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Institute
- Theodor-Boveri-Institut für Biowissenschaften (94)
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Sonstige beteiligte Institutionen
A search for the Standard Model Higgs boson in the H→WW(⋆)→ℓνℓνH→WW(⋆)→ℓνℓν (ℓ=e,μℓ=e,μ) decay mode is presented. The search is performed using proton–proton collision data corresponding to an integrated luminosity of 4.7 fb\(^{−1}\) at a centre-of-mass energy of 7 TeV collected during 2011 with the ATLAS detector at the Large Hadron Collider. No significant excess of events over the expected background is observed. An upper bound is placed on the Higgs boson production cross section as a function of its mass. A Standard Model Higgs boson with mass in the range between 133 GeV and 261 GeV is excluded at 95% confidence level, while the expected exclusion range is from 127 GeV to 233 GeV.
Detailed measurements of the electron performance of the ATLAS detector at the LHC are reported, using decays of the Z, W and J/ψ particles. Data collected in 2010 at s√=7 TeV are used, corresponding to an integrated luminosity of almost 40 pb\(^{−1}\). The inter-alignment of the inner detector and the electromagnetic calorimeter, the determination of the electron energy scale and resolution, and the performance in terms of response uniformity and linearity are discussed. The electron identification, reconstruction and trigger efficiencies, as well as the charge misidentification probability, are also presented.
Proton–proton collisions at √s=7 TeV and heavy ion collisions at \(\sqrt{sNN}\)=2.76 TeV were produced by the LHC and recorded using the ATLAS experiment’s trigger system in 2010. The LHC is designed with a maximum bunch crossing rate of 40 MHz and the ATLAS trigger system is designed to record approximately 200 of these per second. The trigger system selects events by rapidly identifying signatures of muon, electron, photon, tau lepton, jet, and B meson candidates, as well as using global event signatures, such as missing transverse energy. An overview of the ATLAS trigger system, the evolution of the system during 2010 and the performance of the trigger system components and selections based on the 2010 collision data are shown. A brief outline of plans for the trigger system in 2011 is presented.
Using inelastic proton-proton interactions at s√=900 GeV and 7 TeV, recorded by the ATLAS detector at the LHC, measurements have been made of the correlations between forward and backward charged-particle multiplicities and, for the first time, between forward and backward charged-particle summed transverse momentum. In addition, jet-like structure in the events is studied by means of azimuthal distributions of charged particles relative to the charged particle with highest transverse momentum in a selected kinematic region of the event. The results are compared with predictions from tunes of the pythia and herwig++ Monte Carlo generators, which in most cases are found to provide a reasonable description of the data.
Diazepinomicin is a dibenzodiazepine alkaloid with an unusual structure among the known microbial metabolites discovered so far. Diazepinomicin was isolated from the marine sponge-associated strain Micromonospora sp. RV115 and was identified by spectroscopic analysis and by comparison to literature data. In addition to its interesting preclinical broad-spectrum antitumor potential, we report here new antioxidant and anti-protease activities for this compound. Using the ferric reducing antioxidant power (FRAP) assay, a strong antioxidant potential of diazepinomicin was demonstrated. Moreover, diazepinomicin showed a significant antioxidant and protective capacity from genomic damage induced by the reactive oxygen species hydrogen peroxide in human kidney (HK-2) and human promyelocytic (HL-60) cell lines. Additionally, diazepinomicin inhibited the proteases rhodesain and cathepsin L at an IC50 of 70–90 μM. It also showed antiparasitic activity against trypomastigote forms of Trypanosoma brucei with an IC50 of 13.5 μM. These results showed unprecedented antioxidant and anti-protease activities of diazepinomicin, thus further highlighting its potential as a future drug candidate.
Nach Einschätzung der Weltgesundheitsorganisation WHO wird Krebs im Jahr 2013 die weltweit häufigste Todesursache bei Menschen und Haustieren sein. Diese Situation erfordert die Entwicklung neuer therapeutischer Ansätze. Hauptziel einer Tumortherapie ist es, sowohl den Primärtumor als auch die Metastasen möglichst vollständig zu entfernen. Dabei wird nach Methoden gesucht, die im Gegensatz zu den meisten gegenwärtigen therapeutischen Einsätzen, wie der chirurgischen Entfernung bösartiger Neubildungen, Chemotherapie und Strahlentherapie, selektiv die bösartigen Zellen erkennen und zerstören können. Eine faszinierende Möglichkeit in dieser Hinsicht ist die Verwendung von onkolytischen Viren, die die Fähigkeit besitzen, sich selektiv sowohl in Primärtumoren als auch in Metastasen anzusiedeln und die Krebszellen dort zu zerstören. Das Konzept, dass Viren nützlich für die Bekämpfung von Krebs sein könnten, ist nicht neu. Allerdings konnte erst in den letzten Jahren durch zahlreiche Studien bestätigt werden, dass verschiedene Viren in der Lage sind, eine signifikante Antitumorwirkung in vivo auszuüben. Zu den erfolgversprechenden onkolytischen Viren zählen insbesondere Adenovirus, Herpes simplex Virus, Reovirus und Vaccinia-Virus, die sich bereits in Phase III der klinischen Studien befinden oder kurz davor sind. Die therapeutische Nutzung von tumorspezifischen onkolytischen Viren beim Menschen hat bereits begonnen. Im Rahmen der vorliegenden Doktorarbeit wurden verschiedene Aspekte der Wirkungsweise von Vaccinia-Virus-Stämmen bei der Therapie verschiedener Tumore aus Mensch und Hund im Xenotransplantat-Mausmodell bearbeitet: die Onkolyse der Krebszellen und Inhibition des Tumorwachstums sowie die Effekte der Virusinfektion auf das Tumormikromilieu und die Mitwirkung des angeborenen Immunsystems bei der Virotherapie. Das Tumormikromilieu (Stroma) setzt sich aus einer Vielzahl verschiedener Zellen und Komponenten der extrazellulären Matrix zusammen. Die Krebszellen bilden unter anderem mit Endothelzellen des Blut- und Lymphsystems und verschiedenen Immunzellen eine komplexe Organ-ähnliche Struktur. Weitere wichtige Bestandteile des Stromas sind Wachstumsfaktoren, Chemokine und Zytokine und die Tumorvaskulatur. Diese ist durch zahlreiche strukturelle und funktionelle Abnormalitäten charakterisiert, wodurch die Effektivität von Strahlen- und Chemotherapie herabgesetzt wird. Weiterhin ist das Tumormikromilieu durch seine Ähnlichkeit mit einer chronischen Entzündungsreaktion gekennzeichnet und wirkt immunsupprimierend auf rekrutierte Leukozyten, die wiederum die Inflammation verstärken und die Angiogenese und das Tumorwachstum weiter fördern. Aufgrund dieser vielen Komponenten ist die Zusammensetzung jedes Tumors einzigartig, weswegen Standardtherapien häufig nicht zu einer Heilung führen. Die Wirkung der Viren bei der Virotherapie beruht vermutlich auf 4 Mechanismen, die einzeln oder in Kombination auftreten können: die direkte Onkolyse der Krebszellen, die Zerstörung des Tumorblutgefäßsystems, die Aktivierung des Immunsystems des Wirts und die Suppression der microRNA-Expression des Wirtes. Zusätzlich kann die Expression therapeutischer Gene die onkolytische Wirkung verstärken. Zum Nachweis der Onkolyse der Krebszellen und Inhibition des Tumorwachstums wurde zuerst das Virus GLV-1h68 in einem autologen humanen Melanomzellpaar, 888-MEL und 1936-MEL, eingesetzt. Das GLV-1h68-Virus wurde auf Basis des Wildtyp Vaccinia-Virus LIVP durch die Insertion von 3 Expressionskassetten in den drei Genloci F14.5L, J2R und A56 genetisch konstruiert. 888-MEL, eine zu einem frühen Zeitpunkt der Krebserkrankung aus einer Metastase isolierte Zelllinie, zeigt nach Infektion mit GLV-1h68 im Mausmodell Tumornekrose („Responder“), während 1936-MEL aus einer späten Metastasierungsphase kaum mit Onkolyse auf eine Virusinfektion reagiert („Poor-Responder“). Die onkolytische Wirkung konnte mittels Durchflusszytometrie in Tumoren beider Zelllinien zu einem frühen Zeitpunkt nach Virusinfektion nachgewiesen werden. In 888-MEL-Tumoren wurde hierbei eine große Zahl infizierter und toter Zellen nach Virusinfektion gefunden. Gleichzeitig wurde eine hohe Zahl an Immunzellen detektiert, die nach Virusinfektion reduziert war. In den schwächer reagierenden 1936-MEL-Tumoren konnte eine Onkolyse bei Infektion mit höherer Virusmenge und zu einem früheren Zeitpunkt demonstriert werden, wodurch mehr Zellen infiziert wurden. Zusätzlich wurde eine Steigerung der nur in geringer Zahl vorhandenen Immunzellen nachgewiesen. Trotz des unterschiedlichen Tumormikromilieus konnte somit ein onkolytischer Effekt in beiden Tumormodellen erzielt werden. ...
The high failure rate of new drug candidates in preclinical or clinical studies due to hepatotoxicity represents a considerable problem in the drug development. Hence, there is an urgent need to develop new approaches for early and reliable prediction of drug-induced hepatotoxicity that enables a better identification of drug candidates with high potential for toxicity at early stages of drug development. Therefore, the aim of this work was to improve the prediction of drug-induced liver injury in preclinical studies through evaluation of more reliable and sensitive biomarkers of hepatotoxicity and a better understanding of the underlying mechanistic basis for drug-induced toxicity. First, the ability of a set of potential markers (NGAL, thiostatin, clusterin, PON1) to detect early signs of liver injury was assessed in rats treated with drug candidates that were dropped from further development, in part due to toxic adverse effects in the liver. In summary, PON1 and clusterin were not consistently altered in response to liver injury and thus provide no additive information to the traditional liver enzymes in detecting drug-induced hepatotoxicity. In contrast, thiostatin and NGAL were increased in serum and urine of treated animals in a time- and dose-dependent manner. These changes correlated well with mRNA expression in the target organ and generally reflected the onset and degree of drug-induced liver injury. Receiver-operating characteristics analyses supported serum thiostatin, but not NGAL, as a better indicator of drug-induced hepatobiliary injury than conventional clinical chemistry parameters, such as ALP, ALT and AST. Although thiostatin, an acute phase protein expressed in a range of tissues, may not be specific for liver injury, our results indicate that thiostatin may serve as a sensitive, minimally-invasive diagnostic marker of inflammation and tissue damage in preclinical safety assessment. In the second part of this work, combined application of genomics profiling technology and RNAi to inhibit the pharmacological target of a drug candidate BAY16, a glucagon receptor (GCGR) antagonist, was used to determine if interference with the pharmacological target plays a role in the toxic response to BAY16, and to narrow down those molecular changes that are associated with toxicity, and not the pharmacological action of BAY16. In contrast to Bay 16, which was found to be cytotoxic at concentrations of 75 µM, silencing of the glucagon receptor did not affect cell viability in primary rat hepatocytes. Thus, it can be concluded that hepatotoxicity of Bay 16 was not related to the drugs inhibitory effect on the glucagon receptor in vitro and in vivo. These findings were supported by the fact that most of BAY16-induced changes in gene expression occurred independently of the pharmacological modulation of GCGR. These off-target effects include altered xenobiotic metabolism, oxidative stress, increased fatty acid synthesis, and alterations in cholesterol and bile acid metabolic processes. Although it was not possible to draw a final conclusion about the mechanism of BAY16 hepatotoxicity, changes in these molecular mechanisms appear contribute to progression of hepatic injury. With regard to drug safety assessment in preclinical studies, the utilization of siRNA technology in vitro represents a new approach to improve mechanistic understanding of the nature of drug’s toxicity, being either chemically mediated or due to primary or secondary pharmacological mode of action.
