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Institute
- Graduate School of Life Sciences (1034)
- Theodor-Boveri-Institut für Biowissenschaften (101)
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- Julius-von-Sachs-Institut für Biowissenschaften (25)
Sonstige beteiligte Institutionen
- Helmholtz Institute for RNA-based Infection Research (HIRI) (7)
- Universitätsklinikum Münster (3)
- Rudolf Virchow Center for Integrative and Translational Bioimaging, University of Würzburg (2)
- Zentrum für Infektionsforschung (ZINF) Würzburg (2)
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- Biomedical Center Munich, Department of Physiological Chemistry, Ludwig-Maximilians-Universität München (1)
- CAPES - Coordenação de Aperfeiçoamento de Pessoal de Nível Superior - the development agency of the Brazilian Federal Government (1)
- CBIO, University of Cape Town, South Africa (1)
- Carl-Ludwig-Institut für Physiologie, Universität Leipzig (1)
- Chair of Experimental Biomedicine I (1)
Ceramide sind biologisch aktive Sphingolipide, die verschiedene zelluläre Signalwege regulieren, meist im Zusammenhang mit der Induktion von Apoptose oder der Regulation des Zellzyklus. Darüber hinaus wurde in der Literatur beschrieben, dass Ceramide die Zytoskelettdynamik unterschiedlicher Zelltypen beeinflussen, die Bedeutung von Ceramiden für die Funktion von T-Zellen wurde allerdings bisher wenig untersucht. In der vorliegenden Arbeit konnte gezeigt werden, dass die exogene Akkumulation von Ceramiden ebenso wie die Generierung von Ceramiden durch bSMase die Adhärenz von T-Zellen an FN bzw. ICAM-1 beeinträchtigt. Des Weiteren konnte eine verminderte T-Zell-Polarisierung auf FN sowie eine reduzierte Chemotaxis und Motilität ceramidmodifizierter T-Zellen in Antwort auf SDF-1 nachgewiesen werden. In Übereinstimmung mit der Unfähigkeit ceramidmodifizierter Zellen morphologisch zu polarisieren wird ferner die Relokalisation von Oberflächenmolekülen und intrazellulärer Proteine durch die Akkumulation von Ceramiden gestört. Überdies konnte in dieser Arbeit gezeigt werden, dass Ceramide mit dem Aktivierungsstatus von Akt und ERM-Proteinen interferieren, da eine verminderte stimulationsabhängige Phosphorylierung von Akt und ERM-Proteinen in ceramidmodifizierten Zellen nachgewiesen wurde. Ein wesentlicher Schritt im Verlauf der T-Zell-Aktivierung ist die Ausbildung einer immunologischen Synapse mit dendritischen Zellen. In dieser Arbeit konnte gezeigt werden, dass, obwohl ceramidreiche Membrandomänen von der Kontaktstelle ausgeschlossen werden, Konjugatfrequenz und Architektur der IS durch die Induktion von Ceramiden nicht beeinflusst werden, da eine normale Verteilung von CD3 und des MTOC beobachtet wurde. Allerdings wird die Funktionalität der Konjugate durch die Induktion von Ceramiden beeinträchtigt. Ceramidmodifizierte Zellen waren nur eingeschränkt in der Lage Orai1 und Stim1 zur Kontaktfläche mit DCs zu translozieren. In Übereinstimmung mit diesen Befunden wurde auch ein verminderter Calcium-Einstrom sowie eine verminderte Proliferation infolge der Akkumulation von Ceramiden detektiert. Zusammenfassend konnte in dieser Arbeit gezeigt werden, dass Ceramide wesentliche Prozesse im Verlauf der T-Zell-Aktivierung beeinflussen, so dass die pathogeninduzierte Generierung von Ceramiden einen möglichen Mechanismus darstellt, die Funktion von T-Zellen zu beeinträchtigen.
Background: There is extensive evidence that explicit memory, which involves conscious recall of encoded information, can be modulated by emotions; emotions may influence encoding, consolidation or retrieval of information. However, less is known about the modulatory effects of emotions on procedural processes like motor memory, which do not depend upon conscious recall and are instead demonstrated through changes in behaviour. Experiment 1: The goal of the first experiment was to examine the influence of emotions on motor learning. Four groups of subjects completed a motor learning task performing brisk isometric abductions with their thumb. While performing the motor task, the subjects heard emotional sounds varying in arousal and valence: (1) valence negative / arousal low (V-/A-), (2) valence negative / arousal high (V-/A+), (3) valence positive / arousal low (V+/A-), and (4) valence positive / arousal high (V+/A+). Descriptive analysis of the complete data set showed best performances for motor learning in the V-/A- condition, but the differences between the conditions did not reach significance. Results suggest that the interaction between valence and arousal may modulate motor encoding processes. Since limitations of the study cannot be ruled out, future studies with different emotional stimuli have to test the assumption that exposure to low arousing negative stimuli during encoding has a facilitating effect on short term motor memory. Experiment 2: The purpose of the second experiment was to investigate the effects of emotional interference on consolidation of sequential learning. In different sessions, 6 groups of subjects were initially trained on a serial reaction time task (SRTT). To modulate consolidation of the newly learned skill, subjects were exposed, after the training, to 1 of 3 (positive, negative or neutral) different classes of emotional stimuli which consisted of a set of emotional pictures combined with congruent emotional musical pieces or neutral sound. Emotional intervention for each subject group was done in 2 different time intervals (either directly after the training session, or 6 h later). After a 72 h post-training interval, each group was retested on the SRTT. Re-test performance was evaluated in terms of response times and accuracy during performance of the target sequence. Emotional intervention did not influence either response times or accuracy of re-testing SRTT task performance. However, explicit awareness of sequence knowledge was enhanced by arousing negative stimuli applied at 0 h after training. These findings suggest that consolidation of explicit aspects of procedural learning may be more responsive toward emotional interference than are implicit aspects. Consolidation of different domains of skill acquisition may be governed by different mechanisms. Since skill performance did not correlate with explicit awareness we suggest that implicit and explicit modes of SRTT performance are not complementary. Experiment 3: The aim of the third experiment was to analyze if the left hemisphere preferentially controls flexion responses towards positive stimuli, while the right hemisphere is specialized towards extensor responses to negative pictures. To this end, right-handed subjects had to pull or push a joystick subsequent to seeing a positive or a negative stimulus in their left or right hemifield. Flexion responses were faster for positive stimuli, while negative stimuli were associated with faster extensions responses. Overall, performance was fastest when emotional stimuli were presented to the left visual hemifield. This right hemisphere superiority was especially clear for negative stimuli, while reaction times towards positive pictures showed no hemispheric difference. We did not find any interaction between hemifield and response type. Neither was there a triple interaction between valence, hemifield and response type. In our experimental context the interaction between valence and hemifield seems to be stronger than the interaction between valence and motor behaviour. From these results we suppose that under certain conditions a hierarchy scaling of the asymmetry patterns prevails, which might mask any other existing asymmetries.
Schlagwörter: Salmonella , Salmonella enterica , Salmonella typhimurium , Salmonellose , Escherichia coli , Shigella , Infektion , Bakterielle Infektion , Zellkultur , HeLa-Zelle , Apoptosis , Metabolismus , Stoffwechsel , Glucose , Glucosetransport , Glucosestoffwechsel , Katabolismus , Kohlenstoff , Kohlenstoffbedarf , Kohlenstoffhaushalt , Kohlenstoffstoffwechsel , Kohlenstoff-13 , Kohlenstoffisotop Salmonella Typhimurium und enteroinvasive E. coli (EIEC) sind fakultativ intrazelluläre Bakterien aus der Familie der Enterobacteriaceae. Während erstere sich nach der Internalisierung durch eukaryotische Zellen normalerweise in einem spezialisierten Phagosom, der Salmonella-enthaltenden Vakuole (SCV), vermehren, replizieren EIEC im Zytoplasma der Wirtszellen. In der vorliegenden Arbeit wurde zunächst durch Mikroinjektion die Fähigkeit von S. Typhimurium 14028s untersucht, ebenfalls im Zytoplasma von Caco-2-Zellen replizieren zu können. Dabei wurde festgestellt, daß ein früher als S. Typhimurium 14028s WT bezeichneter Stamm eine Insertion eines Desoxythymidins an Position 76 des offenen Leserasters von rfbP trägt, einem Gen, dessen Protein an der LPS-Synthese beteiligt ist. Weiterhin synthetisierte dieser Stamm ein rauhes LPS. Aufgrund von Agglutination konnte der Rauh-Stamm nur mit geringem Erfolg mikroinjiziert werden. Hingegen lag 5 h nach der Mikroinjektion einer nicht invasiven Mutante von Salmonella mit vollständigem LPS der Anteil an Caco-2-Zellen, die mehr als 32 Bakterien enthielten, bei etwa 30 %. Der Anteil war 2-3 mal höher als bei früheren Mikroinjektionen in HeLa-Zellen. Daher wurde das Verhalten von HeLa-Zellen nach einer Infektion durch S. Typhimurium ΔsifA - einer Mutante, die aus der SCV ins Zytoplasma entkommt - untersucht. Dabei wurde festgestellt, daß die sifA-Mutante 10 h nach der Infektion die Aktivität der Caspasen 9 und 3 in HeLa-Zellen, aber nicht in Caco-2-Zellen induziert. In weiteren Versuchen wurde die Bedeutung von Glukose, Glukose-6-phosphat und Mannose als Kohlenstoffquellen für die extra- und intrazelluläre Replikation zweier Isolate enteroinvasiver E. coli und eines S. Typhimurium Stammes analysiert. Zu diesem Zweck wurden zunächst definierte Mutanten in den beiden wichtigsten Phosphoenolpyruvat-abhängigen Phosphotransferasesystemen (PTS) für die Aufnahme von Glukose und Mannose, ptsG und manXYZ, sowie im Antiporter für die Aufnahme von Glukose-6-phosphat, uhpT, konstruiert. Bei Wachstum im Minimalmedium mit Glukose als einziger C-Quelle waren die Generationszeiten aller ΔptsG- und ΔptsG, manXYZ-Mutanten im Vergleich zu den Wildstämmen deutlich verlängert. Ebenso wuchsen ΔmanXYZ-Mutanten bzw. ΔuhpT-Mutanten deutlich langsamer auf Mannose bzw. Glukose-6-phosphat. Jedoch ergaben sich hierbei Stamm-spezifische Unterschiede. So erreichte EIEC 4608-58 ΔuhpT in der stationären Phase eine ähnliche Zelldichte wie der Wildstamm in Gegenwart von Glukose-6-phosphat und eine ΔptsG, manXYZ-Mutante von S. Typhimurium 14028s konnte immer noch effizient mit Glukose wachsen. Infektionsversuche mit Caco-2-Zellen zeigten weiterhin, daß die Deletion von ptsG zu einer signifikanten Erhöhung der Adhärenz und Invasivität von EIEC 4608-58 führt, während sich die intrazellulären Generationszeiten aller hier untersuchten Mutanten kaum veränderten. Selbst die ΔptsG, manXYZ, uhpT-Dreifachmutanten der drei hier verwendeten Enterobakterien und die ΔptsG, manXYZ, glk-Mutante von S. Typhimurium 14028s konnten immer noch in Caco-2-Zellen replizieren, wenn auch mit Stamm-spezifisch verringerten Geschwindigkeiten. 13C-Markierungsexperimente mit [U-13C6]-Glukose als Substrat ergaben jedoch, daß in der Tat alle hier untersuchten enterobakteriellen Wildstämme Glukose während der Replikation in Caco-2-Zellen unter Zellkulturbedingungen verwerten. Glukose-6-phosphat, Glukonat oder Fettsäuren konnten dagegen als wichtigste Kohlenstoffquellen für das intrazelluläre Wachstum ausgeschlossen werden. EIEC 4608-58 metabolisierte Glukose jedoch weniger effizient als EIEC HN280 und schien zudem noch zusätzlich C3-Substrate aus der Wirtszelle aufzunehmen. Das Markierungsmuster zeigte einen Stamm-spezifischen Kohlenstofffluß durch Glykolyse und/oder Entner-Doudoroff-Weg, Pentosephosphatzyklus, Citratzyklus und den anaplerotischen Reaktionen zwischen PEP und Oxalacetat. Mutanten mit Deletionen in ptsG und manXYZ konnten auf alternative C3-Substrate wechseln und glichen dies durch eine erhöhte Aufnahme von Aminosäuren aus den Wirtszellen aus.
