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Purpose: In secondary progressive Multiple Sclerosis (SPMS), global neurodegeneration as a driver of disability gains importance in comparison to focal inflammatory processes. However, clinical MRI does not visualize changes of tissue composition outside MS lesions. This quantitative MRI (qMRI) study investigated cortical and deep gray matter (GM) proton density (PD) values and T1 relaxation times to explore their potential to assess neuronal damage and its relationship to clinical disability in SPMS.
Materials and Methods: 11 SPMS patients underwent quantitative T1 and PD mapping. Parameter values across the cerebral cortex and deep GM structures were compared with 11 healthy controls, and correlation with disability was investigated for regions exhibiting significant group differences.
Results: PD was increased in the whole GM, cerebral cortex, thalamus, putamen and pallidum. PD correlated with disability in the whole GM, cerebral cortex, putamen and pallidum. T1 relaxation time was prolonged and correlated with disability in the whole GM and cerebral cortex.
Conclusion: Our study suggests that the qMRI parameters GM PD (which likely indicates replacement of neural tissue with water) and cortical T1 (which reflects cortical damage including and beyond increased water content) are promising qMRI candidates for the assessment of disease status, and are related to disability in SPMS.
The Hepatitis C virus (HCV) infects more than 170 million individuals worldwide and causes challenging HCV-related diseases. Unfortunately, there is no vaccine available. Therefore, a better understanding of the HCV life cycle is urgently needed to develop more effective and better tolerated therapies.
It has been reported that the secretory pathway plays an essential role for the release of HCV, and the SNARE complexes are a central factor controlling intracellular vesicular trafficking. Recently, our group observed that α-taxilin that binds to free syntaxin 4 prevents the SNARE complex formation and exerts an inhibitory effect on the release of HCV particles. Therefore, it was analyzed whether the t-SNARE protein syntaxin 4 is involved in the HCV life cycle.
An increased intracellular amount of syntaxin 4 was found in HCV-positive cells, while the level of syntaxin 4-specific transcripts was decreased as observed in HCV-positive Huh7.5 cells and in HCV-infected primary human hepatocytes (PHH). Since in HCV-positive cells a significant longer half-life of syntaxin 4 was found, the decreased expression is overcompensated, leading to the elevated amount of syntaxin 4. Overexpression of syntaxin 4 increases the amount of secreted infectious viral particles, while silencing of syntaxin 4 expression decreases the number of released viral particles, which indicates that HCV could use the SNARE-dependent secretory pathway for viral release. Confocal immunofluorescence microscopy and co-immunoprecipitation experiments revealed that syntaxin 4 interacts with HCV core and NS5A. To identify the binding domain, various mutants of syntaxin 4 were generated. Based on these mutants, it was found that the H3 domain of syntaxin 4 interacts with core. These data show that the t-SNARE protein syntaxin 4 is an essential cellular factor for HCV morphogenesis and secretion.
HCV induces autophagy, and in HCV-infected cells a major fraction of the de novo synthesized viral particles is not released but intracellularly degraded. Syntaxin 17 is an autophagosomal SNARE required for the fusion of autophagosomes with lysosomes to form autolysosomes and thereby to deliver the enclosed contents for degradation. Therefore, we aim to investigate whether syntaxin 17 is a relevant factor for the HCV life cycle by regulating the fusion between autophagosomes and lysosomes. It was found that HCV-positive cells possess a decreased amount of syntaxin 17, and HCV reduces the intracellular level of syntaxin 17 by NS5A-mediated interruption of c-Raf signaling, which triggers the syntaxin 17 transcription, and by HCV-dependently induced autophagy. Overexpression of syntaxin 17 decreases the intracellular amount of viral particles and reduces the number of released infectious viral particles by favoring the formation of autolysosomes, in which HCV particles can be degraded. Vice versa, inhibition of syntaxin 17 expression by specific siRNAs results in an elevated amount of intracellular viral particles and increases the number of released viral particles by impaired autophagosome-lysosome fusion. Confocal immunofluorescence microscopy analyses show a fraction of core protein in autophagosomes as stained by lysotracker and the autophagy maker p62. These data identify syntaxin 17 as a novel factor controlling the release of HCV and reveal the autophagosome-autolysosome fusion as an essential step affecting the equilibrium between the release of infectious viral particles and lysosomal degradation of intracellular viral particles.