Optimal open-loop control, i.e. the application of an analytically derived control rule, is demonstrated for nanooptical excitations using polarization-shaped laser pulses. Optimal spatial near-field localization in gold nanoprisms and excitation switching is realized by applying a shift to the relative phase of the two polarization components. The achieved near-field switching confirms theoretical predictions, proves the applicability of predefined control rules in nanooptical light–matter interaction and reveals local mode interference to be an important control mechanism.
Background: During early stages of brain development, secreted molecules, components of intracellular signaling pathways and transcriptional regulators act in positive and negative feed-back or feed-forward loops at the mid-hindbrain boundary. These genetic interactions are of central importance for the specification and subsequent development of the adjacent mid-and hindbrain. Much less, however, is known about the regulatory relationship and functional interaction of molecules that are expressed in the tectal anlage after tectal fate specification has taken place and tectal development has commenced.
Results: Here, we provide experimental evidence for reciprocal regulation and subsequent cooperation of the paired-type transcription factors Pax3, Pax7 and the TALE-homeodomain protein Meis2 in the tectal anlage. Using in ovo electroporation of the mesencephalic vesicle of chick embryos we show that (i) Pax3 and Pax7 mutually regulate each other's expression in the mesencephalic vesicle, (ii) Meis2 acts downstream of Pax3/7 and requires balanced expression levels of both proteins, and (iii) Meis2 physically interacts with Pax3 and Pax7. These results extend our previous observation that Meis2 cooperates with Otx2 in tectal development to include Pax3 and Pax7 as Meis2 interacting proteins in the tectal anlage.
Conclusion: The results described here suggest a model in which interdependent regulatory loops involving Pax3 and Pax7 in the dorsal mesencephalic vesicle modulate Meis2 expression. Physical interaction with Meis2 may then confer tectal specificity to a wide range of otherwise broadly expressed transcriptional regulators, including Otx2, Pax3 and Pax7.
Imprinted genes play important roles in brain development. As the neural developmental capabilities of human parthenogenetic embryonic stem cells (hpESCs) with only a maternal genome were not assessed in great detail, hence here the potential of hpESCs to differentiate into various neural subtypes was determined. In addition DNA methylation and expression of imprinted genes upon neural differentiation was also investigated. The results demonstrated that hpESC-derived neural stem cells (hpNSCs) showed expression of NSC markers Sox1, Nestin, Pax6, and Musashi1 (MS1), the silencing of pluripotency genes (Oct4, Nanog) and the absence of activation of neural crest (Snai2, FoxD3) and mesodermal (Acta1) markers. Moreover, confocal images of hpNSC cultures exhibited ubiquitous expression of NSC markers Nestin, Sox1, Sox2 and Vimentin. Differentiating hpNSCs for 28 days generated neural subtypes with neural cell type-specific morphology and expression of neuronal and glial markers, including Tuj1, NeuN, Map2, GFAP, O4, Tau, Synapsin1 and GABA. hpNSCs also responded to region-specific differentiation signals and differentiated into regional phenotypes such as midbrain dopaminergic- and motoneuron-type cells. hpESC-derived neurons showed typical neuronal Na+/K+ currents in voltage clamp mode, elicited multiple action potentials with a maximum frequency of 30 Hz. Cell depicted a typical neuron-like current pattern that responded to selective pharmacological blockers of sodium (tetrodotoxin) and potassium (tetraethylammonium) channels. Furthermore, in hpESCs and hpNSCs the majority of CpGs of the differentially methylated regions (DMRs) KvDMR1 were methylated whereas DMR1 (H19/Igf2 locus) showed partial or complete absence of CpG methylation, which is consistent with a parthenogenetic (PG) origin. Upon differentiation parent-of-origin-specific gene expression was maintained in hpESCs and hpNSCs as demonstrated by imprinted gene expression analyses. Together this shows that despite the lack of a paternal genome, hpNSCs are proficient in differentiating into glial- and neuron-type cells, which exhibit electrical activity similar to newly formed neurons. Moreover, maternal-specific gene expression and imprinting-specific DNA-methylation are largely maintained upon neural differentiation. hpESCs are a means to generate histocompatible and disease allele-free ESCs. Additionally, hpESCs are a unique model to study the influence of imprinting on neurogenesis.
Parent of origin imprints on the genome have been implicated in the regulation of neural cell type differentiation. The ability of human parthenogenetic (PG) embryonic stem cells (hpESCs) to undergo neural lineage and cell type-specific differentiation is undefined. We determined the potential of hpESCs to differentiate into various neural subtypes. Concurrently, we examined DNA methylation and expression status of imprinted genes. Under culture conditions promoting neural differentiation, hpESC-derived neural stem cells (hpNSCs) gave rise to glia and neuron-like cells that expressed subtype-specific markers and generated action potentials. Analysis of imprinting in hpESCs and in hpNSCs revealed that maternal-specific gene expression patterns and imprinting marks were generally maintained in PG cells upon differentiation. Our results demonstrate that despite the lack of a paternal genome, hpESCs generate proliferating NSCs that are capable of differentiation into physiologically functional neuron-like cells and maintain allele-specific expression of imprinted genes. Thus, hpESCs can serve as a model to study the role of maternal and paternal genomes in neural development and to better understand imprinting-associated brain diseases.
This thesis is devoted to numerical verification of optimality conditions for non-convex optimal control problems. In the first part, we are concerned with a-posteriori verification of sufficient optimality conditions. It is a common knowledge that verification of such conditions for general non-convex PDE-constrained optimization problems is very challenging. We propose a method to verify second-order sufficient conditions for a general class of optimal control problem. If the proposed verification method confirms the fulfillment of the sufficient condition then a-posteriori error estimates can be computed. A special ingredient of our method is an error analysis for the Hessian of the underlying optimization problem. We derive conditions under which positive definiteness of the Hessian of the discrete problem implies positive definiteness of the Hessian of the continuous problem. The results are complemented with numerical experiments. In the second part, we investigate adaptive methods for optimal control problems with finitely many control parameters. We analyze a-posteriori error estimates based on verification of second-order sufficient optimality conditions using the method developed in the first part. Reliability and efficiency of the error estimator are shown. We illustrate through numerical experiments, the use of the estimator in guiding adaptive mesh refinement.
5.1 Immuntherapie mit vom Tumorstroma abgeleiteten Peptiden Tumore bestehen nicht nur aus Tumorzellen, sondern auch aus der sie umgebenden extrazellulären Matrix (EZM), und Stromazellen wie Fibroblasten (cancer-associated fibroblast; CAF) und Endothelzellen (tumor endothelial cell; TEC). Diese Stromazellen haben durch die Ausschüttung von Zytokinen, proteolytischen Enzymen, Wachstums- und Angiogenesefaktoren einen entscheidenden Einfluss auf die Tumorprogression. Sie unterscheiden sich von den Stromazellen der normalen Gewebe durch die Expression von sogenannten Tumorstroma-assoziierten Antigenen (TSAA). Damit sollten Therapien, die auf TSAA abzielen, universell einsetzbar und weniger anfällig gegenüber Resistenzentwicklungen (immune escape Mechanismen) sein, da Stromazellen im Gegensatz zu neoplastischen Zellen genetisch relativ stabil sind. Für eine Immuntherapie mit vom Tumorstroma abgeleiteten Peptiden wählten wir die TSAA Endoglin und Fap, welche während der Wundheilung und im Tumorstroma induziert werden. Dabei sollte überprüft werden, ob prophylaktische Vakzinierungen in C57Bl/6j Mäusen Peptid-reaktive T-Zellen induzieren können, und das Wachstum von transplantieren Grm1-transgenen Tumoren reduziert werden kann. In der Tat konnten wir sowohl bei Endoglin- als auch bei Fap Peptid vakzinierten Tieren in vivo Peptid-reaktive Lymphozyten im Blut und zu einem geringeren Anteil auch in der Milz nachweisen, welche Peptid-gepulste syngene Milzzellen lysieren konnten. Allerdings konnte in beiden Fällen keine Reduktion des Tumorwachstums gegenüber der Kontrollgruppe beobachtet werden. Bei der Fap-Peptid-vakzinierten Gruppe war das Tumorwachstum gegenüber der Kontrollgruppe sogar gesteigert. Dies könnte darauf hindeuten, dass die Induktion Fap-Peptid-reaktiver T-Zellen tumorpromovierend wirkt. Möglicherweise könnte aber durch eine Modifikation des Vakzinierungsprotokolls bzw. durch eine Kombination mit anderen Immuntherapeutika ein verbessertes Ansprechen auf eine Endoglin bzw. Fap basierte Immuntherapie erzielt werden. 5.2 Immunsuppressive Mechanismen im Grm1-transgenen Melanom-Modell Grm1-transgene Mäuse entwickeln spontan kutane Melanome. Dieses Modell erlaubte es uns in der vorliegenden Arbeit spontane Immunantworten im Laufe der Melanomentstehung zu untersuchen. Hierfür analysierten wir sowohl ex vivo als auch in vitro aus Milz und Lymphknoten gewonnene Lymphozyten von Mäusen, welche keine Tumorläsionen bzw. eine niedrige oder hohe Tumorlast aufwiesen. Dabei konnten wir ex vivo einen Anstieg der Frequenz aktivierter CD4+ und CD8+ Lymphozyten mit zunehmender Tumorlast zeigen. Bei tumortragenden Tieren exprimierten jedoch hauptsächlich CD4+ T-Zellen Aktivierungsmarker nach in vitro Stimulation. Interessanterweise waren diese Zellen tumortragender Tiere auch funktionell beeinträchtigt, was sich in einer verminderten Proliferationskapazität nach in vitro Stimulation zeigte. Weitere Analysen ergaben, dass die erhöhte Frequenz regulatorischer T Zellen bei tumortragenden Tieren ein frühes Ereignis im Laufe der Tumorentstehung ist. Gleichzeitig konnte auch ein starker Anstieg der immunsupprimierenden Zytokine Tgf-β1 und Il-10 sowohl in den Lymphknoten als auch im Tumorgewebe beobachtet werden. Dabei war die Tgf-β1-Expression sowohl im Tumor als auch im tumor-drainierenden Lymphknoten erhöht, während Il-10 im Tumor nur moderat exprimiert wurde, was eine komplexere Regulation der Il-10-Expression nahe legt. Dies bedeutet, dass in Grm1-transgenen Mäusen ähnlich wie auch bei Melanompatienten zelluläre und zytokinabhängige Mechanismen zur Tumorentstehung beitragen und dieses Modell daher geeignet ist, um präklinisch immunmodulierende Therapieansätze zu testen.