The Nuclear Factors of Activated T cells (NFATs) are critical transcription factors playing major roles in the control of the cell cycle, apoptosis and, probably, also cancerogenesis. Of all the four genuine NFATc family members, NFATc1 has the unique induction property which appears to be essential for T and B cell development, along with its considerable role in cytokine gene expression and function in non-lymphoid tissues and during organ development (such as in the development of muscle and heart cells). A number of studies have proved the potential role of NFATc1 protein in development of lymphomas and leukemias and provided evidence of differential expression of the same gene in different tumours (Suppression in classical Hodgkin lymphomas but overexpression in T-ALLs). Although the most commonly accepted pathway is the dephosphorylation of NFAT by calcineurin upon a rise in intracellular Ca++ leading to nuclear translocation followed by transcription of Il2 gene and related cytokines, it is quite possible that signaling mechanisms other than (or in addition to) calcineurin activation lead to NFATc1 induction as well. One of the major isoforms of NFATc1, NFATc1/αA, is the short inducible factor, produced upon full T and B cell activation. Here we used two different conditional knock-out mice as our study model. Inactivation of the murine Nfatc1 gene in bone marrow (of Cd79a/mb-1-cre x Nfatc1flx/flx mice) and spleen (of Cd23-cre x Nfatc1flx/flx mice) resulted in complete ablation of NFATc1 expression in splenic B cells. Although no severe developmental defects were found for the generation of ‘conventional’ B2 cells, NFATc1 inactivation in bone marrow B-cells led to a strong decrease in the peritoneal B1a cell population. In-vitro studies showed a clear-cut decrease in proliferation and an increase in Activation Induced Cell Death (AICD) of NFATc1-/- splenic B cells upon BCR stimulation. While NFATc1 appears to control directly the AICD of peripheral B cells, further studies revealed an effect of NFATc1 on proliferation by a sustained differentiation program controlling Ca++ flux and calcineurin activity which are needed to maintain transcription and proliferation of primary B cells. Re-expression of NFATc1 at a low dose could protect cells against AICD, whereas at a higher dose it initiated AICD. These data suggest an important dual role of NFATc1 in controlling proliferation and apoptosis of peripheral B lymphocytes. NFATc1 ablation also impaired the Ig class switch to IgG3 by T cell-independent (TI) type II antigens and impaired IgG3+ plasmablast formation when studied in-vivo by NP-Ficoll immunization or in-vitro using an in-vitro class-switch model. Contrary to the immunizations with TI-type II antigen, no significant differences were documented in Ig class switch upon immunization with NP-KLH, a T-cell dependent (TD) antigen. Taken together, the data indicate NFATc1/αA as a crucial player in the activation and function of splenic B cells upon BCR stimulation. Missing or incomplete NFATc1/αA induction appears to be one reason for the generation of B cell unresponsiveness, whereas uncontrolled NFATc1/αA expression could lead to unbalanced immune reactions and autoimmune diseases.
BAD (Bcl-2 antagonist of cell death, Bcl-2 associated death promoter) is a pro-apoptotic member of the Bcl-2 protein family that is regulated by phosphorylation in response to survival factors. Although much attention has been devoted to the identification of phosphorylation sites in murine BAD (mBAD), little data are available with respect to phosphorylation of human BAD (hBAD) protein. In this work, we investigated the quantitative contribution of BAD targeting kinases in phosphorylating serines 75, 99 and 118 of hBAD (Chapter 3.1). Our results indicate that RAF kinases phosphorylate hBAD in vivo at these established serine residues. RAF-induced phosphorylation of hBAD was not prevented by MEK inhibitors but could be reduced to control levels by use of the RAF inhibitor Sorafenib (BAY 43-9006). Consistently, expression of active RAF suppressed apoptosis induced by hBAD and the inhibition of colony formation caused by hBAD could be prevented by RAF. In addition, using surface plasmon resonance technique we analyzed the direct consequences of hBAD phosphorylation by RAF with respect to complex formation of BAD with 14-3-3 proteins and Bcl-XL. Phosphorylation of hBAD by active RAF promotes 14-3-3 protein association, whereby the phosphoserine 99 represents the major binding site. Furthermore, we demonstrate in this work that hBAD forms channels in planar bilayer membranes in vitro. This pore-forming capacity is dependent on phosphorylation status and interaction with 14-3-3 proteins. Additionally, we show that hBAD pores possess a funnel-shaped geometry that can be entered by ions and non-charged molecules up to 200 Da (Chapter 3.2). Since both lipid binding domains of hBAD (LBD1 and LBD2) are located within the C-terminal region, we investigated this part of the protein with respect to its structural properties (Chapter 3.3). Our results demonstrate that the C-terminus of hBAD possesses an ordered β-sheet structure in aqueous solution that adopts helical disposition upon interaction with lipid membranes. Additionally, we show that the interaction of the C-terminal segment of hBAD with the BH3 domain results in the formation of permanently open pores, whereby the phosphorylation of serine 118 proved to be necessary for effective pore-formation. In contrast, phosphorylation of serine 99 in combination with 14-3-3 association suppresses formation of channels. These results indicate that the C-terminal part of hBAD controls hBAD function by structural transitions, lipid binding and phosphorylation. Using mass spectrometry we identified in this work, besides the established in vivo phosphorylation sites at serines 75, 99 and 118, several novel hBAD phosphorylation sites (serines 25, 32/34, 97, 124 and 134, Chapter 3.1). To further analyze the regulation of hBAD function, we investigated the role of these newly identified phosphorylation sites on BAD-mediated apoptosis. We found that in contrast to the N-terminal phosphorylation sites, the C-terminal serines 124 and 134 act in an anti-apoptotic manner (Chapter 3.4). Our results further indicate that RAF kinases and PAK1 effectively phosphorylate BAD at serine 134. Notably, in the presence of wild type hBAD, co-expression of survival kinases, such as RAF and PAK1, leads to a strongly increased proliferation, whereas substitution of serine 134 by alanine abolishes this process. Furthermore, we identified hBAD serine 134 to be strongly involved in survival signaling in B-RAF-V600E containing tumor cells and found phosphorylation of this residue to be crucial for efficient proliferation in these cells. Collectively, our findings provide new insights into the regulation of hBAD function by phosphorylation and its role in cancer signaling.
