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Institute
- Graduate School of Life Sciences (999) (remove)
Sonstige beteiligte Institutionen
- Helmholtz Institute for RNA-based Infection Research (HIRI) (5)
- Universitätsklinikum Münster (3)
- Rudolf Virchow Center for Integrative and Translational Bioimaging, University of Würzburg (2)
- Zentrum für Infektionsforschung (ZINF) Würzburg (2)
- Bio-Imaging Center Würzburg (1)
- 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)
Biological systems are in dynamic interaction. Many responses reside in the core concepts of biological systems interplay (competition and cooperation). In infection situation, the competition between a bacterial system and a host is shaped by many stressors at spatial and temporal determinants. Reactive chemical species are universal stressors against all biological systems since they potentially damage the basic requirements of these systems (nucleic acids, proteins, carbohydrates, and lipids). Either produced endogenously or exogenously, reactive chemical species affect the survival of pathogens including the gram-positive
Staphylococcus aureus (S. aureus). Therefore, bacteria developed strategies to overcome the toxicity of reactive species.
S. aureus is a widely found opportunistic pathogen. In its niche, S. aureus is in permanent contact with surrounding microbes and host factors. Deciphering the deterministic factors
in these interactions could facilitate pinpointing novel bacterial targets. Identifying
the aforementioned targets is crucial to develop new strategies not only to kill the pathogenic organisms but also to enhance the normal flora to minimize the pathogenicity and virulence of potential pathogens. Moreover, targeting S. aureus stress response can be used
to overcome bacterial resistance against host-derived factors. In this study, I identify a novel
S. aureus stress response factor against reactive electrophilic, oxygen, and hypochlorite species to better understand its resilience as a pathogen.
Although bacterial stress response is an active research field, gene function is a current bottleneck in characterizing the understudied bacterial strategies to mediate stress conditions. I aimed at understanding the function of a novel protein family integrated
in many defense systems of several biological systems.
In bacteria, fungi, and plants, old yellow enzymes (OYEs) are widely found. Since the first isolation of the yellow flavoprotein, OYEs are used as biocatalysts for decades to reduce activated C=C bonds in α,β-unsaturated carbonyl compounds. The promiscuity
of the enzymatic catalysis is advantageous for industrial applications.
However, the physiological function of OYEs, especially in bacteria, is still puzzling.
Moreover, the relevance of the OYEs in infection conditions remained enigmatic.
Here, I show that there are two groups of OYEs (OYE flavin oxidoreductase, OfrA and OfrB) that are encoded in staphylococci and some firmicutes. OfrA (SAUSA300_0859) is more conserved than OfrB (SAUSA300_0322) in staphylococci and is a part of the staphylococcal core genome.
A reporter system was established to report for ofrA in S. aureus background.
The results showed that ofrA is induced under electrophilic, oxidative, and hypochlorite stress. OfrA protects S. aureus against quinone, methylglyoxal, hydrogen peroxide,
and hypochlorite stress. Additionally, the results provide evidence that OfrA supports
thiol-dependent redox homeostasis. At the host-pathogen interface, OfrA promotes S. aureus fitness in murine macrophage cell line. In whole human blood, OfrA is involved in S. aureus survival indicating a potential clinical relevance to bacteraemia.
In addition, ofrA mutation affects the production of the virulence factor staphyloxanthin via the upper mevalonate pathway. In summary, decoding OfrA function and its proposed mechanism of action in S. aureus shed the light on a conserved stress response within multiple organisms.
A multitude of human tissues, such as bones, tendons, or muscles, are characterized by a hierarchical and highly ordered structure. In many cases, the loss of these tissues requires reconstruction using biocompatible replacement materials. In the field of bone replacement, the pore structure of the material has a crucial influence. Anisotropic porosity would have the advantage of facilitating the ingrowth of cells and newly formed blood vessels as well as the transport of nutrients.
In this thesis, scaffolds with a highly ordered and anisotropic pore structure were fabricated using unidirectional freezing.
Systematic investigations were carried out on biopolymer solutions (alginate and chitosan) to gain a deeper understanding of the freeze-structuring process. The knowledge gained was then applied to the development of anisotropically structured bone substitute materials. Here, the previously existing material platform for anisotropically structured calcium phosphates was extended to low-temperature phases such as calcium deficient hydroxyapatite (CDHA) or the secondary phosphates monetite and brushite.
After the implantation of a biomaterial, the inevitably triggered initial immune response plays a key role in the success of a graft, with immune cells such as neutrophils or macrophages being of particular importance. In this thesis, the influence of anisotropically structured alpha-TCP and CDHA scaffolds as well as their unstructured references on human monocytes/macrophages was investigated. Macrophages produced extracellular traps (ETs) due to mineral nanoparticles formed by the binding of phosphate and calcium ions to human platelet lysate. In particular, incubation of alpha-TCP samples in lysate containing cell culture medium resulted in pronounced particle formation and enhanced release of ETs.
The ubiquitination of proteins serves as molecular signal to control an enormous number of physiological processes and its dysregulation is connected to human diseases like cancer. The versatility of this signal stems from the diverse ways by which ubiquitin can be attached to its targets. Thus, specificity and tight regulation of the ubiquitination are pivotal requirements of ubiquitin signaling. Ubiquitin-conjugating enzymes (E2s) act at the heart of the ubiquitination cascade, transferring ubiquitin from a ubiquitin-activating enzyme (E1) to a ubiquitin ligase (E3) or substrate. When cooperating with a RING-type E3, ubiquitin-conjugating enzymes can determine linkage specificity in ubiquitin chain formation. Our understanding of the regulation of E2 activities is still limited at a structural level.
The work described here identifies two regulation mechanisms in UBE2S, a cognate E2 of the human RING-type E3 anaphase-promoting complex/cyclosome (APC/C). UBE2S elongates ubiquitin chains on APC/C substrates in a Lys11 linkage-specific manner, thereby targeting these substrates for degradation and driving mitotic progression. In addition, UBE2S was found to have a role in DNA repair by enhancing non-homologous end-joining (NHEJ) and causing transcriptional arrest at DNA damage sites in homologous recombination (HR). Furthermore, UBE2S overexpression is a characteristic feature of many cancer types and is connected to poor prognosis and diminished response to therapy.
The first regulatory mechanism uncovered in this thesis involves the intramolecular auto-ubiquitination of a particular lysine residue (Lys+5) close to the active site cysteine, presumably through conformational flexibility of the active site region. The Lys+5-linked ubiquitin molecule adopts a donor-like, ‘closed’ orientation towards UBE2S, thereby conferring auto-inhibition. Notably, Lys+5 is a major physiological ubiquitination site in ~25% of the human E2 enzymes, thus providing regulatory opportunities beyond UBE2S. Besides the active, monomeric state and the auto-inhibited state caused by auto-ubiquitination, I discovered that UBE2S can adopt a dimeric state. The latter also provides an auto-inhibited state, in which ubiquitin transfer is blocked via the obstruction of donor binding. UBE2S dimerization is promoted by its unique C-terminal extension, suppresses auto-ubiquitination and thereby the proteasomal degradation of UBE2S.
Taken together, the data provided in this thesis illustrate the intricate ways by which UBE2S activity is fine-tuned and the notion that structurally diverse mechanisms have evolved to restrict the first step in the catalytic cycle of E2 enzymes.
Humans spontaneously blink several times a minute. These blinks are strongly modulated during various cognitive task. However, the precise function of blinking and the reason for their modulation has not been fully understood. In the present work, I investigated the function of spontaneous blinks through various perceptual and cognitive tasks. Previous research has revealed that blinks rates decrease during some tasks but increase during others. When trying to understand these seemingly contradictory results, I observed that blink reduction occurs when one engages with an external input. For instance, a decrease has been observed due to the onset of a stimulus, sensory input processing and attention towards sensory input. However, for activities that do not involve such an engagement, e.g. imagination, daydreaming or creativity, the blink rate has been shown to increase. To follow up on the proposed hypothesis, I distinguished tasks that involve the processing of an external stimulus and tasks that involve disengagement.
In the first part of the project, I explored blinking during stimulus engagement. If the probability of blinking is low when engaging with the stimulus, then one should find a reduction in blinks specifically during the time period of processing but not during sensory input per se. To this end, in study 1, I tested the influence of task-relevant information duration on blink timing and additionally manipulated the overall sensory input using a visual and an auditory temporal simultaneity judgement task. The results showed that blinks were suppressed longer for longer periods of relevant information or in other words, blinks occurred at the end of relevant information processing for both the visual and the auditory modality. Since relevance is mediated through top-down processes, I argue that the reduction in blinks is a top-down driven suppression. In studies 2 and 3, I again investigated stimulus processing, but in this case, processing was triggered internally and not based on specific changes in the external input. To this end, I used bistable stimuli, in which the actual physical stimulus remains constant but their perception switches between different interpretations. Studies on the involvement of attention in such bistable perceptual changes indicate that the sensory input is reprocessed before the perceptual switch. The results revealed a reduction in eye blink rates before the report of perceptual switches. Importantly, I was able to decipher that the decrease was not caused by the perceptual switch or the behavioral response but likely started before the internal switch. Additionally, periods between a blink and a switch were longer than interblink intervals, indicating that blinks were followed by a period of stable percept. To conclude, the first part of the project revealed that there is a top-down driven blink suppression during the processing of an external stimulus.
