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Institute
- Graduate School of Life Sciences (1034)
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- Julius-von-Sachs-Institut für Biowissenschaften (25)
Sonstige beteiligte Institutionen
- Helmholtz Institute for RNA-based Infection Research (HIRI) (7)
- Universitätsklinikum Münster (3)
- Rudolf Virchow Center for Integrative and Translational Bioimaging, University of Würzburg (2)
- Zentrum für Infektionsforschung (ZINF) Würzburg (2)
- 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)
Bei der Multiplen Sklerose (MS) handelt es sich um eine Autoimmunerkrankung des zentralen Nervensystems (ZNS). Abhängig von der betroffenen ZNS-Region kann es zu vielfältigen Symptomen kommen. Neben neurologischen Symptomen verursacht durch ZNS-Läsionen leidet ein Großteil der MS-Patienten auch unter gastrointestinalen Funktionsstörungen. Diese gastrointestinalen Symptome wurden bisher eher auf Läsionen im Rückenmark zurückgeführt und nicht direkt in Verbindung mit der autoimmunen Ätiologie der Erkrankung gebracht.
In dieser Studie wurde das enterische Nervensystem (ENS) in einem B-Zell- und Antikörper-abhängigen Mausmodell der MS untersucht. Dafür wurde der Autoimmunprozess durch Immunisierung mit MP4, einem Fusionsprotein aus dem Myelin-Basischen-Protein (MBP) und dem Proteolipid-Protein (PLP), ausgelöst. Das ZNS und ENS wurden in den unterschiedlichen Erkrankungsstadien immunhistochemisch und elektronenmikroskopisch analysiert. Neben der Immunpathologie des ZNS konnte dabei eine Degeneration des ENS schon vor dem Einsetzen der ersten neurologischen Defizite nachgewiesen werden. Die ENS-Pathologie war antikörper-mediiert und ging einher mit einer verringerten gastrointestinalen Motilität sowie mit einer Gliose und Neurodegeneration des ENS.
Mithilfe von Immunpräzipitation und Massenspektrometrie konnten im ENS vier mögliche Zielstrukturen des Autoimmunprozesses identifiziert werden, was auf sog. epitope spreading hindeutet. Auch im Plasma von MS-Patienten konnten Antikörper gegen drei dieser Antigene nachgewiesen werden. Des Weiteren zeigten sich in Kolon-Resektaten von MS-Patienten erste Ansätze einer Neurodegeneration und Gliose des ENS.
In dieser Studie wurde zum ersten Mal ein direkter Zusammenhang zwischen der Autoimmunreaktion gegen das ZNS und einer simultanen Reaktion gegen das ENS gezeigt. Dies kann einen Paradigmenwechsel im Verständnis der Immunpathogenese der MS anstoßen und neue therapeutische und diagnostische Ansätze initiieren.
Non-steroidal antiinflammatory drugs are most commonly used for inflammatory and postoperative pain. But they lack effectiveness and specificity, leading to severe side effects, like gastric ulcers, asthma and severe bleeding. Oxidized 1-palmitoyl-2-arachinidonoyl-sn-glycero-3-phosphocholine (OxPAPC) plays an important role in inflammatory pain. PAPC is a common phosphatidylcholine of membranes, which can be oxidized by reactive oxygen species. In preliminary experiments, our group found that local injection of OxPAPC in rat paws induces hyperalgesia.
In this study we examined the effect of OxPAPC on transient receptor potential A1 (TRPA1), an ion channel expressed in C-fiber neurons. Furthermore, we investigated if intracellular cysteine residues of TRPA1 were necessary for agonist-channel-interactions and if a subsequent TRPA1 activation could be prevented by OxPAPC scavengers.
To answer these questions, we performed calcium imaging using HEK-293 cells stably expressing hTRPA1, or transiently expressing the triple mutant channel hTRPA1-3C and naïve DRG neurons. Cells were incubated with the ratiometric, fluorescent dye Fura-2/AM and stimulated with OxPAPC. The change of light emission after excitation with 340 and 380 nm wavelengths allowed conclusions regarding changes of intracellular calcium concentrations after TRPA1 activation.
In our investigation we proved evidence that OxPAPC activates TRPA1, which caused a flow of calcium ions into the cytoplasm. The TRPA1-specific channel blocker HC-030031 eliminated this agonist-induced response. TRPA1-3C was not completely sensitive to OxPAPC. The peptide D-4F and the monoclonal antibody E06 neutralized OxPAPC-induced TRPA1 activation.
In this work, the importance of OxPAPC as a key mediator of inflammatory pain and as a promising target for drug design is highlighted. Our results indicate that TRPA1 activation by OxPAPC involves cysteine-dependent mechanisms, but there are other, cysteine-independent activation mechanisms as well. Potential pharmaceuticals for the treatment of inflammatory pain are D-4F and E06, whose efficiency has recently been confirmed in the animal model by our research group.
Chronic Kidney Disease as an Important Co-morbid Condition in Coronary Heart Disease Patients
(2019)
In patients with coronary heart disease (CHD) the control of the modifiable “traditional” cardiovascular risk factors such as hypertension, dyslipidemia, diabetes, achieving/maintaining normal body weight and smoking cessation is of major importance to improve prognosis. Guideline recommendations for secondary CHD prevention include specific treatment targets for blood pressure, lipid levels, and markers of glucose metabolism for both younger and older patients. Chronic kidney disease (CKD) has been identified as a “non-traditional” risk factor for worse outcome in CHD patients, as it is associated with a markedly increased risk for subsequent CV events and mortality.
The specific objectives of the current thesis-project are to investigate (a) the quality of care in a recent sample of German CHD patients and to investigate variation of risk factor control between younger and elder patients (≤70 versus >70 years), (b) to analyze the prevalence of CKD across Europe in stable CHD patients in the outpatient setting and during a hospital stay for CHD, (c) to investigate the level of awareness of CKD in German CHD patients and their treating physicians.
Data from the European-wide EUROASPIRE IV study were used that include data on 7998 CHD patients in the ambulatory setting (study visit) and during a hospital stay for CHD (index). The German EUROASPIRE IV study center in Würzburg recruited 536 patients in 2012-2013. Risk factor control was compared against the current recommendations of the European Society of Cardiology. CKD was described by stages of glomerular filtration rate (eGFR) and albuminuria. German patients were asked in an additional kidney specific module whether they have ever been told by a physician about renal impairment. The fact that CKD or acute kidney injury (AKI) was mentioned in prominent parts of the hospital discharge letter as well as correct ICD-coding of CKD or AKI served as a proxy for physician’s awareness of CKD.
The majority of German CHD patients was treated with the recommended drug therapies including e.g. β-blockers, anti-platelets and statins. However, treatment targets for blood pressure and LDL-cholesterol levels were not achieved in many patients (45% and 53%, respectively) and glycemic control in diabetic CHD patients with HbA1-levels <7% was insufficient (61%). A minority of patients reported on current smoking (10%), but unhealthy life-styles e.g. overweight/obesity (85%/37%) were frequent. Patterns of care differed between younger and older CHD patients while older patients were less likely to receive the recommended medical CHD-therapy, were more likely to have uncontrolled blood pressure and also to be diabetic. However, a greater proportion of diabetic patients >70 years was achieving the HbA1c target, and less elder patients were current smokers or were obese. About 17% of patients on average had CKD (eGFR< 60 ml/min/1.73m²) in the entire European sample at the study visit, and an additional 10% had albuminuria despite preserved eGFR, with considerable variation among countries. Impaired kidney function was observed in every fifth patient admitted for CHD in the entire European dataset of the EUROASPIRE IV study. Of the German CHD patients with CKD at the study visit, only a third were aware of their renal impairment. A minority of these patients was being seen by nephrologists, however, with a higher likelihood of CKD awareness and specialist care in more advanced stages of CKD. About a third of patients admitted for CHD showed either CKD or AKI during the hospital stay, but the discharge letter mentioned chronic or acute kidney disease only in every fifth of these patients. In contrast, correct ICD coding of CKD or AKI was more complete, but still suboptimal.
