is not associated with poor mid-term survival or chronic lung allograft dysfunction following transplantation. These results encourage assessment of lungs from hanging donors, and their consideration for transplantation.
Das menschliche Leben erscheint heute als in vielfältiger Weise mit seiner Umwelt verbunden. Bio- und neurowissenschaftliche Forschungen über die Interaktionsweisen mit der Umwelt verändern dabei das Bild des Körpers von einem hierarchisch aufgebauten Organismus zu einem organisch-kognitiv-verteilten Netzwerk. Nicht zuletzt Forschungen zur künstlichen Intelligenz haben gezeigt, dass das menschliche Gehirn nicht isoliert betrachtet werden kann, sondern verkörpert, vernetzt und damit in einer wechselwirkenden Abhängigkeit zu Körpern steht (embedded und extended mind). Epigenetische Forschungen haben ebenfalls auf die Umweltabhängigkeit auch genetischer Prozesse verwiesen (Postgenomik) und damit auf komplexe Wechselwirkungen zwischen Biotischem und Abiotischem aufmerksam gemacht. Diese komplexen Wechselwirkungen und Umweltabhängigkeiten zwischen Lebendigem und Nicht-Lebendigem werden inzwischen zusehends zum Gegenstand menschlicher Selbstorganisation. Sie tauchen in veränderter Form in den Plänen zu den sogenannten Industrien 4.0 auf, wenn es darum geht, intelligente Umgebungen mit dem Menschen interaktiv zu vernetzen. Die hierfür notwendigen digitalen Datenmengen stehen aber nur zur Verfügung, wenn Menschen sich aktiv vernetzen. Die Entstehung digitaler Daten- körper wird dadurch zu einem essentiellen Bestandteil sozialer Teilhabe, wodurch Soziales zum entwicklungsoffenen und unbestimmten Prozess wird. Wie sich Menschen wann und wo vernetzen, ist nicht vorherbestimmt. Digitalisierung ist dabei, so die These der Arbeit, sich zur grundlegenden Praxis menschlicher Vernetzung zu entwickeln.
Die Arbeit geht Digitalisierung aus einer Perspektive koevolutionärer Entstehungs- und Entwicklungszusammenhänge nach und zeigt, dass digitale Praxen zu einer neuen Form menschlicher Selbstorganisation weltweit geworden sind. Angesprochen wird damit, dass Digitalisierung nicht als etwas dem Menschen Äußerliches betrachtet werden kann, sondern in einen größeren kulturellen Entstehungszusammenhang eingebettet werden muss, der bis zu den Anfängen der Menschheit zurückreicht. Um dies zu veranschaulichen, werden in der Arbeit drei verschiedene Wissensformationen benannt, die sich jeweils in unterschiedlicher Art und Weise mit den aktuellen Veränderungen digitalisierter Lebenswelten auseinandersetzen.
Die erste Wissensformation (Kapitel 2) benennt den Humanismus, der im Aufkommen neuer Medientechnologien eine Bedrohung für den Menschen sieht. Eine zweite Wissensformation (Kapitel 3) widmet sich dem „Ende des Humanismus“, indem Ansätze der Science and Technology Studies (STS), der Akteur-Network-Theory (ANT) und des Agentiellen Realismus von Karan Barad diskutiert werden. Mit einer „neuen Ökonomie für eine neue Menschheit“ wird eine dritte Wissensformation (Kapitel 4) benannt, die, von postoperaistischen Ansätzen ausgehend, die These eines „dritten“ oder „kognitiven Kapitalismus“ diskutiert. Hier geht es um die These des Zusammenfallens von Ökonomischem und Sozialem, aus dem neue offene Sozialformationen entstehen. Schließlich wird eine vierte Wissensformation (Kapitel 5) formuliert, die, ausgehend vom Ansatz einer Anthropologie des Medialen (AdM) und dem Modell der Erweiterung kultureller Kapazitäten (EECC) versucht, die als digitalen Wandel bezeichneten Veränderungen in einen größeren Zusammenhang zu stellen.
Mit beiden Ansätzen kann schließlich gezeigt werden, dass sich Veränderungen menschlicher Selbstorganisation immer in der biologischen, individuellen, kulturellen und historisch-sozialen Entwicklungsdimension zugleich vollziehen. Dies lässt sich auch für die Prozesse der Digitalisierung zeigen. Nämlich, dass sich der Mensch als Teil der Natur in einem fortwährenden koevolutionären Prozess befindet. Weder Kultur, noch Soziales, noch Technologien sind unnatürlich. Sie können als „indirekte Biologie“, als „Künstliches“ oder als „Kultur der Biologie“ bezeichnet werden, die der Natur aber nie entkommen. Die Erweiterung kultureller Kapazitäten ist deshalb nicht als eine Ausdehnung des Menschen in die Natur hinaus zu verstehen, sondern bezeichnet die im Laufe der Menschheitsgeschichte komplexer werdenden Reichweiten und Zeittiefen menschlicher Selbstorganisation, die immer auf den drei Ebenen von Phylogenese, Ontogenese, Technogenese und der damit verbundenen Soziogenese basieren.
This study aimed to appraise two quantitative magnetic resonance imaging techniques, T2* imaging and diffusion-weighted imaging (DWI), for the diagnosis of the intervertebral disc degeneration of the cervico-thoracic junction. Influence of specific factors and diagnostic accuracy of both techniques were particularly explored. Sixty-one volunteers with neck and upper back pain were recruited and evaluated with both T2* imaging and DWI. The Pfirrmann grade, T2* relaxation time and apparent diffusion coefficient (ADC) value of each disc between C7 and T3 were recorded. Stratified analyses were performed for different anatomic levels, genders, age ranges and Pfirrmann grades. The diagnostic accuracy of both techniques was investigated using the receiver operating characteristic (ROC) curves. No statistically significant difference of either T2* relaxation time or ADC value was detected between males and females. Both parameters decreased with the increasing age and Pfirrmann grade. The ROC curves showed the higher sensitivity and specificity for T2* imaging than DWI to quantitatively identify the disc degeneration. Particularly, T2* imaging allowed for a quantitative distinguishing the normal, mild and moderate disc degeneration from the severe degeneration, which was unable to accomplish with DWI. In conclusion, we demonstrated that T2* imaging possess a better accuracy than DWI to quantitatively diagnose the intervertebral disc degeneration at the cervico-thoracic junction.
Perception, particularly in the visual domain, is drastically influenced by rhythmic changes in ambient lighting conditions. Anticipation of daylight changes by the circadian system is critical for survival. However, the neural bases of time-of-day-dependent modulation in human perception are not yet understood. We used fMRI to study brain dynamics during resting-state and close-to-threshold visual perception repeatedly at six times of the day. Here we report that resting-state signal variance drops endogenously at times coinciding with dawn and dusk, notably in sensory cortices only. In parallel, perception-related signal variance in visual cortices decreases and correlates negatively with detection performance, identifying an anticipatory mechanism that compensates for the deteriorated visual signal quality at dawn and dusk. Generally, our findings imply that decreases in spontaneous neural activity improve close-to-threshold perception.
Ideally located in the writer's position of the voice "contractus (& quasi contractus)" of the Dictionary, the author of this paper tries to discover the difficulties that his drafting could imply. The difficulties encountered come mainly from the chronology and the diversity of profiles between the members of the Salamanca School that deal with contracts, from the unusual historical and material extension of the elements they work with and from the need to understand their methods, their initial assumptions and the aims they pursue. At the end, some practical considerations are offered to the voice's drafting.
Reconstructing the evolution of baleen whales (Mysticeti) has been problematic because morphological and genetic analyses have produced different scenarios. This might be caused by genomic admixture that may have taken place among some rorquals. We present the genomes of six whales, including the blue whale (Balaenoptera musculus), to reconstruct a species tree of baleen whales and to identify phylogenetic conflicts. Evolutionary multilocus analyses of 34,192 genome fragments reveal a fast radiation of rorquals at 10.5 to 7.5 million years ago coinciding with oceanic circulation shifts. The evolutionarily enigmatic gray whale (Eschrichtius robustus) is placed among rorquals, and the blue whale genome shows a high degree of heterozygosity. The nearly equal frequency of conflicting gene trees suggests that speciation of rorqual evolution occurred under gene flow, which is best depicted by evolutionary networks. Especially in marine environments, sympatric speciation might be common; our results raise questions about how genetic divergence can be established.