Taken together, these data identify the t-SNARE proteins syntaxin 4 and syntaxin 17 as essential cellular factors for HCV morphogenesis and secretion.
Background: It is occasionally difficult to distinguish the stellate reticulum-like region of ameloblastoma from the fibrous connective tissue stroma. This difficulty is further pronounced in the plexiform variant of ameloblastoma that has very sparse fibrous connective tissue.
Aim: To test the utility of Azan trichrome stain in marking tumour regions and the peri-tumour environment of ameloblastoma.
Materials and Methods: Sections were prepared for 18 formalin fixed paraffin-embedded blocks of ameloblastoma cases and stained with Azan trichrome stain according to the manufacturer's specification.
Results and Conclusions: The tumour areas were stained mostly brown, with the ameloblasts mainly marked as deep brown while the stellate reticulum-like region was light brown. The structures in the peri-tumour region were marked with different shades of blue. Azan trichrome staining was able to distinguish between the fibrous connective tissue and the stellate reticulum-like areas in 100% of the cases.
Isolated generalized dystonia is a central motor network disorder characterized by twisted movements or postures. The most frequent genetic cause is a GAG deletion in the Tor1a (DYT1) gene encoding torsinA with a reduced penetrance of 30-40 % suggesting additional genetic or environmental modifiers. Development of dystonia-like movements after a standardized peripheral nerve crush lesion in wild type (wt) and Tor1a+/- mice, that express 50 % torsinA only, was assessed by scoring of hindlimb movements during tail suspension, by rotarod testing and by computer-assisted gait analysis. Western blot analysis was performed for dopamine transporter (DAT), D1 and D2 receptors from striatal and quantitative RT-PCR analysis for DAT from midbrain dissections. Autoradiography was used to assess the functional DAT binding in striatum. Striatal dopamine and its metabolites were analyzed by high performance liquid chromatography. After nerve crush injury, we found abnormal posturing in the lesioned hindlimb of both mutant and wt mice indicating the profound influence of the nerve lesion (15x vs. 12x relative to control) resembling human peripheral pseudodystonia. In mutant mice the phenotypic abnormalities were increased by about 40 % (p < 0.05). This was accompanied by complex alterations of striatal dopamine homeostasis. Pharmacological blockade of dopamine synthesis reduced severity of dystonia-like movements, whereas treatment with L-Dopa aggravated these but only in mutant mice suggesting a DYT1 related central component relevant to the development of abnormal involuntary movements. Our findings suggest that upon peripheral nerve injury reduced torsinA concentration and environmental stressors may act in concert in causing the central motor network dysfunction of DYT1 dystonia.
Evading innate immunity is a prerequisite for pathogenic microorganisms in order to survive in their respective hosts. Concerning Lyme disease spirochetes belonging to the Borrelia (B.) burgdorferi sensu lato group, a broad range of diverse vertebrates serve as reservoir or even as incidental hosts, including humans. The capability to infect multiple hosts implies that spirochetes have developed sophisticated means to counter the destructive effects of complement of humans and various animals. While the means by which spirochetes overcome the hosts immune defense are far from being completely understood, there is a growing body of evidence suggesting that binding of the key regulator of the alternative pathway, Factor H, plays a pivotal role for immune evasion and that Factor H is an important determinant of host specificity. This review covers (i) the contribution of complement in host-specificity and transmissibility of Lyme disease spirochetes; (ii) the involvement of borrelial-derived determinants to host specificity; (iii) the interplay of human and animal Factor H with complement-acquiring surface proteins of diverse borrelial species; and (iv) the potential role of additional animal complement proteins in the immune evasion of spirochetes.
