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The oncogenic MYC protein is a transcriptional regulator of multiple cellular processes and is aberrantly activated in a wide range of human cancers. MYC is an unstable protein rapidly degraded by the ubiquitin-proteasome system. Ubiquitination can both positively and negatively affect MYC function, but its direct contribution to MYC-mediated transactivation remained unresolved.
To investigate how ubiquitination regulates MYC activity, a non-ubiquitinatable MYC mutant was characterized, in which all lysines are replaced by arginines (K-less MYC). The absence of ubiquitin-acceptor sites in K-less MYC resulted in a more stable protein, but did not affect cellular localization, chromatin-association or the ability to interact with known MYC interaction partners.
Unlike the wild type protein, K-less MYC was unable to promote proliferation in immortalized mammary epithelial cells. RNA- and ChIP-Sequencing analyses revealed that, although K-less MYC was present at MYC-regulated promoters, it was a weaker transcriptional regulator. The use of K-less MYC, a proteasomal inhibitor and reconstitution of individual lysine residues showed that proteasomal turnover of MYC is required for MYC target gene induction. ChIP-Sequencing of RNA polymerase II (RNAPII) revealed that MYC ubiquitination is dispensable for RNAPII recruitment and transcriptional initiation but is specifically required to promote transcriptional elongation. Turnover of MYC is required to stimulate histone acetylation at MYC-regulated promoters, which depends on a highly conserved region in MYC (MYC box II), thereby enabling the recruitment of BRD4 and P-TEFb and the release of elongating RNAPII from target promoters. Inhibition of MYC turnover enabled the identification of an intermediate in MYC-mediated transactivation, the association of MYC with the PAF complex, a positive elongation factor, suggesting that MYC acts as an assembly factor transferring elongation factors onto RNAPII. The interaction between MYC and the PAF complex occurs via a second highly conserved region in MYC’s amino terminus, MYC box I.
Collectively, the data of this work show that turnover of MYC coordinates histone acetylation with recruitment and transfer of elongation factors on RNAPII involving the cooperation of MYC box I and MYC box II.
SNAP25 (Synaptosomal-Associated Protein of 25 kDa; part of the SNARE complex) is involved in the docking and fusion of synaptic vesicles in presynaptic neurons necessary for the regulation of neurotransmitter release, as well as in axonal growth and synaptic plasticity. In humans, different single nucleotide polymorphisms of SNAP25 have repeatedly been associated with attention deficit/hyperactivity disorder (ADHD). Thus, in this study heterozygous Snap25 knockout mice were investigated as a model of ADHD.
Heterozygous (+/-) Snap25 knockout mice as well as their wild-type (+/+) littermates were reared under control conditions or underwent a Maternal Separation (MS) procedure. Starting at the age of 2 months, mice were tested for locomotor activity in a repeated long-term Open Field (OF) task, for attention deficits and impulsive behavior in the 5 Choice Serial Reaction Time Task (5CSRTT), for anxiety-like behavior in the Light-Dark Box (LDB) and for depression-like behavior in the Porsolt Forced Swim Test (FST). The brains of these mice were subsequently tested for the expression of several ADHD related genes in a quantitative Real-Time PCR (qRT-PCR) study. Another group of female mice (+/+; +/-) underwent a one hour OF test after oral administration of 45 mg/kg Methylphenidate (MPH) or placebo.
To find an optimized dosage for this MPH challenge, a pilot study was performed. Wild-type C57BL/6 mice were tested in a long-term OF with several dosages of MPH both intraperitoneally (i.p.) and orally. The brains of these animals were afterwards investigated for neurotransmitter concentrations. In this pilot study the dosages of MPH that were similarly behaviorally effective without causing symptoms of overdosing were 7.5-15 mg/kg intraperitoneally and 30-60 mg/kg orally. However, even though it was possible to find intraperitoneal and oral doses that correlate behaviorally, the neurochemistry was mostly different.
In the study on Snap25-deficient mice, unstressed controls showed a hyperactive phenotype in the second of two long-term OF sessions (60 min) spaced three weeks apart. Considering all groups, there was a significant interaction of stress and genotype in the second session, with animals subjected to MS being overall hyperactive with no genotype differences. In the training phase of the 5CSRTT only effects of stress were found, with MS animals finding and consuming fewer rewards. In the single test trial, several genotype effects became apparent, with tendencies for the number of correct nose pokes and the number of rewards eaten, and a significant effect for the number of rewards eaten directly after the correct response. In all of these variables +/- mice performed worse than their wild-type littermates. In the LDB +/- mice entered the lit compartment of the arena earlier than the controls, thus showing attenuated anxiety-like behavior. Regarding depressive-like behavior in the FST, male +/- mice spent significantly less time struggling than male +/+ mice. In the gene expression study, +/- mice had lower expression levels of Maoa and Comt, and higher expression levels of Nos1 than wild-types. Finally, the locomotor activity response to MPH was exaggerated in +/- mice as compared to controls.
Heterozygous Snap25 knockout mice show some of the behavioral characteristics of ADHD, as for example a mild hyperactivity in a familiar environment, difficulties in the correct execution of a given task and even some behavior that can be interpreted as delay aversion. Additionally, expression levels of three ADHD related genes were changed in these animals. Although the exaggerated locomotor activity response to MPH is not to be expected of an ADHD model, the difference in the response between +/+ and +/- mice nonetheless implicates a potential dysfunction of the brain dopaminergic system.
Burkitt lymphoma (BL) is a highly aggressive B cell malignancy. Rituximab, a humanized antibody against CD20, in a combination with chemotherapy is a current treatment of choice for B-cell lymphomas including BL. However, certain group of BL patients are resistant to Rituximab therapy. Therefore, alternative treatments targeting survival pathways of BL are needed.
In BL deregulation of MYC expression, together with additional mutations, inhibits differentiation of germinal centre (GC) B cells and drives proliferation of tumor cells. Pro-apoptotic properties of MYC are counteracted through the B-cell receptor (BCR) and phosphoinositide-3-kinase (PI3K) pathway to ensure survival of BL cells. In normal B-cells BCR triggering activates both NF-κB and NFAT-dependent survival signals. Since BL cells do not exhibit constitutive NF-κB activity, we hypothesized that anti-apoptotic NFATc1A isoform might provide a major survival signal for BL cells.
We show that NFATc1 is constitutively expressed in nuclei of BL, in BL cell lines and in Eµ-Myc–induced B cell lymphoma (BCL) cells. Nuclear residence of NFATc1 in these entities depends on intracellular Ca2+ levels but is largely insensitive to cyclosporine A (CsA) treatment and therefore independent from calcineurine (CN) activity. The protein/protein interaction between the regulatory domain of NFATc1 and DNA binding domain of BCL6 likely contributes to sustained nuclear residence of NFATc1 and to the regulation of proposed NFATc1-MYC-BCL6-PRDM1 network in B-cell lymphomas.
Our data revealed lack of strict correlation between the expression of six NFATc1 isoforms in different BL-related entities suggesting that both NFATc1/alphaA and -betaA isoforms provide survival functions and that NFATc1alpha/betaB and -alpha/betaC isoforms either do not possess pro-apoptotic properties in BL cells or these properties are counterbalanced. In addition, we show that in BL entities expression of NFATc1 protein is largely regulated at post-transcriptional level, including MYC dependent increase of protein stability.