In the second part of the project, I extended the idea of blinks marking the disengagement from external processing and tested if blinking is associated with better performance during internally directed processes. Specifically, I investigated divergent thinking, an aspect of creativity, and the link between performance and blink rates as well as the effect of motor restriction. While I could show that motor restriction was the main factor influencing divergent thinking, the relationship between eye blink rates and creative output also depended on restriction. Results showed that higher blink rates were associated with better performance during free movement, but only between subjects. In other words, subjects who had overall higher blink rates scored better in the task, but when they were allowed to sit or walk freely. Within a single subject, trial with higher blink rates were not associated with better performance. Therefore, possibly, people who are able to disengage easily, as indicated by an overall high blink rate, perform better in divergent thinking tasks. However, the link between blink rate and internal tasks is not clear at this point. Indeed, a more complex measurement of blink behavior might be necessary to understand the relationship.
In the final part of the project, I aimed to further understand the function of blinks through their neural correlates. I extracted the blink-related neural activity in the primary visual cortex (V1) of existing recordings of three rhesus monkeys during different sensory processing states. I analyzed spike related multi-unit responses, frequency dependent power changes, local field potentials and laminar distribution of activity while the animal watched a movie compared to when it was shown a blank screen. The results showed a difference in blink-related neural activity dependent on the processing state. This difference suggests a state dependent function of blinks.
Taken altogether, the work presented in this thesis suggests that eye blinks have an important function during cognitive and perceptual processes. Blinks seem to facilitate a disengagement from the external world and are therefore suppressed during intended processing of external stimuli.
Ubiquitylation is a protein post translational modification, in which ubiquitin is covalently attached to target protein substrates resulting in diverse cellular outcomes. Besides ubiquitin, various ubiquitin-like proteins including FAT10 exist, which are also conjugated to target proteins. The underlying modification mechanisms are conserved. In the initial step, ubiquitin or a ubiquitin-like protein is thioester-linked to a catalytic cysteine in the E1activating enzyme in an ATP-dependent manner. The respective protein modifier is then transferred to an E2 conjugating enzyme in a transthioesterification reaction. Finally, an E3 ubiquitin ligase E3 catalyzes the covalent attachment of the protein modifier to a substrate. In the case of ubiquitin, multiple ubiquitin molecules can be attached to a substrate in the form of either linear or branched polyubiquitin chains but also as single ubiquitin modifications. Depending on the nature of the ubiquitin chain, the substrates are destined to various cellular processes such as their targeted destruction by the proteasome but also non-degradative outcomes may occur.
As stated above FAT10 is a ubiquitin-like protein modifier which typically targets proteins for proteasomal degradation. It consists of two ubiquitin-like domains and is mainly expressed in cells of the human immune system. The reported involvement of FAT10 modifications in cancers and other diseases has caught the attention of the scientific community as an inhibition of the FAT10ylation process may provide avenues for novel therapeutic approaches. UBA6 is the E1 activating enzyme that resides at the apex of the FAT10 proteasomal degradation pathway. UBA6 not only recognizes FAT10 but can also activate ubiquitin as efficiently as the ubiquitin specific E1 UBA1. The dual specificity of UBA6 may complicate the inhibition FAT10ylation since targeting the active site of UBA6 will also inhibit the UBA6-catalyzed ubiquitin activation. Therefore, it is important to understand the underlying principles for the dual specificity of UBA6 prior to the development of compounds interfering with FAT10ylation.
In this thesis important novel insights into the structure and function of UBA6 were derived by X-ray crystallography and biochemical methods. The first crystal structure of UBA6 reveals the multidomain architecture of this enzyme in atomic detail. The enzyme is composed of a rigid core including its active and inactive adenylation domains as well as a 4 helix bundle. Overall, the molecule adopts a “Y” shape architecture with the core at the base and the first and second catalytic half domains forming one arm of the “Y” and the ubiquitin fold domain constituting the other arm. While UBA6 shares the same domain architecture as UBA1, substantial differences were revealed by the crystal structure. In particular, the first catalytic half domain undergoes a significant shift to a position more distal from the core. This rigid body movement is assumed to generate room to accommodate the second ubiquitin-like domain of FAT10. Differences are also observed in a hydrophobic platform between the core and the first catalytic half domain and the adenylation active site in the core, which together from the binding sites for ubiquitin and FAT10. Site directed mutagenesis of key residues in these areas altered the UBA6-catalyzed activation of ubiquitin and FAT10. UBA6 variants were generated with the goal of trying to block the activation of FAT10 while still maintaining that of ubiquitin activation, in order to fully explain the dual specificity of UBA6. However, none of these mutations could block the activation of FAT10, while some of these UBA6 variants blocked ubiquitin activation. Preliminary inhibition assays with a group of E1 inhibitors belonging to the adenosyl sulfamate family demonstrated potent inhibition of FAT10ylation for two compounds. The dual specificity of UBA6 hence needs to be further examined by biochemical and structural methods. In particular, the structure of a complex between UBA6 and ubiquitin or FAT10 would provide key insights for further biochemical studies, ultimately allowing the targeted inhibition of the FAT10ylation machinery.
Anxiety patients overgeneralize fear, also because of an inability to perceptually discriminate threat and safety signals. Therefore, some studies have developed discrimination training that successfully reduced the occurrence of fear generalization. The present work is the first to take a treatment-like approach by using discrimination training after generalization has occurred. Therefore, two studies were conducted with healthy participants using the same fear conditioning and generalization paradigm, with two faces as conditioned stimuli (CSs), and four facial morphs between CSs as generalization stimuli (GSs). Only one face (CS+) was followed by a loud scream (unconditioned stimulus, US). In Study 1, participants underwent either fear-relevant (discriminating faces) or fear-irrelevant discrimination training (discriminating width of lines) or a non-discriminative control training between the two generalization tests, each with or without feedback (n = 20 each). Generalization of US expectancy was reduced more effectively by fear-relevant compared to fear-irrelevant discrimination training. However, neither discrimination training was more effective than non-discriminative control training. Moreover, feedback reduced generalization of US expectancy only in discrimination training. Study 2 was designed to replicate the effects of the discrimination-training conditions in a large sample (N = 244) and examine their benefits in individuals at risk for anxiety disorders. Again, feedback reduced fear generalization particularly well for US expectancy. Fear relevance was not confirmed to be particularly fear-reducing in healthy participants, but may enhance training effects in individuals at risk of anxiety disorder. In summary, this work provides evidence that existing fear generalization can be reduced by discrimination training, likely involving several (higher-level) processes besides perceptual discrimination (e.g., motivational mechanisms in feedback conditions). Its use may be promising as part of individualized therapy for patients with difficulty discriminating similar stimuli.
RNA viruses rely entirely on the host machinery for their protein synthesis and harbor non-canonical translation mechanisms, such as alternative initiation and programmed –1 ribosomal frameshifting (–1PRF), to suit their specific needs. On the other hand, host cells have developed a variety of defensive strategies to safeguard their translational apparatus and at times transiently shut down global translation. An infection can lead to substantial translational remodeling in cells and translational control is critical during antiviral response. Due to their sheer diversity, this control is likely unique to each RNA virus and the intricacies of post-transcriptional regulation are unclear in certain viral species.
Here, we explored different aspects of translational regulation in virus-infected cells in detail. Using ribosome profiling, we extensively characterized the translational landscape in HIV-1 infected T cells, uncovering novel features of gene regulation in both host and virus. Additionally, we show that substantial pausing occurs prior to the frameshift site indicating complex regulatory mechanisms involving upstream viral RNA elements that can act as cis- regulators of frameshifting.
We also characterized the mechanistic details of trans- modulation of frameshifting by host- and virus-encoded proteins. Host antiviral protein ZAP-S binds to the SARS-CoV-2 frameshift site and destabilizes the stimulatory structure, leading to frameshift inhibition. On the other hand, EMCV 2A protein stabilizes the viral frameshift site, thereby, activating EMCV frameshifting. While both proteins were shown to be antagonistic in their mechanism, they interact with the host translational machinery. Furthermore, we showed that frameshifting can be regulated not just by proteins, but also by small molecules. High-throughput screening of natural and synthetic compounds identified two potent frameshift inhibitors that also impeded viral replication, namely trichangion and compound 25. Together, this work largely enhances our understanding of gene regulation mechanisms in virus-infected cells and further validates the druggability of viral –1 PRF site.