Cellular and cytokine-dependent immunosuppressive mechanisms of grm1-transgenic murine melanoma
(2012)
Grm1-transgenic mice spontaneously develop cutaneous melanoma. This model allowed us to scrutinize the generic immune responses over the course of melanoma development. To this end, lymphocytes obtained from spleens, unrelated lymph nodes and tumor-draining lymph nodes of mice with no evidence of disease, and low or high tumor burden were analyzed ex vivo and in vitro. Thereby, we could demonstrate an increase in the number of activated CD4\(^+\) and CD8+ lymphocytes in the respective organs with increasing tumor burden. However, mainly CD4\(^+\) T cells, which could constitute both T helper as well as immunosuppressive regulatory T cells, but not CD8\(^+\) T cells, expressed activation markers upon in vitro stimulation when obtained from tumor-bearing mice. Interestingly, these cells from tumor-burdened animals were also functionally hampered in their proliferative response even when subjected to strong in vitro stimulation. Further analyses revealed that the increased frequency of regulatory T cells in tumor-bearing mice is an early event present in all lymphoid organs. Additionally, expression of the immunosuppressive cytokines TGF-β1 and IL-10 became more evident with increased tumor burden. Notably, TGF-β1 is strongly expressed in both the tumor and the tumor-draining lymph node, whereas IL-10 expression is more pronounced in the lymph node, suggesting a more complex regulation of IL-10. Thus, similar to the situation in melanoma patients, both cytokines as well as cellular immune escape mechanisms seem to contribute to the observed immunosuppressed state of tumor-bearing grm1-transgenic mice, suggesting that this model is suitable for preclinical testing of immunomodulatory therapeutics.
Hintergrund: Über die psychische Gesundheit von Asylsuchenden in Deutschland ist wenig bekannt. Ziel dieser Studie ist, (1) die psychische Gesundheit der Asylsuchenden in der Würzburger Gemeinschaftsunterkunft zu beschreiben, (2) ihre Wahrnehmung der aktuellen Lebensbedingungen zu erfassen, sowie (3) mögliche Zusammenhänge zwischen beiden Bereichen zu untersuchen. Methoden: Alle Bewohner der Würzburger Gemeinschaftsunterkunft, welche zum Zeitpunkt der Befragung mindestens 16 Jahre alt waren und den Studienfragebogen in einer der Sprachen Arabisch, Amharisch, Farsi, Russich, Somali, Deutsch oder Englisch ausfüllen konnten, konnten an dieser Querschnittbefragung teilnehmen. Das Vorhandensein von psychischen Erkrankungen (Somatoformes Syndrom, Depressive Syndrome, Angstsyndrome, Alkoholsyndrom und eine Screeningfrage für PTBS), sowie das Ausmaß an psychosozialem Stress wurden mittels des PRIME-MD Patient Health Questionnaire (PHQ) gemessen. Die subjektive Einschätzung der Lebensbedingungen durch die Teilnehmer wurde mit einem für die spezifischen Bedingungen entwickelten Fragebogen erfasst. Die Ergebnisse wurden deskriptiv dargestellt und Korrelationen zwischen der Bewertung der Lebensbedingungen und ausgewählten Parametern der psychischen Gesundheit wurden mittels Chi-Quadrat-Tests und des Spearman Rangkorrelationskoeffizienten berechnet. Ergebnisse: Insgesamt nahmen 183 Bewohner an der Befragung teil. Der PHQ konnte für 140 Teilnehmer ausgewertet werden, der Fragebogen zu aktuellen Lebensbedingungen für 113 Teilnehmer. Die häufigsten PHQ-Syndrome waren das Somatoforme Syndrom (38,6%; n=54), Depressive Syndrome (25,7% (n=36) Major Depressives Syndrom; 22,8% (n=32) andere depressive Syndrome) und Angstsyndrome (11,4% (n=16) Paniksyndrom, 9,3% (n=13) andere Angstsyndrome). Bei 38,6% (n=54) ergab der PHQ für mehr als ein Syndrom ein positives Ergebnis. Die Lebensbedingungen in der Gemeinschaftsunterkunft wurden größtenteils negativ bewertet und ihre Auswirkungen auf die eigene Gesundheit wurden im Mittel als „ziemlich stark“ beurteilt. Eine schlechtere Bewertung der Lebensbedingungen und eine längere Aufenthaltsdauer in der Gemeinschaftsunterkunft waren in univariaten Analysen mit einem schlechteren Ergebnis bezüglich verschiedener Parameter der psychischen Gesundheit assoziiert (z.B. depressive Syndrome, psychosoziale Belastung). Schlussfolgerung: Verschiedene Limitationen der Studie müssen berücksichtigt werden (z.B. Querschnittdesign, mangelnde Validierung der Fragebogenübersetzungen). Dennoch zeigen diese Ergebnisse eine deutliche Unzufriedenheit der Studienteilnehmer mit den Lebensbedingungen in der Gemeinschaftsunterkunft auf und lassen eine hohe Prävalenz psychischer Erkrankungen in der Studienpopulation vermuten.
Tropische Infektionskrankheiten wie Malaria, Leishmaniose oder auch die Afrikanische Trypanosomiase sind aufgrund von zunehmenden Resistenzen der Erreger, globaler Erwärmung, aber auch von Versäumnissen in der Vergangenheit bei der kontinuierlichen Weiterentwicklung bestehender sowie der Erforschung neuer Medikamente auch im 21. Jahrhundert noch eine große Bedrohung für Millionen von Menschen. Die Suche nach neuartigen Wirkstoffen und deren Weiterentwicklung zu potenziellen Medikamenten ist daher zwingend erforderlich. Insbesondere Produkte des Sekundärstoffwechsels wie etwa die Alkaloide bilden wichtige Grundlagen als Leitstrukturen für pharmazeutische Wirkstoffe. Eine solche Klasse phytochemischen Ursprungs sind die Naphthylisochinolin-Alkaloide mit interessanten strukturellen Eigenschaften sowie pharmakologischen Wirksamkeiten. Einige Vertreter zeigen ausgeprägte In-vitro-Aktivitäten gegen protozoische Erreger wie Plasmodien, Leishmanien und Trypanosomen. Besonders die neuartige Unterklasse ionischer N,C-verknüpfter Naphthylisochinolin-Alkaloide, wie z.B. Ancistrocladinium A und Ancistrocladinium B, zeichnen sich durch gute antileishmaniale Wirkungen aus. In Vorarbeiten zeigten erste Studien zu Struktur-Aktivitäts-Beziehungen (SAR-Studien) mit vereinfachten N,C-gekuppelten Arylisochinolinen, dass sich durch gezielte Strukturvariation die Aktivität gegen einen Erreger verbessern lässt. Zusätzlich wurde mit ersten Untersuchungen zum Wirkmechanismus dieser interessanten Verbindungen begonnen. Darüber hinaus ermöglicht die kontinuierliche Verbesserung der analytischen Methoden inzwischen die schnelle und gezielte Suche nach neuen Verbindungen aus der Natur. Durch die Anwendung von Online-Analyse-Verfahren, wie z.B. die Kopplung von HPLC mit NMR und MS, gelingt die Aufklärung der Konstitution von Substanzen direkt aus Extrakten. Ziel der vorliegenden Arbeit war die Verbesserung der biologischen Aktivitäten der N,C-verknüpften Arylisochinoline durch strukturelle Derivatisierung sowie Beiträge zur Aufklärung des Wirkmechanismus mittels markierter Verbindungen. Zusätzlich sollten Naturstoffe unter Verwendung moderner HPLC-Kopplungstechniken untersucht und strukturell aufgeklärt werden.
Die vorliegende Arbeit beschäftigt sich mit der Licht-Materie-Wechselwirkung in Quantenpunkt-Mikroresonatoren und deren vertikalen und lateralen Emissionseigenschaften. Quantenpunkte sind nanoskopische Strukturen, in denen die Beweglichkeit der Ladungsträger unterhalb der de-Broglie-Wellenlänge eingeschränkt ist, wodurch die elektronische Zustandsdichte diskrete Werte annimmt. Sie werden daher auch als künstliche Atome bezeichnet. Um die Emissionseigenschaften der Quantenpunkte zu modifizieren, werden sie im Rahmen dieser Arbeit als aktive Schicht in Mikrosäulenresonatoren eingebracht. Diese bestehen aus einer GaAs lambda-Kavität, die zwischen zwei Braggspiegeln aus alternierenden GaAs und AlAs Schichten eingefasst ist. Diese Resonatoren bieten sowohl eine vertikale Emission über Fabry-Perot Moden, als auch eine laterale Emission über Flustergaleriemoden. Die Licht-Materie-Wechselwirkung zwischen den Resonatormoden und lokalisierten Ladungsträgern in den Quantenpunkten, genannt Exzitonen, kann in zwei Regime unterteilt werden. Im Regime der starken Kopplung wird der spontane Emissionsprozess in einem Quantenpunkt reversibel und das emittierte Photon kann wieder durch den Quantenpunkt absorbiert werden. Die theoretische Beschreibung der Kopplung eines Exzitons an die Resonatormode erfolgt über das Jaynes-Cummings Modell und kann im Tavis-Cummings Modell auf mehrere Emitter erweitert werden. Ist die Dämpfung des Systems zu gross, so befindet man sich im Regime der schwachen Kopplung, in dem die Emissionsrate des Quantenpunkts durch den Purcell-Effekt erhöht werden kann. In diesem Regime können Mikrolaser mit hohen Einkopplungsraten der spontanen Emission in die Resonatormode und niedrigen Schwellpumpströmen realisiert werden. Zur Charakterisierung der Proben werden vor allem die Methoden der Mikro-Elektrolumineszenz und der Photonenkorrelationsmessungen eingesetzt.
The two bradykinin receptors B1R and B2R are central components of the kallikrein–kinin system with different expression kinetics and binding characteristics. Activation of these receptors by kinins triggers inflammatory responses in the target organ and in most situations enhances tissue damage. We could recently show that blocking of B1R, but not B2R, protects from cortical cryolesion by reducing inflammation and edema formation. In the present study, we investigated the role of B1R and B2R in a closed head model of focal traumatic brain injury (TBI; weight drop). Increased expression of B1R in the injured hemispheres of wild-type mice was restricted to the later stages after brain trauma, i.e. day 7 (P<0.05), whereas no significant induction could be observed for the B2R (P>0.05). Mice lacking the B1R, but not the B2R, showed less functional deficits on day 3 (P<0.001) and day 7 (P<0.001) compared with controls. Pharmacological blocking of B1R in wild-type mice had similar effects. Reduced axonal injury and astroglia activation could be identified as underlying mechanisms, while inhibition of B1R had only little influence on the local inflammatory response in this model. Inhibition of B1R may become a novel strategy to counteract trauma-induced neurodegeneration.
Traumatic brain injury (TBI) is a result of an outside force causing immediate mechanical disruption of brain tissue and delayed pathogenic events. In order to examine injury processes associated with TBI, a number of rodent models to induce brain trauma have been described. However, none of these models covers the entire spectrum of events that might occur in TBI. Here we provide a thorough methodological description of a straightforward closed head weight drop mouse model to assess brain injuries close to the clinical conditions of human TBI.