Functionally we show that conditional inactivation of Nfatc1 gene in Eµ-Myc mice prevents development of BCL tumors with mature B cell immunophenotype (IgD+). Loss of NFATc1 expression in BCL cells ex vivo results in apoptosis of tumor cells.
Together our results identify NFATc1 as an important survival factor in BL cells and, hence, as a promising target for alternative therapeutic strategies for BL.
Sustained anxiety is considered as a chronic and future-oriented state of apprehension that does not belong to a specific object. It is discussed as an important characteristic of anxiety disorders including panic disorder, generalized anxiety disorder (GAD) and posttraumatic stress disorder (PTSD). Experimentally, sustained anxiety can be induced by contextual fear conditioning in which aversive events are unpredictably presented and therefore the whole context becomes associated with the threat. This thesis aimed at investigating important mechanisms in the development and maintenance of sustained anxiety: (1) facilitated acquisition and resistant extinction of contextual anxiety due to genetic risk factors (Study 1), and (2) the return of contextual anxiety after successful extinction using a new reinstatement paradigm (Study 2). To this end, two contextual fear conditioning studies were conducted in virtual reality (VR). During acquisition one virtual office was paired with unpredictable mildly painful electric stimuli (unconditioned stimulus, US), thus becoming the anxiety context (CXT+). Another virtual office was never paired with any US, thus becoming the safety context (CXT-). Extinction was conducted 24 h later, i.e. no US was presented, and extinction recall was tested another 24 h later on Day 3. In both studies context-evoked anxiety was measured on three different response levels: behavioral (anxiety-potentiated startle reflex), physiological (skin conductance level), and verbal (explicit ratings). In Study 1, participants were stratified for 5-HTTLPR (S+ risk allele vs. LL no risk allele) and NPSR1 rs324981 (T+ risk allele vs. AA no risk allele) polymorphisms, resulting in four combined genotype groups with 20 participants each: S+/T+, S+/LL, LL/T+, and LL/AA. Results showed that acquisition of anxiety-potentiated startle was influenced by a gene × gene interaction: only carriers of both risk alleles (S+ carriers of the 5-HTTLPR and T+ carriers of the NPSR1 polymorphism) exhibited significantly higher startle magnitudes in CXT+ compared to CXT-. However, extinction recall as measured with anxiety-potentiated startle was not affected by any genotype. Interestingly, the explicit anxiety level, i.e. valence and anxiety ratings, was only influenced by the NPSR1 genotype, in a way that no risk allele carriers (AA) reported higher anxiety and more negative valence in response to CXT+ compared to CXT-, whereas risk allele carriers (T+) did not. Study 2 adopted nearly the same paradigm with the modification that one group (reinstatement group) received one unsignaled US at the beginning of the experimental session on Day 3 before seeing CXT+ and CXT-. The second group served as a control group and received no US, but was immediately exposed to CXT+ and CXT-. Results showed a return of anxiety on the implicit and explicit level (higher startle responses and anxiety ratings in response to CXT+ compared to CXT-) in the reinstatement group only. Most important, the return of contextual anxiety in the reinstatement group was associated with a change of state anxiety and mood from extinction to test, that is the more anxiety and negative mood participants experienced before the reinstatement procedure, the higher their return of anxiety was. In sum, results of Study 1 showed that facilitated contextual fear conditioning on an implicit behavioral level (startle response) could be regarded as an endophenotype for anxiety disorders, which can contribute to our understanding of the etiology of anxiety disorders. Results of Study 2 imply that anxiety and negative mood after extinction could be an important facilitator for the return of anxiety. Furthermore, the present VR-based contextual fear conditioning paradigm seems to be an ideal tool to experimentally study mechanisms underlying the acquisition and the return of anxiety. Future studies could investigate clinical samples and extend the VR paradigm to evolutionary-relevant contexts (e.g., heights, darkness, open spaces).
Spreading drug resistances among Gram-negative pathogens and the paucity of new agents on the antibacterial drug market against these tenacious bacteria create a pressing need for the development of new antibiotics. The bacterial fatty acid biosynthesis pathway FAS-II, especially the enoyl-ACP reductase catalyzing the last step of the elongation cycle, is an established drug target against tuberculosis but has not been extensively exploited for drug design against other bacterial pathogens. In this thesis the enoyl-ACP reductases of the Gram-negative biothreat organisms Burkholderia pseudomallei and Yersinia pestis were targeted in a structure-based drug design approach. The structure of the most recently identified enoyl-ACP isoenzyme FabV was characterized by X-ray crystallography and could be determined in three different states. FabV from B. pseudomallei was obtained in the apo-form of the enzyme, whereas FabV from Y. pestis was characterized in a binary complex with the cofactor NADH as well as in a ternary complex with NADH and the triclosan-based 2-pyridone inhibitors PT172 and PT173. Analysis of the FabV structure revealed the typical fold of the short chain dehydrogenase/reductase superfamily with the NADH-binding Rossmann fold and a substrate-binding pocket with a conserved active site geometry compared to the related isoenzyme FabI. Additional structural elements of FabV are located around the active site. The monomeric form of the enzyme is thereby stabilized and the substrate-binding loop is kept in a closed, helical conformation. The ternary complexes of FabV exhibited a similar inhibitor-binding mode as observed for triclosan inhibition in FabI and point to a potential substrate-binding mechanism. B. pseudomallei possesses FabI as an additional enoyl-ACP reductase isoenzyme, which was structurally characterized in the apo form and in ternary complexes with NAD+ and the diphenyl ether inhibitors triclosan, PT02, PT12 or PT404 as well as the 4-pyridone inhibitor PT155. The structural data of the ternary enoyl-ACP reductases complexes of B. pseudomallei and Y. pestis hold the promise for the possibility to develop antibacterials targeting FabV or even both isoenzymes, FabI and FabV, based on the triclosan scaffold.
Molecular and developmental characterization of the Echinococcus multilocularis stem cell system
(2014)
The metacestode larva of Echinococcus multilocularis is the causative agent of alveolar echinococcosis (AE), one of the most dangerous zoonotic diseases in the Northern Hemisphere. Unlike “typical” metacestode larvae from other tapeworms, it grows as a mass of interconnected vesicles which infiltrates the liver of the intermediate host, continuously forming new vesicles in the periphery. From these vesicles, protoscoleces (the infective form for the definitive host) are generated by asexual budding. It is thought that in E. multilocularis, as in other flatworms, undifferentiated stem cells (so-called germinative cells in cestodes and neoblasts in free-living flatworms) are the sole source of new cells for growth and development. Therefore, this cell population should be of central importance for the progression of AE.
In this work, I characterized the germinative cells of E. multilocularis, and demonstrate that they are indeed the only proliferating cells in metacestode vesicles. The germinative cells are a population of undifferentiated cells with similar morphology, and express high levels of transcripts of a novel non-autonomous retrotransposon family (ta-TRIMs). Experiments of recovery after hydroxyurea treatment suggest that individual germinative cells have extensive self-renewal capabilities. However, germinative cells also display heterogeneity at the molecular level, since only some of them express conserved homologs of fgfr, nanos and argonaute genes, suggesting the existence of several distinct sub-populations. Unlike free-living flatworms, cestode germinative cells lack chromatoid bodies. Furthermore, piwi and vasa orthologs are absent from the genomes of cestodes, and there is widespread expression of some conserved neoblast markers in E. multilocularis metacestode vesicles. All of these results suggest important differences between the stem cell systems of free-living flatworms and cestodes.
