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Institute
- Theodor-Boveri-Institut für Biowissenschaften (482) (remove)
Sonstige beteiligte Institutionen
- Institut für Tierökologie und Tropenbiologie (2)
- Boehringer Ingelheim Pharma GmbH & Co. KG (1)
- Deutsches Krebsforschungszentrum Heidelberg (1)
- ESPCI Paris (1)
- European Molecular Biology Laboratory, Heidelberg, Germany (1)
- Fachgebiet für Populationsgenomik bei Nutztieren, Universität Hohenheim (1)
- Klinische Mikrobiologie am Universitätsklinikum Erlangen (1)
- König-Ludwig-Haus, Orthopedic Clinic, Würzburg (1)
- Landesbetrieb Landwirtschaft Hessen, Bieneninstitut Kirchhain (1)
- Lehrstuhl für Tierökologie und Tropenbiologie, Universität Würzburg (1)
ResearcherID
- J-8841-2015 (1)
- N-2030-2015 (1)
EU-Project number / Contract (GA) number
- 311781 (1)
Fanconi anemia (FA) is an autosomal recessive or X-chromosomal inherited disorder, which is not only phenotypically but also genotypically very heterogeneous. While its hallmark feature is progressive bone marrow failure, many yet not all patients suffer additionally from typical congenital malformations like radial ray defects and growth retardation. In young adulthood the cumulative risk for developing hematological or other malignancies is compared to the general population several hundred-fold increased. The underlying molecular defect is the deficiency of DNA interstrand crosslink (ICL) repair. ICLs are deleterious lesions, which interfere with crucial cellular processes like transcription and replication and thereby can lead to malignant transformation, premature senescence or cell death. To overcome this threat evolution developed a highly complex network of interacting DNA repair pathways, which is conserved completely only in vertebrates. The so called FA/BRCA DNA damage response pathway is able to recognize ICLs on stalled replication forks and promotes their repair through homologous recombination (HR). Today we know 15 FA genes (FANCA, -B, -C, -D1, -D2, -E, -F, -G, -I, -J, -L, -M, -N, -O and -P) whose products are involved in this pathway. Although more than 80% of FA patients carry biallelic mutations in either FANCA, FANCC or FANCG, there are still some who cannot be assigned to any of the known complementation groups. This work aimed to indentify the di¬sease causing mutations in a cohort of those unassigned patients. Initial screens of the candidate genes FAN1, MHF1 and MHF2 did not reveal any pathogenic alterations. Moreover, FAN1 could be excluded as FA candidate gene because patients carrying a homozygous microdeletion including the FAN1 locus did not show a phenotype comparable to FA patients. In the case of MHF1 and MHF2 the reason for the negative screening result is not clear. Mutation carriers might be rare or, regarding the diverse and also FA pathway independent protein functions, phenotypically not comparable to FA patients. Nevertheless, this study contri¬buted to the identification and characterization of the most recent members of the FA pathway - RAD51C (FANCO), SLX4 (FANCP) and XPF (FANCQ). FANCO is one of the RAD51 paralogs and is involved in crucial steps of HR. But since the only reported FA-O patient has so far not developed any hematological anomalies, FANCO is tentatively designated as gene underlying an FA-like disorder. In contrast, patients carrying biallelic mutations in FANCP do not only show hematological anomalies, but as well congenital malformations typical for FA. The distinct role of FANCP in the FA pathway could not be determined, but it is most likely the coordination of structure-specific nucleases during ICL excision. One of these nucleases is the heterodimer XPF/ERCC1. XPF is probably disease causing in the complementation group FA-Q and is the first FA gene, which was identified by Next Generation Sequencing (NGS). Extraordinarily is that mutations in this gene had previously been reported to cause two other disorders, xeroderma pigmentosum and segmental progeria. Despite some overlaps, it was shown that the divergent phenotypes could clearly be distinguished and are caused by distinct functional defects of XPF. Additionally, this work aimed to improve and accelerate the genotyping process of FA patients in general. Therefore, classical approaches should be complemented or fully replaced by approa¬ches using NGS. Massively parallel sequencing of the whole exome proved to be most appro¬priate and the establishment of an FA-specific analysis pipeline facilitated improved molecular diagnostics by combining complementation group assignment and mutation analysis in one step. Consequently two NGS studies revealed the pathogenic defect in several previously unassigned FA patients and thereby added another patient to one of the most recent subtypes, FA-P. In summary, this work contributed not only to further completion of the FA/BRCA DNA repair network by adding three novel genes, it also showed that classical molecular approaches for re¬search as well as for diagnostics could be replaced by NGS.