Melanoma arises from the malignant transformation of melanocytes and is one of the most aggressive forms of human cancer. In fish of the genus Xiphophorus, melanoma development, although very rarely, happens spontaneously in nature and can be induced by interspecific crossing. The oncogenic receptor tyrosine kinase, Xmrk, is responsible for melanoma formation in these fishes. Since Xiphophorus are live-bearing fishes and therefore not compatible with embryonic manipulation and transgenesis, the Xmrk melanoma model was brought to the medaka (Oryzias latipes) system. Xmrk expression under the control of the pigment cell specific mitf promoter leads to melanoma formation with 100% penetrance in medaka. Xmrk is an orthologue of the human epidermal growth factor receptor (EGFR) and activates several downstream signaling pathways. Examples of these pathways are the direct phosphorylation of BRAF and Stat5, as well as the enhanced transcription of C-myc. BRAF is a serine-threonine kinase which is found mutated at high frequencies in malignant melanomas. Stat5 is a transcription factor known to be constitutively activated in fish melanoma. C-myc is a transcription factor that is thought to regulate the expression of approximately 15% of all human genes and is involved in cancer progression of a large number of different tumors. To gain new in vivo information on candidate factors known to be involved in melanoma progression, I identified and analysed BRAF, Stat5 and C-myc in the laboratory fish model system medaka. BRAF protein motifs are highly conserved among vertebrates and the results of this work indicate that its function in the MAPK signaling is maintained in medaka. Transgenic medaka lines carrying a constitutive active version of BRAF (V614E) showed more pigmented skin when compared to wild type. Also, some transiently expressing BRAF V614E fishes showed a disrupted eye phenotype. In addition, I was able to identify two Stat5 copies in medaka, named Stat5ab/a and Stat5ab/b. Sequence analysis revealed a higher similarity between both Stat5 sequences when compared to either human Stat5a or Stat5b. This suggests that the two Stat5 copies in medaka arose by an independent duplication processes. I cloned these two Stat5 present in medaka, produced constitutive active and dominant negative gene versions and successfully established transgenic lines carrying each version under the control of the MITF promoter. These lines will help to elucidate questions that are still remaining in Stat5 biology and its function in melanoma progression, like the role of Stat5 phosphorylation on tumor invasiveness. In a third project during my PhD work, I analysed medaka C-myc function and indentified two copies of this gene in medaka, named c-myc17 and c-myc20, according to the chromosome where they are located. I produced conditional transgenic medaka lines carrying the c-myc17 gene coupled to the hormone binding domain of the estrogen receptor to enable specific transgene activation at a given time point. Comparable to human C-myc, medaka C-myc17 is able to induce proliferation and apoptosis in vivo after induction. Besides that, C-myc17 long-term activation led to liver hyperplasia. In summary, the medaka models generated in this work will be important to bring new in vivo information on genes involved in cancer development. Also, the generated transgenic lines can be easily crossed to the melanoma developing Xmrk medaka lines, thereby opening up the possibility to investigate their function in melanoma progression. Besides that, the generated medaka fishes make it possible to follow the whole development of melanocytes, since the embryos are transparent and can be used for high throughput chemical screens.
Intrazerebrale stereotaktische Eingriffe werden zu einem großen Teil ohne direkte Sichtkontrolle durchgeführt. Ein Operateur muss sich deshalb bei der räumlichen Festlegung von Strukturen und beim Anfahren dieser Strukturen auf Hilfsmittel wie stereotaktische Geräte und auf Atlanten, über welche die stereotaktischen Geräte gesteuert werden, verlassen. Trotz großer Fortschritte bei den bildgebenden Verfahren während der letzten dreißig Jahre, ist es gegenwärtig noch nicht möglich, zuverlässig alle subkortikalen Strukturen mit computertomographischen (CT) oder magnetresonanztomographischen (MRT) zu identifizieren oder begrenzen. Eine ganze Reihe zytoarchitektonischer beziehungsweise immunhistochemischer Atlanten wurde veröffentlicht. Dennoch ist es nicht gelungen, die Ergebnisse und Abbildungen dieser Atlanten mit bildgebenden Verfahren bis in die gewünschten Details zu kombinieren, um auf diese Weise das immer noch geringe Auflösungsvermögen radiologischer Methoden zu erhöhen. Deformationen bei der Gewebsentnahme des Gehirns, bei der anschließenden Einbettung, bei der alkoholischen Dehydrierung des Gewebes, Verformungen beim Schneiden und Färben der Schnitte überfordern selbst hoch komplexe mathematische Verfahren und Algorithmen beim Versuch, zytoarchitektonische und immunhistochemische Schnitte mit der gewünschten Präzision den radiologischen Ergebnissen und Bildern und damit indirekt auch den Verhältnissen in vivo anzupassen. Als Alternative verwendeten wir ungewöhnlich dicke (350 – 440 µm) Gallozyanin- (Nissl) gefärbte Serienschnitte durch die Gehirne (ZNS) von drei Personen im Alter von 56, 68 und 36 Jahren. Bei einem Fall wurde das ZNS post mortem mit einem Kernspintomographen vor der Entnahme gescannt. Die Serienschnitte durch dieses Gehirn und das eines zweiten und dritten nicht-gescannten Falles wurden mit Gallozyanin gefärbt, die zytoarchitektonischen Grenzen des Thalamuskomplexes und seiner Unterkerne wurden nach Hassler (1982) identifiziert, jede ihrer Grenzen mit dem Cursor eines Graphiktabletts umfahren und die Gestalt des Thalamuskomplexes und seiner Unterkerne mit Hilfe von Photoshop CS5® und eines computergestützten 3D-Rekonstruktionsprogramms (Amira®) dargestellt. Im Fall 3 ließen sich nach Dunkelfeldbeleuchten die Verteilung markhaltiger Fasern studieren und die zytoarchitektonischen mit myeloarchitektonischen Befunden erweitern und ergänzen. Zusätzlich konnten im Fall 1 die histologischen Serienschnitte und ihre 3D Rekonstruktion mit dem post mortem in cranio MRT registriert werden. Insgesamt kann dieser methodische Ansatz als eine robuste und relativ einfache wenn auch mit umfangreicherer manueller Tätigkeit verbundene Technik zur sehr detailreichen unverformten Korrelation zytoarchitektonischer und kernspinotomographsicher Darstellung des Thalamuskomplexus und seiner Unterkerne angesehen werden. Sie könnte als Grundlage für die Herausgabe eines multimedialen 3D stereotaktischen Atlas des menschlichen Gehirns dienen.
Incidence rates of infections caused by environmental opportunistic fungi have risen over recent decades. Aspergillus species have emerged as serious threat for the immunecompromised, and detailed knowledge about virulence-determining traits is crucial for drug target identification. As a prime saprobe, A. fumigatus has evolved to efficiently adapt to various stresses and to sustain nutritional supply by osmotrophy, which is characterized by extracellular substrate digestion followed by efficient uptake of breakdown products that are then fed into the fungal primary metabolism. These intrinsic metabolic features are believed to be related with its virulence ability. The plethora of genes that encode underlying effectors has hampered their in-depth analysis with respect to pathogenesis. Recent developments in Aspergillus molecular biology allow conditional gene expression or comprehensive targeting of gene families to cope with redundancy. Furthermore, identification of essential genes that are intrinsically connected to virulence opens accurate perspectives for novel targets in antifungal therapy.
Malaria and HIV are among the most important global health problems of our time and together are responsible for approximately 3 million deaths annually. These two diseases overlap in many regions of the world including sub-Saharan Africa, Southeast Asia and South America, leading to a higher risk of co-infection. In this study, we generated and characterized hybrid molecules to target P. falciparum and HIV simultaneously for a potential HIV/malaria combination therapy. Hybrid molecules were synthesized by covalent fusion between azidothymidine (AZT) and dihydroartemisinin (DHA), tetraoxane or chloroquine (CQ); and a small library was generated and tested for antiviral and antimalarial activity. Our data suggest that dihyate is the most potent molecule in vitro, with antiplasmodial activity comparable to that of DHA (IC50 = 26 nM, SI > 3000), a moderate activity against HIV (IC50 = 2.9 µM; SI > 35) and safe to HeLa cells at concentrations used in the assay (CC50 > 100 µM). Pharmacokinetic studies further revealed that dihyate is metabolically unstable and is cleaved following an O-dealkylation once in contact with cytochrome P450 enzymes. The later further explains the uneffectiveness of dihyate against the CQ-sensitive P. berghei N strain in mice when administered by oral route at 20 mg/kg. Here, we report on a first approach to develop antimalarial/anti-HIV hybrid molecules and future optimization efforts will aim at producing second generation hybrid molecules to improve activity against HIV as well as compound bioavailability. With the emergence of resistant parasites against all the counterpart drugs of artemisinin derivatives used in artemisinin based combination therapies (ACTs), the introduction of antibiotics in the treatment of malaria has renewed interest on the identification of antibiotics with potent antimalarial properties. In this study we also investigated the antiplasmodial potential of thiostrepton and derivatives, synthesized using combinations of tail truncation, oxidation, and addition of lipophilic thiols to the terminal dehydroamino acid. We showed that derivatives SS231 and SS234 exhibit a better antiplasmodial activity (IC50 = 1 µM SI > 59 and SI > 77 respectively) than thiostrepton (IC50 = 8.95 µM, SI = 1.7). The antiplasmodial activity of these derivatives was observed at concentrations which are not hemolytic and non-toxic to human cell lines. Thiostrepton and derivatives appeared to exhibit transmission blocking properties when administered at their IC50 or IC90 concentrations and our data also showed that they attenuate proteasome activity of Plasmodium, which resulted in an accumulation of ubiquitinated proteins after incubation with their IC80 concentrations. Our results indicate that the parasite’s proteasome could be an attractive target for therapeutic intervention. In this regard, thiostrepton derivatives are promising candidates by dually acting on two independent targets, the proteasome and the apicoplast, with the capacity to eliminate both intraerythrocytic asexual and transmission stages of the parasite. To further support our findings, we evaluated the activity of a new class of antimalarial and proteasome inhibitors namely peptidyl sulfonyl fluorides on gametocyte maturation and analogues AJ34 and AJ38 were able to completely suppress gametocytogenesis at IC50 concentrations (0.23 µM and 0.17 µM respectively) suggesting a strong transmission blocking potential. The proteasome, a major proteolytic complex, responsible for the degradation and re-cycling of non-functional proteins has been studied only indirectly in P. falciparum. In addition, an apparent proteasome-like protein with similarity to bacterial ClpQ/hslV threonine-peptidases was predicted in the parasite. Antibodies were generated against the proteasome subunits alpha type 5 (α5-SU), beta type 5 (β5-SU) and pfhslV in mice and we showed that the proteasome is expressed in both sexual and asexual blood stages of P. falciparum, where they localize in the nucleus and in the cytoplasm. However, expression of PfhslV was only observed in trophozoites and shizonts. The trafficking of the studied proteasome subunits was further investigated by generating parasites expressing GFP tagged proteins. The expression of α5-SU-GFP in transgenic parasite appeared to localize abundantly in the cytoplasm of all blood stages, and no additional information was obtained from this parasite line. In conclusion, our data highlight two new tools towards combination therapy. Hybrid molecules represent promising tools for the cure of co-infected individuals, while very potent antibiotics with a wide scope of activities could be useful in ACTs by eliminating resistant parasites and limiting transmission of both, resistances and disease.