Furthermore, I describe molecular markers for differentiated cell types, including the nervous system, which allow for the tracing of germinative cell differentiation. Using these molecular markers, a previously undescribed nerve net was discovered in metacestode vesicles. Because the metacestode vesicles are non-motile, and the nerve net of the vesicle is independent of the nervous system of the protoscolex, we propose that it could serve as a neuroendocrine system. By means of bioinformatic analyses, 22 neuropeptide genes were discovered in the E. multilocularis genome. Many of these genes are expressed in metacestode vesicles, as well as in primary cell preparations undergoing complete metacestode regeneration. This suggests a possible role for these genes in metacestode development. In line with this hypothesis, one putative neuropeptide (RGFI-amide) was able to stimulate the proliferation of primary cells at a concentration of 10-7 M, and the corresponding gene was upregulated during metacestode regeneration.
Atherosclerosis is accepted to be a chronic inflammatory disease of the arterial vessel wall. Several cellular subsets of the immune system are involved in its initiation and progression, such as monocytes, macrophages, T and B cells. Recent research has demonstrated that dendritic cells (DCs) contribute to atherosclerosis, too. DCs are defined by their ability to sense and phagocyte antigens, to migrate and to prime other immune cells, such as T cells. Although all DCs share these functional characteristics, they are heterogeneous with respect to phenotype and origin. Several markers have been used to describe DCs in different lymphoid and non-lymphoid organs; however, none of them has proven to be unambiguous. The expression of surface molecules is highly variable depending on the state of activation and the surrounding tissue. Furthermore, DCs in the aorta or the atherosclerotic plaque can be derived from designated precursor cells or from monocytes. In addition, DCs share both their marker expression and their functional characteristics with other myeloid cells like monocytes and macrophages. The repertoire of aortic DCs in healthy and atherosclerotic mice has just recently started to be explored, but yet there is no systemic study available, which describes the aortic DC compartment. Because it is conceivable that distinct aortic DC subsets exert dedicated functions, a detailed description of vascular DCs is required. The first part of this thesis characterizes DC subsets in healthy and atherosclerotic mice. It describes a previously unrecognized DC subset and also sheds light on the origin of vascular DCs. In recent years, microRNAs (miRNAs) have been demonstrated to regulate several cellular functions, such as apoptosis, differentiation, development or proliferation. Although several cell types have been characterized extensively with regard to the miRNAs involved in their regulation, only few studies are available that focus on the role of miRNAs in DCs. Because an improved understanding of the regulation of DC functions would allow for new therapeutic options, research on miRNAs in DCs is required. The second part of this thesis focuses on the role of the miRNA cluster miR- 17~92 in DCs by exploring its functions in healthy and atherosclerotic mice. This thesis clearly demonstrates for the first time an anti-inflammatory and atheroprotective role for the miR17-92 cluster. A model for its mechanism is suggested.
Platelet activation and aggregation are essential processes for the sealing of injured vessel walls and preventing blood loss. Under pathological conditions, however, platelet aggregation can lead to uncontrolled thrombus formation, resulting in irreversible vessel occlusion. Therefore, precise regulation of platelet activation is required to ensure efficient platelet plug formation and wound sealing but also to prevent uncontrolled thrombus formation. Rapid elevations in the intracellular levels of cations are a core signaling event during platelet activation. In this thesis, the roles of Ca2+ and Mg2+ channels in the regulation of platelet function were investigated.
Orai1, the major store-operated calcium (SOC) channel in platelets, is not only vital for diverse signaling pathways, but may also regulate receptor-operated calcium entry (ROCE). The coupling between the Orai1 signalosome and canonical transient receptor potential channel (TRPC) isoforms has been suggested as an essential step in the activation of store-operated calcium entry (SOCE) and ROCE in human platelets. However, the functional significance of the biochemical interaction between Orai and TRPC isoforms still remains to be answered. In the first part of this thesis, the functional crosstalk between Orai1 and TRPC6 was addressed. Orai1-mediated SOCE was found to enhance the activity of phospholipases (PL) C and D, to increase diacylglycerol (DAG) production and finally to regulate TRPC6-mediated ROCE via DAG, indicating that the regulation of TRPC6 channel activity seems to be independent of the physical interaction with Orai1. Furthermore, Orai1 and TRPC6 double deficiency led to a reduced Ca2+ store content and basal cytoplasmic Ca2+ concentrations, but surprisingly also enhanced ATP secretion, which may enhance Ca2+ influx via P2X1 and compensate for the severe Ca2+ deficits seen in double mutant platelets. In addition, Orai1 and TRPC6 were not essential for G protein-coupled receptor (GPCR)-mediated platelet activation, aggregation and thrombus formation.
Transient receptor potential melastatin-like 7 (TRPM7) contains a cytosolic serine/threonine protein kinase. To date, a few in vitro substrates of the TRPM7 kinase have been identified, however, the physiological role of the kinase remains unknown. In the second part of this thesis, mice with a point mutation which blocks the catalytic activity of the TRPM7 kinase (Trpm7KI) were used to study the role of the TRPM7 kinase in platelet function. In Trpm7KI platelets phosphatidylinositol-4,5-bisphosphate (PIP2) metabolism and Ca2+ mobilization were severely impaired upon glycoprotein (GP) VI activation, indicating that the TRPM7 kinase regulates PLC function. This signaling defect in Trpm7KI platelets resulted in impaired aggregate formation under flow and protected animals from arterial thrombosis and ischemic brain infarction. Altogether, these results highlight the kinase domain of TRPM7 as a pivotal signaling moiety implicated in the pathogenesis of thrombosis and cerebrovascular events.
Background: Nicotine addiction is the most prevalent type of drug addiction that has been described as a cycle of spiraling dysregulation of the brain reward systems. Imaging studies have shown that nicotine addiction is associated with abnormal function in prefrontal brain regions that are important for cognitive emotion regulation. It was assumed that addicts may perform less well than healthy nonsmokers in cognitive emotion regulation tasks. The primary aims of this thesis were to investigate emotional responses to natural rewards among smokers and nonsmokers and to determine whether smokers differ from nonsmokers in cognitive regulation of positive and negative emotions. To address these aims, two forms of appraisal paradigms (i.e., appraisal frame and reappraisal) were applied to compare changes in emotional responses of smokers with that of nonsmokers as a function of appraisal strategies. Experiment 1: The aim of the first experiment was to evaluate whether and how appraisal frames preceding positive and negative picture stimuli affect emotional experience and facial expression of individuals. Twenty participants were exposed to 125 pairs of auditory appraisal frames (either neutral or emotional) followed by picture stimuli reflecting five conditions: unpleasant-negative, unpleasant-neutral, pleasant-positive, pleasant-neutral and neutral-neutral. Ratings of valence and arousal as well as facial EMG activity over the corrugator supercilii and the zygomaticus major were measured simultaneously. The results indicated that appraisal frames could alter both subjective emotional experience and facial expressions, irrespective of the valence of the pictorial stimuli. These results suggest and support that appraisal frame is an efficient paradigm in regulation of multi-level emotional responses. 8 Experiment 2: The second experiment applied the appraisal frame paradigm to investigate how smokers differ from nonsmokers on cognitive emotion regulation. Sixty participants (22 nonsmokers, 19 nondeprived smokers and 19 12-h deprived smokers) completed emotion regulation tasks as described in Experiment 1 while emotional responses were concurrently recorded as reflected by self-ratings and psychophysiological measures (i.e., facial EMG and EEG). The results indicated that there was no group difference on emotional responses to natural rewards. Moreover, nondeprived smokers and deprived smokers performed as well as nonsmokers on the emotion regulation task. The lack of group differences in multiple emotional responses (i.e., self-reports, facial EMG activity and brain EEG activity) suggests that nicotine addicts have no deficit in cognitive emotion regulation of natural rewards via appraisal frames. Experiment 3: The third experiment aimed to further evaluate smokers’ emotion regulation ability by comparing performances of smokers and nonsmokers in a more challenging cognitive task (i.e., reappraisal task). Sixty-five participants (23 nonsmokers, 22 nondeprived smokers and 20 12-h deprived smokers) were instructed to regulate emotions by imagining that the depicted negative or positive scenario would become less negative or less positive over time, respectively. The results showed that nondeprived smokers and deprived smokers responded similarly to emotional pictures and performed as well as nonsmokers in down-regulating positive and negative emotions via the reappraisal strategy. These results indicated that nicotine addicts do not have deficit in emotion regulation using cognitive appraisal strategies. In sum, the three studies consistently revealed that addicted smokers were capable to regulate emotions via appraisal strategies. This thesis establishes the groundwork for therapeutic use of appraisal instructions to cope with potential self-regulation failures in nicotine addicts.