Diagnostic approaches for invasive aspergillosis—specific considerations in the pediatric population
(2018)
Invasive aspergillosis (IA) is a major cause of morbidity and mortality in children with hematological malignancies and those undergoing hematopoietic stem cell transplantation. Similar to immunocompromised adults, clinical signs, and symptoms of IA are unspecific in the pediatric patient population. As early diagnosis and prompt treatment of IA is associated with better outcome, imaging and non-invasive antigen-based such as galactomannan or ß-D-glucan and molecular biomarkers in peripheral blood may facilitate institution and choice of antifungal compounds and guide duration of therapy. In patients in whom imaging studies suggest IA or another mold infection, invasive diagnostics such as bronchoalveolar lavage and/or bioptic procedures should be considered. Here we review the current data of diagnostic approaches for IA in the pediatric setting and highlight the major differences of performance and clinical utility of the tests between children and adults.
Background: Anger and aggression belong to the core symptoms of borderline personality disorder. Although an early and specific treatment of BPD is highly relevant to prevent chronification, still little is known about anger and aggression and their neural underpinnings in adolescents with BPD.
Method: Twenty female adolescents with BPD (age 15–17 years) and 20 female healthy adolescents (age 15–17 years) took part in this functional magnetic resonance imaging (fMRI) study. A script-driven imagery paradigm was used to induce rejection-based feelings of anger, which was followed by descriptions of self-directed and other-directed aggressive reactions. To investigate the specificity of the neural activation patterns for adolescent patients, results were compared with data from 34 female adults with BPD (age 18–50 years) and 32 female healthy adults (age 18–50 years).
Results: Adolescents with BPD showed increased activations in the left posterior insula and left dorsal striatum as well as in the left inferior frontal cortex and parts of the mentalizing network during the rejection-based anger induction and the imagination of aggressive reactions compared to healthy adolescents. For the other-directed aggression phase, a significant diagnosis by age interaction confirmed that these results were specific for adolescents.
Discussion: The results of this very first fMRI study on anger and aggression in adolescents with BPD suggest an enhanced emotional reactivity to and higher effort in controlling anger and aggression evoked by social rejection at an early developmental stage of the disorder. Since emotion dysregulation is a known mediator for aggression in BPD, the results point to the need of appropriate early interventions for adolescents with BPD.
Die vorliegende Arbeit befasst sich damit, wie die spezifische Durchführung eines besonderen psychologischen Laborexperiments in eine allgemeine, kausale Form übersetzt wird. Anstatt dazu formale Kriterien der Validität heranzuziehen, wird ein experimenteller Forschungsprozess ethnographisch begleitet.
Forschungsgegenstand ist ein Verhaltensexperiment aus der allgemeinen Psychologie zur Trainierbarkeit des Arbeitsgedächtnisses. Im Rahmen der Ethnographie werden teilnehmende Beobachtungen, Interviews und Dokumentensammlung kombiniert eingesetzt. Die Auswertung der Materialien erfolgt mithilfe der Situationsanalyse nach Clarke (2012), einer qualitativen Auswertungsmethode im Anschluss an die Grounded Theory.
In dieser Arbeit wird das Verhalten der Versuchsperson ins Zentrum gerückt, das die Messung in Gang setzt und hält und die Entstehung von zahlenförmigen Daten ermöglicht. Dazu wird in Orientierung an neueren Science & Technology Studies eine begriffliche Systematisierung der Experimentalpraxis aus dem empirischen Material herausgearbeitet, mit dem die Konstruktion und Transformation des Verhaltens der Versuchsperson im Verlauf des Datenerhebungs- Auswertungs- und Interpretationsprozesses beschrieben werden kann.
Die Ergebnisse der Ethnographie legen nahe, dass dieses Verhalten der Versuchsperson - korrespondierend zum kausal verfassten Endprodukt des Experiments - von der komplexen Erhebungssituation abhängig und paradoxerweise gleichzeitig unabhängig ist. Damit wird in Anlehnung an Latour (2002) zwischen konstruktivistischen und objektivistischen Positionen vermittelt. Zudem weisen die erforschten Praktiken die epistemische Stellung der Versuchsperson aus. Diese wird im Anschluss an die Terminologie von Rheinberger (2001/ 2006) als Mischform von epistemischem Ding (Neues) und technischem Ding (Bekanntes) bestimmt.
G-protein coupled receptors (GPCRs) are a predominant class of cell-surface receptors in eukaryotic life. They are responsible for the perception of a broad range of ligands and involved in a multitude of physiological functions. GPCRs are therefore of crucial interest for biological and pharmaceutical research. Molecular analysis and functional characterisation of GPCRs is frequently hampered by challenges in efficient large-scale production, non-destructive purification and long-term stability. Cell-free protein synthesis (CFPS) provides new production platforms for GPCRs by extracting the protein synthesis machinery of the cell in an open system that allows target-oriented modulations of the synthesis process and direct access to the nascent polypeptide chain. CFPS is fast, reliable and highly adaptable. Unfortunately, highly productive cell-free synthesis of GPCRs is often opposed by low product quality. This thesis was aimed to adapt and improve some of the new possibilities for the cell-free production of GPCRs in high yield and quality for structural and pharmaceutical analysis. An E. coli based CFPS system was applied to synthesise various turkey and human Beta-adrenergic receptor (Beta1AR) derivatives as well as human Endothelin receptors type A and B (ETA and ETB) constructs. Both receptor families are important drug targets and pharmacologically addressed in the treatment of several cardiovascular diseases. CF-synthesis was mainly performed in presence of nanodiscs (ND), which are reconstituted high density lipoprotein particles forming discoidal bilayer patches with a diameter varyring from 6 to approx. 15 nm. The supplementation of ND in the CF-synthesis reaction caused the co-translational solubilisation of the freshly synthesised GPCRs. The fraction of the solubilised GPCR that was correctly folded was analysed by the competence to bind its ligand alprenolol or Endothelin-1, respectively. Both the solubilisation efficiency and the ability to fold in a ligand binding competent state was strongly affected by the lipid composition of the supplied ND. Best results were generally achieved with lipids having phosphoglycerol headgroups and unsaturated fatty acid chains with 18 carbon atoms. Furthermore, thermostabilisation by introduction of point mutations had a large positive impact on the folding efficiency of both Beta1AR and ETB receptor. Formation of a conserved disulphide bridge in the extracellular region was additionally found to be crucial for the function of the ETB receptor. Disulphide bridge formation could be enhanced by applying a glutathione-based redox system in the CFPS. Further improvements in the quality of ETB receptor could be made by the enrichment of heat-shock chaperones in the CF-reaction. Depending on the receptor type and DNA-template, roughly 10 – 30 nmol (350 – 1500 µg) of protein could be synthesised in 1 ml of CF-reaction mixture. After the applied optimisation steps, the fractions of correctly folded receptor could be improved by several orders of magnitude and were finally in between 35% for the thermostabilised turkey Beta1AR, 9% for the thermostabilised ETB receptor, 6.5% for the non-stabilised ETB receptor, 1 - 5% for non-stabilised turkey Beta1AR and for human Beta1AR isoforms and 0.1% for ETA receptor. Therefore, between 2 and 120 µg of GPCR could be synthesised in a ligand binding competent form, depending on the receptor and its modifications. Correctly folded turkey Beta1AR and ETB receptors were thermostable at 30°C and could be stored at 4°C for several weeks after purification. Yields of the thermostabilised turkey Beta1AR were sufficient to purify the receptor in a two-step process by ligand-binding chromatography to obtain pure and correctly folded receptor in the lipid bilayer of a ND. Furthermore, a lipid dependent ligand screen could be demonstrated with the turkey Beta1AR and significant alterations in binding affinities to currently in-use pharmaceuticals were found. The established protocols are therefore suitable and highly competetive for a variety of applications such as screening of GPCR ligands, analysis of lipid effects on GPCR function or for the systematical biochemical characterisation of GPCRs. Most promising for future approaches appears to address the suspected bottlenecks of intial insertion of the GPCR-polypeptide chain in the ND bilayer and the thermal stability of the receptors. Nevertheless, the estabilised protocols for the analysed targets in this thesis are already highly competitive to previously published production protocols either in cell-based or cell-free systems with regard to yield of functional protein, speediness and costs. Moreover, the direct accessibility and other general characteristics of cell-free synthesis open a large variety of possible applications and this work can therefore contribute to the molecular characterisation of this important receptor type and to the development of new pharmaceuticals.