Mycobacterium tuberculosis is the causative agent of tuberculosis and responsible for more than eight million new infections and about two million deaths each year. Novel chemotherapeutics are urgently needed to treat the emerging threat of multi drug resistant and extensively drug resistant strains. Cell wall biosynthesis is a widely used target for chemotherapeutic intervention in bacterial infections. In mycobacteria, the cell wall is comprised of mycolic acids, very long chain fatty acids that provide protection and allow the bacteria to persist in the human macrophage. The type II fatty acid biosynthesis pathway in Mycobacterium tuberculosis synthesizes fatty acids with a length of up to 56 carbon atoms that are the precursors of the critical mycobacterial cell wall components mycolic acids. KasA, the mycobacterial ß-ketoacyl synthase and InhA, the mycobacterial enoyl reductase, are essential enzymes in the fatty acid biosynthesis pathway and validated drug targets. In this work, KasA was expressed in Mycobacterium smegmatis, purified and co-crystallized in complex with the natural thiolactone antibiotic thiolactomycin (TLM). High-resolution crystal structures of KasA and the C171Q KasA variant, which mimics the acyl enzyme intermediate of the enzyme, were solved in absence and presence of bound TLM. The crystal structures reveal how the inhibitor is coordinated by the enzyme and thus specifically pinpoint towards possible modifications to increase the affinity of the compound and develop potent new drugs against tuberculosis. Comparisons between the TLM bound crystal structures explain the preferential binding of TLM to the acylated form of KasA. Furthermore, long polyethylene glycol molecules are bound to KasA that mimic a fatty acid substrate of approximately 40 carbon atoms length. These structures thus provide the first insights into the molecular mechanism of substrate recognition and reveal how a wax-like substance can be accommodated in a cytosolic environment. InhA was purified and co-crystallized in complex with the slow, tight binding inhibitor 2-(o-tolyloxy)-5-hexylphenol (PT70). Two crystal structures of the ternary InhA-NAD+-PT70 were solved and reveal how the inhibitor is bound to the substrate binding pocket. Both structures display an ordered substrate binding loop and corroborate the hypothesis that slow onset inhibition is coupled to loop ordering. Upon loop ordering, the active site entrance is more restricted and the inhibitor is kept inside more tightly. These studies provide additional information on the mechanistic imperatives for slow onset inhibition of enoyl ACP reductases.
Malaria and HIV are among the most important global health problems of our time and together are responsible for approximately 3 million deaths annually. These two diseases overlap in many regions of the world including sub-Saharan Africa, Southeast Asia and South America, leading to a higher risk of co-infection. In this study, we generated and characterized hybrid molecules to target P. falciparum and HIV simultaneously for a potential HIV/malaria combination therapy. Hybrid molecules were synthesized by covalent fusion between azidothymidine (AZT) and dihydroartemisinin (DHA), tetraoxane or chloroquine (CQ); and a small library was generated and tested for antiviral and antimalarial activity. Our data suggest that dihyate is the most potent molecule in vitro, with antiplasmodial activity comparable to that of DHA (IC50 = 26 nM, SI > 3000), a moderate activity against HIV (IC50 = 2.9 µM; SI > 35) and safe to HeLa cells at concentrations used in the assay (CC50 > 100 µM). Pharmacokinetic studies further revealed that dihyate is metabolically unstable and is cleaved following an O-dealkylation once in contact with cytochrome P450 enzymes. The later further explains the uneffectiveness of dihyate against the CQ-sensitive P. berghei N strain in mice when administered by oral route at 20 mg/kg. Here, we report on a first approach to develop antimalarial/anti-HIV hybrid molecules and future optimization efforts will aim at producing second generation hybrid molecules to improve activity against HIV as well as compound bioavailability. With the emergence of resistant parasites against all the counterpart drugs of artemisinin derivatives used in artemisinin based combination therapies (ACTs), the introduction of antibiotics in the treatment of malaria has renewed interest on the identification of antibiotics with potent antimalarial properties. In this study we also investigated the antiplasmodial potential of thiostrepton and derivatives, synthesized using combinations of tail truncation, oxidation, and addition of lipophilic thiols to the terminal dehydroamino acid. We showed that derivatives SS231 and SS234 exhibit a better antiplasmodial activity (IC50 = 1 µM SI > 59 and SI > 77 respectively) than thiostrepton (IC50 = 8.95 µM, SI = 1.7). The antiplasmodial activity of these derivatives was observed at concentrations which are not hemolytic and non-toxic to human cell lines. Thiostrepton and derivatives appeared to exhibit transmission blocking properties when administered at their IC50 or IC90 concentrations and our data also showed that they attenuate proteasome activity of Plasmodium, which resulted in an accumulation of ubiquitinated proteins after incubation with their IC80 concentrations. Our results indicate that the parasite’s proteasome could be an attractive target for therapeutic intervention. In this regard, thiostrepton derivatives are promising candidates by dually acting on two independent targets, the proteasome and the apicoplast, with the capacity to eliminate both intraerythrocytic asexual and transmission stages of the parasite. To further support our findings, we evaluated the activity of a new class of antimalarial and proteasome inhibitors namely peptidyl sulfonyl fluorides on gametocyte maturation and analogues AJ34 and AJ38 were able to completely suppress gametocytogenesis at IC50 concentrations (0.23 µM and 0.17 µM respectively) suggesting a strong transmission blocking potential. The proteasome, a major proteolytic complex, responsible for the degradation and re-cycling of non-functional proteins has been studied only indirectly in P. falciparum. In addition, an apparent proteasome-like protein with similarity to bacterial ClpQ/hslV threonine-peptidases was predicted in the parasite. Antibodies were generated against the proteasome subunits alpha type 5 (α5-SU), beta type 5 (β5-SU) and pfhslV in mice and we showed that the proteasome is expressed in both sexual and asexual blood stages of P. falciparum, where they localize in the nucleus and in the cytoplasm. However, expression of PfhslV was only observed in trophozoites and shizonts. The trafficking of the studied proteasome subunits was further investigated by generating parasites expressing GFP tagged proteins. The expression of α5-SU-GFP in transgenic parasite appeared to localize abundantly in the cytoplasm of all blood stages, and no additional information was obtained from this parasite line. In conclusion, our data highlight two new tools towards combination therapy. Hybrid molecules represent promising tools for the cure of co-infected individuals, while very potent antibiotics with a wide scope of activities could be useful in ACTs by eliminating resistant parasites and limiting transmission of both, resistances and disease.
The integrity of its DNA is fundamental for every living cell. However, DNA is constantly threatened by exogenous and endogenous damaging agents that can cause a variety of different DNA lesions. The severe consequences of an accumulation of DNA lesions are reflected in cancerogenesis and aging. Several DNA repair mechanisms ensure the repair of DNA lesions and thus maintain DNA integrity. One of these DNA repair mechanisms is nucleotide excision repair (NER), which is famous for its ability to address a large variety of structurally unrelated DNA lesions. A key component of eukaryotic NER is the transcription factor II H (TFIIH) complex, which is not only essential for DNA repair but also for transcription. The TFIIH complex is composed of ten subunits. How these subunits work together during NER to unwind the DNA around the lesion is, however, not yet fully understood. High-resolution structural data and biochemical insights into the function of every subunit are thus indispensable to understand the functional networks within TFIIH. The importance of an intact TFIIH complex is reflected in the severe consequences of patient mutations in the TFIIH subunits XPB, XPD or p8 leading to the hallmark diseases xeroderma pigmentosum, Cockayne syndrome and trichothiodystrophy. Defects in the NER pathway are further associated with several types of cancer including skin cancer.
The herein described work focused on five TFIIH subunits derived from the thermophilic fungus Chaetomium thermophilum, the p34/p44 pair and the ternary XPB/p52/p8 complex. The interaction between p34 and p44 was characterized based on a high-resolution structure of the p34_vWA/p44_RING minimal complex. Biochemical studies of the p34/p44 interaction led to the disclosure of an additional interaction between the p34 and p44 subunits, which had not been characterized so far. The p34/p44 interaction was shown to be central to TFIIH, which justifies the presence of several redundant interfaces to safeguard the interaction between the two proteins and might explain why so far, no patient mutations in these subunits have been identified. The p52 subunit of TFIIH was known to be crucial to stimulate the ATPase activity of XPB, which is required during NER. This work presents the first entire atomic resolution structural characterization of p52, which was derived of several crystal structures of p52 variants and a p52/p8 variant thereby demonstrating the interaction between p52 and p8. The precise structural model of p52 offered the possibility to investigate interactions with other TFIIH subunits in more detail. The middle domain 2 of p52 and the N-terminal domain of XPB were shown to mediate the main interaction between the two subunits. An analysis of the p52 crystal structures within recently published cryo-electron microscopy structures of TFIIH provides a model of how p52 and p8 stimulate the ATPase activity of XPB, which is essential for NER and transcription. The structural and biochemical findings of this work provide an additional building block towards the uncovering of the architecture and function of this essential transcription factor.