Alzheimer’s disease (AD) is the most prevalent neurodegenerative disease of the brain, which is characterized by a progressive loss of memory and spatial orientation. Only less than 5-10% of AD sufferers are familial cases due to genetic mutations in the amyloid precursor protein (APP) gene or presenilin (PS) 1 and 2 genes. The cause of sporadic AD (sAD) which covers > 95% of AD patients is still unknown. Current research found interactions between aging, diabetes and cognitive decline including dementia in general and in AD in particular. Disturbances of brain glucose uptake, glucose tolerance and utilization and impairment of the insulin/insulin receptor (IR) signaling cascade are thought to be key targets for the development of sAD.
In the brain of AD patients, neural plasticity is impaired indicated by synaptic and neuronal loss. Adult neurogenesis (AN), the generation of functional neurons in the adult brain, may be able to restore neurological function deficits through the integration of newborn neurons into existing neural networks. The dentate gyrus of the hippocampus is one out of few brain regions where life-long AN exists. However, there is a big controversy in literature regarding the involvement of AN in AD pathology. Most animal studies used transgenic mice based on the Amyloid ß (Aß) hypothesis which primarily act as models for the familial form of AD. Findings from human post mortem AN studies were also inconstistent. In this thesis, we focused on the possible involvement of AN in the pathogenesis of the sporadic form of AD. Streptozotocin intracerebroventricularily (STZ icv) treated rats, which develop an insulin-resistant brain state and learning and memory deficits preceding Aß pathology act as an appropriate animal model for sAD. We used STZ treatment for both parts of my work, for the in vivo and in vitro study.
In the first part of my thesis, my coworkers and I investigated STZ icv treatment effects on different stages of AN in an in vivo approach. Even if STZ icv treatment does not seem to considerably influence stem cell proliferation over a short-term (1 month after STZ icv treatment) as well as in a long-term (3 months after STZ icv treatment) period, it results in significantly less immature and newborn mature neurons 3 months after STZ icv treatment. This reduction detected after 3 months was specific for the septal hippocampus, discussed to be important for spatial learning. Subsequently we performed co-localization studies with antibodies detecting BrdU (applied appr. 27 days before sacrifice) and cell-type specific markers such as NeuN, and GFAP, we found that STZ treatment does not affect the differentiation fate of newly generated cells. Phenotype analysis of BrdU-positive cells in the hilus and molecular layer revealed that some of the BrdU-positive cells are newborn oligodendrocytes but not newborn microglia.
In the second part of my thesis I worked with cultured neural stem cells (NSCs) isolated from the adult rat hippocampus to reveal STZ effects on the proliferation of of NSCs, and on the survival and differentiation of their progeny. Furthermore, this in vitro approach enabled me to study cellular mechanisms underlying the observed impaired neurogenesis in the hippocampus of STZ-treated rats. In contrast to our findings of the STZ icv in vivo study we revealed that STZ supplied with the cell culture medium inhibits the proliferation of NSCs in a dose-dependent and time-dependent manner. Moreover, performing immunofluorescence studies with antibodies detecting cell-type specific markers after triggering NSCs to differentiate, we could show that STZ treatment affects the number of newly generated neurons but not of astrocytes. Analyzing newborn cells starting to differentiate and migrate I was able to demonstrate that STZ has no effect on the migration of newborn cells. Trying to reveal cellular mechanisms underlying the negative influence of STZ on hippocampal AN, we performed qRT-PCR and immunofluorescence staining and thus could show that in NSCs the expression of glucose transporter (GLUT)3 mRNA as well as IR and GLUT3 protein levels are reduced after STZ treatment. Therefore, the inhibition of the proliferation of NSCs may be (at least partially) caused by these two molecules. Interestingly, the effect of STZ on differentiating cells was shown to be different, as IR protein expression was not significantly changed but GLUT3 protein levels were decreased in consequence of STZ treatment.
In summary, this project delivered further insights into the interrelation between AN the sporadic form of sAD and thus provides a basis of new therapeutic approaches in sAD treatment through intervening AN. Discrepancies between the results of the two parts of my thesis, the in vivo and in vitro part, were certainly caused to a certain extent by the missing microenvironment in the in vitro approach with cultured NSCs. Future studies e.g. using co-culture systems could at least minimize the effect of a missing natural microenvironment of cultured NSCs, so that the use of an in vitro approach for the investigation of STZ treatment underlying cellular mechanisms can be improved.
Das Empfinden von Schmerz ist für uns überlebenswichtig. Chronischer Schmerz hingegen hat seine physiologische Bedeutung verloren und wird als eigenes Krankheitsbild angesehen. Schmerzempfindung beginnt mit der Nozizeption. Die Zellkörper nozizeptiver Neurone befinden sich in den Spinalganglien (Hinterwurzelganglion, dorsal root ganglion DRG) und Trigeminalganglien (TG). In den DRG-Neuronen macht der Zwei-Poren-Kaliumkanal (K2P) TRESK die Hauptkomponente eines Kaliumstromes, des „standing outward currents“ IKSO, aus. Die physiologische Hauptaufgabe der TRESK-Kanäle liegt in der Regulation der zellulären Erregbarkeit nozizeptiver Neurone. Während einer Entzündungsreaktion werden Entzündungsmediatoren wie Histamin, Bradykinin, Serotonin und Lysophosphatidsäure (LPA) ausgeschüttet und können durch die Aktivierung ihrer G-Protein gekoppelten Rezeptoren (GPCR) oder direkte Interaktion mit Ionenkanälen die nozizeptive Erregung beeinflussen. Durch Anwendung von RT-PCR und eines neu entwickelten Antikörpers wurde die Ko-Expression von TRESK-Kanälen zusammen mit Kanälen der Transient-Receptor-Potential-Kationenkanalfamilie (TRP) und LPA-Rezeptoren in DRG-Neuronen nachgewiesen.