An die Soziologie werden zunehmend Fragen des ökonomischen Nutzens und der gesellschaftlichen Relevanz herangetragen. Ein Wissen um den gesellschaftlichen Impact soziologischen Wissens und die Artikulation eines Nutzens für die Praxis sind wertvolle Werkzeuge im Kampf um die Alimentation soziologischer Forschung. Aber wie wird soziologisches Wissen überhaupt angewendet? Um diese Frage zu beantworten, wird soziologisches Wissen definiert und dessen Anwendung expliziert. Unter Zuhilfenahme von Wissenschaftstheorie und Wissenssoziologie wird zunächst eine Definition erarbeitet. Anschließend werden Forschungsgebiete, die sich mit der Anwendung von (soziologischen) Wissen beschäftigen, vorgestellt – allen voran die soziologische Verwendungsforschung. Darauf aufbauend wird eine Explikation der Anwendung soziologischen Wissens erarbeitet, vor dessen Hintergrund aktuelle Bemühungen, soziologisches Wissen stärker anzuwenden, betrachtet werden. Die abschließende Diskussion beschäftigt sich mit den Möglichkeiten und Restriktionen der Anwendung soziologischen Wissens und betont die Rolle der Soziologie als kritische gesellschaftliche Aufklärungsinstanz.
Trotz aller Unsicherheit und kritischer Infragestellung sind Kunstlandschaftsbezeichnungen – und damit auch der „Mittelrhein“ – als Hilfsbegriffe für die Lokalisierung der Kunstwerke noch immer gebräuchlich. Aber es ist ganz besonders problematisch, vom Mittelrhein um 1500 als „Kunstlandschaft“ zu sprechen. Schon die Umgrenzung der Region fällt unterschiedlich aus, und noch mehr sind die Kriterien schwankend, die im Vergleich zu anderen Regionen den Mittelrhein definieren sollen. Vorherrschend sind bei solchen Vergleichen nach wie vor Stilbegriffe, welche Vorbehalte gegenüber dem Begriff des Stils auch geäußert werden. So ist die Frage, ob die für den Mittelrhein vorgeschlagene Kennzeichnung „Stilheterogenität“ als Kriterium der Abgrenzung tauglich ist oder mehr eine methodische Verlegenheitslösung darstellt.
Die Untersuchung konzentriert sich auf das Schnitzretabel, das als Leitmedium der spätgotischen Kunst im deutschsprachigen Raum zu betrachten ist. Die analysierten Schnitzretabel sind als Fallstudien anzusehen, wobei hier vor allem jene analysiert worden sind, die einen guten Erhaltungszustand aufweisen. Zwar haben die wenigsten ihr ursprüngliches Aussehen bewahrt, aber entweder sind die Veränderungen nur minimal oder der originale Zustand ist gut rekonstruierbar, sodass die Werkgruppe trotz der Eingriffe als repräsentativ gelten kann. Neben den traditionellen Untersuchungsmethoden konnte die Infrarotreflektographie mit beweglicher Kamera (Osiris) eingesetzt werden. Es soll mit der Vorstellung einer Gattung ein Ausschnitt der in der Region präsenten Kunst ohne „mittelrheinische Vorentscheidungen“ gezeigt werden.
Die meisten analysierten Retabel entstammen der Rhein-Main-Region mit Frankfurt und Mainz als Oberzentren des Mittelrheins; Oberwesel, Speyer und Gelnhausen markieren die Grenze für die Auswahl. Die 27 Einzeluntersuchungen finden sich im Katalogteil der Arbeit, während deren zusammenfassende Darstellung – im Hinblick auf Methode, Standort, Auftraggeber, Künstler, Retabeltyp, Bildprogramm sowie Einflüsse – sowie Ergebnisse im Hauptteil besprochen werden.
The article is designed to introduce and analyze authoritarian constitutionalism as an important phenomenon in its own right, not merely a deficient or deviant version of liberal constitutionalism. Therefore it is not adequate to dismiss it as sham or window-dressing. Instead, its crucial features – participation as complicity, power as property and the cult of immediacy – are related to the basic assumption that authoritarian constitutions are texts with a purpose that warrant careful analysis of the domestic and transnational audience.
This dissertation discusses the mutual influence between leaders and followers on perception, emotion and behavior, using an attachment theory perspective. Some individuals are more likely to be seen as leaders than others. On the one hand this is determined by the characteristics or attributes as well as skills of the person in question. However, on the other hand, followers’ perception and expectations play a big role as well, in particular which expectations of an ideal leader can be fulfilled by followers’ current leader. Although attachment theory and – styles have only recently entered the organizational psychology literature, this dissertation advances that literature by looking at the role of attachment orientations between leaders and followers. In doing so, this dissertation answers several recent research calls on this topic. The three main subsequent chapters discuss the predictive role of attachment orientations with regard to leader preferences, the transference of behavioural expectations from one leader to another, and the perception of leader prototypicality in groups. The first chapter discusses the connection between implicit leader preferences and attachment orientations as predictors. Results show that avoidant attached individuals prefer a more autonomous and independent leadership style, whereas anxious attached individuals prefer a supportive and team-oriented leadership style. In the second chapter I study the transference of behavioural expectations from one leader to another. Results show that avoidant attached individuals are more likely to engage in this transference process. In addition, I discuss and empirically test the influence of culture with regard to leader transference. In the final chapter, I examine the behavioural influence of attachment orientations on how likely someone is perceived to be a leader in groups. Based on 57 project groups, I find that team members actually perceive avoidant attached individuals to be the most leader-like. Put differently, given certain environmental conditions, insecure attachment orientations can be perceived as leaders. These results show that it is even more important that leaders somewhat adapt to their followers’ preferences and not commit to merely one particular leadership style.
Cells within a tissue form highly complex, cellular interactions. This architecture is lost in two-dimensional (2D) cell cultures. To close the gap between 2D cell cultures and in vivo tissues, three-dimensional (3D) cell cultures such as spheroids or embryoid bodies were developed. To fully take advantage of the third dimension, imaging techniques are essential. The emerging field of "image-based systems biology" exploits the information in images and builds a connection between experimental and theoretical investigation of biological processes. Such interdisciplinary approaches strongly depend on the development of protocols to establish 3D cell cultures, innovations in sample preparation, well-suited imaging techniques and quantitative segmentation methods.
Although 3D cell cultures and image-based systems biology provide a great potential, 2D methods are still not completely replaced by 3D methods. This is mainly due to methodical and technical hurdles. Therefore, this thesis provides a significant contribution to overcome these hurdles and to further develop 3D cell cultures. I established computational and experimental methods related to 3D aggregates and investigated fundamental, cellular processes such as adhesion, growth and differentiation.
The automatic segmentation method "PAS" and "LoS" were developed in the context of this thesis. They extract essential biological properties such as the projected area or features of cell nuclei from 2D or 3D images of 3D aggregates. Both algorithms show their accuracy robustly over image data from different samples and different microscopes. In addition, the superior performance of PAS and LoS was proven in a comparison with state-of-the-art methods.
The PAS approach served as an essential basis for investigating cellular processes such as adhesion and growth which are tightly regulated to contribute to tissue integrity. These processes are involved in the formation of spheroids. The temporally resolved data of spheroid formation of three mammary epithelial cell lines revealed differences in their formation dynamics as well as in the onset of spheroid formation phases (aggregation, compaction and growth). Despite these differences, adhesion- and growth-associated proteins such as E-cadherin, actin, microtubules, and the focal adhesion kinase show similar importance in a particular phase. Notably, certain proteins (e.g. E-Cadherin) contribute differently to spheroid formation of cells from different cell types in terms of cell adhesion and growth. Overall, analyses of the individual phases of spheroid formation revealed the temporal coordination of fundamental tissue-specific processes. The results contribute to a better understanding of the maintenance and disruption of tissue integrity.
An important but yet unknown process is how cells accomplish to arrange themselves against the gravitational force to form a spheroid. Live imaging with light sheet-based microscopy provides the best solution for a temporally and in particular spatially resolved investigation of spheroid formation. Although the imaging possibilities increase with this particular microscopy technique, available sample preparation methods are rare. Therefore, I have significantly optimized "agarose beaker" as preparation method for 3D long-term imaging of spheroid formation. The data show that upward movement of the cells takes place early. This movement is initiated in the centre of the initially flat cell layer. Subsequently, the cells move from the periphery of the cell layer toward the centre. Cells rearrange within the spheroid which is followed by growth. It is very likely that 3D aggregates form by adopting an energetically favoured, spherical shape by increasing cell-cell or cell-matrix contacts.