Analysis of \(Trypanosoma\) \(brucei\) motility and the infection process in the tsetse fly vector
(2021)
African trypanosomes are protist pathogens that are infective for a wide spectrum of mammalian hosts. Motility has been shown to be essential for their survival and represents an important virulence factor. Trypanosoma brucei is transmitted by the bite of the bloodsucking tsetse fly, the only vector for these parasites. The voyage through the fly is complex and requires several migration, proliferation and differentiation steps, which take place in a defined order and in specific fly tissues.
The first part of this doctoral thesis deals with the establishment of the trypanosome tsetse system as a new model for microswimmer analysis. There is an increasing interdisciplinary interest in microbial motility, but a lack of accessible model systems. Therefore, this work introduces the first enclosed in vivo host parasite system that is suitable for analysis of diverse microswimmer types in specific microenvironments. Several methods were used and adapted to gain unprecedented insights into trypanosome motion, the fly´s interior architecture and the physical interaction between host and parasite. This work provides a detailed overview on trypanosome motile behavior as a function of development in diverse host surroundings. In additional, the potential use of artificial environments is shown. This can be used to partly abstract the complex fly architecture and analyze trypanosome motion in defined nature inspired geometries.
In the second part of the thesis, the infection of the tsetse fly is under investigation. Two different trypanosome forms exist in the blood: proliferative slender cells and cell cycle arrested stumpy cells. Previous literature states that stumpy cells are pre adapted to survive inside the fly, whereas slender cells die shortly after ingestion. However, infection experiments in our laboratory showed that slender cells were also potentially infective. During this work, infections were set up so as to minimize the possibility of stumpy cells being ingested, corroborating the observation that slender cells are able to infect flies. Using live cell microscopy and fluorescent reporter cell lines, a comparative analysis of the early development following infection with either slender or stumpy cells was performed. The experiments showed, for the first time, the survival of slender trypanosomes and their direct differentiation to the procyclic midgut stage, contradicting the current view in the field of research. Therefore, we can shift perspectives in trypanosome biology by proposing a revised life cycle model of T. brucei, where both bloodstream stages are infective for the vector.
Cellular growth and proliferation are among the most important processes for cells and
organisms. One of the major determinants of these processes is the amount of proteins
and consequently also the amount of ribosomes. Their synthesis involves several hundred
proteins and four different ribosomal RNA species, is highly coordinated and very
energy-demanding. However, the molecular mechanims of transcriptional regulation of
the protein-coding genes involved, is only poorly understood in mammals.
In this thesis, unbiased genome-wide knockout reporter screens were performed, aiming
to identify previously unknown transcriptional regulators of ribosome biogenesis
factors (RiBis), which are important for the assembly and maturation of ribosomes,
and ribosomal proteins (RPs), which are ribosomal components themself. With that
approach and follow-up (validation) experiments, ALDOA and RBM8A among others,
could be identified as regulators of ribosome biogenesis.
Depletion of the glycolytic enzyme ALDOA led to a downregulation of RiBi- and RPpromoter
driven reporters on protein and transcript level, as well as to a downregulation
of ribosome biogenesis gene transcripts and of mRNAs of other genes important for
proliferation.
Reducing the amount of the exon junction complex protein RBM8A, led to a more prominent
downregulation of one of the fluorescent reporters, but this regulation was independent
of the promoter driving the expression of the reporter. However, acute protein
depletion experiments in combination with nascent RNA sequencing (4sU-Seq)
revealed, that mainly cytosolic ribosomal proteins (CRPs) were downregulated upon
acute RBM8A withdrawal. ChIP experiments showed RBM8A binding to promoters of
RP genes, but also to other chromatin regions. Total POL II or elongating and initiating
POL II levels were not altered upon acute RBM8A depletion.