In summary, quality of secondary prevention in German CHD patients indicates considerably room for improvement, with life-style modifications may become an even greater factor in prevention campaigns than medical treatment into certain target ranges. Preventive therapies should also consider different needs in older individuals acknowledging physical and mental potential, other comorbidities and drug-interactions with co-medication. CKD is common in CHD patients, not only in the elderly. Since CHD and CKD affect each other and impact on worse prognosis of each other, raising the awareness of CKD among patients and physicians and considering CKD in medical therapy may improve prognosis and slow disease progression of CHD as well as CKD.
Ovarian cancer is one of the most common gynecological malignancies in the world. The prevalence of a microbial signature in ovarian cancer has been reported by several studies till date. In these microorganisms, Human herpesvirus 6 (HHV-6) and Chlamydia trachomatis (C.tr) are especially important as they have significantly high prevalence rate. Moreover, these pathogens are directly involved in causing DNA damage and thereby disrupting the integrity of host genome which is the underlying cause of any cancer. This study focuses on how the two pathogens, HHV-6 and C. trachomatis can affect the genome integrity in their individual capacities and thereby may drive ovarian epithelial cells towards transformation. HHV-6 has unique tendency to integrate its genome into the host genome at subtelomeric regions and achieve a state of latency. This latent virus may get reactivated during the course of life by stress, drugs such as steroids, during transplantation, pregnancy etc. The study presented here began with an interesting observation wherein the direct repeat (DR) sequences flanking the ends of double stranded viral genome were found in unusually high numbers in human blood samples as opposed to normal ratio of two DR copies per viral genome. This study was corroborated with in vitro data where cell lines were generated to mimic the HHV-6 status in human samples. The same observation of unusually high DR copies was found in these cell lines as well. Interestingly, fluorescence in situ hybridization (FISH) and inverse polymerase chain reaction followed by southern blotting showed that DR sequences were found to be integrated in nontelomeric regions as opposed to the usual sub-telomeric integration sites in both human samples and in cell lines. Sanger sequencing confirmed the non-telomeric integration of viral DR sequences in the host genome. Several studies have shown that C. trachomatis causes DNA damage and inhibits the signaling cascade of DNA damage response. However, the effect of C. trachomatis infection on process of DNA repair itself was not addressed. In this study, the effect of C. trachomatis infection on host base excision repair (BER) has been addressed. Base excision repair is a pathway which is responsible for replacing the oxidized bases with new undamaged ones. Interestingly, it was found that C. trachomatis infection downregulated polymerase β expression and attenuated polymerase β- mediated BER in vitro. The mechanism of the polymerase β downregulation was found to be associated with the changes in the host microRNAs and downregulation of tumor suppressor, p53. MicroRNA-499 which has a binding site in the polymerase β 3’UTR was shown to be upregulated during C. trachomatis infection. Inhibition of miR-499 using synthetic miR-499 inhibitor indeed improved the repair efficiency during C. trachomatis infection in the in vitro repair assay. Moreover, p53 transcriptionally regulates polymerase β and stabilizing p53 during C. trachomatis infection enhanced the repair efficiency. Previous studies have shown that C. trachomatis can reactivate latent HHV-6. Therefore, genomic instability due to insertions of unstable ‘transposon-like’ HHV-6 DR followed by compromised BER during C. trachomatis infection cumulatively support the hypothesis of pathogenic infections as a probable cause of ovarian cancer
Unterschiede in Frontaler Kortex Oxygenierung in zweierlei Risikogruppen der Alzheimer Demenz
(2019)
Die verbesserte medizinische Versorgung führt zu einer zunehmenden Lebenserwartung unserer Gesellschaft. Damit steigt auch die sozioökonomische Relevanz neurodegenerativer Erkrankungen kontinuierlich. Für die Alzheimer Demenz (AD), die dabei die häufigste Ursache darstellt, stehen bisher keine krankheitsmodifizierenden Behandlungsoptionen zur Verfügung. Die lange präklinische Phase der Erkrankung birgt jedoch großes Potential für die Entwicklung neuer Behandlungsoptionen. Das Untersuchen von Risikogruppen ist für die Identifikation von Prädiktoren einer späteren AD Manifestation von besonderem Interesse. In diesem Zusammenhang werden insbesondere das Vorliegen genetischer Risikokonstellationen, wie dem Apolipoprotein E (APOE) Ɛ4-Allel, sowie kognitiver Risikofaktoren, wie der „leichten kognitiven Beeinträchtigung“ (MCI), diskutiert. Die Identifikation präklinischer Aktivierungsunterschiede in relevanten Gehirnregionen von Risikogruppen kann als Basis für die Entwicklung neurofunktioneller Früherkennungs-Marker dienen. Der präfrontale Kortex (PFC), welcher mit der Steuerung von Exekutivfunktionen assoziiert wird, hat sich in diesem Zusammenhang in bisherigen Studien als eine relevante Schlüsselregion manifestiert. Aufgrund der aufwendigen und kostenintensiven bildgebenden Untersuchungsmethoden, sind die genauen Prozesse jedoch noch unklar.
Ziel der vorliegenden Arbeit war es daher, Unterschiede in der PFC Oxygenierung in zweierlei Risikogruppen der AD mit einer kostengünstigeren Bildgebungsmethode, der funktionellen Nahinfrarot Spektroskopie (fNIRS), zu untersuchen. Dafür wurde in einem ersten Schritt, der Trailmaking Test (TMT), ein weitverbreiteter neuropsychologischer Test zur Erfassung exekutiver Funktionen, für fNIRS implementiert. Als Grundlage für die Untersuchung frühpathologischer Prozesse, wurden zunächst gesunde Alterungsprozesse betrachtet. Der Vergleich von jungen und älteren Probanden (n = 20 pro Gruppe) wies neben der Eignung der Testimplementierung für fNIRS auf eine spezifische bilaterale PFC Oxygenierung hin, welche bei jungen Probanden rechtshemisphärisch lateralisiert war. Ältere Probanden hingegen zeigten bei vergleichbaren Verhaltensdaten insgesamt mehr signifikante Kanäle sowie eine Abnahme der Lateralisierung. Dies kann als zusätzlicher Bedarf an Ressourcen in gesunden Alterungsprozessen interpretiert werden.
Im Rahmen der Hauptstudie wurden anschließend insgesamt 604 ältere Probanden im Alter von 70 bis 76 Jahren untersucht. Zunächst wurde die genetische Risikogruppe der Ɛ4-Allel-Träger (n = 78) mit den neutralen Ɛ3-Allel-Trägern (n = 216) und den Trägern des als protektiv geltenden Ɛ2-Allels (n = 50) verglichen. Hierbei zeigte sich eine geringere Oxygenierung der Risikogruppe bei geringer Aufgabenschwierigkeit, während sich ein erhöhter Oxygenierungsanstieg im medialen PFC mit steigender Aufgabenschwierigkeit zeigte. Dies deutet auf einen erhöhten Bedarf an neuronalen Kontrollmechanismen der Risikogruppe zur Bewältigung der steigenden Aufgabenschwierigkeit hin. Die protektive Gruppe zeigte hingegen eine erhöhte Oxygenierung im ventralen PFC mit steigender Aufgabenschwierigkeit, was möglicherweise auf einen präventiven Effekt hindeuten könnte.
Weiterführend wurden MCI-Patienten mit gesunden Probanden (n = 57 pro Gruppe) hinsichtlich des kognitiven Risikofaktors verglichen. Hierbei zeigte sich ein punktuell reduzierter Oxygenierunganstieg der MCI Patienten mit steigender Aufgabenschwierigkeit vor allem im ventralen PFC bei ebenfalls stabiler Verhaltensleistung. Die gefundene Reduktion könnte ein Zeichen für eine aufgebrauchte kognitive Reserve sein, welche Einbußen auf Verhaltensebene voranzugehen scheint.