Besides the knowledge gained from the examination of the self-assembly process in different contexts, fully formed cellular aggregates can serve as basis to investigate differentiation processes. Differentiation guide cell fate specification during early embryonic development (i.e. preimplantation) and is not fully understood yet. Due to the lack of an in vitro system for preimplantation, I have developed "blastoids". These are 3D multicellular aggregates of mouse embryonic stem cells which represent important phases of preimplantation and beyond. In qualitative and quantitative analyses, a strong similarity was proven between blastoids and the inner cell mass of in vivo mouse embryos. Further results strongly suggest that both, the cell number and the trophectoderm play a subordinate role for cell fate decision during preimplantation. Furthermore, 3D neighbourhood analyses have shown that both, blastoids and mouse embryos, do not show a random "salt-and-pepper" pattern during differentiation. Instead, they show a yet unknown local clustering of cells with identical fates, suggesting local cell interactions that influence cell fate decision. Furthermore, the data indicate that the maturation of the epiblast in the later stages of preimplantation is initiated by an interaction between cells of the epiblast and the primitive endoderm.
Using image-based systems biology, I have investigated fundamental cellular processes such as adhesion, growth and differentiation in the context of tissue integrity and early embryonic development using 3D cellular aggregates. This highly interdisciplinary work is a major contribution to 3D cell biology and demonstrates how cells bind and interact within a complex system. The main methods developed in this thesis as well as the biological findings can be used not only in further biological but also in medical and pharmacological studies. They have the potential to advance our understanding of complex biological systems and to provide new opportunities for practical applications.
Acute myeloid leukemia (AML) is a clonal malignancy of hematopoietic stem cells (HSCs) characterized by expansion of myeloid blasts in the bone marrow. It has been shown that autophagy is a degradative process, which delivers cytoplasmic components to lysosomes to prevent malignant transformation by maintaining HSC integrity. Besides its function as a bulk degradation machinery to recycle cytoplasmic components during limited energy supply, autophagy also serves as an intracellular quality control mechanism. Selective autophagy requires autophagy receptors such as p62 to specifically bridge the targeted cargos into autophagosomes. p62 is known as a central signaling hub involved in pro-oncogenic signaling pathways and autophagic degradation pathways. However, little is known about the role of p62 as a selective autophagy receptor in AML. This study aims to elucidate the precise function of p62 as an autophagy receptor in leukemia development and maintenance.
In silico analysis revealed that high p62 expression was significantly associated with poor overall survival of adult patients with de novo AML, suggesting that p62 may promote leukemia maintenance. To address the functional role of p62 in leukemia, genome editing by CRISPR/Cas9 was used to knockout p62 in four human AML cell lines. Importantly, p62 loss reduced cell proliferation in all four cell lines. This observation could be transferred to a murine leukemia cell model in which leukemic transformation of lineage-depleted bone marrow (ldMBM) cells was induced by overexpression of the human transcriptional coactivator MN1. Knockdown of p62 by shRNA in MN1-driven leukemia cells impaired proliferation and decreased colony forming ability without altering apoptosis. This indicates that p62 is crucial for leukemia proliferation in vitro. To further characterize the role of p62 in leukemia development and maintenance a murine AML transplantation model was established. Therefore, ldMBM cells isolated from WT and p62-/- mice were transduced with MN1 and transplanted into lethally irradiated mice. As expected, all mice developed fatal myeloid proliferation. Notably, p62 loss in MN1-driven leukemia significantly prolonged survival in mice and caused a more immature phenotype. Consistent with the in vitro results, ex vivo analysis of p62-/- leukemic cells displayed decreased colony-forming ability, although p62 loss did not affect composition and function of HSCs. Moreover, re-transplantation of primary MN1-driven leukemia cells attenuated leukemia progression upon p62 loss. These findings support a decisive role of p62 in leukemia development and maintenance.
To gain molecular insight into the function of p62 during myeloid transformation an interactome analysis of murine MN1-driven leukemia cells was performed. This revealed first that p62 predominantly interacts with mitochondrial proteins and second that inhibition of autophagic degradation causes accumulation of p62-bound mitochondria. This leads to the first assumption that loss of p62 may provoke mitochondrial accumulation with increasing mitochondrial damage and second that p62 may mediate degradation of mitochondria by mitophagy. Indeed, in the absence of p62, accumulation of dysfunctional mitochondria was detected by morphological changes of the mitochondria, increased mitochondrial ROS and impaired mitochondrial respiration capacity. Furthermore, induction of PINK1/Parkin-independent mitophagy revealed that loss of p62 caused impaired degradation of mitochondrial proteins and reduced translocation of damaged mitochondria into autophagosomes. Taken together, p62 is required for effective degradation of dysfunctional mitochondria by mitophagy in AML.
Due to the fact that p62 is a multifunctional protein, rescue experiments with different mutants of p62 were performed to clarify if p62-mediated mitophagy contributes to leukemia proliferation. Notably, the autophagy-deficient mutant (disabled to bind autophagosomes) reduced cell growth and colony-forming ability to the same extent as knockdown of p62, as the clustering-deficient mutant (disabled to form aggregates) displayed an intermediate phenotype. Strikingly, only the autophagy-deficient mutant failed to rescue mitophagy.
In conclusion, this study demonstrates the prominent role of p62 as a selective autophagy receptor for mitochondrial quality control which contributes to leukemia development and maintenance. Therefore, targeting selective autophagy opens new venues in the treatment of AML.
The pyrrolobenzodiazepine tilivalline (1) was originally identified in the human gut pathobiont Klebsiella oxytoca, the causative agent of antibiotic-associated hemorrhagic colitis. Here we show the identification of tilivalline and analogs thereof in the entomopathogenic bacterium Xenorhabdus eapokensis as well as the identification of its biosynthesis gene cluster encoding a bimodular non-ribosomal peptide synthetase. Heterologous expression of both genes in E. coli resulted in the production of 1 and from mutasynthesis and precursor directed biosynthesis 11 new tilivalline analogs were identified in X. eapokensis. These results allowed the prediction of the tilivalline biosynthesis being similar to that in K. oxytoca.
Im Kindes- und Jugendalter gehoert das Rhabdomyosarkom zu den haeufigsten Weichteilsarkomen. Bisher belaeuft sich das Therapieverfahren auf chirurgische Entfernung, gefolgt von Chemotherapie, bzw. bei nicht-operablen Faellen auf Radiotherapie und Chemotherapie, jedoch haben sich die Ueberlebenschancen fuer Patienten mit einer Erkrankung in metastasiertem oder rezidiviertem Stadium trotz intensiver Forschung ueber mehrere Jahrzehnte hinweg kaum gebessert und bleiben bei unter 30%. Neue therapeutische Strategien versuchen das Immunsystem des Patienten zu modulieren und dieses gezielter oder aggressiver gegen Tumorzellen zu machen. Nebst direkter Injektion von Zytokinen oder Antikoerpern bietet die adoptive Immunzelltherapie einen vielversprechenden Ansatz. In der vorliegenden Arbeit lag der Fokus auf Natuerlichen Killer- (NK) Zellen, da diese ein hohes zytotoxisches Potential gegenueber Tumorzellen aufweisen. Eine der groessten Herausforderungen der NK-Zellforschung ist die Breitstellung ausreichender Mengen an NK-Zellen mit optimaler antitumoraler Funktion fuer den klinischen Einsatz. Viele aktuell erprobte NK-Zellexpansionsstrategien basieren auf der Verwendung von Hilfs- oder Feeder-Zellen (Versorgerzellen), die jedoch vor der Applikation in Patienten aus dem finalen Produkt entfernt werden muessen. In der vorliegenden Arbeit sollten Feeder-zellfreie NK-Zellexpansionsprotokolle unter Verwendung von Gammakettenzytokinen getestet werden.