These data provide a starting point for further research on the mechanisms of transcriptional
regulation of RP and RiBi genes in mammals.
Structure and dynamics of the plasma membrane: a single-molecule study in \(Trypanosoma\) \(brucei\)
(2024)
The unicellular, flagellated parasite Trypanosoma brucei is the causative agent of human African sleeping sickness and nagana in livestock. In the last decades, it has become an established eukaryotic model organism in the field of biology, as well as in the interdisciplinary field of biophysics. For instance, the dense variant surface glycoprotein (VSG) coat offers the possibility to study the dynamics of GPI-anchored proteins in the plasma membrane of living cells. The fluidity of the VSG coat is not only an interesting object of study for its own sake, but is critically important for the survival of the parasite in the mammalian host. In order to maintain the integrity of the coat, the entire VSG coat is recycled within a few minutes. This is surprisingly fast for a purely diffusive process with the flagellar pocket (FP) as the sole site for endo- and exocytosis. Previous studies characterising VSG dynamics using FRAP reported diffusion coefficients that were not sufficient to to enable fast turnover based on passive VSG randomisation on the trypanosome surface.
In this thesis, live-cell single-molecule fluorescence microscopy (SMFM) was employed to elucidate whether VSG diffusion coefficients were priorly underestimated or whether directed forces could be involved to bias VSGs towards the entrance of the FP. Embedding the highly motile trypanosomes in thermo-stable hydrogels facilitated the investigation of VSG dynamics on living trypanosomes at the mammalian host's temperature of 37°C. To allow for a spatial correlation of the VSG dynamics to the FP entrance, a cell line was employed harbouring a fluorescently labelled structure as a reference. Sequential two-colour SMFM was then established to allow for recording and registration of the dynamic and static single-molecule information.
In order to characterise VSG dynamics, an algorithm to obtain reliable information from short trajectories was adapted (shortTrAn). It allowed for the quantification of the local dynamics in two distinct scenarios: diffusion and directed motion. The adaptation of the algorithm to the VSG data sets required the introduction of an additional projection filter. The algorithm was further extended to take into account the localisation errors inherent to single-particle tracking. The results of the quantification of diffusion and directed motion were presented in maps of the trypanosome surface, including an outline generated from a super-resolved static structure as a reference. Information on diffusion was displayed in one map, an ellipse plot. The colour code represented the local diffusion coefficient, while the shape of the ellipses provided an indication of the diffusion behaviour (aniso- or isotropic diffusion). The eccentricity of the ellipses was used to quantify deviations from isotropic diffusion. Information on directed motion was shown in three maps: A velocity map, representing the amplitude of the local velocities in a colour code. A quiver plot, illustrating the orientation of directed motion, and a third map which indicated the relative standard error of the local velocities colour-coded. Finally, a guideline based on random walk simulations was used to identify which of the two motion scenarios dominated locally. Application of the guideline to the VSG dynamics analysed by shortTrAn yielded supermaps that showed the locally dominant motion mode colour-coded.
I found that VSG dynamics are dominated by diffusion, but several times faster than previously determined. The diffusion behaviour was additionally characterised by spatial heterogeneity. Moreover, isolated regions exhibiting the characteristics of round and elongated traps were observed on the cell surface. Additionally, VSG dynamics were studied with respect to the entrance of the FP. VSG dynamics in this region displayed similar characteristics compared to the remainder of the cell surface and forces biasing VSGs into the FP were not found.
Furthermore, I investigated a potential interference of the attachment of the cytoskeleton to the plasma membrane with the dynamics of VSGs which are anchored to the outer leaflet of the membrane. Preliminary experiments were conducted on osmotically swollen trypanosomes and trypanosomes depleted for a microtubule-associated protein anchoring the subpellicular microtubule cytoskeleton to the plasma membrane. The measurements revealed a trend that detachment of the cytoskeleton could be associated with a reduction in the VSG diffusion coefficient and a loss of elongated traps. The latter could be an indication that these isolated regions were caused by underlying structures associated with the cytoskeleton.