The knee joint is a complex composite joint containing the C-shaped wedge-like menisci composed of fibrocartilage. Due to their complex composition and structure, they provide mechanical resilience to the knee joint protecting the articular cartilage. Because of the limited repair potential, meniscal injuries do not only affect the meniscus itself but also lead to altered joint homeostasis and inevitably to secondary osteoarthritis.
The meniscus was characterized focusing on its anatomy, structure and meniscal markers such as aggrecan, collagen type I (Col I) and Col II. The components relevant for meniscus tissue engineering, namely cells, Col I scaffolds, biochemical and biomechanical stimuli were studied. Meniscal cells (MCs) were isolated from meniscus, mesenchymal stem cells (MSCs) from bone marrow and dermal microvascular endothelial cells (d-mvECs) from foreskin biopsies. For the human (h) meniscus model, wedge-shape compression of a hMSC-laden Col I gel was successfully established. During three weeks of static culture, the biochemical stimulus transforming growth factor beta-3 (TGF beta-3) led to a compact collagen structure. On day 21, this meniscus model showed high metabolic activity and matrix remodeling as confirmed by matrix metalloproteinases detection. The fibrochondrogenic properties were illustrated by immunohistochemical detection of meniscal markers, significant GAG/DNA increase and increased compressive properties. For further improvement, biomechanical stimulation systems by compression and hydrostatic pressure were designed. As one vascularization approach, direct stimulation with ciclopirox olamine (CPX) significantly increased sprouting of hd-mvEC spheroids even in absence of auxiliary cells such as MSCs. Second, a cell sheet composed of hMSCs and hd-mvECs was fabricated by temperature triggered cell sheet engineering and transferred onto the wedge-shaped meniscus model. Third, a biological vascularized scaffold (BioVaSc-TERM) was re-endothelialized with hd-mvECs providing a viable vascularized network. The vascularized BioVaSc-TERM was suggested as wrapping scaffold of the meniscus model by using two suture techniques, the all-inside-repair (AIR) for the posterior horn, and the outside-in-refixation (OIR) for the anterior horn and the middle part.
This meniscus model for replacing torn menisci is a promising approach to be further optimized regarding vascularization, biochemical and biomechanical stimuli.
Bei der zystischen Fibrose (CF) sowie der primären Ziliendyskinesie (PCD) handelt es sich um zwei seltene Erkrankungen, die unter anderem den mukoziliären Transport beeinträchtigen. CF gehört hierbei zu den am häufigsten vorkommenden angeborenen Stoffwechselerkrankungen, wobei Betroffene unter einem Defekt des Cystic Fibrosis Transmembrane Conductor Regulator (CFTR)-Gens leiden, der durch die Produktion von hochviskosem Sekret in muzinproduzierenden Organen, wie dem gastrointestinalen Trakt und der Lunge, gekennzeichnet ist. Patienten, die an PCD leiden, weisen Defekte in, zum jetzigen Zeitpunkt, ca. 38 bekannten und PCD-assoziierten Genen auf, die in strukturellen Defekten des ziliären Apparats und somit in dysfunktionalen Kinozilien resultieren. Da aktuell weder für die CF noch für die PCD eine Heilung möglich ist, steht bei der Therapie vor allem die Linderung der Symptome im Fokus. Grundlegendes Ziel ist der langfristige Erhalt der Lungenfunktion sowie die Prävention bakterieller Infekte. Als bisherige Modellsysteme zur Erforschung möglicher Therapeutika gelten Tiermodelle, die den humanen Phänotyp aufgrund von Speziesdiversität nicht vollständig abbilden können. Als vielversprechende Testsysteme für die zystische Fibrose gelten humane intestinale Organoidkulturen. Nachdem allerdings vorwiegend respiratorische Symptome für die Mortalität der Patienten verantwortlich sind, stellen CF-Atemwegsmodelle bessere Testsysteme für zukünftige Therapeutika dar. Atmungsorganoidkulturen wurden verwendet, um die CFTR-Funktionalität zu untersuchen, repräsentieren aber nicht vollständig die in vivo Situation. Deshalb werden zur Entwicklung neuer Therapiestrategien patientenspezifische 3D in vitro Testsysteme der humanen Atemwege benötigt, die insbesondere im Hinblick auf personalisierte Medizin ihren Einsatz finden. In der vorliegenden Arbeit wurde eine für den Lehrstuhl neue Methode zur Zellgewinnung aus nasalen Schleimhautabstrichen etabliert, die eine standardisierte Versorgung mit humanem Primärmaterial garantiert. Zur Generierung einer krankheitsspezifischen Zelllinie, wie beispielsweise einer PCD-Zelllinie mit Hilfe des CRISPR/Cas9-Systems, ist eine Atemwegszelllinie erforderlich, die die in vivo Situation vollständig repräsentiert. So wurden vier verschiedene respiratorische Epithelzelllinien (HBEC3-KT, Calu-3, VA10 und Cl-huAEC) auf ihren mukoziliären Phänotyp hin untersucht, wobei lediglich die Zelllinie HBEC3-KT in zilientragende Zellen differenzierte. Diese zeigten jedoch nur auf ca. 5 % der Modelloberfläche Kinozilien, wodurch die humane respiratorische Mukosa nicht komplett abgebildet werden konnte und die HBEC3-KT-Zelllinie keine geeignete Zelllinie zur Generierung einer PCD-Zelllinie darstellte. Mit Hilfe des Tissue Engineering war es möglich, 3D in vitro Testsysteme basierend auf zwei unterschiedlichen Matrices, der biologischen SIS (small intestinal submucosa) und der synthetischen Polyethylenterephthalat (PET)-Membran, aufzubauen. Es wurden 3D Atemwegstestsysteme mit humanen primären nasalen und tracheobronchialen Epithelzellen generiert. Ergänzend zu histologischen Untersuchungen und zur Charakterisierung spezifischer Marker des respiratorischen Systems mittels Immunfluoreszenz, wurde die Ultrastruktur der Modelle, mit speziellem Fokus auf ziliäre Strukturen, analysiert. Um Rückschlüsse auf die ziliäre Funktionalität ziehen zu können und somit eine hohe in vivo Korrelation zu bestätigen, wurde im Rahmen dieser Arbeit am Lehrstuhl für Tissue Engineering und Regenerative Medizin die Methode der Hochgeschwindigkeitsvideomikroskopie etabliert, welche die Analyse der Zilienschlagfrequenz sowie des mukoziliären Transports ermöglicht. Ebenfalls wurde der Einfluss von isotoner Kochsalzlösung und des � 2-adrenergen Agonisten Salbutamol, das vor allem als Bronchodilatator bei Asthmapatienten eingesetzt wird, auf die Zilienschlagfrequenz analysiert. Es konnte gezeigt werden, dass beide Substanzen den Zilienschlag im Atemwegsmodell erhöhen. Zur Generierung der Testsysteme der beiden seltenen Erkrankungen CF und PCD wurden Epithelzellen der betroffenen Patienten zunächst mittels nicht-invasiver Raman-Spektroskopie auf einen potentiellen Biomarker untersucht, welcher Einsatz in der Diagnostik der beiden Krankheiten finden könnte. Es konnte jedoch weder für die CF noch für die PCD ein Biomarker aufgedeckt werden. Jedoch zeigten PCD-Zellen eine geringe Auftrennung gegenüber nicht-PCD Zellen. Anschließend wurden 3D-Atemwegstestsysteme basierend auf Patientenzellen aufgebaut. Der Phänotyp der CF-Modelle wurde mittels immunhistologischer Färbung und der Analyse des gestörten mukoziliären Transports verifiziert. Strukturelle ziliäre Defekte konnten durch die ultrastrukturelle Analyse von Zilienquerschnitten in drei donorspezifischen PCD-Modellen identifiziert werden. Darüber hinaus konnte die ziliäre Funktionalität mit Hilfe der Hochgeschwindigkeitsvideomikroskopie nicht nachgewiesen werden. Zusammenfassend ist es in dieser Arbeit gelungen, eine neue Methode zur vollständigen Charakterisierung von 3D-Atemwegstestsystemen zu etablieren, die die Analyse der Zilienschlagfrequenz sowie des mukoziliären Transports ermöglicht. Es konnte erstmalig gezeigt werden, dass mit Hilfe des Tissue Engineering ein personalisiertes Krankheitsmodell für die PCD auf Segmenten eines dezellularisierten porzinen Jejunums generiert werden kann, das zukünftig ein Testsystem für potentielle Therapeutika darstellen kann.
Der Meniskus, ein scheibenförmiger Faserknorpel, spielt im Kniegelenk eine bedeutende Rolle, weil er Kräfte und Druck im Kniegelenk gleichmäßig verteilt, Stöße dämpft sowie der Kraftübertragung und Stabilisierung dient. Durch die Entfernung des Gewebes, der sogenannten Totalmeniskektomie, nach einer Meniskusverletzung oder einem Riss, verändern sich die mechanischen Eigenschaften des Gelenks stark und verursachen durch die erhöhte Belastung der Gelenkflächen Arthrose. Arthrose ist weltweit die Häufigste aller Gelenkerkrankungen. Der Erhalt der körperlichen Leistungsfähigkeit und Mobilität bis ins hohe Alter sowie die Bewahrung der Gesundheit von Herz-Kreislauf- und Stoffwechselorganen zählen aufgrund des demografischen Wandels zu den großen medizinischen Herausforderungen. Die Erkrankung des muskuloskelettalen Systems stellte 2010 im Bundesgebiet die am häufigsten vorkommende Krankheitsart dar.