Development of novel Listeria monocytogenes strains as therapeutic agents for targeted tumor therapy
(2010)
Despite marked progress in development and improvement of cancer therapies the rate of cancer related death remained stable over the last years. Especially in treating metastases alternative approaches supporting current therapies are required. Bacterial and viral vectors have been advanced from crude tools into highly sophisticated therapeutic agents detecting and treating neoplastic leasions. They might be potent enough to fill in this therapeutic demand. In this thesis Listeria monocytogenes was investigated as carrier for targeted bacterial cancer therapy. One part of the study focussed on modification of a functional bacterial mRNA delivery system. Genomic integration of T7 RNA polymerase driving mRNA production allowed reduction to an one-plasmid-system and thereby partially relieved the growth retardation exerted by mRNA delivery. Importantly the integration allowed metabolic attenuation of the mRNA delivery mutant potentially enabling in vivo applications. Further expansion of the bacterial RNA delivery system for transfer of shRNAs was examined. Bacterial mutants producing high amounts of RNA containing shRNA sequences were constructed, however a functional proof of gene silencing on delivery in eukaryotic cell lines was not achieved. The second part of this thesis focussed on increasing tumor colonization by Listeria monocytogenes in vivo. Coating bacteria with antibodies against receptors overexpressed on distinct tumor cell lines enabled specific bacterial internalization into these cells in vitro. Optimization of the bacterial antibody coating process resulted in an up to 104-fold increase of intracellular bacteria. Combination of this antibody-mediated targeting with the delivery of prodrug-converting enzymes showed a cytotoxic effect in cell lines treated with the corresponding prodrug. Since incubation in murine serum completely abrogated antibodymediated bacterial internalization the antibodies were covalently linked to the bacteria for application in xenografted tumor mice. Bacteria coated and crosslinked in this manner showed enhanced tumor targeting in a murine tumor model demonstrating antibodymediated bacterial tumor targeting in vivo. Independent of antibody-mediated tumor targeting the intrinsic tumor colonization of different Listeria monocytogenes mutants was examined. Listeria monocytogenes ΔaroA ΔinlGHE colonized murine melanoma xenografts highly efficient, reaching up to 108 CFU per gram of tumor mass 7 days post infection. Taken together the presented data shows highly promising aspects for potential bacterial application in future tumor therapies. Combination of the delivery systems with antibodymediated- and intrinsic bacterial tumor targeting might open novel dimensions utilizing Listeria monocytogenes as therapeutic vector in targeted tumor therapy.
iNKT cells are a population of T cells with unique characteristics. In contrast to most αβ T cells which recognize peptides presented by highly polymorphic MHC molecules, iNKT cells are reactive to glycolipids presented by CD1d, a non-polymorphic MHC-I like molecule. Moreover, whereas MHC-restricted αβ T cells bear highly variable receptors (TCRs) formed after somatic recombination of the V(D)J gene segments, the TCR of iNKT cells is formed by an invariant α chain, which always contains the same gene segments: AV14 and AJ18; and a β chain of limited BV gene usage: BV8S2, BV7 or BV2, in the mouse. This invariant α chain is the reason for which these cells are named “i” and the NK part of their name refers to the expression of receptors typical of natural killer (NK) cells. iNKT cells recognize glycolipids of endogenous and microbial origin. After activation they secrete large amounts of very different cytokines such as IFN-γ and IL-4 and thus influence immune responses and pathological conditions. One of the most potent iNKT cell agonists, recognized by the semi-invariant TCR, is the synthetic glycolipid α-Galactosylceramide (α-Gal). iNKT cells can be visualized using CD1d-multimeric complexes loaded with α-Gal and flow cytometry, since this reagent has enough avidity to stain these cells. Interestingly, mouse iNKT cells can be stained with human α-Gal-loaded CD1d oligomers and human iNKT cells can also be visualized with mouse α-Gal-loaded CD1d oligomers, indicating a high degree of conservation of the recognition of α-Gal presented by CD1d through evolution. Previous studies showed that rats have the genes necessary to build semi-invariant TCRs: They have a CD1d homologue; one or two BV8S2 homologues and interestingly, up to ten AV14 gene segments, which are highly conserved when compared to the mouse genes. Importantly, it has been shown at least for two of these AV14 gene segments that they can produce invariant TCRα chains which, when coexpressed with BV8-containing β chains, react to α-Gal presented by rat CD1d. Furthermore, ex vivo stimulation of primary splenocytes with α-Gal results in the secretion of IL-4 and IFN-γ. Surprisingly, rat semi-invariant TCRs do not recognize α-Gal presented by mouse CD1d and accordingly, mouse α-Gal-loaded CD1d tetramers failed to stain a discrete population of rat iNKT cells. Taking all together, despite that strong evidence suggested that iNKT cells are present in the rat, the direct identification of such population and the analysis of CD1d-restricted immune responses were still pending for this species. Hence the work presented in this doctoral thesis was aimed to identify iNKT cells, to analyze their phenotype and also to study the distribution and function of CD1d in the rat. For these purposes, we produced essential reagents which were still lacking such as rat specific anti-CD1d monoclonal antibodies and rat CD1d oligomers. Importantly, two of three anti-rat CD1d monoclonal antibodies (all of them generated in our laboratory before this thesis was initiated) also recognized mouse CD1d and therefore allowed a direct comparison of CD1d expression between rat and mouse. Whereas CD1d distribution in the hematopoietic system was found to be extremely similar between these two species; in non-lymphatic tissues important differences were observed. Interestingly, CD1d protein was detected at not yet described sites such as the rat exocrine pancreas and rat and mouse Paneth cells. These monoclonal antibodies did not only allowed the analysis of CD1d expression, but also the first demonstration of the function of rat CD1d as an antigen presenting molecule, since cytokine release in response to α-Gal was blocked when they were added to ex vivo cultures of rat primary cells. Staining of primary rat iNKT cells (possible now with the newly generated rat CD1d oligomers) revealed interesting similarities with human iNKT cells. First, we observed that rat iNKT cells are only a minority among all NKR-P1A/B positive T cells. Human iNKT cells constitute also a very small proportion of NKR-P1A (CD161) expressing T cells, whereas in mice inbred strains which express NKR-P1C (NK1.1), most of NKRP1C expressing T cells are iNKT cells. Second, the majority of rat iNKT cells are either CD4 or DN and only a small proportion expresses CD8β. These findings are similar to humans and different to mice which lack CD8+ iNKT cells. Third, analysis of various inbred rat strains demonstrated different iNKT cell frequencies which correlated with cytokine secretion after α-Gal stimulation of primary cells. In comparison to mice, iNKT cell numbers are markedly reduced in rats. In F344 rats, inbred rat strain which released the highest cytokine amounts after α-Gal stimulation, approximately 0.25% and 0.1% of total liver and spleen lymphocytes, respectively, are iNKT cells. In contrast, in LEW rats iNKT cells were practically absent and neither IL-4 nor IFN-γ were detected after stimulation of primary cells with α-Gal. Once more, these frequencies are very close to those observed in humans. Last, as reported for human peripheral blood cells, rat iNKT cells could be easily expanded in vitro by adding α-Gal to cultures of intrahepatic lymphocytes, whereas the expansion of mouse iNKT cells was not possible using the same protocol. The presence of a multimember AV14 gene segment family in the rat is an intriguing characteristic. These AV14 gene segments are extremely homologous except in the CDR2α region. Based on the amino acid sequence of this region they have been divided into two different types: Type I and II. A specific tissue distribution of the different types was proposed in the first study where the presence of several AV14 gene segments was described. We also analyzed the AV14 gene segment usage in F344 and LEW inbred rat strains. In F344 rats we found no preferential usage of either AV14 gene segment type in the spleen and the liver but type II AV14 gene segments appeared more frequently in the thymus. In contrast, LEW rats show a preferential usage of type I AV14 gene segments in all three compartments analyzed: Thymus, spleen and liver. Taken all together, the usage of newly generated reagents allowed to gain novel insights into CD1d expression in the rat and in the mouse and to directly identify rat iNKT cells for the first time. The phenotypic and functional analysis of rat iNKT cells revealed numerous similarities with human iNKT cells. These are of special interest, since rats serve to investigate several pathological conditions including models for autoimmune diseases. The possibility now to analyze iNKT cells and CD1d-restricted T cell responses in the rat might help to understand the pathogenesis of such diseases. In addition, the uncomplicated in vitro expansion and culture of rat iNKT cells should facilitate the analysis of the immunomoldulatory capacities of these cells.
In dieser Arbeit wurde das PVM-Mausmodell verwendet, um die Bedeutung der Typ I und Typ III Interferonantwort für die Pathogenese einer pneumoviralen Infektion zu analysieren. Hierzu wurden zunächst mit Hilfe der reversen Genetik rekombinante PVM-Mutanten hergestellt, bei denen die Gene für die NS-Proteine, welche vermutlich als Interferonantagonisten fungieren, deletiert sind. Die Charakterisierung der Replikationsfähigkeit der rPVM dNS-Mutanten erfolgte in vitro in Interferon-kompetenten und Interferon-inkompetenten Zelllinien. Ein zentraler Schritt innerhalb dieser Charakterisierung war die Untersuchung der Induktion von Interferonen in vivo und in vitro nach Infektion mit den rPVM dNSMutanten, wobei nachgewiesen wurde, dass die NS-Proteine von PVM als Interferonantagonisten fungieren. In allen Interferon-kompetenten Zellkulturen wurde eine Attenuierung von rPVM dNS1, rPVM dNS2 und rPVM dNS1dNS2 bezogen auf rPVM beobachtet. In allen Interferon-inkompetenten Zellkulturen konnte die Attenuierung der rPVM dNS-Mutanten nahezu vollständig revertiert werden. Nach Infektion mit den rPVM dNS-Mutanten wurde in verschiedenen Zelllinien eine Induktion von Typ I und Typ III Interferonen betrachtet, wobei Unterschiede in der Stärke der Interferon-Induktion nach Infektion mit den rPVM dNS-Mutanten vorhanden waren. Zusammenfassend war es möglich, die NS1- und NS2-Proteine von PVM in Analogie zu RSV eindeutig als Antagonisten der Interferonantwort zu identifizieren. Die Untersuchung der protektiven Rolle von Typ I und Typ III Interferonen für die Replikation und Pathogenität von PVM bildete den zweiten Teil dieser Arbeit. Hierzu wurde die Replikationsfähigkeit und Pathogenität der rPVM dNS-Mutanten in verschiedenen Interferon-defizienten Mausstämmen getestet. Die Untersuchungen ergaben eine protektive Rolle von Typ I und Typ III Interferonen bei einer Infektion mit PVM, wobei den Typ I Interferonen ein effektiverer Einfluss zugeordnet werden konnte. Ein Vergleich von Replikation und Virulenz zwischen den verschiedenen Typ I oder Typ III oder Typ I/Typ III Interferonrezeptor-defizienten Mausstämmen belegte eine erhöhte Suszeptibilität der Typ I/Typ III Interferonrezeptor-defizienten Mäuse gegenüber einer Infektion mit den rPVM dNS-Mutanten. Eine vollständige Aufhebung der Attenuierung wurde auch in den Typ I/Typ III Interferonrezeptor-defizienten Mäusen nicht erlangt. Eine anti-apoptotische Funktion der NS-Proteine zusätzlich zu ihrer Wirkungsweise als Interferonantagonisten wurde aufgrund der unvollständigen Revertierung der Pathogenität der rPVM dNS-Mutanten in Typ I/Typ III Interferonrezeptor-defizienten Mäusen vermutet. Der abschließende Teil dieser Dissertation befasste sich mit der Frage, welche Zellen bei einer natürlichen pulmonalen Infektion Interferone in vivo produzieren. In vitro wurde beobachtet, dass überraschenderweise nur sehr wenige virusinfizierte oder uninfizierte Zellen Typ I Interferone bilden. Der Nachweis darüber, welche Zellen während einer pulmonalen Infektion hauptsächlich Interferone in vivo produzieren, war aufgrund der fehlenden Eignung der kommerziell erhältlichen Interferon-Antikörper für intrazelluläre Gewebefärbungen nicht möglich. Dennoch gelang es abschließend durch eine neue Nachweismethode erstmals Zellen mit rezeptorgebundenen Interferon zu identifizieren, wobei es sich um ziliierte Epithelzellen, Alveolarmakrophagen und vermutlich Clarazellen sowie Typ I und Typ II Pneumozyten handelte.