Diese charakteristischen Unterschiede in den frontalen Oxygenierungsmustern von Risikogruppen (APOE, MCI) könnten als Biomarker zur Früherkennung von AD noch vor dem Auftreten kognitiver Einbußen dienen. Die fNIRS-Untersuchung während der Durchführung des TMT hat sich in diesem Zusammenhang als potentielles Instrument zur Frühdiagnose der präklinischen Phase der AD als geeignet erwiesen. Die Ergebnisse werden unter Einbezug des wissenschaftlichen Kontexts interpretiert und Implikationen für weitere notwendige Studien sowie die klinische Anwendbarkeit diskutiert.
All living organisms need timekeeping mechanisms to track and anticipate cyclic changes in their environment. The ability to prepare for and respond to daily and seasonal changes is endowed by circadian clocks. The systemic features and molecular mechanisms that drive circadian rhythmicity are highly conserved across kingdoms. Therefore, Drosophila melanogaster with its relatively small brain (ca. 135.000 neurons) and the outstanding genetic tools that are available, is a perfect model to investigate the properties and relevance of the circadian system in a complex, but yet comprehensible organism.
The last 50 years of chronobiological research in the fruit fly resulted in a deep understanding of the molecular machinery that drives circadian rhythmicity, and various histological studies revealed the neural substrate of the circadian system. However, a detailed neuroanatomical and physiological description on the single-cell level has still to be acquired. Thus, I employed a multicolor labeling approach to characterize the clock network of Drosophila melanogaster with single-cell resolution and additionally investigated the putative in- and output sites of selected neurons.
To further study the functional hierarchy within the clock network and to monitor the “ticking clock“ over the course of several circadian cycles, I established a method, which allows us to follow the accumulation and degradation of the core clock genes in living brain explants by the means of bioluminescence imaging of single-cells.
Das humane Schädeldach besteht aus fünf Schädelplatten, die durch intramembranöse Ossifikation entstehen. Wenn diese in der Embryonalentwicklung aufeinandertreffen, bilden sich Schädelnähte aus, die eine Fusion der Schädelplatten verhindern und damit ein Schädelwachstum parallel zu Gehirnentwicklung ermöglichen. Für diesen Prozess ist eine Balance aus Zellproliferation und Differenzierung nötig, deren Aufrechterhaltung wiederum durch eine komplexe Regulation von verschiedenen Signalwegen gewährleistet wird. Störungen in diesem regulatorischen System können zu einer vorzeitigen Fusion der Schädelplatten, Kraniosynostose genannt, führen. Die Kraniosynostose ist eine der häufigsten kraniofazialen Fehlbildungen beim Menschen. Durch kompensatorisches Wachstum an den nicht fusionierten Suturen entstehen charakteristische Schädeldeformationen, die sekundär einen erhöhten intrakranialen Druck zur Folge haben können. Eine vorzeitige Fusion der Suturen kann sowohl isoliert als auch syndromal zusammen mit weiteren klinischen Auffälligkeiten vorliegen. Bisher sind über 150 verschiedene Kraniosynostose Syndrome beschrieben und insgesamt 25-30% aller Kraniosynostose Patienten sind von einer syndromalen Form betroffen. Da die klinischen Merkmale der Kraniosynostose Syndrome variabel sind und zum Teil überlappen, ist eine klare klinische Diagnose häufig erschwert. Sowohl Umwelteinflüsse als auch genetische Veränderungen können die Ursache für Kraniosynostosen sein. Vor allem bei syndromalen Kraniosynostosen wurden genetische Veränderungen, wie beispielsweise Mutationen in den Genen FGFR2, FGFR3, TWIST1 und EFNB1, identifiziert. Darüber hinaus wurden chromosomale Veränderungen wie partielle Monosomien von 7p, 9p oder 11p sowie partielle Trisomien von 5q, 13q oder 15q mit Kraniosynostose assoziiert. Trotzdem ist in über 50% der Fälle die genetische Ursache unbekannt und die Pathogenese von Kraniosynostosen noch nicht vollständig geklärt.
Ziel dieser Arbeit war es neue genetische Ursachen bei Kraniosynostose Patienten zu identifizieren und so zur Aufklärung der Pathogenese beizutragen. Es wurde die genomische DNA von 83 Patienten molekulargenetisch durch Mikroarray basierte vergleichende Genomhybridisierung (Array-CGH) oder durch ein speziell entworfenes Next Generation Sequencing (NGS) Genpanel untersucht. Bei 30% der Patienten konnte eine potentiell pathogene Veränderung identifiziert werden. Davon waren 23% chromosomale Aberrationen wie unbalancierte Translokationen, isolierte interstitielle Verluste und ein Zugewinn an genomischen Material. Bei zwei Patienten wurden unbalancierte Translokationen mit partieller 5q Trisomie nachgewiesen. Das Gen MSX2 liegt innerhalb des duplizierten Bereichs, sodass möglicherweise eine MSX2 Überexpression vorliegt. Für ein normales Schädelwachstum ist jedoch die richtige Menge an MSX2 kritisch. Des Weiteren wurde eine partielle Deletion von TCF12 detektiert, die in einer Haploinsuffizienz von TCF12 resultiert. TCF12 Mutationen sind mit Koronarnahtsynosten assoziiert. In einem anderen Fall lag das Gen FGF10 innerhalb der duplizierten 5p15.1-p12 Region. Das Gen kodiert für einen Liganden des FGF Signalwegs und wurde bisher noch nicht mit Kraniosynostose assoziiert. Aufgrund dessen wurden Analysen im Tiermodell Danio rerio durchgeführt. Eine simulierte Überexpression durch Injektion der fgf10a mRNA in das 1-Zell Stadium führte zu schweren Gehirn-, Herz- und Augendefekten.
Mittels NGS wurden 77% der potentiell pathogenen genetischen Veränderungen identifiziert. Hierfür wurde in dieser Arbeit ein Genpanel erstellt, das 68 Gene umfasst. Es wurden sowohl bekannte Kraniosynostose- als auch Kandidaten-Gene sowie Gene, die mit der Ossifikation assoziiert sind, in die Analyse eingeschlossen. Das Genpanel wurde durch die Sequenzierung von fünf Kontrollproben mit bekannten Mutationen erfolgreich validiert. Anschließend wurde die genomische DNA von 66 Patienten analysiert. Es konnten 20 (potentiell) pathogene Varianten identifiziert werden. Neben bereits bekannten Mutationen in den Genen FGFR1, FGFR2, FGFR3 und TWIST1, konnten zusätzlich 8 neue, potentiell pathogene Varianten in den Genen ERF, MEGF8, MSX2, PTCH1 und TCF12 identifiziert werden. Die Ergebnisse dieser Arbeit tragen dazu bei das Mutationsspektrum dieser Gene zu erweitern. Bei zwei der Varianten handelte es sich um potentielle Spleißvarianten. Für diese konnte in einem in vitro Spleißsystem gezeigt werden, dass sie eine Änderung des Spleißmusters bewirken. Der Nachweis von zwei seltenen Varianten in den Genen FGFR2 und HUWE1 hat außerdem dazu beigetragen die Pathogenität dieser spezifischen Varianten zu bekräftigen. Eine Variante in POR, die aufgrund bioinformatischer Analysen als potentiell pathogen bewertet wurde, wurde nach der Segregationsanalyse als wahrscheinlich benigne eingestuft. Zusammenfassend konnten bei etwa einem Drittel der Patienten, die mit dem NGS Genpanel analysiert wurden, eine genetische Ursache identifiziert werden. Dieses Genpanel stellt somit ein effizientes diagnostisches Tool dar, das zukünftig in der genetischen Routine-Diagnostik von Kraniosynostose-Patienten eingesetzt werden kann. Die Ergebnisse dieser Arbeit zeigen, dass sowohl eine Untersuchung auf CNVs als auch auf Sequenzänderungen bei Kraniosynostose Patienten sinnvoll ist.