Interleukin (IL-) 15 erwies sich dabei vor allem fuer die Vermehrung der NK-Zellen als besonders foerderlich. Im Vergleich dazu fielen die Expansionsraten mit IL-2 oder IL-21 geringer aus. Interessanterweise wurde der expansionsfoerdernde Effekt von IL-15 durch dauerhafte Anwesenheit von IL-21 im Kulturmedium gehemmt. Ein kurzer, dreitaegiger IL-21-Boost am Ende der Expansionsphase wirkte sich wiederum positiv auf die NK-Zellexpansionsraten aus. Zudem zeigte sich durch IL-21 ein vermehrtes Auftreten von NK-Zellen des reiferen CD16posCD56dim Phaenotyps, der die zytotoxische Funktion vermittelt. Bei Degranulationsuntersuchungen wurden eine IL-21-induzierte Exozytoseaktivitaet und die vermehrte Ausschuettung von Perforin und Granzym B, welche Apoptose in den Zielzellen ausloesen, beobachtet. Vor allem der dreitaegige Boost mit IL-21 bewirkte eine gesteigerte Zytotoxizitaet gegenueber Tumorzellen, insbesondere gegenueber Rhabdomyosarkomzellen.
Auf dieser Grundlage bot es sich an fuer die NK-Zellexpansion ein Zwei-Phasen-Protokoll anzuwenden, bestehend aus einer initialen Proliferationsphase mit IL-15 und einem anschliessendem IL-21-Boost, durch den die antitumorale Funktionalitaet der NK-Zellen gesteigert wurde. Dieses IL-15+21boost-Protokoll wurde mit anderen Kombinationen aus den Gammakettenzytokinen IL-2, IL-15 und IL-21 verglichen und stellte sich hinsichtlich der NK-Zellexpansionsraten, der Degranulationskapazitaet und der damit verbundenen Zytotoxizitaet als den anderen Protokollen ueberlegen heraus.
Zytokinexpandierte NK-Zellen zeigten eine hoehere Rezeptorexpression an ihren Oberflaechen als unstimulierte Zellen. Die Expansion mit dem IL-15+21boost-Protokoll bewirkte die hoechste Dichte des Todesrezeptors TRAIL, jedoch auch der inhibitorischen KIR2D-Rezeptorfamilie. Fuer andere Oberflaechenmarker ergab sich jeweils eine mittlere Expressionsdichte verglichen mit dem IL-15- bzw. dem IL-15+21-Expansionsprotokoll. Die Sekretion von proinflammatorischen Zytokinen wie Interferon-gamma (IFN-g) und Tumor-Nekrose-Faktor-alpha (TNF-a) wurde zudem verstaerkt durch IL-21 angeregt, aber ebenso die Sekretion des immunsupprimierenden IL-10.
Weiter wurden die zytoinexpandierten NK-Zellen zur UEberpruefung ihrer in vivo Funktionalitaet anhand eines praeklinischen Xenograftmodells unter Verwendung von NOD SCID IL-2-Rgamma-/- (NSG) Maeusen und der Technologie der in-vivo-Biolumineszenzbildgebung getestet. Dabei konnte beobachtet werden, dass die NK-Zellen das Wachstum luciferaseexprimierender humaner Rhabdomyosarkome verlangsamten. Die Wirksamkeit der IL-15+21boost-expandierten NK-Zellen zeigte sich vor allem in einem kombinierten Ansatz, bei dem die Tumore zunaechst mit ionisierender Strahlung behandelt wurden und residuale Rhabdomyosarkomzellen anschliessend durch den adoptiven Transfer von humanen NK-Zellen in ihrem Wachstum gehemmt waren, solange die NK-Zelltherapie andauerte. Somit stellte sich die Kombination aus Bestrahlung und NK-Zelltransfer als wirksamer im Einsatz gegen Rhabdomyosarkome heraus als die alleinige Behandlung der Tumore durch Radiotherapie.
Zusammengefasst konnte in dieser Arbeit ein NK-Zellexpansionsprotokoll entwickelt werden, dass durch den ausschliesslichen Einsatz von Gammakettenzytokinen zu einem funktionalen NK-Zellprodukt fuehrte, welches auch in vivo lytische Aktivitaet gegenueber Rhabdomyosarkomzellen aufwies.
Die am Wochenende beschlossene Verfassungsänderung gibt Chinas Präsident Xi Jinping die Möglichkeit auf Lebenszeit im Amt zu bleiben. Das wird als Zeichen des wachsenden Autoritarismus und Xis zunehmender Macht gewertet. Doch ein genauerer Blick lässt zweifeln: Die Entscheidung ist eher Ausdruck von Zukunftssorgen und Selbstzweifeln der Regierenden in Peking.
Die vorliegende Arbeit befasst sich damit, wie die spezifische Durchführung eines besonderen psychologischen Laborexperiments in eine allgemeine, kausale Form übersetzt wird. Anstatt dazu formale Kriterien der Validität heranzuziehen, wird ein experimenteller Forschungsprozess ethnographisch begleitet.
Forschungsgegenstand ist ein Verhaltensexperiment aus der allgemeinen Psychologie zur Trainierbarkeit des Arbeitsgedächtnisses. Im Rahmen der Ethnographie werden teilnehmende Beobachtungen, Interviews und Dokumentensammlung kombiniert eingesetzt. Die Auswertung der Materialien erfolgt mithilfe der Situationsanalyse nach Clarke (2012), einer qualitativen Auswertungsmethode im Anschluss an die Grounded Theory.
In dieser Arbeit wird das Verhalten der Versuchsperson ins Zentrum gerückt, das die Messung in Gang setzt und hält und die Entstehung von zahlenförmigen Daten ermöglicht. Dazu wird in Orientierung an neueren Science & Technology Studies eine begriffliche Systematisierung der Experimentalpraxis aus dem empirischen Material herausgearbeitet, mit dem die Konstruktion und Transformation des Verhaltens der Versuchsperson im Verlauf des Datenerhebungs- Auswertungs- und Interpretationsprozesses beschrieben werden kann.
Die Ergebnisse der Ethnographie legen nahe, dass dieses Verhalten der Versuchsperson - korrespondierend zum kausal verfassten Endprodukt des Experiments - von der komplexen Erhebungssituation abhängig und paradoxerweise gleichzeitig unabhängig ist. Damit wird in Anlehnung an Latour (2002) zwischen konstruktivistischen und objektivistischen Positionen vermittelt. Zudem weisen die erforschten Praktiken die epistemische Stellung der Versuchsperson aus. Diese wird im Anschluss an die Terminologie von Rheinberger (2001/ 2006) als Mischform von epistemischem Ding (Neues) und technischem Ding (Bekanntes) bestimmt.
Due to immigration influxes, Germany’s ethnic diversity is on steady rise. Although citizens of immigrant origin make up a high percentage of the population in all Western European countries, they are descriptively underrepresented in most legislative bodies. As widely acknowledged, political parties form the key channels through which societal developments are fed into parliament. By selecting parliamentary candidates, they constitute the most crucial nexus of the population to be represented and legislative bodies. Despite the pivotal role of the intra-party candidate selection in shaping who runs for election, the question of how candidates of immigrant background fare in the candidate selection and whether the criteria political parties use for selecting candidates of immigrant background are the same as for native-born candidates remained a blind spot of the research on minority representation. Therefore, the dissertation scrutinizes the thresholds candidates of immigrant background need to overcome to run for legislative office. It thus tackles the questions of how political parties go about selecting candidates of immigrant background in comparison to native-born candidates and which contextual factors drive their choice of selection behavior. For this purpose, the dissertation develops three ideal-typical selection strategies political parties can adopt towards candidates of immigrant background, which are referred to as neutrality, opening or closure, and empirically tests which selection strategy is in use. To explore parties’ selection behavior towards candidates of immigrant background, the dissertation combines the advantages of quantitative analysis by employing candidate surveys at the state and national level, with advantages of qualitative analysis by conducting interviews with candidates of immigrant background. As the analysis reveals, neutrality is the predominant selection strategy that political parties use towards candidates of immigrant background, the reason being that neutral selection practices involve the fewest intra-party conflicts.
Determining the age of juvenile blow flies is one of the key tasks of forensic entomology when providing evidence for the minimum post mortem interval. While the age determination of blow fly larvae is well established using morphological parameters, the current study focuses on molecular methods for estimating the age of blow flies during the metamorphosis in the pupal stage, which lasts about half the total juvenile development. It has already been demonstrated in several studies that the intraspecific variance in expression of so far used genes in blow flies is often too high to assign a certain expression level to a distinct age, leading to an inaccurate prediction. To overcome this problem, we previously identified new markers, which show a very sharp age dependent expression course during pupal development of the forensically-important blow fly Calliphora vicina Robineau–Desvoidy 1830 (Diptera: Calliphoridae) by analyzing massive parallel sequencing (MPS) generated transcriptome data. We initially designed and validated two quantitative polymerase chain reaction (qPCR) assays for each of 15 defined pupal ages representing a daily progress during the total pupal development if grown at 17 °C. We also investigated whether the performance of these assays is affected by the ambient temperature, when rearing pupae of C. vicina at three different constant temperatures—namely 17 °C, 20 °C and 25 °C. A temperature dependency of the performance could not be observed, except for one marker. Hence, for each of the defined development landmarks, we can present gene expression profiles of one to two markers defining the mentioned progress in development.