Cooperation is beneficial for social groups and is exemplified in its most sophisticated form in social insects. In particular, eusocial Hymenoptera, like ants and honey bees, exhibit a level of cooperation only rarely matched by other animals. To assure effective defense of group members, foes need to be recognized reliably. Ants use low-volatile, colony-specific profiles of cuticular hydrocarbons (colony odor) to discriminate colony members (nestmates) from foreign workers (non-nestmates). For colony recognition, it is assumed that multi-component colony odors are compared to a neuronal template, located in a so far unidentified part of the nervous system, where a mismatch results in aggression. Alternatively, a sensory filter in the periphery of the nervous system has been suggested to act as a template, causing specific anosmia to nestmate colony odor due to sensory adaptation and effectively blocking perception of nestmates. Colony odors are not stable, but change over time due to environmental influences. To adjust for this, the recognition system has to be constantly updated (template reformation). In this thesis, I provide evidence that template reformation can be induced artificially, by modifying the sensory experience of carpenter ants (Camponotus floridanus; Chapter 1). The results of the experiments showed that template reformation is a relatively slow process taking several hours and this contradicts the adaptation-based sensory filter hypothesis. This finding is supported by first in-vivo measurements describing the neuronal processes underlying template reformation (Chapter 5). Neurophysiological measurements were impeded at the beginning of this study by the lack of adequate technical means to present colony odors. In a behavioral assay, I showed that tactile interaction is not necessary for colony recognition, although colony odors are of very low volatility (Chapter 2). I developed a novel stimulation technique (dummy-delivered stimulation) and tested its suitability for neurophysiological experiments (Chapter 3). My experiments showed that dummy-delivered stimulation is especially advantageous for presentation of low-volatile odors. Colony odor concentration in headspace was further increased by moderately heating the dummies, and this allowed me to measure neuronal correlates of colony odors in the peripheral and the central nervous system using electroantennography and calcium imaging, respectively (Chapter 4). Nestmate and non-nestmate colony odor elicited strong neuronal responses in olfactory receptor neurons of the antenna and in the functional units of the first olfactory neuropile of the ant brain, the glomeruli of the antennal lobe (AL). My results show that ants are not anosmic to nestmate colony odor and this clearly invalidates the previously suggested sensory filter hypothesis. Advanced two-photon microscopy allowed me to investigate the neuronal representation of colony odors in different neuroanatomical compartments of the AL (Chapter 5). Although neuronal activity was distributed inhomogeneously, I did not find exclusive representation restricted to a single AL compartment. This result indicates that information about colony odors is processed in parallel, using the computational power of the whole AL network. In the AL, the patterns of glomerular activity (spatial activity patterns) were variable, even in response to repeated stimulation with the same colony odor (Chapter 4&5). This finding is surprising, as earlier studies indicated that spatial activity patterns in the AL reflect how an odor is perceived by an animal (odor quality). Under natural conditions, multi-component odors constitute varying and fluctuating stimuli, and most probably animals are generally faced with the problem that these elicit variable neuronal responses. Two-photon microscopy revealed that variability was higher in response to nestmate than to non-nestmate colony odor (Chapter 5), possibly reflecting plasticity of the AL network, which allows template reformation. Due to their high variability, spatial activity patterns in response to different colony odors were not sufficiently distinct to allow attribution of odor qualities like ‘friend’ or ‘foe’. This finding challenges our current notion of how odor quality of complex, multi-component odors is coded. Additional neuronal parameters, e.g. precise timing of neuronal activity, are most likely necessary to allow discrimination. The lower variability of activity patterns elicited by non-nestmate compared to nestmate colony odor might facilitate recognition of non-nestmates at the next level of the olfactory pathway. My research efforts made the colony recognition system accessible for direct neurophysiological investigations. My results show that ants can perceive their own nestmates. The neuronal representation of colony odors is distributed across AL compartments, indicating parallel processing. Surprisingly, the spatial activity patterns in response to colony are highly variable, raising the question how odor quality is coded in this system. The experimental advance presented in this thesis will be useful to gain further insights into how social insects discriminate friends and foes. Furthermore, my work will be beneficial for the research field of insect olfaction as colony recognition in social insects is an excellent model system to study the coding of odor quality and long-term memory mechanisms underlying recognition of complex, multi-component odors.
Das Ziel der vorliegenden Arbeit war die Untersuchung der Reaktionen von Migränepatientinnen mit episodischer (EM) und häufiger Migräne (HM) auf verschiedene Aspekte des Triggerfaktors „Negativer Affekt“ wie Stress und negative Emotionen. Die Ergebnisse der beiden Gruppen wurden mit denen gesunder Kontrollpersonen verglichen (KG). Zur Ermittlung des Aufmerksamkeitsverhaltens gegenüber emotionalen Reizen wurden zwei Emotionale Stroop Tests (EST) durchgeführt. Erwartet wurde ein Aufmerksamkeitsbias der Patientinnen hinsichtlich negativer emotionaler Reize. Im EST 1 wurden allgemeine affektive Wörter der Valenzen positiv, neutral und negativ verwendet. Die Probandinnen sollten auf die Wortfarbe mit Tastendruck reagieren und den Wortinhalt ignorieren. Im EST 2 wurden emotionale Gesichtsausdrücke (ärgerlich, freundlich, neutral) als Reize verwendet. Dabei sollte die Rahmenfarbe der Bilder per Tastendruck bestimmt werden und der Inhalt ignoriert werden. Zur Auswertung wurden Emotionale Stroop Interferenzen (ESI) zum Vergleich Reaktionszeitdifferenzen negativ-neutral und negativ-positiv berechnet. Der erwartete Aufmerksamkeitsbias der HM für negative emotionale Reize wurde dabei nicht gefunden. Dafür zeigten im EST 2 die KG einen Aufmerksamkeitsbias für ärgerliche Gesichter. Ein signifikanter Gruppenunterschied in EST 2 mit sehr niedrigen, im Vergleich negativ-positiv sogar negativen ESI der HM ließ auf ein Vermeidungsverhalten dieser Gruppe ärgerlichen Gesichtern gegenüber schließen. Dieses wurde als Vermeidung negativer sozialer Reize interpretiert und zum gelernten, möglicherweise dysfunktionalen Vermeidungsverhalten von Migränepatienten potentiellen Triggersituationen gegenüber in Bezug gesetzt. Weiterhin wurden die Probandinnen mit dem „Paradigma der Öffentlichen Rede“ psychosozialem Stress ausgesetzt, indem sie vor einer Videokamera unter Beobachtung eine Rede halten sowie eine Kopfrechenaufgabe lösen sollten. Vorher und nachher wurden insgesamt vier Speichelproben zur Bestimmung des Stresshormons Kortisol genommen. Zudem wurden die Druckschmerzschwellen vor und nach dem Experimentalteil gemessen. Die erwartete Kortisolreaktion als Antwort auf die psychosoziale Stressaufgabe blieb aus. Ursache dafür kann die Stichprobenzusammensetzung mit 98% Frauen sein, deren Kortisolreaktion auf Stress durch hormonelle Schwankungen im Experiment nur unzuverlässig stimulierbar ist. Bei der Berechnung der Gesamtkortisolausschüttung über die Zeit zeigte sich im Gegensatz zu dem erwarteten erhöhten Kortisolspiegel der Migränepatientinnen ein linearer Abfall des Spiegels von KG, über EM zu HM, mit den niedrigsten Werten der HM. Diese Ergebnisse könnten auf Veränderungen der Hypophysen-Nebennieren (HHN)-Achse im Sinne eines Hypokortisolismus bei Migränepatientinnen widerspiegeln, der weiterer Klärung bedarf, z.B. durch die Bestimmung eines Kortisoltagesprofils bei Patientinnen. Eine veränderte Funktion der HHN-Achse könnte außerdem zu einer inadäquaten Reaktion auf Stresssituationen beitragen. Die bei Patientinnen ausbleibende Veränderung der Druckschmerzschwelle in Reaktion auf Stress lässt ebenfalls auf eine ungenügende Stressreaktion der Patientinnen schließen. Am Ende der Untersuchung, nach einer Entspannungsphase von 50 Minuten, wurde den Probandinnen Blut abgenommen, in dem die mRNA- und Proteinkonzentrationen ausgewählter pro- und antiinflammatorischer Zytokine bestimmt wurden. Die Analyse der Zytokinkonzentrationen mit Luminex ergab für die Proteindaten aufgrund zu geringer verwertbarer Daten kein interpretierbares Bild. Die mittels Real Time Quantitativer PCR erhaltenen mRNA-Konzentrationen spiegelten die Schmerzfreiheit der Patienten wieder, mit im Vergleich zu KG verringerten proinflammatorischen Zytokinen (TNF-alpha, IL-1beta, IL-2, IL-6) und dem ebenfalls verringerten antiinflammatorischen Zytokin IL-10, sowie dem deutlich erhöhten antiinflammatorischen IL-4. Die im Vergleich zur KG überregulierten Zytokine im schmerzfreien Intervall weisen auf veränderte Regulierungsmechanismen des Immunsystems für die Schmerzmediatoren Zytokine hin. Weitere Schmerzmediatoren könnten ebenfalls verändert sein, was weiterer Klärung in nachfolgenden Studien bedarf. Alles in allem konnten verschiedene Veränderungen in den psychologischen und endokrinen Reaktionen der Migränepatientinnen auf Bestandteile des Triggers „Negativer Affekt“ sowie in der Schmerzregulierung gefunden werden, wobei die Veränderungen bei Patientinnen mit Häufiger Migräne stärker auftraten. Dies weist auf eine mögliche Rolle der einzelnen untersuchten Komponenten bei der Migränechronifizierung hin, was in weiteren Studien vertiefend untersucht werden sollte.