The measurements on cells with an intact cytoskeleton were complemented by random walk simulations of VSG dynamics with the newly determined diffusion coefficient on long time scales not accessible in experiments. Simulations showed that passive VSG randomisation is fast enough to allow for a turnover of the full VSG coat within a few minutes. According to an estimate based on the known rate of endocytosis and the newly determined VSG diffusion coefficient, the majority of exocytosed VSGs could escape from the FP to the cell surface without being immediately re-endocytosed.
The development of ethanol tolerance is due to changes in synaptic plasticity. Since the mechanisms mediating synaptic plasticity are probably defective in the mutant hangAE10, it was a goal of the present study to find out how HANG contributes to synaptic plasticity. In particular, it was important to clarify in which neuronal process HANG plays a role. Antibody stainings against HANG revealed that the protein is localized in all neuronal nuclei of larval and adult brains; the staining is absent in hangAE10, thus confirming that this P-element insertion stock is a protein null for HANG. Detailed analysis of the subnuclear distribution of HANG showed that HANG immunoreactivity is enriched at distinct spots in the nucleus in a speckled pattern; these speckles are found at the inside of the nuclear membrane and do not colocalize with chromatin nor with the nucleolus; thus, HANG is probably involved in the stabilization, processing or export of RNAs. As synaptic plasticity can be studied in single neurons at the larval neuromuscular junction, the morphology of the synaptic terminals of hangAE10 mutants was analyzed at muscle 6/7, segment A4. These studies revealed that hangAE10 mutants display a 40 % increase in bouton number and axonal branch length; in addition, some boutons have an abnormal hourglass-like shape, suggesting that they are arrested in a semi-separated state following the initiation of bouton division. The increase in bouton number of hang mutants is mainly due to an increase in numbers of type Ib boutons. The analysis of the distribution of several synaptic markers in hang mutants did not show abnormalities. The presynaptic expression of HANG in hang mutants rescues the increase in bouton number and axonal branch length, thus proving that the phenotypes seen in the P-element insertion hangAE10 are attributable to the lack of HANG rather than to effects of the P-element marker rosy or to a secondary hit on the same chromsome during mutagensis. This finding is further supported by the fact that postsynaptic expression of HANG does not rescue the abnormal NMJ morphology of hangAE10. Alterations in cAMP levels regulate the number of boutons; since hang mutants display an increase in bouton number, the questions was whether this morphological abnormality was due to defects in cAMP signalling. To test this hypothesis, hangAE10 NMJs were compared to those of the hypomorphic allele dnc1 that has a defective cAMP cascade. Some aspects of the NMJ phenotype (e.g. the increase in bouton number and the unaltered ratio of active zones per bouton area) are similar in hangAE10 and dnc1, other differ. Expression of a UAS-dnc transgene in hangAE10 mutants does not modify the phenotype. In summary, the results of this study indicate that nuclear protein HANG might be involved in isoform-specific splicing of genes required for synaptic plasticity at the NMJ.
Zars and co-workers were able to localize an engram of aversive olfactory memory to the mushroom bodies of Drosophila (Zars et al., 2000). In this thesis, I followed up on this finding in two ways. Inspired by Zars et al. (2000), I first focused on the whether it would also be possible to localize memory extinction.While memory extinction is well established behaviorally, little is known about the underlying circuitry and molecular mechanisms. In extension to the findings by Zars et al (2000), I show that aversive olfactory memories remain localized to a subset of mushroom body Kenyon cells for up to 3 hours. Extinction localizes to the same set of Kenyon cells. This common localization suggests a model in which unreinforced presentations of a previously learned odorant intracellularly antagonizes the signaling cascades underlying memory formation. The second part also targets memory localization, but addresses appetitive memory. I show that memories for the same olfactory cue can be established through either sugar or electric shock reinforcement. Importantly, these memories localize to the same set of neurons within the mushroom body. Thus, the question becomes apparent how the same signal can be associated with different events. It is shown that two different monoamines are specificaly necessary for formation of either of these memories, dopamine in case of electric shock and octopamine in case of sugar memory, respectively. Taking the representation of the olfactory cue within the mushroom bodies into account, the data suggest that the two memory traces are located in the same Kenyon cells, but in separate subcellular domains, one modulated by dopamine, the other by octopamine. Taken together, this study takes two further steps in the search for the engram. (1) The result that in Drosophila olfactory learning several memories are organized within the same set of Kenyon cells is in contrast to the pessimism expressed by Lashley that is might not be possible to localize an engram. (2) Beyond localization, a possibible mechanism how several engrams about the same stimulus can be localized within the same neurons might be suggested by the models of subcellular organisation, as postulated in case of appetitive and aversive memory on the one hand and acquisition and extinction of aversive memory on the other hand.