An efficient foraging strategy is one of the most important traits for the fitness of animals. The theory of optimal foraging tries to predict foraging behaviour through the overarching question: how animals should forage so as to minimize costs while maximizing profits? Social insects, having occupied nearly every natural niche through widely different strategies, offer themselves as an ideal group to study how well optimal foraging theory can explain their behaviour and success.
Specialization often leads to unique adaptations in morphology and behaviour. I therefore decided to investigate the behaviour of Megaponera analis. This ponerine ant species is specialized on hunting only termites of the subfamily Macrotermitinae at their foraging sites. Their foraging behaviour is regulated by a handful of individual scouts (10-20) that search for termite foraging sites before returning to the nest to recruit a large number of nestmates (200-500 ants). These ants then follow the scout in a column formation to the termites and after the hunt return together to the nest, these raids occur two to five times per day.
Predators of highly defensive prey likely develop cost reducing adaptations. The evolutionary arms race between termites and ants led to various defensive mechanisms in termites, e.g. a caste specialized in fighting predators. As M. analis incurs high injury/mortality risks when preying on termites, some risk mitigating adaptations have evolved. I show that a unique rescue behaviour in M. analis, consisting of injured nestmates being carried back to the nest, reduces combat mortality. These injured ants “call for help” with pheromones present in their mandibular gland reservoirs. A model accounting for this rescue behaviour identifies the drivers favouring its evolution and estimates that rescuing allows for maintaining a 29% larger colony size. Heavily injured ants that lost too many legs during the fight on the other hand are not helped. Interestingly, this was regulated not by the helper but by the uncooperativeness of the injured ant. I further observed treatment of the injury by nestmates inside the nest through intense allogrooming directly at the wound. Lack of treatment increased mortality from 10% to 80% within 24 hours, with the cause of death most likely being infections.
Collective decision-making is one of the main mechanisms in social insects through which foraging is regulated. However, individual decision-making can also play an important role, depending on the type of foraging behaviour. In M. analis only a handful of individuals (the scouts) hold all the valuable information about foraging sites. I therefore looked at predictions made by optimal foraging theory to better understand the interplay between collective and individual decision-making in this obligate group-raiding predator. I found a clear positive relation between raid size and termite abundance at the foraging site. Furthermore, selectivity of the food source increased with distance. The confirmation of optimal foraging theory suggests that individual scouts must be the main driver behind raid size, choice and raiding behaviour. Therefore most central place foraging behaviours in M. analis were not achieved by collective decisions but rather by individual decisions of scout ants. Thus, 1% of the colony (10–20 scouts) decided the fate and foraging efficiency of the remaining 99%.
Division of labour is one of the main reasons for the success of social insects. Worker polymorphism, age polyethism and work division in more primitive ants, like the ponerines, remain mostly unexplored though. Since M. analis specializes on a defensive prey, adaptations to reduce their foraging costs can be expected. I found that the work division, task allocation and column-formation during the hunt were much more sophisticated than was previously thought. The column-formation was remarkably stable, with the same ants resuming similar positions in subsequent raids and front ants even returning to their positions if displaced in the same raid. Most of the raid tasks were not executed by predetermined members of the raid but were filled out as need arose during the hunt, with a clear preference for larger ants to conduct most tasks.
I show that specialization towards a highly defensive prey can lead to very unique adaptations in the foraging behaviour of a species. I explored experimentally the adaptive value of rescue behaviour focused on injured nestmates in social insects. This was not only limited to selective rescuing of lightly injured individuals by carrying them back (thus reducing predation risk) but moreover includes a differentiated treatment inside the nest. These observations will help to improve our understanding of the evolution of rescue behaviour in animals. I further show that most optimal foraging predictions are fulfilled and regulated by a handful of individuals in M. analis. Lastly, I propose that the continuous allometric size polymorphism in M. analis allows for greater flexibility in task allocation, necessary due to the unpredictability of task requirements in an irregular system such as hunting termites in groups. All of my observations help to further understand how a group-hunting predator should forage so as to minimize costs while maximizing profits.
Mammalian haloacid dehalogenase (HAD)-type phosphatases are a large and ubiquitous family of at least 40 human members. Many of them have important physiological functions, such as the regulation of intermediary metabolism and the modulation of enzyme activities, yet they are also linked to diseases such as cardiovascular or metabolic disorders and cancer.
Still, most of the mammalian HAD phosphatases remain functionally uncharacterized.
This thesis reveals novel cell biological and physiological functions of the phosphoglycolate phosphatase PGP, also referred to as AUM. To this end, PGP was functionally characterized by performing analyses using purified recombinant proteins to investigate potential protein substrates of PGP, cell biological studies using the spermatogonial cell line GC1, primary mouse lung endothelial cells and lymphocytes, and a range of biochemical techniques to characterize Pgp-deficient mouse embryos.
To characterize the cell biological functions of PGP, its role downstream of RTK- and integrin signaling in the regulation of cell migration was investigated. It was shown that PGP inactivation elevates integrin- and RTK-induced circular dorsal ruffle (CDR) formation, cell spreading and cell migration. Furthermore, PGP was identified as a negative regulator of directed lymphocyte migration upon integrin- and GPCR activation.
The underlying mechanisms were analyzed further. It was demonstrated that PGP regulates CDR formation and cell migration in a PLC- and PKC-dependent manner, and that Src family kinase activities are required for the observed cellular effects. Upon integrin- and RTK activation, phosphorylation levels of tyrosine residues 1068 and 1173 of the EGF receptor were elevated and PLCγ1 was hyper-activated in PGP-deficient cells. Additionally, PGP-inactivated lymphocytes displayed elevated PKC activity, and PKC-mediated cytoskeletal remodeling was accelerated upon loss of PGP activity. Untargeted lipidomic analyses revealed that the membrane lipid phosphatidylserine (PS) was highly upregulated in PGP-depleted cells.
These data are consistent with the hypothesis that the accumulation of PS in the plasma membrane leads to a pre-assembly of signaling molecules such as PLCγ1 or PKCs that couple the activation of integrins, EGF receptors and GPCRs to accelerated cytoskeletal remodeling.
Thus, this thesis shows that PGP can affect cell spreading and cell migration by acting as a PG-directed phosphatase.
To understand the physiological functions of PGP, conditionally PGP-inactivated mice were analyzed. Whole-body PGP inactivation led to an intrauterine growth defect with developmental delay after E8.5, resulting in a gradual deterioration and death of PgpDN/DN embryos between E9.5 and E11.5. However, embryonic lethality upon whole-body PGP inactivation was not caused by a primary defect of the (cardio-) vascular system. Rather, PGP inactivated embryos died during the intrauterine transition from hypoxic to normoxic conditions.
Therefore, the potential impact of oxygen on PGP-dependent cell proliferation was investigated. Analyses of mouse embryonic fibroblasts (MEFs) generated from E8.5 embryos and GC1 cells cultured under normoxic and hypoxic conditions revealed that normoxia (~20% O2) causes a proliferation defect in PGP-inactivated cells, which can be rescued under
hypoxic (~1% O2) conditions. Mechanistically, it was found that the activity of triosephosphate isomerase (TPI), an enzyme previously described to be inhibited by phosphoglycolate (PG) in vitro, was attenuated in PGP-inactivated cells and embryos. TPI constitutes a critical branch point between carbohydrate- and lipid metabolism because it catalyzes the isomerization of the glycolytic intermediates dihydroxyacetone phosphate (DHAP, a precursor of the glycerol backbone required for triglyceride biosynthesis) and glyceraldehyde 3’-phosphate (GADP).
Attenuation of TPI activity, likely explains the observed elevation of glycerol 3-phosphate levels and the increased TG biosynthesis (lipogenesis). Analyses of ATP levels and oxygen consumption rates (OCR) showed that mitochondrial respiration rates and ATP production were elevated in PGP-deficient cells in a lipolysis-dependent manner. However under hypoxic conditions (which corrected the impaired proliferation of PGP-inactivated cells), OCR and ATP production was indistinguishable between PGP-deficient and PGP-proficient cells. We therefore propose that the inhibition of TPI activity by PG accumulation due to loss of PGP activity shifts cellular bioenergetics from a pro-proliferative, glycolytic metabolism to a lipogenetic/lipolytic metabolism.