The saprophytic filamentous fungus Aspergillus fumigatus has been gaining importance as an opportunistic human pathogen over the past decades. Advances in modern medicine have created a growing group of patients susceptible to infection with A. fumigatus, often contracting potentially deadly invasive aspergillosis. The virulence of this pathogen appears to be a multifactorial trait, a combination of physiological characteristics that enables the fungus to infect immunocompromised humans. This work concentrates on the nitrogen metabolism of A. fumigatus, which is essential for meeting the nutritional needs inside the human host. Using DNA microarrays, the transcriptional response during growth on three different secondary nitrogen sources was examined, which revealed the metabolic versatility of A. fumigatus, especially when challenged with proteins as the sole source of nitrogen. In-depth transcriptional profiling of the eight-member oligopeptide transporter (OPT) gene family underlined the importance of oligopeptide transport for growth on complex nitrogen sources like BSA or collagen. Heterologous expression of the opt genes in Saccharomyces cerevisiae showed their functionality as oligopeptide transporters, and characterized their substrate specificity. Using a Cre/loxP based genetic tool, a complete deletion of all opt genes in A. fumigatus was achieved. The resultant strain exhibited diminished growth on medium where the oligopeptide GPGG was the sole nitrogen source, but did not show any other in vitro phenotype. The opt deletion strain was not attenuated in virulence in a murine model of pulmonary aspergillosis, suggesting that the OPT gene family is not necessary for successful infection. The connection of oligopeptide transport and extracellular proteolytic activity was investigated by deleting the genes encoding Dpp4 and Dpp5, two dipeptidyl peptidases, or PrtT, the transcriptional regulator of major secreted proteases, in the complete opt deletion background. In contrast to the deletion of dpp4 and dpp5, which did not result in any additional phenotype, the absence of prtT led to a drastic growth defect on porcine lung agar. This suggests a synergistic action of extracellular proteolytic digest of proteins and transport of oligopeptide degradation products into the cell. Finally, this work established the bacterial β-Rec/six site-specific recombination system as a novel genetic tool for targeted gene deletion in A. fumigatus.
Reactive oxygen species (ROS) are continuously generated in cells and are involved in physiological processes including signal transduction but also their damaging effects on biological molecules have been well described. A number of reports in the literature implicate excessive oxidative stress and/or inadequate antioxidant defense in the pathogenesis of cancer, atherosclerosis, chronic and age related disorders. Several studies have indicated that activation of the renin-angiotensin-aldosterone-system can lead to the formation of ROS. Epidemiological studies have revealed higher renal cell cancer incidences and also higher cancer mortalities in hypertensive individuals. Recently, our group has shown that perfusion of the isolated mouse kidney with Ang II or treatment of several cell lines with Ang II leads to formation of DNA damage and oxidative base modifications. Here, we tried to scrutinize the pathway involved in genotoxicity of Ang II. We confirmed the genotoxicity of Ang II in two kidney cell lines of human origin. Ang II treatment led to the production of superoxide anions which we could hinder when we used the membrane permeable superoxide dismutase (SOD) mimetic TEMPOL. One of the enzymes which is activated in the cells after Ang II treatment and is able to produce ROS is NADPH oxidase. We demonstrated the activation of NADPH oxidase in response to Ang II by upregulation of its p47 subunit using RT-PCR. Also, pPhosphorylation of p47 subunit of NADPH oxidase after Ang II treatment was enhanced. Using two inhibitors we showed that NADPH oxidase inhibition completely prevents DNA damage by Ang II treatment. To differentiate between Nox2 and Nox4 isoforms of NADPH oxidase subunits in the genotoxicity of Ang II, we performed siRNA inhibition and found a role only for Nox4, while Nox2 was not involved. Next, we investigated PKC as a potential activator of NADPH oxidase. We showed that PKC becomes phosphorylated after Ang II treatment and also that inhibition of PKC hinders Ang II from damaging the cells. Our results from using several inhibitors of different parts of the pathway revealed that PKC activation in this pathway is dependent on the action of PLC on membrane phospholipids and production of IP3. IP3 binds to its receptor at endoplasmic reticulum (ER), opening a channel which allows calcium efflux into the cytoplasm. In this manner, both ER calcium stores and extracellular calcium cooperate so that Ang II can exert its genotoxic effect. PLC is activated by AT1R stimulation. We could also show that the genotoxicity of Ang II is mediated via AT1R signaling using the AT1R antagonist candesartan. In conclusion, here we have shown that Ang II is able to damage genomic damage in cell lines of kidney origin. The observed damage is associated with production of ROS. A decrease in Ang II-induced DNA damage was observed after inhibition of G-proteins, PLC, PKC and NADPH oxidase and interfering with intra- as well as extracellular calcium signaling. This leads to the following preliminary model of signaling in Ang II-induced DNA damage: binding of Ang II to the AT1 receptor activates PLC via stimulation of G-proteins, resulting in the activation of PKC in a calcium dependent manner which in turn, activates NADPH oxidase. NADPH oxidase with involvement of its Nox4 subunit then produces reactive oxygen species which cause DNA damage. Dopamine content and metabolism in the peripheral lymphocytes of PD patients are influenced by L-Dopa administration. The PD patients receiving a high dose of L-Dopa show a significantly higher content of dopamine in their lymphocytes compared to PD patients who received a low dose of L-Dopa or the healthy control. Central to many of the processes involved in oxidative stress and oxidative damage in PD are the actions of monoamine oxidase (MAO), the enzyme which is responsible for the enzymatic oxidation of dopamine which leadsing to production of H2O2 as a by-product. We investigated whether dopamine oxidation can cause genotoxicity in lymphocytes of PD patents who were under high dose L-Dopa therapy and afterward questioned the occurrence of DNA damage after dopamine treatment in vitro and tried to reveal the mechanism by which dopamine exerts its genotoxic effect. The frequency of micronuclei in peripheral blood lymphocytes of the PD patients was not elevated compared to healthy age-matched individuals, although the formation of micronuclei revealed a positive correlation with the daily dose of L-Dopa administration in patients who received L-Dopa therapy together with dopamine receptor agonists. In vitro, we describe an induction of genomic damage detected as micronucleus formation by low micromolar concentrations in cell lines with of different tissue origins. The genotoxic effect of dopamine was reduced by addition of the antioxidants TEMPOL and dimethylthiourea which proved the involvement of ROS production in dopamine-induced DNA damage. To determine whether oxidation of dopamine by MAO is relevant in its genotoxicity, we inhibited MAO with two inhibitors, trans-2-phenylcyclopropylamine hydrochloride (PCPA) and Ro 16-6491 which both reduced the formation of micronuclei in PC-12 cells. We also studied the role of the dopamine transporter (DAT) and dopamine type 2 receptor (D2R) signaling in the genotoxicity of dopamine. Inhibitors of the DAT, GBR-12909 and nomifensine, hindered dopamine-induced genotoxicity. These results were confirmed by treatment of MDCK and MDCK-DAT cells, the latter containing the human DAT gene, with dopamine. Only MDCK-DAT cells showed elevated chromosomal damage and dopamine uptake. Although stimulation of D2R with quinpirole in the absence of dopamine did not induce genotoxicity in PC-12 cells, interference with D2R signaling using D2R antagonist and inhibition of G-proteins, phosphoinositide 3 kinase and extracellular signal-regulated kinases reduced dopamine-induced genotoxicity and affected the ability of DAT to take up dopamine. Furthermore, the D2R antagonist sulpiride inhibited the dopamine-induced migration of DAT from cytosol to cell membrane. Overall, the neurotransmitter dopamine causes DNA damage and oxidative stress in vitro. There are also indications that high dose L-Dopa therapy might lead to oxidative stress. Dopamine exerts its genotoxicity in vitro upon transport into the cells and oxidization oxidation by MAO. Transport of dopamine by DAT has the central role in this process. D2R signaling is involved in the genotoxicity of dopamine by affecting activation and cell surface expression of DAT and hence modulating dopamine uptake. We provided evidences for receptor-mediated genotoxicity of two compounds with different mechanism of actions. The involvement of these receptors in many human complications urges more investigations to reveal whether abnormalities in the endogenous compounds-mediated signaling can play a role in the initiation of new conditions like carcinogenesis.