Background: Common ECG criteria such as ST-segment changes are of limited value in patients with suspected acute myocardial infarction (AMI) and bundle branch block or wide QRS complex. A large proportion of these patients do not suffer from an AMI, whereas those with ST-elevation myocardial infarction (STEMI) equivalent AMI benefit from an aggressive treatment. Aim of the present study was to evaluate the diagnostic information of cardiac troponin I (cTnI) in hemodynamically stable patients with wide QRS complex and suspected AMI.
Methods: In 417 out of 1818 patients presenting consecutively between 01/2007 and 12/2008 in a prospective multicenter observational study with suspected AMI a prolonged QRS duration was observed. Of these, n = 117 showed significant obstructive coronary artery disease (CAD) used as diagnostic outcome variable. cTnI was determined at admission.
Results: Patients with significant CAD had higher cTnI levels compared to individuals without (median 250ng/L vs. 11ng/L; p<0.01). To identify patients needing a coronary intervention, cTnI yielded an area under the receiver operator characteristics curve of 0.849. Optimized cut-offs with respect to a sensitivity driven rule-out and specificity driven rule-in strategy were established (40ng/L/96ng/L). Application of the specificity optimized cut-off value led to a positive predictive value of 71% compared to 59% if using the 99th percentile cut-off. The sensitivity optimized cut-off value was associated with a negative predictive value of 93% compared to 89% provided by application of the 99th percentile threshold.
Conclusion: cTnI determined in hemodynamically stable patients with suspected AMI and wide QRS complex using optimized diagnostic thresholds improves rule-in and rule-out with respect to presence of a significant obstructive CAD.
Infant acute leukemia still has a poor prognosis, and allogeneic hematopoietic stem cell transplantation is indicated in selected patients. Umbilical cord blood (UCB) is an attractive cell source for this population because of the low risk of chronic graft-versus-host disease (GVHD), the strong graft-versus-leukemia effect, and prompt donor availability. This retrospective, registry-based study reported UCB transplantation (UCBT) outcomes in 252 children with acute lymphoblastic leukemia (ALL; n = 157) or acute myelogenous leukemia (AML; n = 95) diagnosed before 1 year of age who received a single-unit UCBT after myeloablative conditioning between 1996 and 2012 in European Society for Blood and Marrow Transplantation centers. Median age at UCBT was 1.1 years, and median follow-up was 42 months. Most patients (57%) received a graft with 1 HLA disparity and were transplanted in first complete remission (CR; 55%). Cumulative incidence function (CIF) of day 100 acute GVHD (grades II to IV) was 40% ± 3% and of 4-year chronic GVHD was 13% ± 2%. CIF of 1-year transplant-related mortality was 23% ± 3% and of 4-year relapse was 27% ± 3%. Leukemia-free-survival (LFS) at 4 years was 50% ± 3%; it was 40% and 66% for those transplanted for ALL and AML, respectively (P = .001). LFS was better for patients transplanted in first CR, regardless of diagnosis. In multivariate model, diagnosis of ALL (P = .001), advanced disease status at UCBT (<.001), age at diagnosis younger than 3 months (P = .012), and date of transplant before 2004 were independently associated with worse LFS. UCBT is a suitable option for patients diagnosed with infant acute leukemia who achieve CR. In this cohort, patients with AML had better survival than those with ALL.
Ubiquitination plays a critical role in the activation of host immune responses to infection and serves as a signal for pathogen delivery to phagophores along the xenophagy pathway. We recently performed systematic ubiquitination site profiling of epithelial cells infected with Salmonella Typhimurium. Our findings specifically highlight components of the NFKB, membrane trafficking pathways and RHO GTPase systems as ubiquitination hubs during infection. In addition, a broad spectrum of bacterial effectors and several outer membrane proteins are ubiquitinated in infected cells. This comprehensive resource of ubiquitinome dynamics during Salmonella infection enables further understanding of the complex host-pathogen interplay and may reveal novel targets for the inhibition of Salmonella invasion and inflammation.