Während Risse in den äußeren Teilen des Meniskus aufgrund des Anschlusses an das Blutgefäßsystem spontan heilen können, können sie dies in tieferen Zonen nicht. Durch die begrenzte Heilungsfähigkeit des Knorpels bleibt langfristig der Einsatz eines Ersatzgewebes die einzige therapeutische Alternative.
In der vorliegenden Arbeit wurde als therapeutische Alternative erfolgreich ein vaskularisiertes Meniskusersatzgewebe mit Methoden des Tissue Engineering entwickelt. Es soll in Zukunft als Implantat Verwendung finden. Tissue Engineering ist ein interdisziplinäres Forschungsfeld, in dem Gewebe außerhalb des Körpers generiert werden. Schlüsselkomponenten sind Zellen, die aus einem Organismus isoliert werden, und Trägerstrukturen, die mit Zellen besiedelt werden. Die Biomaterialien geben den Zellen eine geeignete Umgebung, die die Extrazelluläre Matrix (EZM) ersetzen soll, um die Funktion der Zellen beizubehalten, eigene Matrix zu bilden. Zum Erhalt eines funktionelles Gewebes werden oftmals dynamische Kultursysteme, sogenannte Bioreaktoren, verwendet, die natürliche Stimuli wie beispielsweise den Blutfluss oder mechanische Kompressionskräfte während der in vitro Reifungsphase des Gewebes, zur Verfügung stellen. Das Gewebekonstrukt wurde auf Basis natürlicher Biomaterialien aufgebaut, unter Verwendung ausschließlich primärer Zellen, die später direkt vom Patienten gewonnen werden können und damit Abstoßungsreaktionen auszuschließen sind. Da der Meniskus teilvaskularisiert ist und die in vivo Situation des Gewebes bestmöglich nachgebaut werden sollte, wurden Konstrukte mit mehreren Zelltypen, sogenannte Ko-Kulturen aufgebaut. Neben mikrovaskulären Endothelzellen (mvEZ) und Meniskuszellen (MZ) erfolgten Versuche mit mesenchymalen Stammzellen (MSZ).
Zur Bereitstellung einer zelltypspezifischen Matrixumgebung, diente den mvEZ ein Stück Schweinedarm mit azellularisierten Gefäßstrukturen (BioVaSc®) und den MZ diente eine geeig- nete Kollagenmatrix (Kollagen Typ I Hydrogel). Die Validierung und Charakterisierung des aufgebauten 3D Meniskuskonstrukts, welches in einem dynamischen Perfusions-Bioreaktorsystem kultiviert wurde, erfolgte mit knorpeltypischen Matrixmarkern wie Aggrekan, Kollagen Typ I, II und X sowie mit den Transkriptionsfaktoren RunX2 und Sox9, die in der Knorpelentstehung von großer Bedeutung sind. Zusätzlich erfolgten Auswertungen mit endothelzellspezifischen Markern wie vWF, CD31 und VEGF, um die Vaskularisierung im Konstrukt nachzuweisen. Analysiert wurden auch die Zellvitalitäten in den Konstrukten.
Aufgrund einer nur geringen Verfügbarkeit von MZ wurden Kulturansätze mit alternativen Zellquellen, den MSZ, durchgeführt. Dafür erfolgte zunächst deren Isolation und Charakterisierung und die Auswahl einer geeigneten 3D Kollagenmatrix. Die beste Zellintegration der MSZ konnte auf einer eigens hergestellten elektrogesponnenen Matrix beobachtet werden. Die Matrix besteht aus zwei unterschiedlichen Kollagentypen, die auf insgesamt fünf Schichten verteilt sind. Die Fasern besitzen weiter unterschiedliche Ausrichtungen. Während die Kollagen Typ I Fasern in den äußeren Schichten keiner Ausrichtung zugehören, liegen die Kollagen Typ II Fasern in der mittleren Schicht parallel zueinander. Der native Meniskus war für den Aufbau einer solchen Kollagen-Trägerstruktur das natürliche Vorbild, das imitiert werden sollte. Nach der Besiedelung der Matrix mit MSZ, konnte eine Integration der Zellen bereits nach vier Tagen bis in die Mittelschicht sowie eine spontane chondrogene Differenzierung nach einer insgesamt dreiwöchigen Kultivierung gezeigt werden. Das Biomaterial stellt in Hinblick auf die Differenzierung der Zellen ohne die Zugabe von Wachstumsfaktoren eine relevante Bedeutung für klinische Studien dar.
Zur Kultivierung des 3D Meniskuskonstrukts wurde ein Bioreaktor entwickelt. Mit diesem können neben Perfusion der Gefäßsysteme zusätzlich Kompressionskräfte sowie Scherspannungen auf das Ersatzgewebe appliziert und die Differenzierung von MZ bzw. MSZ während der in vitro Kultur über mechanische Reize stimuliert werden. Ein anderes Anwendungsfeld für den neuartigen Bioreaktor ist seine Verwendung als Prüftestsystem für die Optimierung und Qualitätssicherung von Gewebekonstrukten.
Eine ausgeprägte Mundtrockenheit, Xerostomie, entsteht häufig durch eine irreversible Funktionseinschränkung der Speicheldrüsen. Diese ist unter anderem durch die Einnahme bestimmter Medikamente, Autoimmunerkrankungen, fortgeschrittenes Alter oder die Bestrahlungstherapie von Tumoren der Kopf-Hals-Region bedingt, wobei letztere eine der häufigsten Ursachen darstellt. Konsequenzen der eingeschränkten Drüsenfunktion sind herabgesetzte Speichelflussraten, eine Reduktion des Mund-pH-Werts, eine veränderte Elektrolyt- und Immunglobulin-Zusammensetzung des Speichels und somit eine Verringerung des Infektionsschutzes. Die resultierenden Komplikationen erstrecken sich von Karies und rezidivierenden Infektionen bis hin zu Pilzbesiedelungen der Mundschleimhaut. Diese schränken die Lebensqualität der Patienten stark ein und führen häufig zu Therapieunterbrechungen. Fast die Hälfte der Patienten leidet unter Depressionen oder psychischen Belastungszuständen. Es gibt wenige Therapieansätze zur Behandlung der postradiogenen Xerostomie: Pilocarpin erhöht zwar die Speichelflussraten, hat jedoch keinen signifikanten Effekt auf die Lebensqualität. Die operative Translokation der Glandula submandibularis hat den Weg in die klinische Routine noch nicht gefunden, während die intensitätsmodulierte Bestrahlung (IMRT) nicht für jeden Patienten geeignet ist; beide zeigen jedoch einen positiven Effekt auf die Lebensqualität. Gentechnische und stammzellbasierte Ansätze zur Regeneration des Drüsengewebes befinden sich im Experimentalstadium. Somit ergibt sich ein dringender Bedarf an innovativen Optionen zur Behandlung der postradiogenen Xerostomie. Das Tissue Engineering, die Erstellung einer künstlichen Speicheldrüse aus körpereigenen Zellen, böte hier ein potentielles Behandlungskonzept.
Diese Studie soll deshalb untersuchen, ob humane Speicheldrüsenepithelzellen (hSEZ) auf einer Matrix aus dezellularisiertem, porzinem Jejunum, der sogenannten Small intestinal submucosa + mucosa (SIS-muc), kultiviert werden können. Können die Zellen innerhalb der Wachstumsperiode wichtige physiologische Differenzierungsmarker beibehalten? Kann die Produktion von α-Amylase, einem der wichtigsten Enzyme des menschlichen Speichels, erhalten werden? Welchen Einfluss hat die Kokultur mit mikrovaskulären Endothelzellen (mvEZ)? Und zuletzt: Ist dezellularisierter Schweinedarm eine potentiell geeignete Matrix für das Tissue Engineering der menschlichen Speicheldrüse?
Zunächst erfolgte die Entnahme von humanem Speicheldrüsengewebe, woraus hSEZ isoliert wurden. Diese wurden dann sowohl in Mono- als auch in Kokultur mit mvEZ auf die SIS-muc aufgebracht und auf dieser kultiviert. Die SIS-muc wurde aus kurzen Schweinedarm-Segmenten gewonnen, die in einem mehrstufigen Verfahren dezellularisiert wurden. Die besiedelte SIS-muc wurde mittels konventioneller sowie Immunfluoreszenzfärbungen, Raster- und Transmissionsektronenmikroskopie (REM/TEM) sowie quantitativer Polymerasekettenreaktion (qPCR) untersucht, darüber hinaus erfolgte die Messung der α-Amylase-Enzymaktivität.