Durch rekombinante Ko-Expression von TRESK-Kanälen und LPA2-Rezeptoren in Xenopus Oozyten konnte durch Zugabe von LPA eine fast 10-fache Aktivierung des basalen K+-Stromes erzielt werden. Die Auswertung der Dosis-Wirkungskurve ergab einen EC50-Wert von 0,2 µM LPA. Die LPA-induzierte TRESK-Stromaktivierung konnte durch die Verwendung des mutierten Kanals TRESK[PQAVAD] oder durch die Zugabe des Phospholipase C (PLC) Inhibitors U73122 verhindert werden. Dies zeigt die Beteiligung des PLC-Signalwegs und die Bindung von Calcineurin an den TRESK-Kanal bei der Stromaktivierung. TRESK ist das einzige Mitglied der K2P-Familie, das eine LPA-induzierte Aktivierung des Stromes zeigt. TREK- und TASK-1-Ströme werden durch LPA inhibiert. In DRG-Neuronen mit kleinem Durchmesser wird Nozizeption durch die Aktivierung von TRPV1-Kanälen durch Hitze oder Capsaicin, dem Inhaltsstoff des Chilis, und zusätzlich durch die Substanz LPA verursacht. Ein weiteres Mitglied der TRP-Familie, der TRPA1-Kanal, ist bei der verstärkten Nozizeption während einer Entzündung involviert. Werden TRESK- und TRP-Kanäle in Xenopus Oozyten ko-exprimiert, verursacht LPA gleichzeitig einen Kationeneinwärts- wie auch -auswärtsstrom. Unter diesen Bedingungen verschob sich das Umkehrpotenzial in einen Bereich zwischen den Umkehrpotenzialen von Oozyten, die nur den K+-Kanal exprimieren und von Oozyten, die nur den unspezifischen Kationenkanal exprimieren. Durch diese Experimente konnte gezeigt werden, dass die LPA-induzierte Ko-Aktivierung von TRP-Kanälen und TRESK zu einer Begrenzung des exzitatorischen Effekts führen kann.
Die DRG-ähnlichen F11-Zellen exprimieren keine TRESK-Kanäle. Sie sind in der Lage durch Strompulse Aktionspotenziale zu generieren. Mit TRESK transfizierte F11-Zellen zeigten eine Verschiebung des Umkehrpotenzials in negative Richtung, einen größeren Auswärtsstrom und den Verlust von spannungsgesteuerten Natriumkanälen. Auch hohe Strompulse konnten keine Aktionspotenziale mehr auslösen.
Bei Spannungs-Klemme-Messungen von primären DRG-Neuronen von TRESK[wt]-Mäusen erhöhte sich der IKSO nach Zugabe von LPA um über 20 %. Im Gegensatz dazu zeigten DRG-Neurone von TRESK[ko]-Mäusen unter diesen Bedingungen eine leichte Hemmung des IKSO von etwa 10 %. In Neuronen, die TRPV1 exprimieren, führte LPA nicht nur zum Anstieg des IKSO, sondern auch zur Aktivierung eines Einwärtsstromes (TRPV1). Im Vergleich dazu wurde in TRESK[ko]-Neuronen durch LPA nur der Einwärtsstrom aktiviert.
In Strom-Klemme-Experimenten führte LPA-Applikation zur Entstehung von Aktionspotenzialen mit höherer Frequenz in Zellen von TRESK[ko]-Mäusen im Vergleich zu Zellen von TRESK[wt]-Mäusen. Zusätzlich wurde die Erregung, die durch Strompulse von 100 pA ausgelöst wurde, in den beiden Genotypen durch LPA unterschiedlich moduliert. Die Aktionspotenzialfrequenz in TRESK[wt]-Neuronen wurde gesenkt, in TRESK[ko]-Neuronen wurde sie erhöht.
Die vorliegende Arbeit zeigt, dass die Erregung nozizeptiver Neurone durch LPA aufgrund der Ko-Aktivierung der TRESK-Kanäle abgeschwächt werden kann. Die Erregbarkeit von sensorischen Neuronen wird strak durch die Aktivität und Expression der TRESK-Kanäle kontrolliert. Deswegen sind TRESK-Kanäle gute Kandidaten für die pharmakologische Behandlung von Schmerzkrankheiten.
Das humane Genom besteht zu ungefähr 8 % aus humanen endogenen Retroviren (HERVs),
jedoch sind viele aufgrund von Mutationen oder Deletionen nicht mehr funktionell. Trotzdem
wurden funktionelle HERV-Proteine gefunden, welche offene Leserahmen (ORFs) besitzen
und für funktionelle Hüll-Glykoproteine wie z.B. Syncytin-1, Syncytin-2 und HML-2
kodieren. Diese HERV-Hüllproteine beinhalten eine suppressive Domäne (SU) und
induzieren möglicherweise eine Immunsuppression diverser Immunzellen während einer
gesunden Schwangerschaft.
In dieser Arbeit wurden spezifisch die modulatorischen Eigenschaften verschiedener HERVHüllproteine
(Syncytin-1, -2 und HML-2) auf Immunzellen untersucht.
Wir konnten zeigen, dass die HERV-Bindungsrezeptoren ASCT-1, -2 und MFSD2A auf der
Oberfläche von T-Zellen und DCs exprimiert werden. Für funktionelle Experimente wurden
HERV-Hüllproteine transgen in CHO-Zellen exprimiert, die als Effektorzellen in Ko-Kultur-
Systemen verwendet wurden. Es konnte keine Hemmung der PMA/Ionomycin-stimulierten
T-Zell-Proliferation durch die Effektorzellen gefunden werden. Darüber hinaus
beeinträchtigten die Effektorzellen nicht die Expression von Reifungsmarkern auf DCs nach
LPS-Aktivierung, induzierten jedoch die Produktion der pro-inflammatorischen Zytokine IL-
12 und TNF-α. Dagegen inhibierten die konstitutiv HERV-Hüllprotein-exprimierenden
Chorionkarzinom-Zelllinien BeWo und JEG die PMA/Ionomycin-stimulierte T-Zell-
Proliferation sehr effektiv. Die Chorionkarzinom-Zelllinien hatten ebenfalls keinen Einfluss
auf die phänotypische LPS-DC-Reifung, modulierten aber die LPS-DC-Zytokin-Antwort sehr
effektiv zu einem suppressiven Profil durch eine Inhibition der pro-inflammatorischen
Zytokine IL-12 und TNF-α sowie einen Anstieg von anti-inflammatorischem IL-10. BeWound
JEG-Zellen, aber auch HERV-Hüllprotein-exprimierende Effektorzellen verändern die
durch LPS-DC-stimulierte allogene T-Zell-Proliferation. Dies war mit einer verringerten
Bildung von DC/T-Zell-Konjugaten sowie mit einer Hemmung der IFN-γ-Sekretion und der
Ca2+-Mobilisation dieser T-Zellen assoziiert. Des Weiteren wurden eine reduzierte p-Tyrosin-
Akkumulation und kein Ausschluss des F-Aktin-Signals in der immunologischen Synapse,
der Kontaktstelle dieser DC/T-Zell-Konjugate, gefunden.
Zusammenfassend lassen diese Ergebnisse vermuten, dass HERV-Hüllproteine die T-Zell-
Proliferation nicht direkt beeinflussen, sich aber modulierend auf DCs auswirken und dadurch
mit deren allogene T-Zell-Proliferation interferieren.
Accurate information transfer between neurons governs proper brain function. At chemical synapses, communication is mediated via neurotransmitter release from specialized presynaptic intercellular contact sites, so called active zones. Their molecular composition constitutes a precisely arranged framework that sets the stage for synaptic communication.