Nach wie vor ist die Zahl der Malaria-Neuerkrankungen mit ca. 500 Millionen Menschen weltweit sehr besorgniserregend. Durch zunehmende Resistenzen der Erreger gegen zahlreiche Arzneimittel wird die Situation zusätzlich verschärft. Daher ist die Suche und Entwicklung neuartiger Medikamente wichtiger denn je. Die Natur ist immer noch das größte Reservoir an neuen Wirkstoffen, welche als Leitstrukturen für Arzneistoffe fungieren. In den letzten Jahren wurde eine große Zahl neuartiger, biologisch aktiver Naturstoffe identifiziert und hinsichtlich ihres Potenzials für eine pharmazeutische Weiterentwicklung analysiert. Die Naphthylisochinolin-Alkaloide gehören zu solch einer vielversprechenden Wirkstoffklasse, da sie sich v.a. durch ihre hervorragenden pharmakologischen Eigenschaften auszeichnen. Kürzlich wurden die ersten N,C-gekuppelten Naphthyldihydroisochinolin-Alkaloide, Ancistrocladinium A und B, entdeckt. Diese Verbindungen weisen als strukturelle Besonderheit eine außergewöhnliche Iminium-Aryl-Achse auf und besitzen zudem exzellente anti-infektive Aktivitäten, insbesondere gegen den Erreger der Orientbeule, Leishmania major. Ziel der vorliegenden Dissertation war die Synthese neuartiger sterisch gehinderter und strukturell vereinfachter Naphthylisochinoline für weiterführende Struktur-Aktivitäts-Beziehungen (SAR-Studien) und die stereochemische Analyse dieser Verbindungen. Zudem sollte eine Syntheseroute zu den neuartigen dimeren C,C-gekuppelten Naphthylisochinolin-Alkaloiden Shuangancistrotectorin A und B entwickelt werden.
Background: Sorbents have been shown to adsorb iodinated radiocontrast media. Objective: In this study we describe a simple method to compare various sorbents in terms of capacity to adsorb radiocontrast media. Methods: Iodixanol solution was injected into columns filled with three types of sorbent at filtration velocities of increasing magnitude. Two variables of interest – contrast removal rate and matched iodine retention (MIR) – were calculated to measure the adsorption efficiency and the mass of contrast iodine adsorbed versus sorbent used, respectively. Results: The highest contrast removal and MIR for Porapak Q, CST 401 and Amberlite XAD4 were 41, 38 and 16% (p = 0.22 and 0.0005 for comparisons between Porapak Q-CST 401 and CST 401-Amberlite XAD4) and 0.060, 0.055 and 0.024, respectively (p = 0.18 and 0.0008). Extrapolation to a clinical scenario may suggest that removal of 8 ml iodixanol could be achieved by masses of sorbents of 43, 47 and 107 g, respectively. Conclusion: In this study we set a benchmark for comparing the radiocontrast-adsorbing efficiency of polymer sorbents during first-pass experiments, using a readily available methodology.
Introduction: Several common alleles have been shown to be associated with breast and/or ovarian cancer risk for BRCA1 and BRCA2 mutation carriers. Recent genome-wide association studies of breast cancer have identified eight additional breast cancer susceptibility loci: rs1011970 (9p21, CDKN2A/B), rs10995190 (ZNF365), rs704010 (ZMIZ1), rs2380205 (10p15), rs614367 (11q13), rs1292011 (12q24), rs10771399 (12p11 near PTHLH) and rs865686 (9q31.2).
Methods: To evaluate whether these single nucleotide polymorphisms (SNPs) are associated with breast cancer risk for BRCA1 and BRCA2 carriers, we genotyped these SNPs in 12,599 BRCA1 and 7,132 BRCA2 mutation carriers and analysed the associations with breast cancer risk within a retrospective likelihood framework.
Results: Only SNP rs10771399 near PTHLH was associated with breast cancer risk for BRCA1 mutation carriers (per-allele hazard ratio (HR) = 0.87, 95% CI: 0.81 to 0.94, P-trend = 3 x 10\(^{-4}\)). The association was restricted to mutations proven or predicted to lead to absence of protein expression (HR = 0.82, 95% CI: 0.74 to 0.90, P-trend = 3.1 x 10\(^{-5}\), P-difference = 0.03). Four SNPs were associated with the risk of breast cancer for BRCA2 mutation carriers: rs10995190, P-trend = 0.015; rs1011970, P-trend = 0.048; rs865686, 2df P = 0.007; rs1292011 2df P = 0.03. rs10771399 (PTHLH) was predominantly associated with estrogen receptor (ER)-negative breast cancer for BRCA1 mutation carriers (HR = 0.81, 95% CI: 0.74 to 0.90, P-trend = 4 x 10\(^{-5}\)) and there was marginal evidence of association with ER- negative breast cancer for BRCA2 mutation carriers (HR = 0.78, 95% CI: 0.62 to 1.00, P-trend = 0.049).
Conclusions: The present findings, in combination with previously identified modifiers of risk, will ultimately lead to more accurate risk prediction and an improved understanding of the disease etiology in BRCA1 and BRCA2 mutation carriers.
Bis(μ-diisopropyl-phosphanido-\(κ^2\)P:P)bis-[hydrido(triisopropyl-phosphane-κP)platinum(II)]
(2012)
In the centrosymmetric molecular structure of the title compound \([Pt_2(C_6H_{14}P)_2H_2)(C_9H_{21}P)_2]\), each \(Pt^{II}\) atom is bound on one side to a phosphane ligand \((PiPr_3)\) and a hydrido ligand. On the other side, it is bound to two phosphanide ligands \((μ-PiPr_2)\), which engage a bridging position between the two \(Pt^{II}\) atoms, forming a distorted square-planar structure motif. The PtPt distance is 3.6755(2)Å. A comparable molecular structure was observed for bis-(μ-di-tert-butyl-phosphanido)bis-[hydrido(triethyl-phosphane)platinum(II)] [Itazaki et al. (2004 ). Organometallics, 23, 1610-1621].
In dieser post-hoc Analyse der Deutschen Diabetes und Dialyse Studie wurde der Einfluss von NT-proBNP und Troponin T auf plötzlichen Herztod, Schlaganfall, Myokardinfarkt und die Gesamtmortalität während vierjähriger Studiendauer bei 1255 Patienten mit Diabetes mellitus Typ 2 an der Hämodialyse analysiert. Des Weiteren wurde die Bedeutung einer longitudinalen Messung der Biomarker nach 6 Monaten auf die Endpunkte untersucht. Patienten mit dem höchsten NT-proBNP respektive Troponin T wiesen die größte Ereignisrate für plötzlichen Herztod, Schlaganfall und die Gesamtmortalität auf. In der multivariaten Regressionsanalyse waren sowohl NT-proBNP als auch Troponin T jeweils starke unabhängige Prädiktoren für plötzlichen Herztod, Schlaganfall und die Gesamtmortalität. Eine Assoziation von NT-proBNP mit dem Auftreten von Myokardinfarkten wurde nicht gesehen. Nicht nur ein hoher Ausgangswert der Biomarker, sondern auch eine Zunahme von NT-proBNP und Troponin T nach 6 Monaten waren assoziiert mit einer schlechteren Langzeitprognose
Animals acquire predictive values of sensory stimuli through reinforcement. In the brain of Drosophila melanogaster, activation of two types of dopamine neurons in the PAM and PPL1 clusters has been shown to induce aversive odor memory. Here, we identified the third cell type and characterized aversive memories induced by these dopamine neurons. These three dopamine pathways all project to the mushroom body but terminate in the spatially segregated subdomains. To understand the functional difference of these dopamine pathways in electric shock reinforcement, we blocked each one of them during memory acquisition. We found that all three pathways partially contribute to electric shock memory. Notably, the memories mediated by these neurons differed in temporal stability. Furthermore, combinatorial activation of two of these pathways revealed significant interaction of individual memory components rather than their simple summation. These results cast light on a cellular mechanism by which a noxious event induces different dopamine signals to a single brain structure to synthesize an aversive memory.
Für die palliative Bestrahlung des NSCLC stehen mehrere, sehr unterschiedliche hypofraktionierte Behandlungsschemata zur Verfügung. Prospektive Studien in der Vergangenheit konnten keine Überlegenheit für eines dieser Regime zeigen. Ziel vorliegender retrospektiver Arbeit war es, die Effektivität der Radiatio mit 13 bis 15 Fraktionen zu 3 Gy zu überprüfen. Hierzu untersuchten wir die Daten von 57 Patienten, die sich in den Jahren 2006 bis 2008 in der Strahlentherapie der Universitätsklinik Würzburg einer solchen Therapie unterzogen. Das Patientengut unterteilten wir für die Untersuchung in zwei Gruppen M0 und M1, deren Prognose wir unterschiedlich einschätzten. Der Einteilung lag das Vorhandensein von Fernmetastasen zu Behandlungsbeginn zugrunde.
Das Gesamtüberleben war für Patienten der M0-Gruppe signifikant besser und lag für M1-Patienten in einem zu erwartenden Bereich. 17,5% unserer Patienten lebten 18 Monate oder länger. Welche Ursachen hinter diesem prolongierten Überleben stehen könnten, blieb jedoch weitgehend unklar.
Für das Gesamtüberleben zeigten sich verschiedene u.a. aus der Literatur bekannte Prognosefaktoren wie das UICC-Stadium, der Allgemeinzustand und eine chemotherapeutische Behandlung. Andere Faktoren, deren Einfluss wir vermuteten, führten zu keinen signifikanten bzw. widersprüchlichen Ergebnissen. Hierzu zählten insbesondere der Charlson comorbidity score und das Alter. Für die Höhe der Gesamtdosis und die Größe des PTV wurde interessanterweise kein Einfluss auf das Überleben nachgewiesen. Die lokale Kontrolle war von diesen beiden Variablen ebenfalls unabhängig.
Ein systemischer Progress trat bei unseren Patienten tendenziell früher auf als ein lokaler Progress.
Der Allgemeinzustand der Patienten wurde von der Bestrahlung im Wesentlichen nicht negativ beeinflusst, Infektionen traten so gut wie gar nicht auf. Wie bereits aus prospektiven Studien zur hypofraktionierten Bestrahlung bekannt, waren Akuttoxizitäten, insbesondere Ösophagitiden, relativ häufig.
Cover contact graphs
(2012)
We study problems that arise in the context of covering certain geometric objects called seeds (e.g., points or disks) by a set of other geometric objects called cover (e.g., a set of disks or homothetic triangles). We insist that the interiors of the seeds and the cover elements are pairwise disjoint, respectively, but they can touch. We call the contact graph of a cover a cover contact graph (CCG). We are interested in three types of tasks, both in the general case and in the special case of seeds on a line: (a) deciding whether a given seed set has a connected CCG, (b) deciding whether a given graph has a realization as a CCG on a given seed set, and (c) bounding the sizes of certain classes of CCG’s. Concerning (a) we give efficient algorithms for the case that seeds are points and show that the problem becomes hard if seeds and covers are disks. Concerning (b) we show that this problem is hard even for point seeds and disk covers (given a fixed correspondence between graph vertices and seeds). Concerning (c) we obtain upper and lower bounds on the number of CCG’s for point seeds.