Histologisch sowie in der REM zeigte sich sowohl in der Mono- als auch in der Kokultur eine konfluente Besiedelung der SIS-muc mit hSEZ. In der Kokultur formten mvEZ einen Monolayer auf der serosalen Matrixseite. Bei der Charakterisierung der hSEZ zeigte sich in den Immunfluoreszenzaufnahmen eine starke Ausprägung von Zytokeratin, α-Amylase und Aquaporin-5 und eine moderate Ausprägung von Claudin-1. Bei der Untersuchung der Funktion der α-Amylase konnte in der Kokultur von hSEZ mit mvEZ eine im Gegensatz zur Mono- und 2D-Kultur signifikant erhöhte Enzymaktivität der α-Amylase nachgewiesen werden. In der qPCR-Analyse der α-Amylase-Genexpression war die 3D-Kultur der 2D-Kultur überlegen.
Die vorliegende Arbeit zeigt, dass die Kultur von hSEZ auf der SIS-muc möglich ist. Es konnte nachgewiesen werden, dass die Zellen in 3D-Kultur spezifische Differenzierungsmerkmale beibehalten, die in der 2D-Kultur teils verloren gehen und dass hSEZ in Kokultur mit mvEZ eine gegenüber der Monokultur signifikant erhöhte Produktion von α-Amylase aufweisen. Diese Arbeit liefert die Datengrundlage für zukünftige Studien im dynamischen Bioreaktor-Modell (BioVaSc), die auf dem Weg zur klinischen Translation notwendig sind. Somit stellt sie einen wichtigen Schritt in Richtung einer auf Tissue Engineering basierten Therapie der belastenden Xerostomie dar.
Solitary bees in seasonal environments have to align their life-cycles with favorable environmental conditions and resources. Therefore, a proper timing of their seasonal activity is highly fitness relevant. Most species in temperate environments use temperature as a trigger for the timing of their seasonal activity. Hence, global warming can disrupt mutualistic interactions between solitary bees and plants if increasing temperatures differently change the timing of interaction partners. The objective of this dissertation was to investigate the mechanisms of timing in spring-emerging solitary bees as well as the resulting fitness consequences if temporal mismatches with their host plants should occur. In my experiments, I focused on spring-emerging solitary bees of the genus Osmia and thereby mainly on O. cornuta and O. bicornis (in one study which is presented in Chapter IV, I additionally investigated a third species: O. brevicornis).
Chapter II presents a study in which I investigated different triggers solitary bees are using to time their emergence in spring. In a climate chamber experiment I investigated the relationship between overwintering temperature, body size, body weight and emergence date. In addition, I developed a simple mechanistic model that allowed me to unite my different observations in a consistent framework. In combination with the empirical data, the model strongly suggests that solitary bees follow a strategic approach and emerge at a date that is most profitable for their individual fitness expectations. I have shown that this date is on the one hand temperature dependent as warmer overwintering temperatures increase the weight loss of bees during hibernation, which then advances their optimal emergence date to an earlier time point (due to an earlier benefit from the emergence event). On the other hand I have also shown that the optimal emergence date depends on the individual body size (or body weight) as bees adjust their emergence date accordingly. My data show that it is not enough to solely investigate temperature effects on the timing of bee emergence, but that we should also consider individual body conditions of solitary bees to understand the timing of bee emergence.
In Chapter III, I present a study in which I investigated how exactly temperature determines the emergence date of solitary bees. Therefore, I tested several variants degree-day models to relate temperature time series to emergence data. The basic functioning of such degree-day models is that bees are said to finally emerge when a critical amount of degree-days is accumulated. I showed that bees accumulate degree-days only above a critical temperature value (~4°C in O. cornuta and ~7°C in O. bicornis) and only after the exceedance of a critical calendar date (~10th of March in O. cornuta and ~28th of March in O. bicornis). Such a critical calendar date, before which degree-days are not accumulated irrespective of the actual temperature, is in general less commonly used and, so far, it has only been included twice in a phenology model predicting bee emergence. Furthermore, I used this model to retrospectively predict the emergence dates of bees by applying the model to long-term temperature data which have been recorded by the regional climate station in Würzburg. By doing so, the model estimated that over the last 63 years, bees emerged approximately 4 days earlier.
In Chapter IV, I present a study in which I investigated how temporal mismatches in bee-plant interactions affect the fitness of solitary bees. Therefore, I performed an experiment with large flight cages serving as mesocosms. Inside these mesocosms, I manipulated the supply of blossoms to synchronize or desynchronize bee-plant interactions. In sum, I showed that even short temporal mismatches of three and six days in bee-plant interactions (with solitary bee emergence before flower occurrence) can cause severe fitness losses in solitary bees. Nonetheless, I detected different strategies by solitary bees to counteract impacts on their fitness after temporal mismatches. However, since these strategies may result in secondary fitness costs by a changed sex ratio or increased parasitism, I concluded that compensation strategies do not fully mitigate fitness losses of bees after short temporal mismatches with their food plants. In the event of further climate warming, fitness losses after temporal mismatches may not only exacerbate bee declines but may also reduce pollination services for later-flowering species and affect populations of animal-pollinated plants.
In conclusion, I showed that spring-emerging solitary bees are susceptible to climate change as in response to warmer temperatures bees advance their phenology and show a decreased fitness state. As spring-emerging solitary bees not only consider overwintering temperature but also their individual body condition for adjusting emergence dates, this may explain differing responses to climate warming within and among bee populations which may also have consequences for bee-plant interactions and the persistence of bee populations under further climate warming. If in response to climate warming plants do not shift their phenologies according to the bees, bees may experience temporal mismatches with their host plants. As bees failed to show a single compensation strategy that was entirely successful in mitigating fitness consequences after temporal mismatches with their food plants, the resulting fitness consequences for spring-emerging solitary bees would be severe. Furthermore, I showed that spring-emerging solitary bees use a critical calendar date before which they generally do not commence the summation of degree-days irrespective of the actual temperature. I therefore suggest that further studies should also include the parameter of a critical calendar date into degree-day model predictions to increase the accuracy of model predictions for emergence dates in solitary bees. Although our retrospective prediction about the advance in bee emergence corresponds to the results of several studies on phenological trends of different plant species, we suggest that more research has to be done to assess the impacts of climate warming on the synchronization in bee-plant interactions more accurately.
Ants belong to the most successful insects living on our planet earth. One criterion of their tremendous success is the division of labor among workers that can be related to age (age¬– or temporal polyethism) and/ or body size (size–related polymorphism). Young ants care for the queen and brood in the nest interior and switch to foraging tasks in the outside environment with ongoing age. This highly flexible interior–exterior transition probably allows the ant workers to properly match the colony needs and is one of the most impressive behaviors a single worker undergoes during its life. As environmental stimuli are changing with this transition, workers are required to perform a new behavioral repertoire. This requires significant adaptions in sensory and higher¬–order integration centers in the brain, like the mushroom bodies. Furthermore, foragers need proper time measuring mechanisms to cope with daily environmental changes and to adapt their own mode of life. Therefore, they possess a functional endogenous clock that generates rhythms with a period length of approximately 24 hours. The species–rich genus of Camponotus ants constitute a rewarding model to study how behavioral duties of division of labor were performed and modulated within the colony and how synaptic plasticity in the brain is processed, as they can divide their labor to both, age and body size, simultaneously.
In my PhD thesis, I started to investigate the behavioral repertoire (like foraging and locomotor activity) of two sympatric Camponotus species, C. mus and C. rufipes workers under natural and under controlled conditions. Furthermore, I focused on the division of labor in C. rufipes workers and started to examine structural and ultrastructural changes of neuronal architectures in the brain that are accompanied by the interior–exterior transition of C. rufipes ants.
In the first part of my thesis, I started to analyze the temporal organization of task allocation throughout the life of single C. rufipes workers. Constant video–tracking of individually labeled workers for up to 11 weeks, revealed an age–related division of labor of interior and exterior workers. After emergence, young individuals are tended to by older ones within the first 48 hours of their lives before they themselves start nurturing larvae and pupae. Around 52% switch to foraging duties at an age of 14–20 days. The workers that switched to foraging
tasks are mainly media–sized workers and seem to be more specialized than nurses. Variations in proportion and the age of switching workers between and within different subcolonies indicate how highly flexible and plastic the age–related division of labor occurs in this ant species. Most of the observed workers were engaged in foraging tasks exclusively during nighttime. As the experiments were conducted in the laboratory, they are completely lacking environmental stimuli of the ants´ natural habitat.