Active zones contain a variety of proteins that deliver the speed, accuracy and plasticity inherent to neurotransmission. Though, how the molecular arrangement of these proteins influences active zone output is still ambiguous. Elucidating the nanoscopic organization of AZs has been hindered by the diffraction-limited resolution of conventional light microscopy, which is insufficient to resolve the active zone architecture on the nanometer scale. Recently, super-resolution techniques entered the field of neuroscience, which yield the capacity to bridge the gap in resolution between light and electron microscopy without losing molecular specificity. Here, localization microscopy methods are of special interest, as they can potentially deliver quantitative information about molecular distributions, even giving absolute numbers of proteins present within cellular nanodomains.
This thesis puts forward an approach based on conventional immunohistochemistry to quantify endogenous protein organizations in situ by employing direct stochastic optical reconstruction microscopy (dSTORM). Focussing on Bruchpilot (Brp) as a major component of Drosophila active zones, the results show that the cytomatrix at the active zone is composed of units, which comprise on average ~137 Brp molecules, most of which are arranged in approximately 15 heptameric clusters. To test for a quantitative relationship between active zone ultrastructure and synaptic output, Drosophila mutants and electrophysiology were employed. The findings indicate that the precise spatial arrangement of Brp reflects properties of short-term plasticity and distinguishes distinct mechanistic causes of synaptic depression. Moreover, functional diversification could be connected to a heretofore unrecognized ultrastructural gradient along a Drosophila motor neuron.
In acute graft-versus-host disease (GVHD) alloreactive donor T cells selectively damage skin, liver, and the gastrointestinal tract while other organs are rarely affected. The mechanism of this selective target tissue infiltration is not well understood. We investigated the importance of alloantigen expression for the selective organ manifestation by examining spatiotemporal changes of cellular and molecular events after allogeneic hematopoietic cell transplantation (allo-HCT). To accomplish this we established a novel multicolor light sheet fluorescence microscopy (LSFM) approach for deciphering immune processes in large tissue specimens on a single-cell level in 3 dimensions. We combined and optimized protocols for antibody penetration, tissue clearing, and triple-color illumination to create a method for analyzing intact mouse and human tissues. This approach allowed us to successfully quantify changes in expression patterns of mucosal vascular addressin cell adhesion molecule–1 (MAdCAM-1) and T cell responses in Peyer’s patches following allo-HCT. In addition, we proofed that LSFM is suitable to map individual T cell subsets after HCT and detected rare cellular events. We employed this versatile technique to study the role of alloantigen expression for the selective organ manifestation after allo-HCT. Therefore, we used a T cell receptor (TCR) transgenic mouse model of GVHD that targets a single peptide antigen and thereby mimics a major histocompatibility complex (MHC)-matched single antigen mismatched (miHAg-mismatched) HCT. We transplanted TCR transgenic (OT-I) T cells into myeloablatively conditioned hosts that either express the peptide antigen ovalbumin ubiquitously (βa-Ova) or selectively in the pancreas (RIP-mOva), an organ that is normally not affected by acute GVHD. Of note, at day+6 after HCT we observed that OT-I T cell infiltration occurred in an alloantigen dependent manner. In βa-Ova recipients, where antigen was ubiquitously expressed, OT-I T cells infiltrated all organs and were not restricted to gastrointestinal tract, liver, and skin. In RIP-mOva recipients, where cognate antigen was only expressed in the pancreas, OT-I T cells selectively infiltrated this organ that is usually spared in acute GVHD. In conditioned RIP-mOva the transfer of 100 OT-I T cells sufficed to effectively infiltrate and destroy pancreatic islets resulting in 100% mortality. By employing intact tissue LSFM in RIP-mOva recipients, we identified very low numbers of initial islet infiltrating T cells on day+4 after HCT followed by a massive T cell migration to the pancreas within the following 24 hours. This suggested an effective mechanism of effector T cell recruitment to the tissue of alloantigen expression after initial antigen specific T cell encounter. In chimeras that either expressed the model antigen ovalbumin selectively in hematopoietic or in parenchymal cells only, transplanted OT-I T cells infiltrated target tissues irrespective of which compartment expressed the alloantigen. As IFN-γ could be detected in the serum of transplanted ovalbumin expressing recipients (βa-Ova, βa-Ova-chimeras and RIP-mOva) at day+6 after HCT, we hypothesized that this cytokine may be functionally involved in antigen specific OT-I T cell mediated pathology. In vitro activated OT-I T cells responded with the production of IFN-γ upon antigen re-encounter suggesting that IFN-γ might be relevant in the alloantigen dependent organ infiltration of antigen specific CD8+ T cell infiltration after HCT. Based on these data we propose that alloantigen expression plays an important role in organ specific T cell infiltration during acute GVHD and that initial alloreactive T cells recognizing the cognate antigen propagate a vicious cycle of enhanced T cell recruitment that subsequently culminates in the exacerbation of tissue restricted GVHD.
The Notch signaling pathway is crucial for mammalian heart development. It controls cell-fate decisions, coordinates patterning processes and regulates proliferation and differentiation. Critical Notch effectors are Hey bHLH transcription factors (TF) that are expressed in atrial (Hey1) and ventricular (Hey2) cardiomyocytes (CM) and in the developing endocardium (Hey1/2/L). The importance of Hey proteins for cardiac development is demonstrated by knockout (KO) mice, which suffer from lethal cardiac defects, such as ventricular septum defects (VSD), valve defects and cardiomyopathy. Despite this clear functional relevance, little is known about Hey downstream targets in the heart and the molecular mechanism by which they are regulated.
Here, I use a cell culture system with inducible Hey1, Hey2 or HeyL expression to study Hey target gene regulation in HEK293 cells, in murine embryonic stem cells (ESC) and in ESC derived CM. In HEK293 cells, I could show that genome wide binding sites largely overlap between all three Hey proteins, but HeyL has many additional binding sites that are not bound by Hey1 or Hey2. Shared binding sites are located close to transcription start sites (TSS) where Hey proteins preferentially bind to canonical E boxes, although more loosely defined modes of binding exist. Additional sites only bound by HeyL are more scattered across the genome. The ability of HeyL to bind these sites depends on the C-terminal part of the protein. Although there are genes which are differently regulated by HeyL, it is unclear whether this regulation results from binding of additional sites by HeyL.
Additionally, Hey target gene regulation was studied in ESC and differentiated CM, which are more relevant for the observed cardiac phenotypes. ESC derived CM contract in culture and are positive for typical cardiac markers by qRT PCR and staining. According to these markers differentiation is unaffected by prolonged Hey1 or Hey2 overexpression. Regulated genes are largely redundant between Hey1 and Hey2. These are mainly other TF involved in e.g. developmental processes, apoptosis, cell migration and cell cycle. Many target genes are cell type specifically regulated causing a shift in Hey repression of genes involved in cell migration in ESC to repression of genes involved in cell cycle in CM.
The number of Hey binding sites is reduced in CM and HEK293 cells compared to ESC, most likely due to more regions of dense chromatin in differentiated cells. Binding sites are enriched at the proximal promoters of down-regulated genes, compared to up-or non-regulated genes. This indicates that up-regulation primarily results from indirect effects, while down-regulation is the direct results of Hey binding to target promoters. The extent of repression generally correlates with the amount of Hey binding and subsequent recruitment of histone deacetylases (Hdac) to target promoters resulting in histone H3 deacetylation.
However, in CM the repressive effect of Hey binding on a subset of genes can be annulled, likely due to binding of cardiac specific activators like Srf, Nkx2-5 and Gata4. These factors seem not to interfere with Hey binding in CM, but they recruit histone acetylases such as p300 that may counteract Hey mediated histone H3 deacetylation. Such a scenario explains differential regulation of Hey target genes between ESC and CM resulting in gene and cell-type specific regulation.