We have studied the responses of honey bees at different life stages (Apis mellifera) to controlled infection with acute bee paralysis virus and have identified the haemolymph of infected larvae and adult worker bees as the compartment where massive propagation of ABPV occurs. Insects respond with a broad spectrum of induced innate immune reactions to bacterial infections, whereas defence mechanisms based on RNA interference play a major role in antiviral immunity. In this study, we have determined that honey bee larvae and adult workers do not produce a humoral immune reaction upon artificial infection with ABPV, in contrast to control individuals challenged with Escherichia coli. ABPV-infected bees produced neither elevated levels of specific antimicrobial peptides (AMPs), such as hymenoptaecin and defensin, nor any general antimicrobial activity, as revealed by inhibition-zone assays. Additionally, adult bees did not generate melanised nodules upon ABPV infection, an important cellular immune function activated by bacteria and viruses in some insects. Challenge of bees with both ABPV and E. coli showed that innate humoral and cellular immune reactions are induced in mixed infections, albeit at a reduced level.
Durch Fortschritte in der Technologie haben interventionelle Eingriffe am Herzen in den letzten Jahrzehnten einen herausragenden Stellenwert entwickelt und zu einer Reduktion von aufwendigen Operationen am Herzen geführt. Die Ausbildung im Herzkatheterlabor, die nach dem konservativen „appreticeship-model“ erfolgt, gerät in Anbetracht der sinkenden finanziellen Mittel, Zeitmangel und der ethischen Fragen bezüglich Patientensicherheit immer mehr in Diskussion. Die Entwicklung der Virtual-Reality-Simulatoren für Kathetereingriffe bietet hier durch die Realitätsnähe einen Ansatzpunkt für die Möglichkeit eines individuell angepassten, repetitiven Trainings ohne die Gefährdung eines Patienten. Standardsituationen als auch seltene Komplikationen können nachgestellt werden. Diese Studie weist nach, dass Training an den Virtual-Reality-Simulatoren CATHI und Immersion zu einer Risikoreduktioin bei der Durchführung einer perkutanen Coronarintervention führt. Zur Untersuchung der Effekte von Virtual-Reality-Training auf die Performance einer perkutanen Coronarintervention wurde an der medizinischen Klinik Wuerzburg eine kontrolliert-radnomisierte Studie mit 33 Anfängern in der interventionellen Kardiologie durchgeführt. 16 Teilnehmer (Simulationsgruppe) erhielten ein intensives acht-stuendiges Simulationstraining an zwei verschiedenen Virtual-Reality-Simulatoren (CATHI und Immersion), 17 Teilnehmer bildeten die Kontrollgruppe, die den konservativen Ausbildungsgang repräsentierte und kein Simulationstraining erhielt. Alle Teilnehmer mussten in Form einer Prä- und Postevaluation unter realitätsnahen Umständen im Herzkatheterlabor der Uniklinik Würzburg innerhalb von 30 Minuten eine perkutane Coronarintervention an einem pulsatilen Herzkreislaufmodell aus Silikon (CoroSim) eigenständig vornehmen. Dabei musste eine an einer Aufteilung lokalisierte hochgradige Stenose ohne Abgänge mit einer Länge von 10mm und einem Gefäßdurchmesser von 4mm eröffnet werden. Die Ergebnisse zeigten für die Präevaluation keine gruppenspezifischen Unterschiede. Nach dem Simulationstraining zeigte sich eine signifikante Verbesserung der Simulationsgruppe bei der Risikominimierung in Bezug auf Sicherheit bei der Anwendung des Führungskatheters, des Koronardrahts, des Ballon/Stents und bei der KM-Injektion, während sich die Kontrollgruppe in diesen Punkten nicht verbessern konnte. Die aktuelle Studie zeigt, dass Training an den Virtual-Reality-Simulatoren, als Ergänzung zur herkömmlichen Ausbildung, ein hohes Potential für die Optimierung von interventionellen Herzkathetereingriffen verfügt.
Die Auswertung des Patientenkollektivs von 2000 bis 2004 an der Chirurgischen Universitätsklinik Würzburg ergab 63 Patienten (Gruppe 1), die einer Minoramputation und
59 Patienten die einer Minor- mit konsekutiver Majoramputation (Gruppe 2) infolge pAVK unterzogen wurden. Eine Abhängigkeit zwischen Alter und Majornachamputationsrate konnte nicht festgestellt werden, jedoch eine Tendenz beim Einfluss von Comorbiditäten wie Diabetes mellitus und dialysepflichtiger Niereninsuffizienz auf die Wundheilung und Liegedauer.
Die Anzahl an durchgeführten gefäßchirurgischen Eingriffen wie PTA und Bypass-Operation lag in beiden Gruppen mit 65% bzw. 72% im Vergleich zur Literatur im Standardbereich.
Eine hohe Rate an gefäßmedizinischer Diagnostik und Therapie scheint auch bei fortgeschrittener pAVK (Grad IV) erforderlich, um die Notwendigkeit von Amputationen
insbesondere die Anzahl an Majoramputationen zu verringern. Bei hoher und mit Gruppe 1 vergleichbarer Interventionsrate in Gruppe 2 lässt sich allerdings auch erkennen, dass trotz Ausschöpfung dieser Massnahmen die Rate an Majoramputationen und damit des
Beinverlustes hoch ist.
Positiv zu werten ist, dass es bei über 50% der Amputierten ausgereicht hat, eine Amputation im Fussbereich (Minoramputation) durchzuführen. Bei diesen 63 Patienten, war bei 58 Patienten sogar nur ein Eingriff nötig. Ferner handelte es sich bei den Majoramputationen in der Mehrzahl um Unterschenkelamputation, und somit um einen nur partiellen Beinverlust . 76% der durchgeführten ersten Majoramputationen erfolgten in den ersten beiden Monaten nach vorausgegangener Minoramputation, die größte Anzahl innerhalb des ersten Monats. Auch die letzte Amputation, die definitive Versorgung, erfolgte
in den meisten Fällen innerhalb der ersten beiden Monate nach Primäreingriff. Somit ist ein nur unwesentlicher Aufschub bis zur definitiven Versorgung ersichtlich.
Der Versuch einer Konsolidierung der Ischämiefolgen (Gangrän) mittels Minoramputation scheint bei fortgeschrittener pAVK im Stadium IV nach Ausschöpfung der
gefäßmedizinischen Diagnostika und Interventionen somit immer gerechtfertigt, und sollte wenn möglich einer Majoramputation vorgezogen werden.
Die durchschnittliche Krankenhausverweildauer in der Gruppe der Minoramputationen lag bei 28 Tagen, in der Gruppe 2 der Majoramputationen bei 39 Tagen. Die Mortalitätsrate ergibt einen deutlich erhöhten Wert in der Gruppe der Majoramputationen. Die Dreijahresmortalität betrug in der Gruppe der Minoramputationen 20% und der Majoramputationen 58%. Es zeigte sich eine Zunahme der Mortalität mit zunehmender
Amputationshöhe und zunehmender Zahl der Amputationen. Diese Daten lassen sich mit 52 aktuellen Literaturangaben durchaus vergleichen und beweisen die schlechte Prognose für AVK-Patienten, bei denen eine Majoramputation unausweichlich ist.
Insgesamt ist es wichtig, dass ein Team aus Chirurgen, Gefäßchirurgen, Radiologen und Angiologen kooperativ zusammen arbeitet, um dem Patienten, eine für ihn
beste Versorgung anbieten zu können. Hier sollte auch nicht vor einem oft höheren Patientenalter zurückgeschreckt werden, denn häufig konnte gerade bei diesen Patienten durch eine Bypass-Operation eine sonst vermutlich unumgängliche Amputation im Unter- bzw.
Oberschenkelbereich verhindert werden.
Numerous small non-coding RNAs (sRNAs) in bacteria modulate rates of translation initiation and degradation of target mRNAs, which they recognize through base-pairing facilitated by the RNA chaperone Hfq. Recent evidence indicates that the ternary complex of Hfq, sRNA and mRNA guides endoribonuclease RNase E to initiate turnover of both the RNAs. We show that a sRNA not only guides RNase E to a defined site in a target RNA, but also allosterically activates the enzyme by presenting a monophosphate group at the 5′-end of the cognate-pairing “seed.” Moreover, in the absence of the target the 5′-monophosphate makes the sRNA seed region vulnerable to an attack by RNase E against which Hfq confers no protection. These results suggest that the chemical signature and pairing status of the sRNA seed region may help to both ‘proofread’ recognition and activate mRNA cleavage, as part of a dynamic process involving cooperation of RNA, Hfq and RNase E.
Background: Alveolar echinococcosis (AE) is caused by the metacestode stage of Echinococcus multilocularis. Differential diagnosis with cystic echinococcosis (CE) caused by E. granulosus and AE is challenging. We aimed at improving diagnosis of AE on paraffin sections of infected human tissue by immunohistochemical testing of a specific antibody.
Methodology/Principal Findings: We have analysed 96 paraffin archived specimens, including 6 cutting needle biopsies and 3 fine needle aspirates, from patients with suspected AE or CE with the monoclonal antibody (mAb) Em2G11 specific for the Em2 antigen of E. multilocularis metacestodes. In human tissue, staining with mAb Em2G11 is highly specific for E. multilocularis metacestodes while no staining is detected in CE lesions. In addition, the antibody detects small particles of E. multilocularis (spems) of less than 1 mm outside the main lesion in necrotic tissue, liver sinusoids and lymphatic tissue most probably caused by shedding of parasitic material. The conventional histological diagnosis based on haematoxylin and eosin and PAS stainings were in accordance with the immunohistological diagnosis using mAb Em2G11 in 90 of 96 samples. In 6 samples conventional subtype diagnosis of echinococcosis had to be adjusted when revised by immunohistology with mAb Em2G11.
Conclusions/Significance: Immunohistochemistry with the mAb Em2G11 is a new, highly specific and sensitive diagnostic tool for AE. The staining of small particles of E. multilocularis (spems) outside the main lesion including immunocompetent tissue, such as lymph nodes, suggests a systemic effect on the host.