Taken together, PGP acts as a metabolic phosphatase involved in the regulation of cell migration, cell proliferation and cellular bioenergetics. This thesis constitutes the basis for further studies of the interfaces between these processes, and also suggests functions of PGP for glucose and lipid metabolism in the adult organism.
For the differentiation of a embryonic stem cells (ESCs) to neuronal cells (NCs) a complex and coordinated gene regulation program is needed. One important control element for neuronal differentiation is the repressor element 1 silencing transcription factor (REST) complex, which represses neuronal gene expression in non-neuronal cells. Crucial effector proteins of the REST complex are small phosphatases such as the CTDSPs (C-terminal domain small phosphatases) that regulate polymerase II activity by dephosphorylating the C-terminal domain of the polymerase, thereby repressing target genes. The stepwise inactivation of REST, including the CTDSPs, leads to the induction of a neuron-specific gene program, which ultimately induces the formation of neurons. The spatio-temporal control of REST and its effector components is therefore a crucial step for neurogenesis.
In zebrafish it was shown that the REST-associated CTDSP2 is negatively regulated by the micro RNA (miR) -26b. Interestingly, the miR-26b is encoded in an intron of the primary transcript of CTDSP2. This gives the fundament of an intrinsic regulatory negative feedback loop, which is essential for the proceeding of neurogenesis. This feedback loop is active during neurogenesis, but inactive in non-neuronal cells. The reason for this is that the maturation of the precursor miR (pre-miR) to the mature miR-26 is arrested in non neuronal cells, but not in neurons. As only mature miRs are actively repressing genes, the regulation of miR-26 processing is an essential step in neurogenesis.
In this study, the molecular basis of miR-26 processing regulation in the context of neurogenesis was addressed. The mature miR is processed from two larger precursors: First the primary transcript is cleaved by the enzyme DROSHA in the nucleus to form the pre-miR. The pre-miR is exported from the nucleus and processed further through the enzyme DICER to yield the mature miR. The mature miR can regulate gene expression in association with the RNA-induced silencing complex (RISC).
Multiple different scenarios in which miR processing was regulated were proposed and experimentally tested. Microinjection studies using Xenopus leavis oocytes showed that slowdown or blockage of the nucleo-cytoplasmic transport are not the reason for delayed pre-miR-26 processing. Moreover, in vitro and in vivo miR-processing assays showed that maturation is most likely regulated through a in trans acting factor, which blocks processing in non neuronal cells.
Through RNA affinity chromatographic assays using zebrafish and murine lysates I was able to isolate and identify proteins that interact specifically with pre-miR-26 and could by this influence its biogenesis. Potential candidates are FMRP/FXR1/2, ZNF346 and Eral1, whose functional characterisation in the context of miR-biogenesis could now be addressed.
The second part of my thesis was executed in close colaboration with the laboratory of Prof. Albrecht Müller. The principal question was addressed how miR-26 influences neuronal gene expression and which genes are primarily affected. This research question could be addressed by using a cell culture model system, which mimics ex vivo the differentiation of ESCs to NCs via neuronal progenitor.
For the functional analysis of miR-26 knock out cell lines were generated by the CRISPR/Cas9 technology. miR-26 deficient ESC keep their pluripotent state and are able to develop NPC, but show major impairment in differentiating to NCs. Through RNA deep sequencing the miR-26 induced transcriptome differences could be analysed.
On the level of mRNAs it could be shown, that the expression of neuronal gene is downregulated in miR-26 deficient NCs. Interestingly, the deletion of miR-26 leads to selectively decreased levels of miRs, which on one hand regulate the REST complex and on the other hand are under transcriptional control by REST themself. This data and the discovery that induction of miR-26 leads to enrichment of other REST regulating miRs indicates that miR-26 initiates neurogenesis through stepwise inactivation of the REST complex.
Coagulase-negative staphylococci, particularly Staphylococcus epidermidis, have been recognised as an important cause of health care-associated infections due to catheterisation, and livestock-associated infections. The colonisation of indwelling medical devices is achieved by the formation of biofilms, which are large cell-clusters surrounded by an extracellular matrix. This extracellular matrix consists mainly of PIA (polysaccharide intercellular adhesin), which is encoded by the icaADBC-operon. The importance of icaADBC in clinical strains provoking severe infections initiated numerous investigations of this operon and its regulation within the last two decades. The discovery of a long transcript being located next to icaADBC, downstream of the regulator gene icaR, led to the hypothesis of a possible involvement of this transcript in the regulation of biofilm formation (Eckart, 2006). Goal of this work was to characterise this transcript, named ncRNA IcaZ, in molecular detail and to uncover its functional role in S. epidermidis.
The ~400 nt long IcaZ is specific for ica-positive S. epidermidis and is transcribed in early- and mid-exponential growth phase as primary transcript. The promotor sequence and the first nucleotides of icaZ overlap with the 3' UTR of the preceding icaR gene, whereas the terminator sequence is shared by tRNAThr-4, being located convergently to icaZ. Deletion of icaZ resulted in a macroscopic biofilm-negative phenotype with highly diminished PIA-biofilm. Biofilm composition was analysed in vitro by classical crystal violet assays and in vivo by confocal laser scanning microscopy under flow conditions to display biofilm formation in real-time. The mutant showed clear defects in initial adherence and decreased cell-cell adherence, and was therefore not able to form a proper biofilm under flow in contrast to the wildtype. Restoration of PIA upon providing icaZ complementation from plasmids revealed inconsistent results in the various mutant backgrounds.
To uncover the functional role of IcaZ, transcriptomic and proteomic analysis was carried out, providing some hints on candidate targets, but the varying biofilm phenotypes of wildtype and icaZ mutants made it difficult to identify direct IcaZ mRNA targets. Pulse expression of icaZ was then used as direct fishing method and computational target predictions were executed with candidate mRNAs from aforesaid approaches. The combined data of these analyses suggested an involvement of icaR in IcaZ-mediated biofilm control. Therefore, RNA binding assays were established for IcaZ and icaR mRNA. A positive gel shift was maintained with icaR 3' UTR and with 5'/3' icaR mRNA fusion product, whereas no gel shift was obtained with icaA mRNA. From these assays, it was assumed that IcaZ regulates icaR mRNA expression in S. epidermidis. S. aureus instead lacks ncRNA IcaZ and its icaR mRNA was shown to undergo autoregulation under so far unknown circumstances by intra- or intermolecular binding of 5' UTR and 3' UTR (Ruiz de los Mozos et al., 2013). Here, the Shine-Dalgarno sequence is blocked through 5'/3' UTR base pairing and RNase III, an endoribonuclease, degrades icaR mRNA, leading to translational blockade. In this work, icaR mRNA autoregulation was therefore analysed experimentally in S. epidermidis and results showed that this specific autoregulation does not take place in this organism. An involvement of RNase III in the degradation process could not be verified here. GFP-reporter plasmids were generated to visualise the interaction, but have to be improved for further investigations.
In conclusion, IcaZ was found to interact with icaR mRNA, thereby conceivably interfering with translation initiation of repressor IcaR, and thus to promote PIA synthesis and biofilm formation. In addition, the environmental factor ethanol was found to induce icaZ expression, while only weak or no effects were obtained with NaCl and glucose. Ethanol, actually is an ingredient of disinfectants in hospital settings and known as efficient effector for biofilm induction. As biofilm formation on medical devices is a critical factor hampering treatment of S. epidermidis infections in clinical care, the results of this thesis do not only contribute to better understanding of the complex network of biofilm regulation in staphylococci, but may also have practical relevance in the future.