The vertebrate spinal cord is composed of billions of neurons and glia cells, which are formed in a highly coordinated manner during early neurogenesis. Specification of these cells at distinct positions along the dorsoventral (DV) axis of the developing spinal cord is controlled by a ventrally located signaling center, the medial floor plate (MFP). Currently, the origin and time frame of specification of this important organizer are not clear. During my PhD thesis, I have analyzed the function of the novel secreted growth factor Midkine-a (Mdka) in zebrafish. In higher vertebrates, mdk and the related factor pleiotrophin (ptn) are widely expressed during embryogenesis and are implicated in a variety of processes. The in-vivo function of both factors, however, is unclear, as knock-out mice show no embryonic phenotype. We have isolated two mdk co-orthologs, mdka and mdkb, and one single ptn gene in zebrafish. Molecular phylogenetic analyses have shown that these genes evolved after two large gene block duplications. In contrast to higher vertebrates, zebrafish mdk and ptn genes have undergone functional divergence, resulting in mostly non-redundant expression patterns and functions. I have shown by overexpression and knock-down analyses that Mdka is required for MFP formation during zebrafish neurulation. Unlike the previously known MFP inducing factors, mdka is not expressed within the embryonic shield or tailbud but is dynamically expressed in the paraxial mesoderm. I used epistatic and mutant analyses to show that Mdka acts independently from these factors. This indicates a novel mechanism of Mdka dependent MFP formation during zebrafish neurulation. To get insight into the signaling properties of zebrafish Mdka, the function of both Mdk proteins and the candidate receptor Anaplastic lymphoma kinase (Alk) have been compared. Knock-down of mdka and mdkb resulted in the same reduction of iridophores as in mutants deficient for Alk. This indicates that Alk could be a putative receptor of Mdks during zebrafish embryogenesis. In most vertebrate species a lateral floor plate (LFP) domain adjacent to the MFP has been defined. In higher vertebrates it has been shown that the LFP is located within the p3 domain, which forms V3 interneurons. It is unclear, how different cell types in this domain are organized during early embryogenesis. I have analyzed a novel homeobox gene in zebrafish, nkx2.2b, which is exclusively expressed in the LFP. Overexpression, mutant and inhibitor analyses showed that nkx2.2b is activated by Sonic hedgehog (Shh), but repressed by retinoids and the motoneuron-inducing factor Islet-1 (Isl1). I could show that in zebrafish LFP and p3 neuronal cells are located at the same level along the DV axis, but alternate along the anteroposterior (AP) axis. Moreover, these two different cell populations require different levels of HH signaling and nkx2.2 activities. This provides new insights into the structure of the vertebrate spinal cord and suggests a novel mechanism of neural patterning.
The molecular architecture of the meiotic chromosome axis as revealed by super-resolution microscopy
(2018)
During meiosis proteins of the chromosome axis are important for monitoring chromatin structure and condensation, for pairing and segregation of chromosomes, as well as for accurate recombination. They include HORMA-domain proteins, proteins of the DNA repair system, synaptonemal complex (SC) proteins, condensins and cohesins. To understand more about their function in shaping the meiotic chromosome it is crucial to establish a defined model of their molecular architecture. Up to now their molecular organization was analysed using conventional methods, like confocal scanning microscopy (CLSM) and transmission electron microscopy (TEM). Unfortunately, these techniques are limited either by their resolution power or their localization accuracy. In conclusion, a lot of data on the molecular organization of chromosome axis proteins stays elusive. For this thesis the molecular structure of the murine synaptonemal complex (SC) and the localization of its proteins as well as of three cohesins was analysed with isotropic resolution, providing new insights into their architecture and topography on a nanoscale level. This was done using immunofluorescence labelling in combination with super-resolution microscopy, line profiles and average position determination. The results show that the murine SC has a width of 221.6 nm ± 6.1 nm including a central region (CR) of 148.2 nm ± 2.6 nm. In the CR a multi-layered organization of the central element (CE) proteins was verified by measuring their strand diameters and strand distances and additionally by imaging potential anchoring sites of SYCP1 (synaptonemal complex protein 1) to the lateral elements (LEs). We were able to show that the two LEs proteins SYCP2 and SYCP3 do co-localize alongside their axis and that there is no significant preferential localization towards the inner LE axis of SYCP2.