We used electron cryo-tomography and subtomogram averaging to investigate the structure of complex I and its supramolecular assemblies in the inner mitochondrial membrane of mammals, fungi, and plants. Tomographic volumes containing complex I were averaged at ∼4 nm resolution. Principal component analysis indicated that ∼60% of complex I formed a supercomplex with dimeric complex III, while ∼40% were not associated with other respiratory chain complexes. The mutual arrangement of complex I and III2 was essentially conserved in all supercomplexes investigated. In addition, up to two copies of monomeric complex IV were associated with the complex I1III2 assembly in bovine heart and the yeast Yarrowia lipolytica, but their positions varied. No complex IV was detected in the respiratory supercomplex of the plant Asparagus officinalis. Instead, an ∼4.5-nm globular protein density was observed on the matrix side of the complex I membrane arm, which we assign to γ-carbonic anhydrase. Our results demonstrate that respiratory chain supercomplexes in situ have a conserved core of complex I and III2, but otherwise their stoichiometry and structure varies. The conserved features of supercomplex assemblies indicate an important role in respiratory electron transfer.
The major obstacle in the clinical use of the antitumor drug cisplatin is inherent and acquired resistance. Typically, cisplatin resistance is not restricted to a single mechanism demanding for a systems pharmacology approach to understand a whole cell’s reaction to the drug. In this study, the cellular transcriptome of untreated and cisplatin-treated A549 non-small cell lung cancer cells and their cisplatin-resistant sub-line A549rCDDP2000 was screened with a whole genome array for relevant gene candidates. By combining statistical methods with available gene annotations and without a previously defined hypothesis HRas, MAPK14 (p38), CCL2, DOK1 and PTK2B were identified as genes possibly relevant for cisplatin resistance. These and related genes were further validated on transcriptome (qRT-PCR) and proteome (Western blot) level to select candidates contributing to resistance. HRas, p38, CCL2, DOK1, PTK2B and JNK3 were integrated into a model of resistance-associated signalling alterations describing differential gene and protein expression between cisplatin-sensitive and -resistant cells in reaction to cisplatin exposure.
Natural Killer T cells (NKT cells) are emerging as critical regulators of pro- and anti-tumor immunity, both at baseline and in therapeutic settings. While type I NKT cells can promote anti-tumor immunity, their activity in the tumor microenvironment may be limited by negative regulators such as inhibitory immune checkpoints. We observed dominant expression of B- and T-lymphocyte attenuator (BTLA) on type I NKT cells in polyoma middle T oncogene-driven (PyMT) murine autochthonous mammary tumors. Other immune checkpoint receptors, such as programmed cell death 1 (PD-1) were equally distributed among T cell populations. Interference with BTLA using neutralizing antibodies limited tumor growth and pulmonary metastasis in the PyMT model in a therapeutic setting, correlating with an increase in type I NKT cells and expression of cytotoxic marker genes. While therapeutic application of an anti-PD-1 antibody increased the number of CD8+ cytotoxic T cells and elevated IL-12 expression, tumor control was not established. Expression of ZBTB16, the lineage-determining transcription factor of type I NKT cells, was correlated with a favorable patient prognosis in the METABRIC dataset, and BTLA levels were instrumental to further distinguish prognosis in patents with high ZBTB16 expression. Taken together, these data support a role of BTLA on type I NKT cells in limiting anti-tumor immunity.
kurz und kn@pp news : Nr. 42
(2018)
Even if the importance of micro data transparency is a well-established fact, European institutions are still lacking behind the US when it comes to the provision of financial market data to academics. In this Policy Letter we discuss five different types of micro data that are crucial for monitoring (systemic) risk in the financial system, identifying and understanding inter-linkages in financial markets and thus have important implications for policymakers and regulatory authorities. We come to the conclusion that for all five areas of micro data, outlined in this Policy Letter (bank balance sheet data, asset portfolio data, market transaction data, market high frequency data and central bank data), the benefits of increased transparency greatly offset potential downsides. Hence, European policymakers would do well to follow the US example and close the sizeable gap in micro data transparency. For most cases, relevant data is already collected (at least on national level), but just not made available to academics for partly incomprehensible reasons. Overcoming these obstacles could foster financial stability in Europe and assure level playing fields with US regulators and policymakers.
Does economic policy uncertainty affect household stockholding? To answer this question we create a novel measure of household exposure to economic policy uncertainty news by combining survey information on the hours a household spends in reading newspapers and the frequency of such news in the popular press during a household’s pre-interview period. After controlling for household fixed effects, month-year fixed effects and time-varying cognitive skills, we find that households with a higher exposure to economic policy uncertainty news are less likely to invest in stocks held directly or through mutual funds. This effect is independent from the market volatility index and household (first-moment) expectations about the stock market index.
Objectives: Within a randomized controlled trial contrasting the outcome of manualized cognitive-behavioral (CBT) and short term psychodynamic therapy (PDT) compared to a waiting list condition (the SOPHO-Net trial), we set out to test whether self-reported attachment characteristics change during the treatments and if these changes differ between treatments.
Research design and methods: 495 patients from the SOPHO-Net trial (54.5% female, mean age 35.2 years) who were randomized to either CBT, PDT or waiting list (WL) completed the partner-related revised Experiences in Close Relationships Questionnaire (ECR-R) before and after treatment and at 6 and 12 months follow-up. The Liebowitz Social Anxiety Scale (LSAS) was administered at pre-treatment, post-treatment, and at 6-month and 1-year follow-up. ECR-R scores were first compared to a representative healthy sample (n = 2508) in order to demonstrate that the clinical sample differed significantly from the non-clinical sample with respect to attachment anxiety and avoidance.
Results: LSAS scores correlated significantly with both ECR-R subscales. Post-therapy, patients treated with CBT revealed significant changes in attachment anxiety and avoidance whereas patients treated with PDT showed no significant changes. Changes between post-treatment and the two follow-ups were significant in both conditions, with minimal (insignificant) differences between treatments at the 12- month follow-up.
Conclusions: The current study supports recent reviews of mostly naturalistic studies indicating changes in attachment as a result of psychotherapy. Although there were differences between conditions at the end of treatment, these largely disappeared during the follow-up period which is line with the other results of the SOPHO-NET trial.
Trial registration: Controlled-trials.com ISRCTN53517394
The spirochete Borrelia burgdorferi is the causative agent of Lyme disease, the most common tick-borne disease in the US and Europe. No potent human vaccine is currently available. The innate immune complement system is vital to host defense against pathogens, as complement activation on the surface of spirochetes results in bacterial killing. Complement system is inhibited by the complement regulator factor H (FH). To escape killing, B. burgdorferi produces an outer surface protein CspZ that binds FH to inhibit complement activation on the cell surface. Immunization with CspZ alone does not protect mice from infection, which we speculate is because FH-binding cloaks potentially protective epitopes. We modified CspZ by conjugating to virus-like particles (VLP-CspZ) and eliminating FH binding (modified VLP-CspZ) to increase immunogenicity. We observed greater bactericidal antibody titers in mice vaccinated with modified VLP-CspZ: A serum dilution of 1:395 (modified VLP-CspZ) vs 1:143 (VLP-CspZ) yielded 50% borreliacidal activity. Immunizing mice with modified VLP-CspZ cleared spirochete infection, as did passive transfer of elicited antibodies. This work developed a novel Lyme disease vaccine candidate by conjugating CspZ to VLP and eliminating FH-binding ability. Such a strategy of conjugating an antigen to a VLP and eliminating binding to the target ligand can serve as a general model for developing vaccines against other bacterial infectious agents.