Abstract:
Snakebite is an important medical emergency in rural Nepal. Correct identification of the biting species is crucial for clinicians to choose appropriate treatment and anticipate complications. This is particularly important for neurotoxic envenoming which, depending on the snake species involved, may not respond to available antivenoms. Adequate species identification tools are lacking. This study used a combination of morphological and molecular approaches (PCR-aided DNA sequencing from swabs of bite sites) to determine the contribution of venomous and non-venomous species to the snakebite burden in southern Nepal. Out of 749 patients admitted with a history of snakebite to one of three study centres, the biting species could be identified in 194 (25.9%). Out of these, 87 had been bitten by a venomous snake, most commonly the Indian spectacled cobra (Naja naja; n = 42) and the common krait (Bungarus caeruleus; n = 22). When both morphological identification and PCR/sequencing results were available, a 100% agreement was noted. The probability of a positive PCR result was significantly lower among patients who had used inadequate “first aid” measures (e.g. tourniquets or local application of remedies). This study is the first to report the use of forensic genetics methods for snake species identification in a prospective clinical study. If high diagnostic accuracy is confirmed in larger cohorts, this method will be a very useful reference diagnostic tool for epidemiological investigations and clinical studies.
Author Summary:
Snakebite is an important medical problem in sub-tropical and tropical regions, including Nepal where tens of thousands of people are bitten every year. Snakebite can result in life-threatening envenoming, and correct identification of the biting species is crucial for care providers to choose appropriate treatment and anticipate complications. This paper explores a number of methods, including molecular techniques, to assist care providers in identifying the species responsible for bites in rural Nepal. Out of 749 patients with a history of snakebite, the biting species could be identified in 194 (25.9%). Out of these, 87 had been bitten by a venomous snake, most commonly cobras (n = 42) and kraits (n = 22). This study is the first to report the use of molecular techniques for snake species identification. The diagnostic accuracy of this method appears high but needs to be confirmed in larger studies.
The mitotic spindle assembly checkpoint (SAC) maintains genome stability and marks an important target for antineoplastic therapies. However, it has remained unclear how cells execute cell fate decisions under conditions of SAC‐induced mitotic arrest. Here, we identify USP9X as the mitotic deubiquitinase of the X‐linked inhibitor of apoptosis protein (XIAP) and demonstrate that deubiquitylation and stabilization of XIAP by USP9X lead to increased resistance toward mitotic spindle poisons. We find that primary human aggressive B‐cell lymphoma samples exhibit high USP9X expression that correlate with XIAP overexpression. We show that high USP9X/XIAP expression is associated with shorter event‐free survival in patients treated with spindle poison‐containing chemotherapy. Accordingly, aggressive B‐cell lymphoma lines with USP9X and associated XIAP overexpression exhibit increased chemoresistance, reversed by specific inhibition of either USP9X or XIAP. Moreover, knockdown of USP9X or XIAP significantly delays lymphoma development and increases sensitivity to spindle poisons in a murine Eμ‐Myc lymphoma model. Together, we specify the USP9X–XIAP axis as a regulator of the mitotic cell fate decision and propose that USP9X and XIAP are potential prognostic biomarkers and therapeutic targets in aggressive B‐cell lymphoma.