The presented results also predict an orderly organization of murine cohesin complexes (CCs) alongside the chromosome axis in germ cells and support the hypothesis that cohesins in the CR of the SC function independent of CCs.
In the end new information on the molecular organization of two main components of the murine chromosome axis were retrieved with nanometer precision and previously unknown details of their molecular architecture and topography were unravelled.
Living apart together
(2002)
Cohesiveness between members of a social unit is a defining characteristic of animal social organization. Dispersed social organizations, where members of a social unit spend the main part of their activity period apart, have only recently been distinguished from cohesive social organizations and are still poorly understood with respect to their ecological basis and reproductive consequences. The general goal of this dissertation was to study the three components of the social system of fork-marked lemurs (Phaner furcifer), a small nocturnal primate from Madagascar living in dispersed pairs. First, I characterise their social organization, focusing on behavioural mechanisms of cohesion between pair partners. Second, through application of van Schaik's ecological model, I investigate predictions about the ecological basis of female intra-sexual avoidance, male-female social relationships and the determinants of differential female reproductive success. Finally, I analyse behavioural and genetic aspects of the mating system to test a recent hypothesis that proposes high extra-pair paternity in dispersed primate pairs resulting from constraints on male mate guarding. The study was conducted in Kirindy Forest in Madagascar between September 1998 and April 2001 during three field seasons for a total of 20 months. During more than 1400 hours of focal animal protocols, I sampled year-round data on space use, feeding ecology, time budgets, and social behaviour of all adults and three subadults of 8 families, complemented by simultaneous focal follows of both pair partners, year-round information on sleeping site use, measures on food abundance in each territory, morphological measurements, and DNA-microsatellite data for seven newly discovered polymorphic loci. Across eight social units and three breeding seasons, pairs were the prevailing grouping pattern (18 of 21 family years). Most pairs were stable for more than three mating seasons and used well defined stable territories. Although both pair partners used the same territory in a fairly similar fashion, average distance between pair partners was 100m, which was far considering that many territories measure only 200m in diameter. Pair partners spent only about 20% of activity time in less than 25m distance of each other and shared a sleeping site on average only every third day. Females were found to be dominant over their partner as well as over neighbouring males in all behavioural contexts. Most important food resources were exudates of a small number of tree species. Major food resources were distributed in small, defendable patches characterized by fast depletion and rapid renewal. In accordance with the ecological model, this led to strong within-group contest and scramble competition and weak between-group contest competition over food, as indicated by a positive dominance effect and a negative group size effect on female physical condition. Female reproductive success was determined mainly by family size. Paternity likelihood and exclusion analyses revealed that four out of seven offspring were most likely sired by an extra-pair male. Behaviour during the mating season implied that females as well as males take an active part in obtaining extra-pair copulations and that males try to guard their mates. Dispersed social organization in itself, i.e. low cohesion between pair partners, cannot explain high extra-pair paternity. I propose instead that several other factors common to most primates living in dispersed pairs constrain mate guarding and lead to high EPP. The ecological settings determine the mode of food competition and have shaped the social system of fork-marked lemurs in several ways. Intense within-group competition for food may have ultimately led to female intra-sexual avoidance and range exclusivity which represents an evolutionary precursor of pair-living. Although it remains elusive why females ultimately associated with single males, patterns of within-group contest competition for food explain why pair partners avoid each other during nocturnal activity. The limited number of food resources that is used in repetitive fashion and incomplete knowledge about the pair partners position explain why pair partners meet relatively often and why most encounters involve agonistic conflict. Rigid feeding itineraries characteristic of exudate feeders are likely to pose high costs to offspring dispersing to unfamiliar areas. Feeding ecology can, therefore, explain why parents tolerate delayed natal dispersal despite a negative effect on actual female reproductive success. In conclusion, the present study successfully applied existing socio-ecological theory to a new area of research, refined a recent evolutionary model and contributed important comparative data to our understanding of dispersed pairs in particular and primate and animal societies in general.