Acetaminophen [paracetamol, N-acetyl-p-aminophenol (APAP)]-induced acute liver injury (ALI) not only remains a persistent clinical challenge but likewise stands out as well-characterized paradigmatic model of drug-induced liver damage. APAP intoxication associates with robust hepatic necroinflammation the role of which remains elusive with pathogenic but also pro-regenerative/-resolving functions being ascribed to leukocyte activation. Here, we shine a light on and put forward a unique role of the interleukin (IL)-1 family member IL-18 in experimental APAP-induced ALI. Indeed, amelioration of disease as previously observed in IL-18-deficient mice was further substantiated herein by application of the IL-18 opponent IL-18-binding protein (IL-18BPd:Fc) to wild-type mice. Data altogether emphasize crucial pathological action of this cytokine in APAP toxicity. Adding recombinant IL-22 to IL-18BPd:Fc further enhanced protection from liver injury. In contrast to IL-18, the role of prototypic pro-inflammatory IL-1 and tumor necrosis factor-α is controversially discussed with lack of effects or even protective action being repeatedly reported. A prominent detrimental function for IL-18 in APAP-induced ALI as proposed herein should relate to its pivotal role for hepatic expression of interferon-γ and Fas ligand, both of which aggravate APAP toxicity. As IL-18 serum levels increase in patients after APAP overdosing, targeting IL-18 may evolve as novel therapeutic option in those hard-to-treat patients where standard therapy with N-acetylcysteine is unsuccessful. Being a paradigmatic experimental model of ALI, current knowledge on ill-fated properties of IL-18 in APAP intoxication likewise emphasizes the potential of this cytokine to serve as therapeutic target in other entities of inflammatory liver diseases.
A cGMP signaling cascade composed of C-type natriuretic peptide, the guanylyl cyclase receptor Npr2 and cGMP-dependent protein kinase I (cGKI) controls the bifurcation of sensory axons upon entering the spinal cord during embryonic development. However, the impact of axon bifurcation on sensory processing in adulthood remains poorly understood. To investigate the functional consequences of impaired axon bifurcation during adult stages we generated conditional mouse mutants of Npr2 and cGKI (Npr2fl/fl;Wnt1Cre and cGKIKO/fl;Wnt1Cre) that lack sensory axon bifurcation in the absence of additional phenotypes observed in the global knockout mice. Cholera toxin labeling in digits of the hind paw demonstrated an altered shape of sensory neuron termination fields in the spinal cord of conditional Npr2 mouse mutants. Behavioral testing of both sexes indicated that noxious heat sensation and nociception induced by chemical irritants are impaired in the mutants, whereas responses to cold sensation, mechanical stimulation, and motor coordination are not affected. Recordings from C-fiber nociceptors in the hind limb skin showed that Npr2 function was not required to maintain normal heat sensitivity of peripheral nociceptors. Thus, the altered behavioral responses to noxious heat found in Npr2fl/fl;Wnt1Cre mice is not due to an impaired C-fiber function. Overall, these data point to a critical role of axonal bifurcation for the processing of pain induced by heat or chemical stimuli.
Juvenile neuronal ceroid lipofuscinosis (JNCL) is caused by mutations in the CLN3 gene. Most JNCL patients exhibit a 1.02 kb genomic deletion removing exons 7 and 8 of this gene, which results in a truncated CLN3 protein carrying an aberrant C-terminus. A genetically accurate mouse model (Cln3Δex7/8 mice) for this deletion has been generated. Using cerebellar precursor cell lines generated from wildtype and Cln3Δex7/8 mice, we have here analyzed the consequences of the CLN3 deletion on levels of cellular gangliosides, particularly GM3, GM2, GM1a and GD1a. The levels of GM1a and GD1a were found to be significantly reduced by both biochemical and cytochemical methods. However, quantitative high-performance liquid chromatography analysis revealed a highly significant increase in GM3, suggesting a metabolic blockade in the conversion of GM3 to more complex gangliosides. Quantitative real-time PCR analysis revealed a significant reduction in the transcripts of the interconverting enzymes, especially of β-1,4-N-acetyl-galactosaminyl transferase 1 (GM2 synthase), which is the enzyme converting GM3 to GM2. Thus, our data suggest that the complex a-series gangliosides are reduced in Cln3Δex7/8 mouse cerebellar precursor cells due to impaired transcription of the genes responsible for their synthesis.
Hypoxia-induced long non-coding RNA Malat1 is dispensable for renal ischemia/reperfusion-injury
(2018)
Renal ischemia-reperfusion (I/R) injury is a major cause of acute kidney injury (AKI). Non-coding RNAs are crucially involved in its pathophysiology. We identified hypoxia-induced long non-coding RNA Malat1 (Metastasis Associated Lung Adenocarcinoma Transcript 1) to be upregulated in renal I/R injury. We here elucidated the functional role of Malat1 in vitro and its potential contribution to kidney injury in vivo. Malat1 was upregulated in kidney biopsies and plasma of patients with AKI, in murine hypoxic kidney tissue as well as in cultured and ex vivo sorted hypoxic endothelial cells and tubular epithelial cells. Malat1 was transcriptionally activated by hypoxia-inducible factor 1-α. In vitro, Malat1 inhibition reduced proliferation and the number of endothelial cells in the S-phase of the cell cycle. In vivo, Malat1 knockout and wildtype mice showed similar degrees of outer medullary tubular epithelial injury, proliferation, capillary rarefaction, inflammation and fibrosis, survival and kidney function. Small-RNA sequencing and whole genome expression analysis revealed only minor changes between ischemic Malat1 knockout and wildtype mice. Contrary to previous studies, which suggested a prominent role of Malat1 in the induction of disease, we did not confirm an in vivo role of Malat1 concerning renal I/R-injury.
Objectives: Investigate the effectiveness of a complex intervention aimed at improving the appropriateness of medication in older patients with multimorbidity in general practice.
Design: Pragmatic, cluster randomised controlled trial with general practice as unit of randomisation.
Setting: 72 general practices in Hesse, Germany.
Participants: 505 randomly sampled, cognitively intact patients (≥60 years, ≥3 chronic conditions under pharmacological treatment, ≥5 long-term drug prescriptions with systemic effects); 465 patients and 71 practices completed the study.
Interventions: Intervention group (IG): The healthcare assistant conducted a checklist-based interview with patients on medication-related problems and reconciled their medications. Assisted by a computerised decision support system, the general practitioner optimised medication, discussed it with patients and adjusted it accordingly. The control group (CG) continued with usual care.
Outcome measures: The primary outcome was a modified Medication Appropriateness Index (MAI, excluding item 10 on cost-effectiveness), assessed in blinded medication reviews and calculated as the difference between baseline and after 6 months; secondary outcomes after 6 and 9 months’ follow-up: quality of life, functioning, medication adherence, and so on.
Results: At baseline, a high proportion of patients had appropriate to mildly inappropriate prescriptions (MAI 0–5 points: n=350 patients). Randomisation revealed balanced groups (IG: 36 practices/252 patients; CG: 36/253). Intervention had no significant effect on primary outcome: mean MAI sum scores decreased by 0.3 points in IG and 0.8 points in CG, resulting in a non-significant adjusted mean difference of 0.7 (95% CI −0.2 to 1.6) points in favour of CG. Secondary outcomes showed non-significant changes (quality of life slightly improved in IG but continued to decline in CG) or remained stable (functioning, medication adherence).
Conclusions: The intervention had no significant effects. Many patients already received appropriate prescriptions and enjoyed good quality of life and functional status. We can therefore conclude that in our study, there was not enough scope for improvement.
Trial registration number: ISRCTN99526053. NCT01171339; Results.
We explore a combinatorial framework which efficiently quantifies the asymmetries between minima and maxima in local fluctuations of time series. We first showcase its performance by applying it to a battery of synthetic cases. We find rigorous results on some canonical dynamical models (stochastic processes with and without correlations, chaotic processes) complemented by extensive numerical simulations for a range of processes which indicate that the methodology correctly distinguishes different complex dynamics and outperforms state of the art metrics in several cases. Subsequently, we apply this methodology to real-world problems emerging across several disciplines including cases in neurobiology, finance and climate science. We conclude that differences between the statistics of local maxima and local minima in time series are highly informative of the complex underlying dynamics and a graph-theoretic extraction procedure allows to use these features for statistical learning purposes.