I therefore asked in a second study, how workers of the two closely related Camponotus species, C. rufipes and C. mus, adapt their daily activity patterns (foraging and locomotor activity) under natural (in Uruguay, South America) and controlled (in the laboratory) conditions to changing thermal conditions. Monitoring the foraging activity of both Camponotus species in a field experiment revealed, that C. mus workers are exclusively diurnal, whereas C. rufipes foragers are predominantly nocturnal. However, some nests showed an elevated daytime activity, which could be an adaption to seasonally cold night temperatures. To further investigate the impact of temperature and light on the differing foraging activity patterns in the field, workers of both Camponotus species were artificially exposed to different thermal regimes in the laboratory, simulating local winter and summer conditions. Here again, C. mus workers display solely diurnal locomotor activity, whereas workers of C. rufipes shifted their locomotor activity from diurnal under thermal winter conditions to nocturnal under thermal summer conditions. Hence, the combination of both, field work and laboratory studies, shows that daily activity is mostly shaped by thermal conditions and that temperature cycles are not just limiting foraging activity but can be used as zeitgeber to schedule the outside activities of the nests.
Once an individual worker switches from indoor duties to exterior foraging tasks, it is confronted with an entirely new set of sensory information. To cope with changes of the environmental conditions and to facilitate the behavioral switch, workers need a highly flexible and plastic neuronal system. Hence, my thesis further focuses on the underlying neuronal adaptations of the visual system, including the optic lobes as the primary visual neuropil and the mushroom bodies as secondary visual brain neuropil, that are accompanied with the behavioral switch from nursing to foraging. The optic lobes as well as the mushroom bodies of light–deprived workers show an `experience–independent´ volume increase during the first two weeks of adulthood. An additional light exposure for 4 days induces an `experience–dependent´ decrease of synaptic complexes in the mushroom body collar,
followed by an increase after extended light exposure for 14 days. I therefore conclude, that the plasticity of the central visual system represents important components for the optimal timing of the interior–exterior transitions and flexibility of the age–related division of labor. These remarkable structural changes of synaptic complexes suggest an active involvement of the mushroom body neuropil in the lifetime plasticity that promotes the interior–exterior transition of Camponotus rufipes ants. Beside these investigations of neuronal plasticity of synaptic complexes in the mushroom bodies on a structural level, I further started to examine mushroom body synaptic structures at the ultrastructural level. Until recently, the detection of synaptic components in projection neuron axonal boutons were below resolution using classical Transmission Electron Microscopy. Therefore, I started to implement Electron Tomography to increase the synaptic resolution to understand architectural changes in neuronal plasticity process. By acquiring double tilt series and consecutive computation of the acquired tilt information, I am now able to resolve individual clear–core and dense–core vesicles within the projection neuron cytoplasm of C. rufipes ants. I additionally was able to reveal single postsynaptic Kenyon cell dendritic spines (~62) that surround one individual projection neuron bouton. With this, I could reveal first insights into the complex neuronal architecture of single projection neuron boutons in the olfactory mushroom body lip region. The high resolution images of synaptic architectures at the ultrastructural level, received with Electron Tomography would promote the understanding of architectural changes in neuronal plasticity.
In my PhD thesis, I demonstrate that the temporal organization within Camponotus colonies involves the perfect timing of different tasks. Temperature seems to be the most scheduling abiotic factors of foraging and locomotor activity. The ants do not only need to adapt their behavioral repertoire in accordance to the interior–exterior switch, also the parts in the peripheral and central that process visual information need to adapt to the new sensory environment.
I. Timing is a crucial feature in organisms that live within a variable and changing environment. Complex mechanisms to measure time are wide-spread and were shown to exist in many taxa. These mechanisms are expected to provide fitness benefits by enabling organisms to anticipate environmental changes and adapt accordingly. However, very few studies have addressed the adaptive value of proper timing. The objective of this PhD-project was to investigate mechanisms and fitness consequences of timing decisions concerning colony phenology and foraging activity in the honey bee (Apis mellifera), a social insect species with a high degree of social organization and one of the most important pollinators of wild plants and crops. In chapter II, a study is presented that aimed to identify the consequences of disrupted synchrony between colony phenology and the local environment by manipulating the timing of brood onset after hibernation. In a follow-up experiment, the importance of environmental factors for the timing of brood onset was investigated to assess the potential of climate change to disrupt synchronization of colony phenology (Chapter III). Chapter IV aimed to prove for the first time that honey bees can use interval time-place learning to improve foraging activity in a variable environment. Chapter V investigates the fitness benefits of information exchange between nest mates via waggle dance communication about a resource environment that is heterogeneous in space and time.
II. In the study presented in chapter II, the importance of the timing of brood onset after hibernation as critical point in honey bee colony phenology in temperate zones was investigated. Honey bee colonies were overwintered at two climatically different sites. By translocating colonies from each site to the other in late winter, timing of brood onset was manipulated and consequently colony phenology was desynchronized with the local environment. Delaying colony phenology in respect to the local environment decreased the capability of colonies to exploit the abundant spring bloom. Early brood onset, on the other hand, increased the loads of the brood parasite Varroa destructor later in the season with negative impact on colony worker population size. This indicates a timing related trade-off and illustrates the importance of investigating effects of climate change on complex multi-trophic systems. It can be concluded that timing of brood onset in honey bees is an important fitness relevant step for colony phenology that is highly sensitive to climatic conditions in late winter. Further, phenology shifts and mismatches driven by climate change can have severe fitness consequences.
III. In chapter III, I assess the importance of the environmental factors ambient temperature and photoperiod as well as elapsed time on the timing of brood onset. Twenty-four hibernating honey bee colonies were placed into environmental chambers and allocated to different combinations of two temperature regimes and three different light regimes. Brood onset was identified non-invasively by tracking comb temperature within the winter cluster. The experiment revealed that ambient temperature plays a major role in the timing of brood onset, but the response of honey bee colonies to temperature increases is modified by photoperiod. Further, the data indicate the involvement of an internal clock. I conclude that the timing of brood onset is complex but probably highly susceptible to climate change and especially spells of warm weather in winter.
IV. In chapter IV, it was examined if honey bees are capable of interval time-place learning and if this ability improves foraging efficiency in a dynamic resource environment. In a field experiment with artificial feeders, foragers were able to learn time intervals and use this ability to anticipate time periods during which feeders were active. Further, interval time-place learning enabled foragers to increase nectar uptake rates. It was concluded that interval time-place learning can help honey bee foragers to adapt to the complex and variable temporal patterns of floral resource environments.
V. The study presented in chapter V identified the importance of the honey bee waggle dance communication for the spatiotemporal coordination of honey bee foraging activity in resource environments that can vary from day to day. Consequences of disrupting the instructional component of honey bee dance communication were investigated in eight temperate zone landscapes with different levels of spatiotemporal complexity. While nectar uptake of colonies was not affected, waggle dance communication significantly benefitted pollen harvest irrespective of landscape complexity. I suggest that this is explained by the fact that honey bees prefer to forage pollen in semi-natural habitats, which provide diverse resource species but are sparse and presumably hard to find in intensively managed agricultural landscapes. I conclude that waggle dance communication helps to ensure a sufficient and diverse pollen diet which is crucial for honey bee colony health.
VI. In my PhD-project, I could show that honey bee colonies are able to adapt their activities to a seasonally and daily changing environment, which affects resource uptake, colony development, colony health and ultimately colony fitness. Ongoing global change, however, puts timing in honey bee colonies at risk. Climate change has the potential to cause mismatches with the local resource environment. Intensivation of agricultural management with decreased resource diversity and short resource peaks in spring followed by distinctive gaps increases the probability of mismatches. Even the highly efficient foraging system of honey bees might not ensure a sufficiently diverse and healthy diet in such an environment. The global introduction of the parasitic mite V. destructor and the increased exposure to pesticides in intensively managed landscapes further degrades honey bee colony health. This might lead to reduced cognitive capabilities in workers and impact the communication and social organization in colonies, thereby undermining the ability of honey bee colonies to adapt to their environment.
Due to the rotation of the earth in the solar system all inhabitants of our planet are exposed to regular environmental changes since more than 3.5 billion years. In order to anticipate these predictable changes in the environment, evolutionarily conserved biological rhythms have evolved in most organisms – ranging from ancient cyanobacteria up to human beings – and also at different levels of organization – from single cells up to behavior. These rhythms are endogenously generated by so called circadian clocks in our body and entrained to the 24 h cycle by external timing cues. In multi-cellular organisms the majority of the cells in the body is equipped with such an oscillator. In mammals, the circadian system is structured in a hierarchical fashion: A central pacemaker resides in the bilateral suprachiasmatic nucleus (SCN) of the hypothalamus, while subsidiary peripheral clocks exist in nearly every tissue and organ.
In contrast to the aforementioned recurrent environmental changes most organisms are also exposed to unpredictable changes in the environment. In order to adapt to these sudden alterations the acute activation of the stress response system, involving the hypothalamic-pituitary-adrenal (HPA) axis and the sympathetic nervous system, displays a fundamental survival mechanism. However, if activation of the stress system becomes chronic, devastating somatic and affective disorders might be the consequence.