Alle lebenden Organismen sind in der Lage, sich an den re-gelmäßigen Wechsel von Licht und Dunkelheit und den zeitli-che Veränderungen im Takt der Jahreszeiten anzupassen. Die-se Synchronisierung der Aktivitäts- und Ruhephasen, sowie von physiologischen Stoffwechselprozessen an die vorgegebe-nen tageszeitlichen und saisonalen Zyklen findet beim Säu-getier in der inneren Uhr im Nucleus Suprachiasmaticus (SCN) statt. Das Licht, als wichtigster Zeitgeber für die Synchronisation der inneren Uhr, findet Eingang zum SCN über die Retina und den retinohypothalamischen Trakt (RTH), der Glutamat als Neurotransmitter nutzt. Ist dieses System fehlerhaft, führt dies zu Störung der oben beschriebenen Anpassungsprozesse. Dies hat eine gestörte Homöostase des Organismus zu Folge, aus denen sich wiederum Veränderungen im Tag/Nacht- Rhythmus, Schlafstörungen und depressive Ver-stimmungen ergeben können. Die genannten Symptome decken sich mit den Frühsymptomen den neurodegenerativen Erkran-kung Morbus Parkinson.
Ziel der vorliegenden Arbeit war es, Störungen im photoneu-roendokrinen System, insbesondere Veränderungen in der Re-tina an den photosensitiven Ganglienzellen mit dem Photo-pigment Melanopsin und dem SCN bei transgene Mäuse mit dem humanen alpha-Synuclein zu untersuchen. Hierbei wurden transgene Mäuse mit dem gesunden humanen alpha-Synuclein (Wildtyp) und transgene Mäuse mit der für Parkinson spezi-fischen Mutation im alpha-Synuclein Ala53Thr (A53T) vergli-chen.
Die immunochemischen Untersuchungen an Retina und SCN zei-gen einen signifikanten Anstieg der alpha-Synuclein Immun-reaktion bei der A53T Maus im Vergleich zum Wildtyp.
Parallel dazu wurden Unterschiede in Bezug auf das Photo-pigment Melanopsin zwischen den beiden Gruppen untersucht. Melanopsin ist lichtsensitiv und trägt, durch Übermittlung der aktuellen Lichtverhältnisse über den retinohypothalami-schen Trakt zum SCN, zur Synchronisation der circadianen Rhythmik bei. Durch den in dieser Arbeit nachgewiesene Me-lanopsindefizit und des deutlich reduzierten Vglut2 im hy-pothalamischen Trakt der A53T Maus lässt sich die Hypothese ableiten, dass möglicherweise die Überexpression des mu-tierten alpha-Synuclein in der Retina einen Untergang von melanopsinhaltigen Ganglienzellen herbeiführt und dadurch die Synchronisation der inneren Uhr durch Licht gestört ist. Diese Hypothese wird durch die Aktivitätsprofile ge-stützt, die durch die Aufzeichnung der lokomotorischen Ak-tivität der Tiere erstellt wurden.
Da in beiden Gruppen unter Dauerdunkel (DD) ein endogener zirkadianer Rhythmus beobachtet werden konnte, lässt dies auf die Funktionstüchtigkeit der inneren Uhr im SCN schlie-ßen. Im anschließenden Versuch die endogene Rhythmik an exogenen Reize anzupassen, zeigte sich bei dem A53T Stamm eine fehlende Synchronisierung an vorgegebene Lichtverhält-nisse mit gesteigerter Tagaktivität und reduzierten Schlaf-phasen. Somit trägt der fehlerhaft verarbeitete Lichtreiz bei A53T Mutanten zur Destabilisierung des zirkadianen Rhythmus der Lokomotion bei. Trotz des gestörten glutama-tergen Signalweges im retinohypothalamischen Trakt konnten keine Unterschiede in der Expression der Homerproteine zwi-schen Wildtyp und A53T unter Standard-Photoperiode und nach Schlafdeprivation nachgewiesen werden.
Die vorliegenden Befunde liefern Erkenntnisse zur Entste-hung der Frühsymptome bei Morbus Parkinson. Dies könnte neue Ansatzpunkte für die Therapie und Linderung von Schlafstörungen sowie Veränderungen im Tag/Nachtrhythmus liefern.