LIM and SH3 protein 1 (LASP1) is a nucleocytoplasmic scaffolding protein. LASP1 interacts with various cytoskeletal proteins via its domain structure and is known to participate in physiological processes of cells. In the present study, a detailed investigation of the expression pattern of LASP1 protein in normal skin, melanocytic nevi and melanoma was carried out and the melanocyte–specific function of LASP1 was analyzed. LASP1 protein was identified in stratum basale of skin epidermis and a very high level was detected in nevi, the benign tumor of melanocyte. In the highly proliferative basal cells, an additional distinct nuclear localization of the protein was noted. In different tumor entities, an elevated LASP1 expression and nuclear localization, correlated positively with malignancy and tumor grade. However, LASP1 level was determined to be very low in melanoma and even reduced in metastases. Melanoma is distinguished as the first tumor tested to date – that displayed an absence of elevated LASP1 expression. In addition no significant relation was observed between LASP1 protein expression and clinicopathological parameters in melanoma.
The epidermal melanin unit of skin comprises of melanocytes and keratinocytes. Melanocytes are specialized cells that synthesize the photo protective coloring pigment, melanin inside unique organelles called melanosomes. The presence of LASP1 in melanocytes is reported for the first time through this study and the existence was confirmed by immunoblotting analysis in cultured normal human epidermal melanocyte (NHEM) and in melanoma cell lines, along with the immunohistostaining imaging in normal skin and in melanocytic nevi. LASP1 depletion in MaMel2 cells revealed a moderate increase in the intracellular melanin level independently of de novo melanogenesis, pointing to a partial hindrance in melanin release. Immunofluorescence images of NHEM and MaMel2 cells visualized co-localization of LASP1 with dynamin and tyrosinase concomitant with melanosomes at the dendrite tips of the cells. Melanosome isolation experiments by sucrose density gradient centrifugation clearly demonstrated the presence of LASP1 and the melanosome specific markers tyrosinase and TRP1 in late stage melanosomes.
The study identified LASP1 and dynamin as novel binding partners in melanocytes and provides first evidence for the existence of LASP1 and dynamin (a protein well–known for its involvement in vesicle formation and budding) in melanosomes. Co-localization of LASP1 and dynamin along the dendrites and at the tips of the melanocytes indicates a potential participation of the two proteins in the membrane vesicle fission at the plasma membrane.
In summary, a possible involvement of LASP1 in the actin–dynamin mediated membrane fission and exocytosis of melanin laden melanosome vesicles into the extracellular matrix is suggested.
Myocardial infarction (MI) is a leading cause of death worldwide. Timely restoration of coronary blood flow to ischemic myocardium significantly reduces acute infarct mortality and attenuates ventricular remodeling. However, surviving MI patients frequently develop heart failure, which is associated with reduced quality of life, high mortality rate (10% annually), as well as high healthcare expenditures. The main processes involved in the evolution of heart failure post-MI are the great loss of contractile cardiomyocytes during ischemia-reperfusion and the subsequent complex structural and functional alterations, which are rooted in modifications at molecular and cellular levels in both the infarcted and non-infarcted myocardium. However, we still lack efficient treatments to prevent the development and progression of left ventricular remodeling. The improved survival rate of acute MI patients combined with the lack of effective therapy for post-MI remodeling contributes to the high prevalence of heart failure. Cardiac Magnetic Resonance Imaging (MRI) is an important tool for diagnosis and assessment of MI. With the advancement of this technology, the frontier of MRI has been extended to probing molecular and cellular events in vivo and non-invasively. In combination with assessment of morphology and function, the visualization of essential molecular and cellular markers in vivo could provide comprehensive, multifaceted views of the healing process in infarcted hearts, which might give new insight for the treatment of acute MI. In this thesis, molecular and cellular cardiac MRI methods were established to visualize and investigate inflammation and calcium flux in the healing process of acute MI in vivo, in a clinically relevant rat model.
The role of host dendritic cells during the effector phase of intestinal graft-versus-host disease
(2014)
Monocytes can be functionally divided in two subsets, both capable to differentiate into dendritic cells (DCs): CX3CR1loCCR2+ classical monocytes, actively recruited to the sites of inflammation and direct precursors of inflammatory DCs; and CX3CR1hiCCR2− non-classical monocytes, characterized by CX3CR1-dependent recruitment to non-inflamed tissues. Yet, the function of non-classical monocyte-derived DCs (nc-mo-DCs), and the factors, which trigger their recruitment and DC differentiation, have not been clearly defined to date. Here we show that in situ differentiated nc-moDCs mediate immunosuppression in the context of intestinal graft-versus-host disease (GVHD).
Employing multi-color confocal microscopy we observed a dramatic loss of steady state host-type CD103+ DC subset immediately after transplantation, followed by an enrichment of immune-regulatory CD11b+ nc-moDCs. Parabiosis experiments revealed that tissue-resident non-classical CX3CR1+ monocytes differentiated in situ into intestinal CD11b+ nc-moDCs after allogeneic hematopoietic cell transplantation (allo-HCT). Differentiation of this intestinal DC subset depended on CSF-1 but not on Flt3L, thus defining the precursors as monocytes and not pre-DCs. Importantly, CX3CR1 but not CCR2 was required for this DC subset differentiation, hence defining the precursors as non-classical monocytes. In addition, we identify PD-L1 expression by CX3CR1+ nc-moDCs as the major mechanism they employ to suppress alloreactive T cells during acute intestinal GVHD. All together, we demonstrate that host nc-moDCs surprisingly mediate immunosuppression in the context of murine intestinal GVHD – as opposed to classical “inflammatory” monocyte-derived dendritic cells (mo-DCs) – via coinhibitory signaling. This thorough study unravels for the first time a biological function of a - so far only in vitro and phenotypically described - DC subset. Our identification of this beneficial immunoregulatory DC subset points towards alternate future strategies in underpinning molecular pathways to foster their function. We describe an unexpected mechanism of nc-moDCs in allo-HCT and intestinal GVHD, which might also be important for autoimmune disorders or infections of the gastrointestinal tract.
Stress has been shown to influence neuroplasticity and is suspected to increase the risk for psychiatric disorders such as major depression and anxiety disorders. Additionally, the short variant of the human serotonin transporter (5-HTT) length polymorphism (5-HTTLPR) is suggested to increase the risk for the development of such disorders. While stress as well as serotonergic signaling are not only discussed to be involved in the development of psychiatric disorders, they are also known to influence hippocampal adult neurogenesis (aN). Therefore, it has long been suspected that aN is involved in the etiology of these illnesses. The exact role of aN in this context however, still remains to be clarified.