The genus Borrelia belongs to the Spirochaetes phylum which is far related to Gram negative bacteria. This phylum possesses a characteristic long helically coiled shape with lengths that vary from 5 to 250 μm. Other pathogens as Treponema and Leptospira which cause syphilis and leptospirosis, also belong to the Spirochaetes. Borrelia itself is the causative agent of two human diseases, the Lyme disease and relapsing fever. Borreliae are pathogenic bacteria which cycle between their arthropod vector, in most cases a tick, and a mammal host, very often small rodents. This complex life cycle requires an extraordinary protein up- and down-regulation in order to survive in such different organisms and avoid their immunologic systems. Lyme disease is a multisystemic disease that can affect different organs like skin, joints and nervous system. A red rash with concentric rings, called erythema migrans is a distinctive manifestation that allows clinical diagnosis. It appears after the bite of an infected tick and spreads out to diameters that can reach 15 cm. Relapsing fever is characterized by sudden recurrent fever peaks accompanied with chills, headache, muscle and joint pain and nausea. Both diseases are easily treated with antibiotics in early infection stages. Borrelia species possess a small genome. Many of their genes are related with virulence and the adaptation to the different hosts. The absence of genes in Borrelia involved in the biosynthesis of amino acids, fatty acids or nucleotide is very remarkable. This metabolic deficiency makes Borrelia species dependent on substances produced by the host. The first step in nutrient uptake is accomplished by porins. Bacterial porins are water-filled channels that facilitate the transport of essential molecules through the outer membrane. Four porins have been described in Borrelia up to this point. P66, P13 and Oms28 have been found in Borrelia burgdorferi while Oms38 was discovered in relapsing fever spirochetes. P66 is a singular porin with an extremely high single channel conductance of 11 nS. P13 is a small protein with an α-helical secondary structure which does not fit into the general porin model. The function of Oms28 as a porin has been questioned recently due to its periplasmic membrane-associated location. Finally, Oms38 is a specific porin for dicarboxilates with homologues in Lyme disease species. The aim of this thesis was to broaden the knowledge of the P66 and P13 porins described in the genus Borrelia. Both differ in structure and size from the general Gram negative porin model and could be highly involved in specific tasks in the genus Borrelia. In the first project of this thesis, the presence and pore forming capacity of P66 was studied in several Borrelia species including members of the relapsing fever group. P66 is the best studied porin in Borrelia with a dual function as porin and adhesin. This knowledge is restricted to B. burgdorferi and little or nothing is known about homologues in other Borrelia species. Therefore, three Lyme disease and three relapsing fever species were chosen as representative agents of the genus and the pore forming activity of their P66 homologues was studied. Five out of the six homologues exhibited a similar single channel conductance in a range from 9 to 11 nS. All of them showed no selectivity for cations or anions, and they were voltage dependent starting at different voltages from 30 to 70 mV. Only in the case of the B. hermsii homologue no pore forming activity could be established. It remains unclear if the lack of activity was due to an evolutionary loss of its porin function or to a higher sensibility to the detergents used for purification. In another project, the controversial P66 pore diameter of B. burgdorferi was analyzed with an empirical method. In a former study, the diameter of the P66 channel was estimated to be 2.6 nm based on theoretical considerations. This diameter is rather large and could impair the outer membrane protective function. Different non-electrolytes were used to study the P66 pore diameter indicating a 1.8 nm entrance diameter and a 0.8 nm inner constriction. In addition, the blockage of the channel with some of those non-electrolytes disclosed an oligomeric organization formed by approximately eight independent channels. Such a structure has not been observed so far in any other living organism and could be exclusive of Borrelia or spirochetes. The third project of this thesis deal with the recombinant production of a B. burgdorferi protein with immunogenic potential. This protein might be used to develop new diagnosis tests and therapeutic treatments. P13 is an outer membrane protein present in LD and RF species and it does not have any other known bacterial homologue. These facts make of P13 a good candidate to be used as a therapeutic target. For such purpose, P13 was cloned in two organisms. First, in Escherichia coli were two different constructs were designed to establish the role of a periplasmic cleaved C-terminus. Second, in a virus based vector delivered by Agrobacterium tumefaciens into tobacco plant cells. The vector replicates inside the plant cells spreading the infection to adjacent cells and at the same time producing the recombinant protein. This second expression method should enable the production of large amounts of the recombinant protein reducing time and costs. The last project of this thesis looked into the outer membrane complexome of B. burgdorferi focusing on the P13 and P66 porin complexes. Blue Native Page and second dimension SDS Page were the technique chosen for this purpose. P66 could be shown to be the only protein involved in the formation of the 11 nS pore which complex is probably formed by eight monomers. It was also possible to divide this complex in two halves with approximately half the molecular weight and a conductance of 5.5 nS. In the case of the P13 complex, a possible association with the lipoprotein OspC was revealed. The gel extraction of the P13 complex and its test with the Back Lipid Bilayer assay exhibited a 0.6 nS activity. This is in high contrast with the 3.5 nS activity previously described for this protein. To sum up, P66 is a porin present in many Borrelia species including not only LD but also RF species and which homologues show similar biophysical properties. The diameter of this pore is smaller than previously thought and it has molecular weight sieving properties. In the case of P13, its recombinant procurement will allow the use of P13 as a diagnostic and therapeutic target. The possible association with OspC could facilitate to unravel in future experiments the function of this intriguing protein.
Semaphorin receptors in the immunological synapse: regulation and measles virus-driven modulation
(2010)
Measles virus (MV) infection causes approximately 164,000 deaths per year worldwide (WHO, 2008). The main cause of death is MV-induced immunosuppression but the underlying mechanisms are not fully understood. It has been suggested that MV renders T cells dysfunctional by disrupting the integrity of actin dynamics while MV infection of dendritic cells results in their inability to sustain T cell activation. During neuronal development, semaphorins (SEMAs), especially SEMA3A, induce a collapse of growing dendrites via the binding to plexin-A1 (plexA1) and its coreceptor neuropilin-1 (NP-1). The collapse results from a disruption of actin dynamics. In this study, the roles of these three molecules were investigated in human immune cells and their possible role in MV induced immunosuppression. The present data have shown that plexA1 is an important component of human immunological synapse (IS). It translocated transiently to the surface of T cells after CD3/28 ligation and accumulated at the stimulatory interface between T cells and DCs (or CD3/28 coated beads). When plexA1 expression was inhibited (RNAi) or its function was disrupted (exogenous blocking or dominant negative expression), T cell expansion was reduced. Upon MV exposure, translocation of plexA1 and NP-1, another important component of IS, towards the stimulatory interface in T cells was abrogated. Moreover, MV infection interfered with plexA1/NP-1 turnover in maturing DCs and promoted early and substantial release of SEMA3A from these cells, particularly in the presence of allogenic T cells. As revealed by scanning electron microscopy, the release of SEMA3A caused a transient loss of actin-based protrusions on T cells. SEMA3A affected chemotactic migration of T cells and DCs, and reduced formation of allogenic DC/T cell conjugates. In conclusion, MV targeted SEMA receptor function both by disrupting their recruitment to the IS and by promoting a premature release of their repulsive ligand, SEMA3A. Both of which could contribute to MV-induced immunosuppression.
Stem cells with the particular potential to self renew and to differentiate into multiple cell lineages are fascinating cell types for basic and applied research. Pluripotent embryonic stem (ES) cells are derived from the inner cell mass (ICM) of preimplantation embryos. Upon differentiation ES cells can give rise to cells of ecto-, meso- and endoderm including germ cells. In contrast, multipotent adult stem cells are more restricted in their differentiation outcomes,they differentiate into cells of their tissue of origin. For example, hematopoietic stem cells (HSCs) that reside in hemogenic tissues such as the bone marrow (BM) differentiate into hemato-/lymphoid cell lineages. Upon differentiation of stem cells not the genome, but the epigenetic regulation changes. Differentiation-associated epigenetic changes generate cell types with distinct phenotypes and functions. For stem cell-based therapies it is important to deeper understand the relation between epigenome and cellular function. In the scope of this thesis I aimed to analyze cultures of differentiating stem cells with respect to gene expression, chromatin regulation and differentiation potential. For the analysis of global histone modification levels, which represent one mechanism for epigenetic regulation, fow cytometric protocols were established that allow single cell measurements. By applying this methodology decreased histone acetylation levels were shown in differentiated ES cell populations. In contrast, comparable histone acetylation levels were observed in differentiated and undifferentiated BM cells. In addition, I investigated effects of the histone deacetylase (HDAC) inhibitor trichostatin A (TSA) on murine BM cells, comprising also HSCs. Upon TSA treatment the frequency of cells with in vitro and in vivo hematopoietic activity was increased, while lineage committed cells underwent apoptosis. Next, the loss of pluripotency was assessed in differentiating ES cell cultures. Using short-term in vitro differentiation protocols marker-based analyses and functional assays were performed.Functionally pluripotency was diminished after 2 days of differentiation as assessed by colony formation, embryoid body (EB) formation and cardiomyogenic differentiation approaches. In contrast, pluripotency marker expression was reduced at later time points. Further, the application of distinct differentiation systems (aggregation EB, clonal EB or monolayer (ML) culture) had an impact on the progression and homogeneity of differentiation cultures. To further study the end of pluripotency, differentiated ES cells were placed under ES cell culture conditions. The data suggest that 3 days differentiated ES cells had passed a point of no return and failed to regain Oct4-eGFP expression and that HDAC inhibitor treatment selectively killed differentiated ES cells. Finally, I aimed to study the effect of EED - a core subunit of the histone methylating Polycomb repressive complex 2 (PRC2) - on ES cell chromatin and function. ES cells lacking EED showed loss of histone H3 lysine 27 trimethylation (H3K27me3) accompanied by increased histone acetylation and reduced H3K9me3 levels. Despite typical ES cell morphology and pluripotency marker expression, EED knockout (KO) ES cells exhibited altered nuclear heterochromatin organization, delayed chromatin mobility and a failure in proper differentiation. Conclusively, my data provide insights into the epigenetic regulation of stem cells. Particularly, the results suggest that HDAC inhibitor treatment was detrimental for differentiated BM as well as for differentiated ES cells and that ES cells after 3 days of differentiation had lost pluripotency. Further, the data demonstrate that EED KO ES cells self renewed, exhibited morphology and pluripotency marker expression similar to wild type ES cells, but failed to differentiate. This indicates an important role of EED not only for undifferentiated but also for differentiating ES cells.