The neurodegenerative disorder Alzheimer's disease (AD) is the cause of approximately 60% of the world's 35 million patients suffering from dementia. Current research focuses here are on association with other diseases such as diabetes type 2 (T2DM), possible genetic markers, specific signal transduction pathways within the brain and potential protein modification, because the pathogenesis and etiology of AD are still not fully understood. Specifically association of T2DM with AD came to the focus with the so-called "Rotterdam study" in 1999, indicating that T2DM doubles the risk of developing AD. In the meantime, it is known that the prevalence rate in patients with T2DM is 30%. Drugs commonly used in the treatment of T2DM such as peroxisome proliferator-activated receptors gamma (PPARγ) agonists show improvement of the cognitive abilities in patients with early stage of dementia, with potential therapeutically relevance. Therefore it is important not only to investigate a link between these diseases, but also to investigate the insulin signaling pathway in the brain of AD patients. In order to investigate this complex issue in more details and demonstrate additional links between T2DM and AD, the present study used several basic biological methods to clarify the question: "Is impaired insulin signaling pathway within the brain crucial for the development of AD?" from several points of view. The methods used in this work have been i) an analysis of single nucleotide (SNP) polymorphism of the insulin-degrading enzyme gene (IDE) in relation to risk of AD and / or of T2DM, ii) post-mortem histochemical studies of brain tissue of patients with only AD, with AD combined with T2DM and with only T2DM compared with an age-matched control group, and iii.) investigations of neurochemical pathways and gene/protein expression changes of a human cell culture as a consequences of amyloid β (Aβ) treatment. After analysis of the IDE SNP polymorphism in the selected VITA (Vienna Trans Danube Aging) cohort disease-specific effects were discovered. The upstream polymorphism (IDE2) was found to influence AD risk in a protective manner, while the downstream polymorphism (IDE7) modified the T2DM risk. Based on the SNP results, the presented study delineate the model that IDE promoter and 3‟ untranslated region/downstream variation can have different effects on IDE expression, maybe a relevant endophenotype with disorder-specific effects on AD and T2DM susceptibility. Furthermore, the human post-mortem studies could show that both AD as well as T2DM patients had a significantly lower density of the insulin receptor (IR) in the hippocampus, whereas a significantly increased density of inactive phosphorylated PPARγ has been found and this persisted even in patients with both diseases. Summarizing the histological study, it was possible to reveal common histological features of AD and T2DM, but no direct connection between the two diseases. Although AD is nowadays not only characterized by amyloid-containing plaque deposits and by the hyperphosphorylation of tau protein, the excessive Aβ42 presence in the brains of AD patients is still playing a key role. Up to date it is still not entirely clear which physical form of Aβ42 is responsible for the development of AD. The present work investigated, what impact has the state of aggregation of Aβ42 on genes and proteins of the insulin signaling pathway and the amyloid cascade. It could be shown that the oligomeric variant enhanced specifically the gene and protein expression of glycogen synthase kinase (GSK) 3β and also the enzyme activity was significantly increased, but has in turn strongly inhibited the IR gene and protein expression. Additionally, the effect of Aβ42 on monoamine oxidase B (MAO-B) was examined. An effect of both aggregated forms of Aβ42 had on enzyme activity was discovered. However, the fibrillar variants led to significantly increased activity of MAO-B while the oligomeric variants inhibited the enzyme activity. Several previous studies have demonstrated the involvement of increased MAO-B activity in AD, but the present work provides for the first time a direct link between the states of aggregation of Aβ42 to enzyme activity. Finally the results of the presented thesis can be summarized to following conclusion: Although AD and T2DM sharing some degrees of common features, still there is a lack of direct association, and therefore the diseases must be considered more independent rather than linked. But the impaired cerebral insulin signaling pathway seems to be another manifested hallmark of AD.
This thesis focuses on various aspects and techniques of 19F magnetic resonance (MR). The first chapters provide an overview of the basic physical properties, 19F MR and MR sequences related to this work. Chapter 5 focuses on the application of 19F MR to visualize biological processes in vivo using two different animal models. The dissimilar models underlined the wide applicability of 19F MR in preclinical research. A subsection of Chapter 6 shows the application of compressed sensing (CS) to 19F turbo-spin-echo chemical shift imaging (TSE-CSI), which leads to reduced measurement time. CS, however, can only be successfully applied when a sufficient signal-to-noise ratio (SNR) is available. When the SNR is low, so-called spike artifacts occur with the CS algorithm used in the present work. However, it was shown in an additional subsection that these artifacts can be reduced using a CS-based post processing algorithm. Thus, CS might help overcome limitations with time consuming 19F CSI experiments. Chapter 7 deals with a novel technique to quantify the B+1 profile of an MR coil. It was shown that, using a specific application scheme of off resonant pulses, Bloch-Siegert (BS)-based B+1 mapping can be enabled using a Carr Purcell Meiboom Gill (CPMG)-based TSE sequence. A fast acquisition of the data necessary for B+1 mapping was thus enabled. In the future, the application of BS-CPMG-TSE B+1 mapping to improve quantification using 19F MR could therefore be possible.
Es wurden Übergangsmetallkomplexe der Metalle Rhodium, Palladium und Platin synthetisiert und unter anderem in Bezug auf ihre Reaktivität als Lewis-Basen untersucht. Hierfür wurden Lewis-Addukte mit Aluminiumtrichlorid mit experimentellen und quantenchemischen Methoden umfassend untersucht. Des Weiteren wurde die Reaktivität von verschiedenen Fluorboranen gegnüber Lewis-basischen Übergangsmetallkomplexen untersucht. Auch konnte die Reaktivität von Münzgruppenmetall-Halogen-Bindungen gegenüber Lewis-Basen analysiert werden. So konnten nicht nur Insertionsprodukte, sondern auch kationische Metal-Only Lewis Pairs, unter anderem anhand von Einkristallröntgenstrukturanalysen und Dichte-Funktional-Theorie Rechnungen, untersucht werden.
This work takes a close look at several quite different research areas related to the design of networked embedded sensor/actuator systems. The variety of the topics illustrates the potential complexity of current sensor network applications; especially when enriched with actuators for proactivity and environmental interaction. Besides their conception, development, installation and long-term operation, we'll mainly focus on more "low-level" aspects: Compositional hardware and software design, task cooperation and collaboration, memory management, and real-time operation will be addressed from a local node perspective. In contrast, inter-node synchronization, communication, as well as sensor data acquisition, aggregation, and fusion will be discussed from a rather global network view. The diversity in the concepts was intentionally accepted to finally facilitate the reliable implementation of truly complex systems. In particular, these should go beyond the usual "sense and transmit of sensor data", but show how powerful today's networked sensor/actuator systems can be despite of their low computational performance and constrained hardware: If their resources are only coordinated efficiently!
Background: Cytokines such as interleukin 6 (IL-6) have been implicated in dual functions in neuropsychiatric disorders. Little is known about the genetic predisposition to neurodegenerative and neuroproliferative properties of cytokine genes. In this study the potential dual role of several IL-6 polymorphisms in brain morphology is investigated.
Methodology: In a large sample of healthy individuals (N = 303), associations between genetic variants of IL-6 (rs1800795; rs1800796, rs2069833, rs2069840) and brain volume (gray matter volume) were analyzed using voxel-based morphometry (VBM). Selection of single nucleotide polymorphisms (SNPs) followed a tagging SNP approach (e. g., Stampa algorigthm), yielding a capture 97.08% of the variation in the IL-6 gene using four tagging SNPs. Principal findings/results In a whole-brain analysis, the polymorphism rs1800795 (-174 C/G) showed a strong main effect of genotype (43 CC vs. 150 CG vs. 100 GG; x = 24, y = -10, z = -15; F(2,286) = 8.54, p(uncorrected) = 0.0002; p(AlphaSim-corrected) = 0.002; cluster size k = 577) within the right hippocampus head. Homozygous carriers of the G-allele had significantly larger hippocampus gray matter volumes compared to heterozygous subjects. None of the other investigated SNPs showed a significant association with grey matter volume in whole-brain analyses.
Conclusions/significance: These findings suggest a possible neuroprotective role of the G-allele of the SNP rs1800795 on hippocampal volumes. Studies on the role of this SNP in psychiatric populations and especially in those with an affected hippocampus (e.g., by maltreatment, stress) are warranted.
We perform global fits to the parameters of the Constrained Minimal Super-symmetric Standard Model (CMSSM) and to a variant with non-universal Higgs masses (NUHM1). In addition to constraints from low-energy precision observables and the cosmological dark matter density, we take into account the LHC exclusions from searches in jets plus missing transverse energy signatures with about 5 fb\(^{−1}\) of integrated luminosity. We also include the most recent upper bound on the branching ratio B\(_s\) → μμ from LHCb. Furthermore, constraints from and implications for direct and indirect dark matter searches are discussed. The best fit of the CMSSM prefers a light Higgs boson just above the experimentally excluded mass. We find that the description of the low-energy observables, (g − 2)\(_μ\) in particular, and the non-observation of SUSY at the LHC become more and more incompatible within the CMSSM. A potential SM-like Higgs boson with mass around 126 GeV can barely be accommodated. Values for B(B\(_s\)→μμ) just around the Standard Model prediction are naturally expected in the best fit region. The most-preferred region is not yet affected by limits on direct WIMP searches, but the next generation of experiments will probe this region. Finally, we discuss implications from fine-tuning for the best fit regions.
Background
Therapeutic vaccination directed to induce an anti-tumoral T-cell response is a field of extensive investigation in the treatment of melanoma. However, many vaccination trials in melanoma failed to demonstrate a correlation between the vaccine-specific immune response and therapy outcome. This has been mainly attributed to immune escape by antigen loss, rendering us in the need of new vaccination targets.
Patients and methods
This phase-II trial investigated a peptide vaccination against survivin, an oncogenic inhibitor-of-apoptosis protein crucial for the survival of tumor cells, in HLA-A1/-A2/-B35-positive patients with treatment-refractory stage-IV metastatic melanoma. The study endpoints were survivin-specific T-cell reactivity (SSTR), safety, response, and survival (OS).
Results
Sixty-one patients (ITT) received vaccination therapy using three different regimens. 55 patients (PP) were evaluable for response and survival, and 41/55 for SSTR. Patients achieving progression arrest (CR + PR + SD) more often showed SSTRs than patients with disease progression (p = 0.0008). Patients presenting SSTRs revealed a prolonged OS (median 19.6 vs. 8.6 months; p = 0.0077); multivariate analysis demonstrated SSTR as an independent predictor of survival (p = 0.013). The induction of SSTRs was associated with gender (female vs. male; p = 0.014) and disease stage (M1a/b vs. M1c; p = 0.010), but not with patient age, HLA type, performance status, or vaccination regimen.
Conclusion
Survivin-specific T-cell reactivities strongly correlate with tumor response and patient survival, indicating that vaccination with survivin-derived peptides is a promising treatment strategy in melanoma.
Background
Therapeutic vaccination directed to induce an anti-tumoral T-cell response is a field of extensive investigation in the treatment of melanoma. However, many vaccination trials in melanoma failed to demonstrate a correlation between the vaccine-specific immune response and therapy outcome. This has been mainly attributed to immune escape by antigen loss, rendering us in the need of new vaccination targets.
Patients and methods
This phase-II trial investigated a peptide vaccination against survivin, an oncogenic inhibitor-of-apoptosis protein crucial for the survival of tumor cells, in HLA-A1/-A2/-B35-positive patients with treatment-refractory stage-IV metastatic melanoma. The study endpoints were survivin-specific T-cell reactivity (SSTR), safety, response, and survival (OS).
Results
Sixty-one patients (ITT) received vaccination therapy using three different regimens. 55 patients (PP) were evaluable for response and survival, and 41/55 for SSTR. Patients achieving progression arrest (CR + PR + SD) more often showed SSTRs than patients with disease progression (p = 0.0008). Patients presenting SSTRs revealed a prolonged OS (median 19.6 vs. 8.6 months; p = 0.0077); multivariate analysis demonstrated SSTR as an independent predictor of survival (p = 0.013). The induction of SSTRs was associated with gender (female vs. male; p = 0.014) and disease stage (M1a/b vs. M1c; p = 0.010), but not with patient age, HLA type, performance status, or vaccination regimen.
Conclusion
Survivin-specific T-cell reactivities strongly correlate with tumor response and patient survival, indicating that vaccination with survivin-derived peptides is a promising treatment strategy in melanoma.