Fluorescence microscopy has become one of the most important techniques for the imaging of biological cells and tissue, since the technique allows for selective labeling with fluorescent molecules and is highly suitable for low-light applications down to the single molecule regime. The methodological requirements are well-defined for studying membrane receptors within a highly localized nanometer-thin membrane. For example, G-protein-coupled receptors (GPCRs) are an extensively studied class of membrane receptors that represent one of the most important pharmaceutical targets. Ligand binding and GPCR activation dynamics are suspected to take place at the millisecond scale and may even be far faster. Thus, techniques that are fast, selective, and live-cell compatible are required to monitor GPCR dynamics. Fluorescence resonance energy transfer (FRET) and total internal reflection fluorescence microscopy (TIRF-M) are methods of choice to monitor the dynamics of GPCRs selectively within the cell membrane.
Despite the remarkable success of these modalities, there are limitations. Most importantly, inhomogeneous illumination can induce imaging artifacts, rendering spectroscopic evaluation difficult. Background signal due to scattering processes or imperfect labeling can hamper the signal-to-noise, thus limiting image contrast and acquisition speed. Careful consideration of the internal physiology is required for FRET sensor design, so that ligand binding and cell compatibility are well-preserved despite the fluorescence labeling procedures. This limitation of labeling positions leads to very low signal changes in FRET-based GPCR analysis. In addition, microscopy of these systems becomes even more challenging in single molecule or low-light applications where the accuracy and temporal resolution may become dramatically low. Fluorescent labels should therefore be brighter, protected from photobleaching, and as small as possible to avoid interference with the binding kinetics. The development of new fluorescent molecules and labeling methods is an ongoing process. However, a complete characterization of new labels and sensors takes time. So far, the perfect dye system for GPCR studies has not been found, even though there is high demand.
Thus, this thesis explores and applies a different approach based on improved illumination schemes for TIRF-M as well as metal-coated coverslips to enhance fluorescence and FRET efficiency. First, it is demonstrated that a 360° illumination scheme reduces typical TIRF artifacts and produces a much more homogenously illuminated field of view. Second, membrane imaging and FRET spectroscopy are improved by metal coatings that are used to modulate the fluorescent properties of common fluorescent dyes. Computer simulation methods are used to understand the underlying photophysics and to design the coatings. Third, this thesis explores the operational regime and limitations of plasmonic approaches with high sectioning capabilities. The findings are summarized by three publications that are presented in the results section of this work. In addition, the theory of fluorescence and FRET is explained, with particular attention to its emission modulations in the vicinity of metal-dielectric layers. Details of the instrumentation, computer simulations, and cell culture are described in the method section. The work concludes with a discussion of the findings within the framework of recent technological developments as well as perspectives and suggestions for future approaches complete the presented work.
Platelets, small anucleated blood cells responsible for hemostasis, interact at sights of injury with several exposed extracellular matrix (ECM) proteins through specific receptors. Ligand binding leads to activation, adhesion and aggregation of platelets. Already megakaryocytes (MKs), the immediate precursor cells in bone marrow (BM), are in constant contact to these ECM proteins (ECMP). The interaction of ECMP with MKs is, in contrast to platelets, less well understood. It is therefore important to study how MKs interact with sinusoids via the underlying ECMP. This thesis addresses three major topics to elucidate these interactions and their role in platelet biogenesis.
First, we studied the topology of ECMP within BM and their impact on proplatelet formation (PPF) in vitro. By establishing a four-color immunofluorescence microscopy we localized collagens and other ECMP and determined their degree of contact towards vessels and megakaryocytes (MKs). In in vitro assays we could demonstrate that Col I mediates increased MK adhesion, but inhibits PPF by collagen receptor GPVI. By immunoblot analyses we identified that the signaling events underyling this inhibition are different from those in platelet activation at the Src family kinase level.
Second, we determined the degree of MK-ECM interaction in situ using confocal laser scanning microscopy of four-color IF-stained femora and spleen sections. In transgenic mouse models lacking either of the two major collagen receptors we could show that these mice have an impaired association of MKs to collagens in the BM, while the MK count in spleen increased threefold. This might contribute to the overall unaltered platelet counts in collagen receptor-deficient mice.
In a third approach, we studied how the equilibrium of ECMP within BM is altered after irradiation. Collagen type IV and laminin-α5 subunits were selectively degraded at the sinusoids, while the matrix degrading protease MMP9 was upregulated in MKs. Platelet numbers decreased and platelets became hyporesponsive towards agonists, especially those for GPVI activation.
Taken together, the results indicate that MK-ECM interaction differs substantially from the well-known platelet-ECM signaling. Future work should further elucidate how ECMP can be targeted to ameliorate the platelet production and function defects, especially in patients after BM irradiation.
G protein-coupled receptors (GPCRs) form the biggest receptor family that is encoded in the human genome and represent the most druggable target structure for modern therapeutics respectively future drug development. Belonging to aminergic class A GPCRs muscarinic Acetylcholine receptors (mAChRs) are already now of clinical relevance and are also seen as promising future drug targets for treating neurodegenerative diseases like Alzheimer or Parkinson. The mAChR family consist of five subtypes showing high sequence identity for the endogenous ligand binding region and thus it is challenging until now to selectively activate a single receptor subtype. A well accepted method to study ligand binding, dynamic receptor activation and downstream signaling is the fluorescence resonance energy transfer (FRET) application. Here, there relative distance between two fluorophores in close proximity (<10 nm) can be monitored in a dynamic manner. The perquisite for that is the spectral overlap of the emission spectrum of the first fluorophore with the excitation spectrum of the second fluorophore. By inserting two fluorophores into the molecular receptor structure receptor FRET sensors can serve as a powerful tool to study dynamic receptor pharmacology.
Dualsteric Ligands consist of two different pharmacophoric entities and are regarded as a promising ligand design for future drug development. The orthosteric part interacts with high affinity with the endogenous ligand binding region whereas the allosteric part binds to a different receptor region mostly located in the extracellular vestibule. Both moieties are covalently linked. Dualsteric ligands exhibit a dynamic ligand binding. The dualsteric binding position is characterized by a simultaneous binding of the orthosteric and allosteric moiety to the receptor and thus by receptor activation. In the purely allosteric binding position no receptor activation can be monitored.
In the present work the first receptor FRET sensor for the muscarinic subtype 1 (M1) was generated and characterized. The M1-I3N-CFP sensor showed an unaltered physiological behavior as well as ligand and concentration dependent responses. The sensor was used to characterize different sets of dualsteric ligands concerning their pharmacological properties like receptor activation. It was shown that the hybrids consisting of the synthetic full agonist iperoxo and the positive allosteric modulator of BQCA type is very promising. Furthermore, it was shown for orthosteric as well as dualsteric ligands that the degree of receptor activation is highly dependent on the length of and the chemical properties of the linker moiety. For dualsteric ligands a bell-shaped activation characteristic was reported for the first time, suggesting that there is an optimal linker length for dualsteric ligands. The gained knowledge about hybrid design was then used to generate and characterize the first photo-switchable dualsteric ligand. The resulting hybrids were characterized with the M1-I3N-CFP sensor and were described as photo-inactivatable and dimmable. In addition to the ligand characterization the ligand application methodology was further developed and improved. Thus, a fragment-based screening approach for dualsteric ligands was reported in this study for the first time. With this approach it is possible to investigate dualsteric ligands in greater detail by applying either single ligand fragments alone or in a mixture of building blocks. These studies revealed the insights that the effect of dualsteric ligands on a GPCR can be rebuild by applying the single building blocks simultaneously. The fragment-based screening provides high potential for the molecular understanding of dualsteric ligands and for future screening approaches. Next, a further development of the standard procedure for measuring FRET by sensitized emission was performed. Under normal conditions single cell FRET is measured on glass coverslips. After coating the coverslips surface with a 20 nm thick gold layer an increased FRET efficiency up to 60 % could be reported. This finding was validated in different approaches und in different configurations. This FRET enhancement by plasmonic surfaces was until yet unreported in the literature for physiological systems and make FRET for future projects even more powerful.
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.