At first glance, the circadian and the stress system seem to represent two separate bodily control systems that are involved in adaptation to predictable and unpredictable stimuli, respectively. However, both systems are fundamental for survival, and thus, communicate with each other at various levels. Early studies already demonstrated that stressor exposure at different times of the diurnal cycle generates different stress effects, whereupon the type of stressor plays a pivotal role. Moreover, alterations in the SCN and peripheral circadian clocks could be shown following stressor exposure.
In cooperation with various co-workers, I investigated whether the stress responsiveness is modulated by the endogenous clock in a diurnal fashion and whether repeated psychosocial stress impacts the circadian clock depending on the time of day of stressor exposure. Therefore, male C57BL/6 mice were repeatedly exposed to a psychosocial stressor, either at the beginning of the inactive/light phase (SDL mice) or active/dark phase (SDD mice).
Subsequently, different behavioral, physiological/endocrine and immunological/ inflammatory consequences were assessed. It could be shown that the effects of repeated psychosocial stressor exposure strongly depend on the time of day of stressor exposure. The present results demonstrate that repeated daily stressor exposure has a more negative outcome when applied during the active/dark phase compared to the inactive/light phase. Stressor exposure during the active phase resulted in a loss of general activity, decreased interest in an unfamiliar conspecific, a shift towards a more pro-inflammatory body milieu, and rhythm disturbances in plasma hormones, all representing well-accepted hallmarks of depression. In contrast, C57BL/6 mice exposed to the stressor in their inactive phase exhibited minor physiological alterations that might prevent the formation of the maladaptive consequences mentioned above, thus representing beneficial adaptations.
The second focus of this thesis was put on the investigation of the effects of repeated psychosocial stressor exposure at different times of the light-dark cycle on various levels of the circadian system. An increased expression of the PERIOD2 (PER2) protein, which represents an essential core clock component, could be found in the SCN of mice repeatedly exposed to the stressor during their active phase. In consistence with the alterations in the central circadian pacemaker, the daily rhythm of different hormones and the activity rhythm were considerably affected by SDD. Mice exposed to the psychosocial stressor in their active phase showed a shifted, or absent, rhythm of the hormones corticosterone and leptin. Moreover, their activity was found to be phase-delayed, which seems to be attributable to the Period (Per) gene since Per1/Per2 double-mutants still exhibited their normal activity rhythm following 19 days of stressor exposure during the active phase. In contrast, a phase-advance in the peripheral adrenal gland clock could be seen in C57BL/6 mice subjected to the stressor during their inactive phase. This phase-shift might be required for maintaining the normal rhythmicity in hormonal release and activity.
It has previously been suggested that activation of the HPA axis upon stressor exposure at different times of the light-dark cycle is depending on whether the stressor is of physical or psychological nature. Data from the HPA axis analysis now refine previous findings, indicating that psychosocial stressors also modulate HPA axis responses based on the time of day of stressor presentation. The present results demonstrate that HPA axis activity was reduced following repeated stressor exposure during the active phase. It is reasonable to speculate that this reduced basal activity of the stress system represents a failure in HPA axis adjustment, which could contribute to the negative consequences of repeated psychosocial stressor exposure during the dark phase.
Taken together, it can be concluded that the endogenous clock in mice modulates the stress responsiveness in a circadian fashion and that repeated psychosocial stressor exposure affects the biological clock depending on the time of day of stressor presentation. Thereby, stressor exposure during the active phase results in a more negative outcome as compared to stressor experience during the inactive phase. It is assumed that the interaction between the circadian clock and the stress system is a complex issue that might ensure that the endogenous clock does not get out of synchrony in any order.
In several countries, a decline in mortality, case-fatality and recurrence rates of stroke was observed. However, studies investigating sex-specific and subtype-specific (pathological and etiological) time trends in stroke mortality, case-fatality and recurrence rates are scarce, especially in Germany. The decline in ischemic stroke mortality and case-fatality might be associated with the high quality of acute care of ischemic stroke, but the exact determinants of early outcome remains unknown for Germany.
Therefore, as first step of this thesis, we investigated the time trends of subtype- and sex-specific age- standardized stroke mortality rates in Germany from 1998 to 2015, by applying joinpoint regression on official causes of death statistics, provided by the Federal Statistical Office. Furthermore, a regional comparison of the time trends in stroke mortality between East and West was conducted. In the second step, time trends in case-fatality and stroke recurrence rates were analyzed using data from a population- based stroke register in Germany between 1996 and 2015. The analysis was stratified by sex and etiological subtype of ischemic stroke. In the third step, quality of stroke care and the association between adherence to measures of quality of acute ischemic stroke care and in-hospital mortality was estimated based on data from nine regional hospital-based stroke registers in Germany from the years 2015 and 2016.
We showed that in Germany, age-standardized stroke mortality declined by over 50% from 1998 to 2015 both, in women and men. Stratified by the pathological subtypes of stroke, the decrease in mortality was larger in ischemic stroke compared to hemorrhagic stroke. Different patterns in the time trends of stroke were observed for stroke subtypes, regions in Germany (former Eastern part of Germany (EG), former Western part of Germany (WG)) and sex, but in all strata a decline was found. By applying joinpoint regression, the number of changes in time trend differed between the regions and up to three changes in the trend in ischemic stroke mortality were detected. Trends in hemorrhagic stroke were in parallel between the regions with up to one change (in women) in joinpoint regression. Comparing the regions, stroke mortality was higher in EG compared to WG throughout the whole observed time period, however the differences between the regions started to diminish from 2007 onwards.
Further it was found that, based on the population-based Erlangen Stroke Project (ESPro), case-fatality and recurrence rates in ischemic stroke patients are still high in Germany. 46% died and 20% got a recurrent stroke within the first five years after stroke. Case-fatality rates declined statistically significant from 1996 to 2015 across all ischemic stroke patients and all etiological subtypes of ischemic stroke. Based on Cox regression no statistically significant decrease in stroke recurrence was observed.
Based on the pooled data of nine regional hospital-based stroke registers from the years 2015 and 2016 covering about 80% of all hospitalized stroke patients in Germany, a high quality of care of acute ischemic stroke patients, measured via 11 evidence-based quality indicators (QI) of process of care, was observed. Across all registers, most QI reached the predefined target values for good quality of stroke care. 9 out of 11 QI showed a significant association with 7-day in-hospital mortality. An inverse linear association between overall adherence to QI and 7-day in-hospital mortality was observed.
In conclusion, stroke mortality and case-fatality showed a favorable development over time in Germany, which might partly be due to improvements in acute treatment. This is supported by the association between overall adherence to quality of care and in-hospital mortality. However, there might be room for improvements in long-term secondary prevention, as no clear reduction in recurrence rates was observed.
Sepsis ist eine dysregulierte Reaktion des Organismus auf eine Infektion. Bei Sepsis werden oft Blutungs- und Thromboseereignisse beobachtet, welche in einer Disseminierten Intravasalen Gerinnung (DIG) gipfeln können. Thrombozyten sind die Schlüsselzellen von Thrombose und Hämostase. Bei Sepsis und DIG kommt es häufig zu einem Abfall der Thrombozytenzahl, doch Blutungs- und Thromboseereignisse können unabhängig von der Thrombozytenzahl auftreten, was zusätzlich eine Veränderung der Thrombozytenfunktion nahelegt.
In dieser Arbeit wurde deshalb die Thrombozytenfunktion bei 15 Patienten mit Sepsis zu drei Zeitpunkten im Krankheitsverlauf untersucht. Es konnte bei unauffälliger Rezeptorexpression keine Voraktivierung der Thrombozyten mittels Durchflusszytometrie festgestellt werden. Jedoch war die Aktivierung nach Stimulation mit multiplen Agonisten signifikant reduziert. Besonders ausgeprägt war die Hyporeaktivität bei Stimulation des Kollagen-Rezeptors GPVI mit dem Agonisten CRP-XL. Es wurde gezeigt, dass nach GPVI-Stimulation eine reduzierte Phosphorylierung der nachgeschalteten Proteine Syk und LAT im Vergleich zum Gesundspender induziert wird. In Kreuzinkubationsexperimenten hatte die (Co )Inkubation von Thrombozyten in Plasma von Sepsispatienten oder mit Bakterienisolaten aus Sepsis-Blutkulturen keinen Effekt auf die Thrombozytenreaktivität. Allerdings konnte durch Sepsis-Vollblut eine signifikante GPVI-Hyporeaktivität in Thrombozyten von gesunden Probanden induziert werden, was einen zellulären Mediator als Ursache des Defekts nahelegt. In dieser Arbeit wurde gezeigt, dass insbesondere die GPVI-Signalkaskade bei Sepsis massiv beeinträchtigt ist. Der Immunorezeptor GPVI ist ein vielversprechendes Zielmolekül, um die Pathogenese der Sepsis, des Capillary Leak und die immunregulatorische Rolle von Thrombozyten besser zu verstehen. Die GPVI-Hyporeaktivität könnte als zukünftiger Biomarker für die Sepsis-Frühdiagnose genutzt werden.