Ovarian cancer currently causes ~6,000 deaths per year in Germany alone. Since only palliative treatment is available for ovarian carcinomas that have developed resistance against platinum-based chemotherapy and paclitaxel, there is a pressing medical need for the development of new therapeutic approaches. As survival is strongly influenced by immunological parameters, immunotherapeutic strategies appear promising. The research of our group thus aims at overcoming tumour immune escape by counteracting immunosuppressive mechanisms in the tumour microenvironment. In this context, we found that tumour-infiltrating myeloid-derived suppressor cells (MDSC) or tumour associated macrophages (TAM) which are abundant in ovarian cancer express high levels of the enzyme 11β-hydroxysteroid dehydrogenase1 (11-HSD1). This oxido-reductase enzyme is essential for the conversion of biologically inactive cortisone into active cortisol. In line with this observation, high endogenous cortisol levels could be detected in serum, ascitic fluid and tumour exudates from ovarian cancer patients. Considering that cortisol exerts strong anti-inflammatory and immunosuppressive effects on immune cells, it appears likely that high endogenous cortisol levels contribute to immune escape in ovarian cancer. We thus hypothesised that local activation of endogenous glucocorticoids could suppress beneficial immune responses in the tumour microenvironment and thereby prevent a successful immunotherapy. To investigate the in vivo relevance of this postulated immune escape mechanism, irradiated PTENloxP/loxP loxP-Stop-loxP-krasG12D mice were reconstituted with hematopoietic stem cells from either glucocorticoid receptor (GR) expressing mice (GRloxP/loxP) or from mice with a T cell-specific glucocorticoid receptor knock-out (lck-Cre GRloxP/loxP) mice. In the host mice, the combination of a conditional PTEN knock-out with a latent oncogenic kras leads to tumour development when a Cre-encoding adenovirus is injected into the ovarian bursa. Using this model, mice that had been reconstituted with GC-insensitive T cells showed better intratumoural T cell infiltration than control mice that had received functionally unaltered GRloxP/loxP cells via adoptive transfer. However, tumour-infiltrating T cells mostly assumed a Foxp3+ (regulatory) phenotype and survival was even shortened in mice with cortisol-insensitive T cells. Thus, endogenous cortisol seems to inhibit immune cell infiltration in ovarian cancer, but productive anti-tumour immune responses might still be prevented by further factors from the tumour microenvironment. Thus, our data did not provide a sufficiently strong rationale to further pursue the antagonisation of glucocorticoid signalling in ovarian cancer patients, Moreover, glucocorticoids are frequently administered to cancer patients to reduce inflammation and swelling and to prevent chemotherapy-related toxic side effects like nausea or hypersensitivity reactions associated with paclitaxel therapy. Thus, we decided to address the question whether specific signalling pathways in innate immune cells, preferentially in NK cells, could still be activated even in the presence of GC. A careful investigation of the various activating NK cell receptors (i.e. NKp30, NKp44, NKp46), DNAM-1 and NKG2D) was thus performed which revealed that NKp30, NKp44 and NKG2D are all down-regulated by cortisol whereas NKp46 is actually induced by cortisol. Interestingly, NKp46 is the only known receptor that is strictly confined to NK cells. Its activation via crosslinking leads to cytokine release and activation of cytotoxic activity. Stimulation of NK cells via NKp46 may contribute to immune-mediated tumour destruction by triggering the lysis of tumour cells and by altering the cytokine pattern in the tumour microenvironment, thereby generating more favourable conditions for the recruitment of antigen-specific immune cells. Accordingly, our observation that even cortisol-treated NK cells can still be activated via NKp46 and CD2 might become valuable for the design of immunotherapies that can still be applied in the presence of endogenous or therapeutically administered glucocorticoids.