For cellular viability, transcription is a fundamental process. Hereby, the DNA plays the most elemental and highly versatile role. It has long been known that promoters contain conserved and often well-defined motifs, which dictate the site of transcription initiation by providing binding sites for regulatory proteins. However, research within the last decade revealed that it is promoters lacking conserved promoter motifs and transcribing constitutively expressed genes that constitute the majority of promoters in eukaryotes. While the process of transcription initiation is well studied, whether defined DNA sequence motifs are required for the transcription of constitutively expressed genes in eukaryotes remains unknown. In the highly divergent protozoan parasite Trypanosoma brucei, most of the proteincoding genes are organized in large polycistronic transcription units. The genes within one polycistronic transcription unit are generally unrelated and transcribed by a common transcription start site for which no RNA polymerase II promoter motifs have been identified so far. Thus, it is assumed that transcription initiation is not regulated but how transcription is initiated in T. brucei is not known. This study aimed to investigate the requirement of DNA sequence motifs and chromatin structures for transcription initiation in an organism lacking transcriptional regulation. To this end, I performed a systematic analysis to investigate the dependence of transcription initiation on the DNA sequence. I was able to identify GT-rich promoter elements required for directional transcription initiation and targeted deposition of the histone variant H2A.Z, a conserved component during transcription initiation. Furthermore, nucleosome positioning data in this work provide evidence that sites of transcription initiation are rather characterized by broad regions of open and more accessible chromatin than narrow nucleosome depleted regions as it is the case in other eukaryotes. These findings highlight the importance of chromatin during transcription initiation. Polycistronic RNA in T. brucei is separated by adding an independently transcribed miniexon during trans-splicing. The data in this work suggest that nucleosome occupancy plays an important role during RNA maturation by slowing down the progressing polymerase and thereby facilitating the choice of the proper splice site during trans-splicing. Overall, this work investigated the role of the DNA sequence during transcription initiation and nucleosome positioning in a highly divergent eukaryote. Furthermore, the findings shed light on the conservation of the requirement of DNA motifs during transcription initiation and the regulatory potential of chromatin during RNA maturation. The findings improve the understanding of gene expression regulation in T. brucei, a eukaryotic parasite lacking transcriptional Regulation.
Cadherin-13 (CDH13) is an atypical member of the cadherin superfamily, a group of membrane proteins mediating calcium-dependent cellular adhesion. Although CDH13 shows the classical extracellular cadherin structure, the typical transmembrane and cytoplasmic domains are absent. Instead, CDH13 is attached to the cell membrane via a glycosylphosphatidylinositol (GPI) anchor. These findings and many studies from different fields suggest that CDH13 also plays a role as a cellular receptor. Interestingly, many genome-wide association studies (GWAS) have found CDH13 as a risk gene for attention-deficit/hyperactivity disorder (ADHD) and other neurodevelopmental disorders. In previous work from our research group, strong expression of Cdh13 mRNA in interneurons of the hippocampal stratum oriens (SO) was detected. Therefore, double-immunofluorescence studies were used to evaluate the degree of co-expression of CDH13 with seven markers of GABAergic interneuron subtypes. For this purpose, murine brains were double stained against CDH13 and the respective marker and the degree of colocalization in the SO of the hippocampus was assessed. Based on the result of this immunofluorescence study, quantitative differences in interneuron subtypes of the SO between Cdh13 knockout (ko), heterozygote (het) and wildtype (wt) mice were investigated in this dissertation using stereological methods. In addition, genotype- dependent differences in the expression of genes involved in GABAergic and glutamatergic neurotransmission were analyzed by quantitative real-time PCR (qRT-PCR). Primers targeting different GABA receptor subunits, vesicular GABA and glutamate transporter, GABA synthesizing enzymes and their interaction partners were used for this purpose.
The results of the stereological quantification of the interneuron subtypes show no significant differences in cell number, cell density or volume of the SO between Cdh13 ko, het and wt mice. On the other hand, qRT-PCR results indicate significant differences in the expression of tropomyosin-related kinase B gene (TrkB), which encodes the receptor of brain-derived neurotrophic factor (BDNF), a regulator of GABAergic neurons. This finding supports a role for CDH13 in the regulation of BDNF signaling in the hippocampus.
Improved treatment options for the degenerative joint disease osteoarthritis (OA) are of major interest, since OA is one of the main sources of disability, pain, and socioeconomic burden worldwide [202]. According to epidemiological data, already 27 million people suffer from OA in the US [23]. Moreover, the WHO expects OA to be the fourth most common cause of disability in 2020 [203], illustrating the need for effective and long-lasting therapy options of severe cartilage defects. Despite numerous clinically available products for the treatment of cartilage defects [62], the development of more cartilage-specific materials is still at the beginning.
Hyaluronic acid (HA) is a major component of the cartilaginous extracellular matrix (ECM) and inherently creates a cell-friendly niche by providing cell attachment and migration sites. Furthermore, it is known that the functional groups of HA are well suited for chemical modification. These characteristics render HA an attractive material for hydrogel-based tissue engineering approaches. Poly(glycidol) (PG) as chemical crosslinker basically features similar chemical characteristics as the widely used poly(ethylene glycol) (PEG), but provides additional side groups at each repeating unit that can be further chemically functionalized. With the introduction of PG as multifunctional crosslinker for HA gels, a higher cross-linking density and, accordingly, a greater potential for biomimetic functionalization may be achieved. However, despite the mentioned potential benefits, PG has not been used for cartilage regeneration approaches so far.
The initial aim of the study was to set up and optimize a HA-based hydrogel for the chondrogenic differentiation of mesenchymal stromal cells (MSCs), using different amounts and variations of cross-linkers. Therefore, the hydrogel composition was optimized by the utilization of different PEG diacrylate (PEGDA) concentrations to cross-link thiol-modified HA (Glycosil, HA-SH) via Michael addition. We aimed to generate volumestable scaffolds that simultaneously enable a maximum of ECM deposition. Histological and biochemical analysis showed 0.4% PEGDA as the most suitable concentration for these requirements (Section 5.1.2).
In order to evaluate the impact of a differently designed cross-linker on MSC chondrogenesis, HA-SH was cross-linked with PEGTA (0.6%) and compared to PEGDA (0.4%) in a next step. Following this, acrylated PG (PG-Acr) as multifunctional cross-linker alternative to acrylated PEG was evaluated. It provides around five times more functional groups when utilized in PG-Acr (0.6%) HA-SH hydrogels compared to PEGTA (0.6%) HA-SH hydrogels, thus enabling higher degrees of biomimetic functionalization. Determination of cartilage-specific ECM components showed no substantial differences between both cross-linkers while the deposition of cartilaginous matrix appeared more homogeneous in HA-SH PG-Acr gels. Taken together, we were able to successfully increase the possibilities for biomimetic functionalization in the developed HA-SH hydrogel system by the introduction of PG-Acr as cross-linker without negatively affecting MSC chondrogenesis (Section 5.1.3).
The next part of this thesis focused extensively on the biomimetic functionalization of PG-Acr (0.6%) cross-linked HA-SH hydrogels. Here, either biomimetic peptides or a chondrogenic growth factor were covalently bound into the hydrogels.
Interestingly, the incorporation of a N-cadherin mimetic (HAV), a collagen type II binding (KLER), or a cell adhesion-mediating peptide (RGD) yielded no improvement of MSC chondrogenesis. For instance, the covalent binding of 2.5mM HAV changed morphology of cell nuclei and reduced GAG production while the incorporation of 1.0mM RGD impaired collagen production. These findings may be attributed to the already supportive conditions of the employed HA-based hydrogels for chondrogenic differentiation. Most of the previous studies reporting positive peptide effects on chondrogenesis have been carried out in less supportive PEG hydrogels or in significantly stiffer MeHA-based hydrogels [99, 101, 160]. Thus, the incorporation of peptides may be more important under unfavorable conditions while inert gel systems may be useful for studying single peptide effects (Section 5.2.1).