Ziel:
Vergleich der Veränderung der mütterlichen Einstellung zur Geburt anhand von Hebammen geführten Geburtsvorbereitungskursen oder hypnoreflexogenem Training zur Geburtsvorbereitung.
Methode:
Zu Beginn und nach Beendigung der Kurse wurde die mütterliche Einstellung zur Geburt unter Zuhilfenahme des Osgood-Ertel-Eindrucksdifferenzials gemessen. Der Gießen-Test zur Persönlichkeitsbeurteilung wurde einmalig angewendet.
Ergebnisse:
213 Frauen waren in die Studie eingeschlossen. 155 davon nahmen an, von Hebammen geführten, Geburtsvorbereitungskursen teil. 58 Frauen absolvierten ein hypnoreflexogenes Training. Es waren zu Beginn der Kurse keine statistisch signifikanten Unterschiede feststellbar in Bezug auf die Charakteristiken der Teilnehmerinnen sowie im Gießen-Test und in den Ergebnissen des Osgood-Ertel-Eindrucksdifferenzials. Nach der von Hebammen geführten Geburtsvorbereitung wurde die Geburt negativer wahrgenommen(Freudlosigkeit und Trübung in der Valenz-Dimension [p < 0,05]), während die Geburt nach dem Hypnosetraining emotional positiver bewertet wurde (Freude
und Harmonie in der Valenz-Dimension [p < 0,01] sowie Helligkeit [p < 0,05]).
Zusammenfassung:
Hypnoreflexogenes Selbsthypnosetraining zur Geburtsvorbereitung scheint stärkere und positivere mütterliche emotionale Veränderungen in Bezug auf die
Einstellung zur Geburt auszulösen als konventionelle, von Hebammen geführte Geburtsvorbereitungskurse. Weitere retrospektive randomisierte Studien sind nötig, um diese Ergebnisse zu überprüfen.
Background: Cell salvage is commonly used as part of a blood conservation strategy. However concerns among clinicians exist about the efficacy of transfusion of washed cell salvage.
Methods: We performed a meta-analysis of randomized controlled trials in which patients, scheduled for all types of surgery, were randomized to washed cell salvage or to a control group with no cell salvage. Data were independently extracted, risk ratio (RR), and weighted mean differences (WMD) with 95% confidence intervals (CIs) were calculated. Data were pooled using a random effects model. The primary endpoint was the number of patients exposed to allogeneic red blood cell (RBC) transfusion.
Results: Out of 1140 search results, a total of 47 trials were included. Overall, the use of washed cell salvage reduced the rate of exposure to allogeneic RBC transfusion by a relative 39% (RR = 0.61; 95% CI 0.57 to 0.65; P < 0.001), resulting in an average saving of 0.20 units of allogeneic RBC per patient (weighted mean differences [WMD] = -0.20; 95% CI -0.22 to -0.18; P < 0.001), reduced risk of infection by 28% (RR = 0.72; 95% CI 0.54 to 0.97; P = 0.03), reduced length of hospital stay by 2.31 days (WMD = -2.31; 95% CI -2.50 to -2.11; P < 0.001), but did not significantly affect risk of mortality (RR = 0.92; 95% CI 0.63 to 1.34; P = 0.66). No statistical difference could be observed in the number of patients exposed to re-operation, plasma, platelets, or rate of myocardial infarction and stroke.
Conclusions: Washed cell salvage is efficacious in reducing the need for allogeneic RBC transfusion and risk of infection in surgery.
Sie hören Stimmen, vermuten Botschaften in bedeutungslosen Ereignissen oder fühlen sich ferngesteuert: Die Symptome von Menschen mit einer schizophrenen Störung galten bisher als »uneinfühlbar«, da für Außenstehende nicht nachvollziehbar. Aktuelle neurowissenschaftliche Modelle helfen, die Verwechslung von »eigen« und »fremd« aufzuklären.