In the present doctoral thesis, I am introducing two different studies, which had been carried out to assess possible changes in neuroplasticity and behavior as a result of 5-HTT genotype by stress interactions. In both studies, animals of the 5-HTT knock-out (5-HTT-/-) mouse line were used, which have been found to exhibit increased anxiety- and depression-related behavior, an altered stress response and decreased aggressive behavior. The aim of the first study, the so-called Spatial Learning study, had been to evaluate whether mice with altered levels of brain 5-HT as a consequence of lifelong 5-HTT deficiency perform differently in two spatial memory tests, the Morris Water Maze (WM) and the Barnes Maze (BM) test prospectively differing in aversiveness. Mice of the Spatial Learning study were of male sex and six months of age, and where subjected to a total of 10 (BM) or 15 (WM) trials. My particular interest was to elucidate if there are genotype by treatment interactions regarding blood plasma corticosterone levels and, if neurobiological equivalents in the brain to the found behavioral differences exist. For this purpose I carried out a quantitative immunohistochemistry study, investigating stem cell proliferation (via the marker Ki67) and aN (via the immature neuron marker NeuroD), as well as expression of the two immediate early genes (IEGs) Arc and cFos as a markers for neuronal activity in the hippocampus. The aim of the second study, the chronic mild stress (CMS) study had been to evaluate whether the innate divergent depression-like and anxiety-like behavior of mice with altered levels of brain 5-HT as a consequence of 5-HTT-deficiency is altered any further after being subjected to a CMS paradigm. Two cohorts of one-year-old female mice had been subjected to a variety of unpredictable stressors. In order to exclude possible interfering influences of behavioral testing on corticosterone levels and the outcome of the quantitative immunohistochemistry study the first cohort had been behaviorally tested after CMS while the second one had remained behaviorally untested. The objective of my part of the study was to find out about possible genotype by treatment interactions regarding blood plasma corticosterone as well as regarding aN in the hippocampus of the mice that had been subjected to CMS. For this purpose I performed a quantitative immunohistochemistry study in order to investigate the phenomenon of adult neurogenesis (via Ki67, NeuroD and the immature neuron marker DCX).
Both studies led to interesting results. In the CMS study, we could not replicate the increased innate anxiety- and depression-like behavior in 5-HTT-/- mice known from the literature. However, with regard to the also well documented reduced locomotor activity, as well as the increased body weight of 5-HTT-/- mice compared to their 5-HTT+/- and 5-HTT+/+ littermates, we could demonstrate that CMS leads to increased explorative behavior in the Open Field Test and the Light/Dark Box primarily in 5-HTT+/- und 5-HTT+/+ mice. The Spatial learning study revealed that increased stress sensitivity of 5-HTT-/- mice leads to a poorer performance in the WM test in relation to their 5-HTT+/+ and 5-HTT+/- littermates. As the performance of 5-HTT-/- mice in the less aversive BM was undistinguishable from both other genotypes, we concluded that the spatial learning ability of 5-HTT-/- mice is comparable to that of both other genotypes. As far as stress reactivity is concerned, the experience of a single trial of either the WM or the BM resulted in increased plasma corticosterone levels, irrespective of the 5-HTT genotype. After several trials 5-HTT-/- mice exhibited higher corticosterone concentrations compared with both other genotypes in both tests. Blood plasma corticosterone levels were highest in 5-HTT-/- mice tested in the WM indicating greater aversiveness of the WM and a greater stress sensitivity of 5-HTT deficient mice. In the CMS study, the corticosterone assessment of mice of cohort 1, which had undergone behavioral testing before sacrifice, resulted in significantly elevated corticosterone levels in 5-HTT-/- mice in relation to their 5-HTT+/+ controls. Contrary, corticosterone levels in mice of cohort 1, which had remained behaviorally untested, were shown to be elevated / increased after CMS experience regardless of the 5-HTT genotype. Regarding neuroplasticity, the Spatial Learning study revealed higher baseline levels of cFos- and Arc-ir cells as well as more proliferation (Ki67-ir cells) and higher numbers of neuronal progenitor cells (NeuroD-ir cells) in 5-HTT-/- compared to 5-HTT+/+ mice. Moreover, in 5-HTT-/- mice we could demonstrate that learning performance in the WM correlates with the extent of aN. The CMS study, in which aN (DCX-ir cells), has also been found to be increased in 5-HTT-/- mice compared to their 5-HTT+/+ littermates, yet only in control animals, did show hampered proliferation (Ki67-ir cells) in the hippocampus of all 5-HTT genotypes following CMS experience. Interestingly, the number of immature neurons (DCX-ir cells) was diminished exclusively in 5-HTT-/- mice in response to CMS.
From the Spatial Learning study we concluded, that increased IEG expression and aN levels observed in the hippocampus of 5-HTT deficient mice can be the neurobiological correlate of emotion circuit dysfunction and heightened anxiety of these mice and that 5-HTT-/- animals per se display a “stressed” phenotype as a consequence of long-life 5-HTT deficiency. Due to the different age and sex of the mice in the two studies, they cannot be compared easily. However, although the results of the CMS study seem to contradict the results of the Spatial Learning study at the first glance, they do support the conclusion of the Spatial Learning study by demonstrating that although CMS does have an impact on 5-HTT-/- mice on the neurobiological level (e.g. manifesting in a decrease of DXC-ir cells following CMS) CMS experience cannot add onto their heightened inborn stress-level and is almost ineffective regarding further changes of the behavior of 5-HTT-deficient mice. I thus propose, that 5-HTT-/- mice as a result of lifelong altered 5-HT signaling display a stressed phenotype which resembles a state of lethargy and is paralleled by baseline heightened IEG expression and aN. It cannot be altered or increased by CMS, but it becomes most visible in stressful situations such as repeated spatial learning tests like the WM in which locomotor activity is required.
Platelet activation and aggregation at sites of vascular injury are essential processes to limit blood loss but they also contribute to arterial thrombosis, which can lead to myocardial infarction and stroke. Stable thrombus formation requires a series of events involving platelet receptors which contribute to adhesion, activation and aggregation of platelets. Regulation of receptor expression by (metallo-)proteinases has been described for several platelet receptors, but the molecular mechanisms are ill-defined. The signaling lymphocyte activation molecule (SLAM) family member CD84 is expressed in immune cells and platelets, however its role in platelet physiology was unclear. In this thesis, CD84 deficient mice were generated and analyzed. In well established in vitro and in vivo assays testing platelet function and thrombus formation, CD84 deficient mice displayed phenotypes indistinguishable from wild-type controls. It was concluded that CD84 in platelets does not function as modulator of thrombus formation, but rather has other functions. In line with this, in the second part of this thesis, a novel regulation mechanism for platelet CD84 was discovered and elucidated. Upon platelet activation, the N-terminus of CD84 was found to be cleaved exclusively by the a disintegrin and metalloproteinase 10 (ADAM10), whereas the intracellular part was cleaved by calpain. In addition, regulation of the platelet activating collagen receptor glycoprotein VI (GPVI) was studied and it was shown that GPVI is in contrast to CD84 differentially regulated by ADAM10 and ADAM17. A novel role of CD84 under pathophysiological conditions was revealed as CD84 deficient mice were protected from ischemic stroke in the model of transient middle cerebral artery occlusion and this protection was based on the lack of CD84 in T cells. Ca2+ is an essential second messenger that facilitates activation of platelets and diverse functions in different eukaryotic cell types. Store-operated Ca2+ entry (SOCE) represents the major mechanism leading to rise in intracellular Ca2+ concentration in non-excitable cells. The Ca2+ sensor STIM1 (stromal interaction molecule 1) and the SOC channel subunit protein Orai1 are established mediators of SOCE in platelets. STIM2 is the major STIM isoform in neurons, but the role of the SOC channel subunit protein Orai2 in platelets and neurons has remained elusive. In the third part of this thesis, Orai2 deficient mice were generated and analyzed. Orai2 was dispensable for platelet function, however, Orai2 deficient mice were protected from ischemic neurodegeneration and this phenotype was attributed to defective SOCE in neurons.