The chondrogenic factor transforming growth factor beta 1 (TGF-b1) served as an example for growth factor binding to PG-Acr. The utilization of covalently bound TGF-b1 may thereby help overcome the need for repeated administration of TGF-b1 in in vivo applications, which may be an advantage for potential clinical application. Thus, the effect of covalently incorporated TGF-b1 was compared to the effect of the same amount of TGF-b1 without covalent binding (100nM TGF-b1) on MSC chondrogenesis. It was successfully demonstrated that covalent incorporation of TGF-b1 had a significant positive effect in a dose-dependent manner. Chondrogenesis of MSCs in hydrogels with covalently bound TGF-b1 showed enhanced levels of chondrogenesis compared to hydrogels into which TGF-b1 was merely mixed, as shown by stronger staining for GAGs, total collagen, aggrecan and collagen type II. Biochemical evaluation of GAG and collagen amounts, as well as Western blot analysis confirmed the histological results. Furthermore, the positive effect of covalently bound TGF-b1 was shown by increased expression of chondrogenic marker genes COL2A1, ACAN and SOX9. In summary, covalent growth factor incorporation utilizing PG-Acr as cross-linker demonstrated significant positive effects on chondrogenic differentiation of MSCs (Section 5.2.2).
In general, PG-Acr cross-linked HA hydrogels generated by Michael addition represent a versatile hydrogel platform due to their high degree of acrylate functionality. These hydrogels may further offer the opportunity to combine several biological modifications, such as the incorporation of biomimetic peptides together with growth factors, within one cell carrier.
A proof-of-principle experiment demonstrated the suitability of pure PG gels for studying single peptide effects. Here, the hydrogels were generated by the utilization of thiol-ene-click reaction. In this setting, without the supportive background of hyaluronic acid, MSCs showed enhanced chondrogenic differentiation in response to the incorporation of 1.0mM HAV. This was demonstrated by staining for GAGs, the cartilage-specific ECM molecules aggrecan and type II collagen, and by increased GAG and total collagen amounts shown by biochemical analysis. Thus, pure PG gels exhibit the potential to study the effects and interplay of peptides and growth factors in a highly modifiable, bioinert hydrogel environment.
The last section of the thesis was carried out as part of the EU project HydroZONES that aims to develop and generate zonal constructs. The importance of zonal organization has attracted increased attention in the last years [127, 128], however, it is still underrepresented in tissue engineering approaches so far. Thus, the feasibility of zonal distribution of cells in a scaffold combining two differently composed hydrogels was investigated. A HA-SH(FMZ) containing bottom layer was generated and a pure PG top layer was subsequently cast on top of it, utilizing both times thiol-ene-click reaction. Indeed, stable, hierarchical constructs were generated that allowed encapsulated MSCs to differentiate chondrogenically in both zones as shown by staining for GAGs and collagen type II, and by quantification of GAG amount. Thus, the feasibility of differently composed zonal hydrogels utilizing PG as a main component was successfully demonstrated (Section 5.4).
With the first-time utilization and evaluation of PG-Acr as versatile multifunctional cross-linker for the preparation of Michael addition-generated HA-SH hydrogels in the context of cartilage tissue engineering, a highly modifiable HA-based hydrogel system was introduced. It may be used in future studies as an easily applicable and versatile toolbox for the generation of biomimetically functionalized hydrogels for cell-based cartilage regeneration. The introduction of reinforcement structures to enhance mechanical resistance may thereby further increase the potential of this system for clinical applications.
Additionally, it was also demonstrated that thiol-ene clickable hydrogels can be used for the generation of cell-laden, pure PG gels or for the generation of more complex, coherent zonal constructs. Furthermore, thiol-ene clickable PG hydrogels have already been further modified and successfully been used in 3D bioprinting experiments [204]. 3D bioprinting, as part of the evolving biofabrication field [205], offers the possibilities to generate complex and hierarchical structures, and to exactly position defined layers, yet at the same time alters the requirements for the utilized hydrogels [159, 206–209]. Since a robust chondrogenesis of MSCs was demonstrated in the thiol-ene clickable hydrogel systems, they may serve as a basis for the development of hydrogels as so called bioinks which may be utilized in more sophisticated biofabrication processes.
The transcription factor Myc interacts with several co-factors to regulate growth and proliferationand thereby enables normal animal development. Deregulation of Myc is associated witha wide range of human tumors. Myc binds to DNA together with its dimerization partner Max, preferentially to canonical E-box motifs, but this sequence-specific interaction is probably not sufficient for Myc’s binding to target genes.
In this work, the PAF1 complex was characterized as a novel co-factor of Myc in Drosophila melanogaster. All components of the complex are required for Myc’s recruitment to chromatin, but the subunit Atu has the strongest effect on Myc's binding to target genes through ist direct physical interaction with Myc. Unexpectedly, the impact of Atu depletion on the Expression of Myc target genes was weak compared to its effect on Myc binding. However, the influence of Atu becomes more prominent in situations of elevated Myc levels in vivo . Mycrepressed as well as Myc-activated targets are affected, consistent with the notion that Myc
recruitment is impaired.
An independent set of analyses revealed that Myc retains substantial activity even in the complete absence of Max. The overexpression of Myc in Max0 mutants specifically blocks their pupariation without affecting their survival, which raised the possibility that Myc might
affect ecdysone biosynthesis. This connection was studied in the second part of this Thesis which showed that Myc inhibits the expression of ecdysteroidogenic genes and thereby the production of ecdysone. Myc most likely affects the signaling pathways (PTTH and insulin
signaling) upstream of the PG, the organ where ecdysone is produced. By combining existing ChIPseq, RNAseq and electronic annotation data, we identified five potential Maxindependent Myc targets and provided experimental data that they might be involved in Myc's effect on Max mutant animals. Together our data confirm that some Myc functions are Max-independent and they raise the possibility that this effect might play a role during replication.
Coffin-Lowry syndrome is a rare syndromic form of X-linked mental retardation caused by heterogeneous loss-of-function mutations in the gene RPS6KA3 that encodes the RSK2 protein. Clinical features are delayed motor development, small height, progressive skeletal malformations and mental retardation.
Rsk2 deficiency affects behavioral, cellular and molecular functions. To characterize and investigate how this deficiency affects these functions, we made a series of experiments using Rsk2-deficient mice as the animal model for Coffin-Lowry syndrome.
We applied a battery of behavioral tests and included the use of the IntelliCage for the first time as a behavioral paradigm to study anxiety-like behavior and depression-like behavior in Rsk2-deficient mice. Results from the conventional behavioral tests and from the IntelliCage indicate that Rsk2-deficient mice may have an anti-anxiety and anti-depressive phenotype.
We evaluated in Rsk2 deficient mice the relative gene expression of a set of genes coding for proteins related to RSK2 which are involved in fear memory, synaptic plasticity, neurogenesis, learning, emotional behavior and stress. We found gene expression alterations in the prefrontal cortex and striatum. These results suggest that RSK2 may be involved in the expression of the genes.
RSK2 is known to be related to monoamine neurotransmitter function. We measured the levels of dopamine, serotonin and noradrenaline/norepinephrine and their metabolites in different brain regions of Rsk2-deficient mice. We found differences in the dopaminergic and noradrenergic systems suggesting an increased or decreased activity of these neurotransmission systems as a result of Rsk2 deficiency.
Adult neurogenesis is a form of neuronal plasticity and a multi-step process of cell development. We explored if this form of neuronal plasticity was affected by Rsk2-deficiency. Our results indicate that adult hippocampal neurogenesis is not influenced by lifelong Rsk2 deficiency. It would be worth to analyze in the future other aspects of neuroplasticity.
We have confirmed, that behavioral characteristics of Rsk2-deficient mice make them an interesting model to study the Coffin-Lowry syndrome by extending the behavioral characterization on the emotional level. Furthermore, we have extended the characterization of the model on a molecular level, opening new opportunities to study and understand the pathophysiological basis of the Coffin-Lowry syndrome.