The long-chain fatty acid receptor FFAR1 is highly expressed in pancreatic β-cells. Synthetic FFAR1 agonists can be used as antidiabetic drugs to promote glucose-stimulated insulin secretion (GSIS). However, the physiological role of FFAR1 in β-cells remains poorly understood. Here we show that 20-HETE activates FFAR1 and promotes GSIS via FFAR1 with higher potency and efficacy than dietary fatty acids such as palmitic, linoleic, and α-linolenic acid. Murine and human β-cells produce 20-HETE, and the ω-hydroxylase-mediated formation and release of 20-HETE is strongly stimulated by glucose. Pharmacological inhibition of 20-HETE formation and blockade of FFAR1 in islets inhibits GSIS. In islets from type-2 diabetic humans and mice, glucose-stimulated 20-HETE formation and 20-HETE-dependent stimulation of GSIS are strongly reduced. We show that 20-HETE is an FFAR1 agonist, which functions as an autocrine positive feed-forward regulator of GSIS, and that a reduced glucose-induced 20-HETE formation contributes to inefficient GSIS in type-2 diabetes.
Der Beitrag bietet eine Übersicht zu den Zusammenhängen zwischen Immaterialgüterrechten (IP [intellectual property]-Rechte), Privatautonomie und Innovation. Demnach beruht das IP-Recht auf der Annahme, dass erst die Kombination aus fungiblen Ausschließlichkeitsrechten und Privatautonomie – also die juristische Form der Marktwirtschaft – einen innovationsförderlichen Effekt verspricht. Dementsprechend kombiniert das geltende Recht ein hohes materielles IP-Schutzniveau mit einer weitreichenden Anerkennung der Privatautonomie der Berechtigten. Dieser Regulierungsansatz hat den Vorteil, dass sehr anpassungsfähige Rahmenbedingungen für Innovationen geschaffen werden. Wer für seine Innovation eine umfassende Exklusivität benötigt, kann unter Geltung der beiden genannten Prinzipien ebenso operieren wie Akteure, die auf IP-Schutz teilweise oder ganz verzichten möchten, weil ihnen dies unter den gegebenen Wettbewerbsbedingungen vorzugswürdig erscheint. Und doch erläutert der Beitrag, dass die naheliegende Folgerung zu kurz greift, der Gesetzgeber könne sich darauf beschränken, möglichst umfassende und zugleich fungible IP-Rechte zu kodifizieren, da der Markt stets für eine effiziente und auch sonst sozial wünschenswerte Ressourcenallokation sorge. Denn die mit ausschließlichen IP-Rechten verbundenen Transaktionskosten stehen diesem Ziel nicht selten im Wege. Damit zeigt sich, dass keine noch so elaborierte Vertragsrechtstheorie die Frage nach dem Sinn des logisch vorrangigen Eigentums erübrigt.
Das Immaterialgüterrecht bildet eine der ältesten und inzwischen umfangreichsten Materien des Einheitsprivatrechts. Fast alle Staaten der Erde sind Mitglieder der World Intellectual Property Organization und bekennen sich als solche zur Förderung des „geistigen Eigentums“. Allerdings ist der Rechtsschutz nach dem seinerseits universell anerkannten Territorialitätsprinzip auf das Territorium des jeweiligen Gesetzgebers beschränkt. Zu dieser geografischen Fragmentierung treten fremdenrechtliche Beschränkungen des Zugangs zum lokalen Rechtsschutz hinzu. Der Beitrag erläutert, welche Akteure die Spannung zwischen globaler Kommunikation und fragmentiertem Immaterialgüterrechtsschutz auf welche Weisen regulativ bearbeiten. Dabei wird unterschieden zwischen der Rechtsangleichung bei fortdauernder Fragmentierung, der Schaffung supranational einheitlicher Verfahren, Immaterialgüterrechte und Gerichte sowie informellen Kooperationen zwischen Privaten und Patentämtern. Die Leitfrage der Bestandsaufnahme lautet, ob all diese Phänomene im Sinne von Kropholler und David als funktionales Einheitsrecht begriffen werden können, ob es sich also um Rechtssätze handelt, bei denen die Einheitlichkeit ihrer Geltung im Interesse des unverfälschten internationalen Handels zu einem besonderen Rechtszweck erhoben wurde, oder ob man lediglich objektiv-formal eine rechtlich bindende Einheitlichkeit konstatieren kann, die primär ein anderes Ziel verfolgt, nämlich: die weltweite Stärkung des Immaterialgüterrechtsschutzes. Den Abschluss bildet eine kritische Stellungnahme zur verbreiteten Annahme, die weit fortgeschrittene Vereinheitlichung des Immaterialgüterrechts sei ein großartiger Erfolg.
Target-specific treatment modalities are currently not available for triple-negative breast cancer (TNBC), and acquired chemotherapy resistance is a primary obstacle for the treatment of these tumors. Here we employed derivatives of BT-549 and MDA-MB-468 TNBC cell lines that were adapted to grow in the presence of either 5-Fluorouracil, Doxorubicin or Docetaxel in an aim to identify molecular pathways involved in the adaptation to drug-induced cell killing. All six drug-adapted BT-549 and MDA-MB-468 cell lines displayed cross resistance to chemotherapy and decreased apoptosis sensitivity. Expression of the anti-apoptotic co-chaperone BAG3 was notably enhanced in two thirds (4/6) of the six resistant lines simultaneously with higher expression of HSP70 in comparison to parental controls. Doxorubicin-resistant BT-549 (BT-549rDOX20) and 5-Fluorouracil-resistant MDA-MB-468 (MDA-MB-468r5-FU2000) cells were chosen for further analysis with the autophagy inhibitor Bafilomycin A1 and lentiviral depletion of ATG5, indicating that enhanced cytoprotective autophagy partially contributes to increased drug resistance and cell survival. Stable lentiviral BAG3 depletion was associated with a robust down-regulation of Mcl-1, Bcl-2 and Bcl-xL, restoration of drug-induced apoptosis and reduced cell adhesion in these cells, and these death-sensitizing effects could be mimicked with the BAG3/Hsp70 interaction inhibitor YM-1 and by KRIBB11, a selective transcriptional inhibitor of HSF-1. Furthermore, BAG3 depletion was able to revert the EMT-like transcriptional changes observed in BT-549rDOX20 and MDA-MB-468r5-FU2000 cells. In summary, genetic and pharmacological interference with BAG3 is capable to resensitize TNBC cells to treatment, underscoring its relevance for cell death resistance and as a target to overcome therapy resistance of breast cancer.
Germany Inc. was an idiosyncratic form of industrial organization that put financial institutions at the center. This paper argues that the consumption of private benefits in related party transactions by these key agents can be understood as a compensation for their coordinating and monitoring function in Germany Inc. As a consequence, legal tools apt to curb tunneling remained weak in Germany from the perspective of outside shareholders. While banks were in a position to use their firm-level knowledge and influence to limit rent-seeking by other related parties, their own behavior was not subject to meaningful controls. With the dismantling of Germany Inc. banks seized their monitoring function and left an unprecedented void with regard to related party transactions. Hence, a “traditionalist” stance which opposes law reform for related party transactions in Germany negatively affects capital market development, growth opportunities and ultimately social welfare.
We characterize the optimal linear tax on capital in an Overlapping Generations model with two period lived households facing uninsurable idiosyncratic labor income risk. The Ramsey government internalizes the general equilibrium feedback of private precautionary saving. For logarithmic utility our full analytical solution of the Ramsey problem shows that the optimal aggregate saving rate is independent of income risk. The optimal time-invariant tax on capital is increasing in income risk. Its sign depends on the extent of risk and on the Pareto weight of future generations. If the Ramsey tax rate that maximizes steady state utility is positive, then implementing this tax rate permanently generates a Pareto-improving transition even if the initial equilibrium is dynamically efficient. We generalize our results to Epstein-Zin-Weil utility and show that the optimal steady state saving rate is increasing in income risk if and only if the intertemporal elasticity of substitution is smaller than 1.
This paper investigates the roles psychological biases play in empirically estimated deviations between subjective survival beliefs (SSBs) and objective survival probabilities (OSPs). We model deviations between SSBs and OSPs through age-dependent inverse S-shaped probability weighting functions (PWFs), as documented in experimental prospect theory. Our estimates suggest that the implied measures for cognitive weakness, likelihood insensitivity, and those for motivational biases, relative pessimism, increase with age. We document that direct measures of cognitive weakness and motivational attitudes share these trends. Our regression analyses confirm that these factors play strong quantitative roles in the formation of subjective survival beliefs. In particular, cognitive weakness is an increasingly important contributor to the overestimation of survival chances in old age.