Malaria stellt mit einer Mortalität von über einer Million Menschen pro Jahr die bedeutsamste Tropenkrankheit für den Menschen dar. Wachsende Resistenzen der Malariaerreger gegenüber den verfügbaren Medikamenten erhöhen mehr denn je den Druck, neue Therapiemöglichkeiten sowie einen Impfstoff gegen diese Krankheit zu entwickeln. Eine Unterbrechung des sexuellen Fortpflanzungszyklus im Laufe der Transmission von Mensch zu Stechmücke würde zu einem Verbreitungsstopp des Erregers führen. Sowohl die Identifizierung von molekularen Wechselwirkungen als auch die Erforschung von an Fertilisationsereignissen beteiligten Prozessen sind wichtige Schritte, um die Sexualphase des Erregers aufzuklären und neue Angriffspunkte für Medikamente oder Vakzine zu entwickeln. Dem Genom von P. falciparum konnten 92 putative Proteasen zugeordnet werden, von denen nur ein geringer Bruchteil charakterisiert worden ist. Unter Anwendung von Protease-Inhibitoren konnte in dieser Arbeit gezeigt werden, dass die Exflagellation der männlichen Gameten die Beteiligung von Proteasen verschiedener Kategorien benötigt. Die Ergebnisse belegten, dass die Aktivität von zwei oder mehr Serinproteasen, von Falcipain-ähnlichen Cysteinproteasen, von nicht-Thermolysin-ähnlichen Zink-Metalloproteasen und von Aspartatproteasen für den erfolgreichen Abschluss der männlichen Gametogenese eine wichtige Voraussetzung ist. Die Lokalisation des Cysteinproteasen- und Falcipain-hemmenden Inhibitors bADA konnte erstmals im Zytosol von Sexualstadien nachgewiesen werden. In dieser Arbeit wurden zusätzlich die Proteasen Calpain, DPAP2, GPI8, Metacaspase 2, Plasmepsin 6 und PfSub3 näher untersucht. RT-PCR-Analysen konnten die Transkription der sechs ausgesuchten Proteasen in gemischten asexuellen Parasiten sowie zum Großteil in Gametozyten, Gameten und Zygoten belegen. Die Transformation von asexuellen Parasiten mit entsprechenden knockout-Konstrukten deckte für Metacaspase 2 und PfSub3 auf, dass sie im asexuellen Vermehrungszyklus nicht essentiell und die entsprechenden Genloci für Rekombinationsereignisse zugänglich sind. Die Ergebnisse der übrigen Transformationen deuteten darauf hin, dass Calpain essentiell im asexuellen Vermehrungszyklus und dass der Genlocus von Plasmepsin 6 für Rekombinationsereignisse unzugänglich ist. Proteinexpressionsstudien anhand von Western-Blot-Analysen und Immunfluoreszenzstudien für PfSub3 konnten Hinweise darauf liefern, dass diese Serinprotease in asexuellen Parasiten, nicht-aktivierten sowie aktivierten Sexualstadien exprimiert wird. Aufgrund der in dieser Arbeit generierten Ergebnisse konnten im Laufe der Gametogenese auftretende Gametenfilamente morphologisch beschrieben sowie Hinweise auf ihre mögliche Funktion erlangt werden. Durch die Anwendung von Immunfluoreszenzstudien, rasterelektronenmikroskopischen Aufnahmen sowie die Analyse lebender Gameten konnte gezeigt werden, dass die bis zu 180 µm langen Filamente am Ende geschlossen sind und einen Durchmesser von ca. 200 nm aufweisen. Die tubulären Zellausläufer konnten weiterhin als verzweigte sowie nicht-verzweigte Ausläufer der parasitären Plasmamembran dargestellt werden, die mit Zytoplasma gefüllt sind. Es konnte belegt werden, dass die Aktin-assoziierten Filamente in periodischen Abständen von beulenartigen Auswölbungen unterbrochen werden und dass sie in rasterelektronenmikroskopischen Analysen ein perlschnurartiges Erscheinungsbild aufweisen. Weiterhin wurde dokumentiert, dass die Zellausläufer mit typischen sexualstadienspezifischen Proteinen wie Pfs25, Pfs230, Pfs48/45 und PfCCp4 assoziiert vorliegen, wobei das Fehlen einzelner dieser Proteine jedoch nicht das Ausbilden der Gametenfilamente verhinderte. Als typisches Charakteristikum der Filamente konnte ihre Eigenschaft beschrieben werden, mehrere Makrogameten und zum Teil Gametozyten in einem Zellkluster miteinander netzartig zu verbinden, wobei bis zu neun Filamente von einem Makrogameten ausgehend beobachtet werden konnten. Die Gametenfilamente zeigten ebenfalls die Fähigkeit, an umliegende nicht-infizierte Erythrozyten sowie mit asexuellen Parasiten infizierte Erythrozyten zu adhärieren. Die Filamente waren bereits fünf Minuten nach der Aktivierung der Gametozyten und im Laufe der Gametogenese bei 33 bis 73 % der Zellen nachweisbar. Die Gametenfilamente blieben bis zu 12 Stunden nach Aktivierung der Gametozyten mit der Zelloberfläche verbunden. Der aktive Einzug eines Zellfilaments sowie die Bildung der Gametenfilamente im Mitteldarm der Stechmücke konnte ebenfalls demonstriert werden. Die in dieser Arbeit dargestellten Ergebnisse lieferten unter anderem den Grundbaustein einer formulierten Funktionshypothese für diese Gametenfilamente. Es wird angenommen, dass die Filamente aufgrund ihrer adhäsiven Eigenschaften im Laufe der Befruchtung von Plasmodium im Mitteldarm der Stechmücke auftreten. Möglicherweise bedienen sich vitale Gameten dieser Strukturen, um andere Sexualstadien zu finden und sie zu verbinden.
ß-Arrestin/Rezeptor-Interaktionen - Ein endogenes "Werkzeug" ligandenspezifischer Signaltransduktion
(2010)
Die Bedeutung der β-Arrestine als multifunktionelle Adapterproteine GPCR-vermittelter Signaltransduktion hat in den letzten Jahren immer mehr zugenommen. In der vorliegenden Arbeit lag der Schwerpunkt auf der Untersuchung der molekularen Basis und der Ligandenabhängigkeit sowohl der β-Arrestin/Rezeptor-Interaktion als auch β-Arrestin- (un-)abhängiger Signaltransduktionsmechanismen. Im ersten Teil wurde der Einfluß potentieller Phosphorylierungsstellen im C-Terminus des β2AR bzw. im C-Terminus und der TM3 des P2Y1R auf die agonisteninduzierte β-Arrestin/Rezeptor-Interaktion, Internalisierung und Desensibilisierung untersucht. Durch Mutationsanalysen konnten Ser 352/Thr 358 im distalen C-Terminus des P2Y1R als Schlüsselstellen der β-Arrestin-Translokation und Internalisierung identifiziert werden, während ein oder mehrere Phosphorylierungsstellen im proximalen P2Y1R C-Terminus die molekulare Grundlage der Rezeptordesensibilisierung darstellen. Darüber hinaus machte die Anwendung verschiedener PKC- oder CaMK-Inhibitoren sowie der Einsatz des PKC-Aktivators PMA deutlich, dass die P2Y1R-Desensibilisierung und β-Arrestin-Translokation durch unterschiedliche Kinasen kontrolliert werden. Zudem konnte mit Hilfe der FRET-Technik gezeigt werden, dass die Phosphorylierungsstellen zwischen den Positionen 355 und 364 im proximalen β2AR C-Terminus essentielle Bereiche der β-Arrestin-Translokation darstellen. Im zweiten Teil der vorliegenden Arbeit wurden Agonisten am β2-adrenergen Rezeptor bzw. dem P2Y2R auf ihre Fähigkeit hin untersucht verschiedene mit dem jeweiligen Rezeptor verknüpfte G-Protein- bzw. β-Arrestin-Funktionen in unterschiedlichem Ausmaß zu aktivieren („biased agonism“). Da eine solche ligandenselektive Aktivierung rezeptorvermittelter Signalwege bis dato nur mit synthetischen Liganden detailliert untersucht wurde, galt das besondere Interesse der Analyse der durch die endogenen Substanzen induzierten Signalmuster. Die Betrachtung der Noradrenalin- bzw. Adrenalin-induzierten β-Arrestin/Rezeptor-Interaktion, β-Arrestin2-Translokation, Rezeptorinternalisierung, G-Protein-Aktivierung sowie cAMP-Produktion am β2AR machte deutlich, dass es sich beim Phänomen des „biased agonism“ um einen endogenen Mechanismus handelt. Darüber hinaus konnte gezeigt werden, dass auch zur Tokolyse eingesetzte β2AR-Agonisten spezifische Signalmuster induzieren. Die Beobachtung, dass UTP und ATP sowohl unterschiedliche β-Arrestin1/2-Translokationsals auch ERK-Aktivierungsmuster am P2Y2R induzieren bestärkte das Konzept des „biased agonism“ als endogenes Phänomen. Das ligandenabhängige β-Arrestin-Translokationsverhalten des P2Y2R ließ zudem die agonistenbedingte Zuteilung des Rezeptors zu den „Klasse A“ oder „Klasse B“ Rezeptoren zu. Die detaillierte Untersuchung agonisteninduzierter Rezeptor/Effektor-Interaktionen und Signalmuster dürfte helfen die Anwendung klinisch relevanter Substanzen zu optimieren.