Background: Tardigrades are multicellular organisms, resistant to extreme environmental changes such as heat, drought, radiation and freezing. They outlast these conditions in an inactive form (tun) to escape damage to cellular structures and cell death. Tardigrades are apparently able to prevent or repair such damage and are therefore a crucial model organism for stress tolerance. Cultures of the tardigrade Milnesium tardigradum were dehydrated by removing the surrounding water to induce tun formation. During this process and the subsequent rehydration, metabolites were measured in a time series by GC-MS. Additionally expressed sequence tags are available, especially libraries generated from the active and inactive state. The aim of this integrated analysis is to trace changes in tardigrade metabolism and identify pathways responsible for their extreme resistance against physical stress. Results: In this study we propose a novel integrative approach for the analysis of metabolic networks to identify modules of joint shifts on the transcriptomic and metabolic levels. We derive a tardigrade-specific metabolic network represented as an undirected graph with 3,658 nodes (metabolites) and 4,378 edges (reactions). Time course metabolite profiles are used to score the network nodes showing a significant change over time. The edges are scored according to information on enzymes from the EST data. Using this combined information, we identify a key subnetwork (functional module) of concerted changes in metabolic pathways, specific for de- and rehydration. The module is enriched in reactions showing significant changes in metabolite levels and enzyme abundance during the transition. It resembles the cessation of a measurablemetabolism (e.g. glycolysis and amino acid anabolism) during the tun formation, the production of storage metabolites and bioprotectants, such as DNA stabilizers, and the generation of amino acids and cellular components from monosaccharides as carbon and energy source during rehydration. Conclusions: The functional module identifies relationships among changed metabolites (e.g. spermidine) and reactions and provides first insights into important altered metabolic pathways. With sparse and diverse data available, the presented integrated metabolite network approach is suitable to integrate all existing data and analyse it in a combined manner.
It is of interest to define bacterial toxin biochemical properties to use them as molecular-syringe devices in order to deliver enzymatic activities into host cells. Binary toxins of the AB7/8-type are among the most potent and specialized bacterial protein toxins. The B subunits oligomerize to form a pore that binds with high affinity host cell receptors and the enzymatic A subunit. This allows the endocytosis of the complex and subsequent injection of the A subunit into the cytosol of the host cells. Here we report that the addition of an N-terminal His6-tag to different proteins increased their binding affinity to the protective antigen (PA) PA63-channels, irrespective if they are related (C2I) or unrelated (gpJ, EDIN) to the AB7/8-family of toxins. His6-EDIN exhibited voltage-dependent increase of the stability constant for binding by a factor of about 25 when the trans-side corresponding to the cell interior was set to 270 mV. Surprisingly, the C. botulinum toxin C2II-channel did not share this feature of PA63. Cell-based experiments demonstrated that addition of an N-terminal His6-tag promoted also intoxication of endothelial cells by C2I or EDIN via PA63. Our results revealed that addition of His6-tags to several factors increase their binding properties to PA63 and enhance the property to intoxicate cells.
Background: Hyperactivity is one of the core symptoms in attention deficit hyperactivity disorder (ADHD). However, it remains unclear in which way the motor system itself and its development are affected by the disorder. Movement-related potentials (MRP) can separate different stages of movement execution, from the programming of a movement to motor post-processing and memory traces. Pre-movement MRP are absent or positive during early childhood and display a developmental increase of negativity.
Methods: We examined the influences of response-speed, an indicator of the level of attention, and stimulant medication on lateralized MRP in 16 children with combined type ADHD compared to 20 matched healthy controls.
Results: We detected a significantly diminished lateralisation of MRP over the pre-motor and primary motor cortex during movement execution (initial motor potential peak, iMP) in patients with ADHD. Fast reactions (indicating increased visuo-motor attention) led to increased lateralized negativity during movement execution only in healthy controls, while in children with ADHD faster reaction times were associated with more positive amplitudes. Even though stimulant medication had some effect on attenuating group differences in lateralized MRP, this effect was insufficient to normalize lateralized iMP amplitudes.
Conclusions: A reduced focal (lateralized) motor cortex activation during the command to muscle contraction points towards an immature motor system and a maturation delay of the (pre-) motor cortex in children with ADHD. A delayed maturation of the neuronal circuitry, which involves primary motor cortex, may contribute to ADHD pathophysiology.
Primary osteoporosis is an age-related disease characterized by an imbalance in bone homeostasis. While the resorptive aspect of the disease has been studied intensely, less is known about the anabolic part of the syndrome or presumptive deficiencies in bone regeneration. Multipotent mesenchymal stem cells (MSC) are the primary source of osteogenic regeneration. In the present study we aimed to unravel whether MSC biology is directly involved in the pathophysiology of the disease and therefore performed microarray analyses of hMSC of elderly patients (79-94 years old) suffering from osteoporosis (hMSC-OP). In comparison to age-matched controls we detected profound changes in the transcriptome in hMSC-OP, e.g. enhanced mRNA expression of known osteoporosis-associated genes (LRP5, RUNX2, COL1A1) and of genes involved in osteoclastogenesis (CSF1, PTH1R), but most notably of genes coding for inhibitors of WNT and BMP signaling, such as Sclerostin and MAB21L2. These candidate genes indicate intrinsic deficiencies in self-renewal and differentiation potential in osteoporotic stem cells. We also compared both hMSC-OP and non-osteoporotic hMSC-old of elderly donors to hMSC of similar to 30 years younger donors and found that the transcriptional changes acquired between the sixth and the ninth decade of life differed widely between osteoporotic and non-osteoporotic stem cells. In addition, we compared the osteoporotic transcriptome to long term-cultivated, senescent hMSC and detected some signs for pre-senescence in hMSC-OP. Our results suggest that in primary osteoporosis the transcriptomes of hMSC populations show distinct signatures and little overlap with non-osteoporotic aging, although we detected some hints for senescence-associated changes. While there are remarkable inter-individual variations as expected for polygenetic diseases, we could identify many susceptibility genes for osteoporosis known from genetic studies. We also found new candidates, e.g. MAB21L2, a novel repressor of BMP-induced transcription. Such transcriptional changes may reflect epigenetic changes, which are part of a specific osteoporosis-associated aging process.
Natalizumab is a recombinant monoclonal antibody raised against integrin alpha-4 (CD49d). It is approved for the treatment of patients with multiple sclerosis (MS), a chronic inflammatory autoimmune disease of the CNS. While having shown high therapeutic efficacy, treatment by natalizumab has been linked to progressive multifocal leukoencephalopathy (PML) as a serious adverse effect. Furthermore, drug cessation sometimes induces rebound disease activity of unknown etiology. Here we investigated whether binding of this adhesion-blocking antibody to T lymphocytes could modulate their phenotype by direct induction of intracellular signaling events. Primary CD4+ T lymphocytes either from healthy donors and treated with natalizumab in vitro or from MS patients receiving their very first dose of natalizumab were analyzed. Natalizumab induced a mild upregulation of IL-2, IFN-c and IL-17 expression in activated primary human CD4+ T cells propagated ex vivo from healthy donors, consistent with a pro-inflammatory costimulatory effect on lymphokine expression. Along with this, natalizumab binding triggered rapid MAPK/ERK phosphorylation. Furthermore, it decreased CD49d surface expression on effector cells within a few hours. Sustained CD49d downregulation could be attributed to integrin internalization and degradation. Importantly, also CD4+ T cells from some MS patients receiving their very first dose of natalizumab produced more IL-2, IFN-c and IL-17 already 24 h after infusion. Together these data indicate that in addition to its adhesion-blocking mode of action natalizumab possesses mild direct signaling capacities, which can support a pro-inflammatory phenotype of peripheral blood T lymphocytes. This might explain why a rebound of disease activity or IRIS is observed in some MS patients after natalizumab cessation.
Spin-Bahn-Kopplung in Grenzschichten: Mikroskopische Zusammenhänge und Strategien zur Manipulation
(2012)
Die vorliegende Arbeit befasst sich mit dem Einfluss der Spin-Bahn-Kopplung (SBK) auf die zweidimensionale elektronische Struktur von Festkörperoberflächen und -grenzflächen. Aufgrund der strukturellen Inversionsasymmetrie kann die SBK in derartigen Systemen eine Spinaufspaltung der elektronischen Zustände herbeiführen und eine charakteristische impulsabhängige Spinstruktur induzieren (Rashba-Effekt). Die Studien in dieser Arbeit sind zum einen darauf gerichtet, das physikalische Verständnis der mikroskopischen Zusammenhänge, die die Spinaufspaltung und die Spinorientierung elektronischer Zustände an Grenzflächen bestimmen, zu verbessern. Des Weiteren sollen Möglichkeiten zur Manipulation der SBK durch kontrollierte Variationen chemischer und struktureller Grenzflächenparameter erforscht werden. Als Modellsysteme für diese Fragestellungen dienen die isostrukturellen Oberflächenlegierungen BiCu2 und BiAg2, deren elektronische Struktur mittels winkelaufgelöster Photoelektronenspektroskopie (ARPES) und spinaufgelöster ARPES untersucht wird. Die Resultate der Experimente werden mithilfe von ab initio-Rechnungen und einfacheren Modellbetrachtungen interpretiert. Die Arbeit schließt mit einer ausblickenden Präsentation von Experimenten zu dem topologischen Isolator Bi2Se3(0001). Vergleichende ARPES-Messungen zu BiAg2/Ag(111) und BiCu2/Cu(111) zeigen, dass bereits geringe Unterschiede in der Grenzschichtmorphologie die Größe der Spinaufspaltung in der elektronischen Struktur um ein Vielfaches verändern können. Zudem belegen spinaufgelöste Experimente eine invertierte Spinorientierung der elektronischen Zustände in BiCu2 im Vergleich mit dem Referenzsystem Au(111). Beide Resultate können durch eine theoretische Analyse des Potentialprofils und der elektronischen Ladungsverteilung senkrecht zu der Grenzfläche in Kombination mit einfachen Modellbetrachtungen verstanden werden. Es stellt sich heraus, dass Asymmetrien in der Ladungsverteilung das direkte mikroskopische Bindeglied zwischen der Spinstruktur des elektronischen Systems und den strukturellen und chemischen Parametern der Grenzschicht bilden. Weitergehende ARPES-Experimente zeigen, dass die spinabhängige elektronische Struktur zudem signifikant durch die Symmetrie des Potentials parallel zu der Grenzflächenebene beeinflusst wird. Eine Manipulation der SBK wird in BiCu2 durch die Deposition von Adatomen erreicht. Hierdurch gelingt es, die Spinaufspaltung sowohl zu vergrößern (Na-Adsorption) als auch zu verringern (Xe-Adsorption). ARPES-Experimente an dem ternären Schichtsystem BiAg2/Ag/Au(111) belegen erstmalig eine Kopplung zwischen elektronischen Bändern mit entgegengesetztem Spincharakter in einem zweidimensionalen System mit Spinaufspaltung (Interband-Spin-Bahn-Kopplung). Der zugrundeliegende Kopplungsmechanismus steht in bemerkenswerter Analogie zu den Auswirkungen der SBK auf die spinpolarisierte elektronische Struktur in ferromagnetischen Systemen. Variationen in der Schichtdicke des Ag-Substratfilms erlauben es, die Stärke der Interband-SBK zu manipulieren.