This thesis is divided into three parts with the main goal allocating novel antimicrobial compounds that could be used as future antibiotics. The first part aimed to evaluate the potential of plant suspension cultures for the production of antimicrobial proteins. The extracellular, intracellular and cell wall bound fractions of seven heterotrophic and photomixotrophic plant cell suspension cultures treated with nine different elicitors were tested for the elicitor dependent production of antimicrobial proteins. Bioactivities were tested against a selected panel of human isolates including Gram-positive and Gram-negative bacteria as well as fungi using the disc diffusion assay. The intracellular fractions of elicited cell cultures were more active than extracellular fractions while the cell wall bound fractions showed lowest activities. Among the 21 fractions tested, the intracellular fraction of Lavendula angustifolia elicited with DC3000 was most active against Candida maltosa. The second most active fraction was the intracellular fraction of Arabidopsis thaliana elicited with salicylic acid which was moreover active against all test strains. The antimicrobial activity of elicited Arabidopsis thaliana cell cultures was tested by bioautography to locate the antimicrobial proteins in the crude extract. The intracellular fraction of photomixotrophic Arabidopsis thaliana cells elicited with salicylic acid was selected for further gel filtration chromatography on S-200 column leading to the purification of one 19 kDa antimicrobially active protein, designated, AtAMP. Our findings suggest that elicited plant cell cultures may present a new promising alternative source of antimicrobial proteins. The second part comprises the isolation of actinomycetes associated with marine sponges and testing the bioactivities of new species for further investigations. Actinobacterial communities of eleven taxonomically different sponges that had been collected from offshore Ras Mohamed (Egypt) and from Rovinj (Croatia) were investigated by a culture-based approach using different standard media for isolation of actinomycetes and media enriched with aqueous sponge extract to target rare and new actinomycete species. Phylogenetic characterization of 52 representative isolates out of 90 based on almost complete sequences of genes encoding 16S rRNA supported their assignment to 18 different actinomycete genera. Altogether 14 putatively new species were identified based on sequence similarity values below 98.2% to other strains in the NCBI database. The use of M1 agar amended with aqueous sponge extract yielded a putative new genus related to Rubrobacter which highlighting the need for innovative cultivation protocols. Biological activity testing showed that five isolates were active against Gram-positives only, one isolate was active against Candida albicans only and one isolate showed activity against both groups of pathogens. Moreover, the antiparasistic activity was documented for four isolates. These results showed a high diversity of actinomycetes associated with marine sponges as well as highlighted their potential to produce anti-infective agents. The third part of the thesis focused on the isolation and structure elucidation of new bioactive compounds. Streptomyces strain RV15 recovered from sponge Dysidea tupha, was selected for further chemical analysis by virtue of the fact that it exhibited the greatest antimicrobial potential against Staphylococcus aureus as well as Candida albicans among the all tested strains. Moreover, members of the genus Streptomyces are well known as prolific producers of interesting pharmacologically active metabolites. Chemical analysis of the methanolic crude extract using different chromatographic tools yielded four new compounds. The structures of the new compounds were spectroscopically elucidated to be four new cyclic peptides, namely, cyclodysidins A-D. Their bioactivity was tested against different proteases, bacteria and Candida as well as tumor cell lines. The compounds did not show any significant activities at this point.
Das ANP/GC-A-System spielt durch die Produktion des sekundären Botenstoffs cGMP eine wichtige Rolle bei der Regulation des Blutdruckes und des Blutvolumens. Bei Patienten mit Herzhypertrophie oder Herzinsuffizienz sind die ANP-Plasmakonzentrationen erhöht, aber die GC-A-vermittelten Effekte stark reduziert, was auf einen Defekt des Signalsystems hinweist. Studien an metabolisch markierten GC-A-überexprimierenden HEK 293-Zellen zeigten, dass der GC-A-Rezeptor im basalen Zustand stark phosphoryliert und die homologe bzw. heterologe Desensitisierung wahrscheinlich mit einer Dephosphorylierung verbunden ist. Die Desensitisierung stellt einen Mechanismus dar, der in vivo zu einem Funktionsverlust des Rezeptors beitragen könnte. Im Rahmen dieser Arbeit konnten mittels Massenspektrometrie sieben Phosphorylierungsstellen in der Kinasehomologen Domäne aus FLAG-GC-A exprimierenden HEK 293-Zellen detektiert werden: Ser487, Ser497, Thr500, Ser502, Ser506, Ser510 und Thr513. Die massenspektrometrische relative Quantifizierung basierend auf der Multiple-Reaction-Monitoring (MRM)-Methode zeigte bei ANP-induzierter, homologer Desensitisierung eine Dephosphorylierung der Phosphorylierungsstellen Ser497, Thr500, Ser502, Ser506, Ser510 und Thr513, was mit bereits publizierten Daten übereinstimmt, und einen starken Anstieg der Phosphorylierung an Ser487. Nach Inkubation mit Angiotensin II, welches eine heterologe Desensitisierung hervorruft, wurde eine Reduzierung aller Phosphorylierungen verzeichnet, die zudem stärker ausgeprägt war als bei der ANP-abhängigen Desensitisierung. Die Funktion der neu identifizierten Phosphorylierung an Ser487 wurde mittels Mutagenese analysiert. Die Substitution des Serins durch Alanin, welche den unphosphorylierten Zustand nachstellt, resultierte in einer Rezeptoraktivität und desensitisierung vergleichbar zum GC-A Wildtyp-Rezeptor. Wurde hingegen Serin gegen Glutamat getauscht, um den phosphorylierten Zustand zu imitieren, konnte der Rezeptor weder aktiviert noch desensitisiert werden. Diese Ergebnisse bestätigen vorherige Studien, dass die GC-A-Rezeptorantwort auf ANP durch die Phosphorylierungen reguliert wird. Allerdings scheint bei der homologen Desensitisierung die Phosphorylierung an der Position Ser487 eine Rolle zu spielen, da sie die Aktivität des Rezeptors inhibiert. Die Identifizierung und Charakterisierung dieser Phosphorylierungsstelle trägt zum Verständnis des Mechanismus der homologen Desensitierung bei. Zusätzlich konnten einige der beschriebenen Phosphorylierungen in Zellsystemen detektiert werden, die die GC-A endogen exprimieren. Dadurch sind unter physiologischen Bedingungen Analysen der Mechanismen möglich, die bei der Aktivierung und Deaktivierung der GC-A involviert sind und somit wichtige pathophysiologische Konsequenzen haben können.
Characterization of tolerogenic rat bone marrow-derived dendritic cells and regulatory T cells
(2010)
Tolerogenic dendritic cells (DC) and regulatory T (Treg) cells are able to prevent destructive immune responses. There is reason to hope that it may soon be possible to use DC and Treg cells to suppress immune responses antigen-specific, not only after transplantation, but also in the case of autoimmunity and allergy. At the moment, the generation of such cell types is very time-consuming and not suitable for clinical routine. In addition, it is not yet fully understood how these cells elicit a desired protective immune response in vivo and how the risks of an excessive immune suppression can be managed. The rat is one of the most important animal models in biomedical research. It is therefore surprising that tolerogenic DC and Treg cells in particular have not been more thoroughly investigated in this model. Thus, the aim of the present study was to systematically characterize these immune cells and investigate their impact on the immune system. Tolerogenic DC were generated from bone marrow precursors cultured with GM-CSF and IL-4 (= IL-4 DC). The proportion of naturally occurring Treg cells with a CD4posCD25posFoxp3pos phenotype comprises approximately 5-8% of the peripheral CD4pos T cells. The characterization of IL-4 DC revealed an up to 26-fold reduced expression of surface molecules such as MHC class II molecules, CD80, CD86, ICAM-1 and CD25 in comparison to mature splenic DC (S-DC). This low expression did not change when the cells where stimulated with different maturation-inducing signals such as replating, LPS, TNF- α and CD40L. Thus, these cells possess a robust phenotype resistant to maturation-inducing stimuli. IL-4 DC take up antigen via endocytosis and are not able to activate naïve T cells or to restimulate antigen-specific T cells. Furthermore, they are able to inhibit and prolongate mature S-DC induced T cell proliferation as well as mature S-DC induced restimulation of antigen-specific T cells, respectively. Thereby, the T cell proliferation was reduced up to 95%. This strong inhibitory effect was mediated within 24 hours in association with a reduced cytokine production (IL-2 about 49% and IFN-γ about 92%). The inhibitory properties of IL-4 DC don´t seem to be caused exclusively by the reduced expression of co-stimulatory molecules. In this study, the detection of the inhibitory molecules PD-L1 and PD-L2 on IL-4 DC suggests they have an impact on mediating inhibitory signals to the T cells. In addition, a suppressive effect of soluble factors was shown. The supernatant of one million IL-4 DC, collected after a 24 hour culture, suppressed mature S-DC induced proliferation of naïve T cells by about 90%. TGF-β, which was detected in the supernatant (up to 300 pg/ml), appears to be the causing soluble factor for this immune inhibition. By contrast, the supernatants of mature S-DC, which did not inhibit the activation of T cells, showed a TGF-β concentration of only about 100 pg/ml. The cytotoxic nitric oxide does not contribute to the IL-4 DC-mediated inhibition of T cell proliferation. The NO synthase inhibitor NMMA reduced the amount of NO by about 50%, but the decreased NO levels did not influence T cell proliferation. Indeed, IL-4 DC are not able to induce T cell proliferation, but this doesn´t mean that there is no change on the molecular level. For instance, T cells co-cultured with IL-4 DC during a first culture are not able to proliferate in the presence of mature S-DC during a second culture. This anergic-like state, however, could be abolished by adding exogenous IL-2. In addition, T cells co-cultured with IL-4 DC are able to inhibit the activation of naïve T cells. Naïve and activated T cells were not able to inhibit the mature S-DC induced T cell proliferation. This observation suggests the induction of Treg cells and was investigated in more detail. Indeed, flow cytometric analysis showed a 1.6-fold expansion of CD4posCD25posFoxp3pos T cells from naturally occurring Treg cells in the presence of IL-4 DC. Thereby, the expansion of CD4posCD25posFoxp3pos T cells occurs independently of the maturation state of DC. Both immature IL-4 DC as well as mature S-DC were able to expand the percentage of naturally occurring Treg cells. However, Treg cells pre-incubated with mature S-DC demonstrated a diminished inhibitory effect compared to Treg cells pre-incubated with IL-4 DC. Treg cells pre-incubated with IL-4 DC were able to inhibit the activation of naïve T cells. In this study it was shown that the regulatory potential of DC cannot be deduced solely by their phenotype or maturation state. Other factors, such as functional properties, need to taken into consideration, too. The induction of Treg cells with suppressive properties induced by in vitro generated tolerogenic IL-4 DC might provide an important mechanism for the maintenance of peripheral tolerance. However, for clinical application further investigation is necessary, not only to understand the interactions between tolerogenic DC and Treg cells, but also to investigate the impact of the transfer of a larger quantity of regulatory cells on the immune system of the recipient.