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Institute
- Graduate School of Life Sciences (787) (remove)
Sonstige beteiligte Institutionen
- Helmholtz Institute for RNA-based Infection Research (HIRI) (7)
- Rudolf Virchow Center for Integrative and Translational Bioimaging, University of Würzburg (2)
- Universitätsklinikum Münster (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)
- Carl-Ludwig-Institut für Physiologie, Universität Leipzig (1)
- Chair of Experimental Biomedicine I (1)
- DAAD - Deutscher Akademischer Austauschdienst (1)
The saprophytic filamentous fungus Aspergillus fumigatus has been gaining importance as an opportunistic human pathogen over the past decades. Advances in modern medicine have created a growing group of patients susceptible to infection with A. fumigatus, often contracting potentially deadly invasive aspergillosis. The virulence of this pathogen appears to be a multifactorial trait, a combination of physiological characteristics that enables the fungus to infect immunocompromised humans. This work concentrates on the nitrogen metabolism of A. fumigatus, which is essential for meeting the nutritional needs inside the human host. Using DNA microarrays, the transcriptional response during growth on three different secondary nitrogen sources was examined, which revealed the metabolic versatility of A. fumigatus, especially when challenged with proteins as the sole source of nitrogen. In-depth transcriptional profiling of the eight-member oligopeptide transporter (OPT) gene family underlined the importance of oligopeptide transport for growth on complex nitrogen sources like BSA or collagen. Heterologous expression of the opt genes in Saccharomyces cerevisiae showed their functionality as oligopeptide transporters, and characterized their substrate specificity. Using a Cre/loxP based genetic tool, a complete deletion of all opt genes in A. fumigatus was achieved. The resultant strain exhibited diminished growth on medium where the oligopeptide GPGG was the sole nitrogen source, but did not show any other in vitro phenotype. The opt deletion strain was not attenuated in virulence in a murine model of pulmonary aspergillosis, suggesting that the OPT gene family is not necessary for successful infection. The connection of oligopeptide transport and extracellular proteolytic activity was investigated by deleting the genes encoding Dpp4 and Dpp5, two dipeptidyl peptidases, or PrtT, the transcriptional regulator of major secreted proteases, in the complete opt deletion background. In contrast to the deletion of dpp4 and dpp5, which did not result in any additional phenotype, the absence of prtT led to a drastic growth defect on porcine lung agar. This suggests a synergistic action of extracellular proteolytic digest of proteins and transport of oligopeptide degradation products into the cell. Finally, this work established the bacterial β-Rec/six site-specific recombination system as a novel genetic tool for targeted gene deletion in A. fumigatus.
Reactive oxygen species (ROS) are continuously generated in cells and are involved in physiological processes including signal transduction but also their damaging effects on biological molecules have been well described. A number of reports in the literature implicate excessive oxidative stress and/or inadequate antioxidant defense in the pathogenesis of cancer, atherosclerosis, chronic and age related disorders. Several studies have indicated that activation of the renin-angiotensin-aldosterone-system can lead to the formation of ROS. Epidemiological studies have revealed higher renal cell cancer incidences and also higher cancer mortalities in hypertensive individuals. Recently, our group has shown that perfusion of the isolated mouse kidney with Ang II or treatment of several cell lines with Ang II leads to formation of DNA damage and oxidative base modifications. Here, we tried to scrutinize the pathway involved in genotoxicity of Ang II. We confirmed the genotoxicity of Ang II in two kidney cell lines of human origin. Ang II treatment led to the production of superoxide anions which we could hinder when we used the membrane permeable superoxide dismutase (SOD) mimetic TEMPOL. One of the enzymes which is activated in the cells after Ang II treatment and is able to produce ROS is NADPH oxidase. We demonstrated the activation of NADPH oxidase in response to Ang II by upregulation of its p47 subunit using RT-PCR. Also, pPhosphorylation of p47 subunit of NADPH oxidase after Ang II treatment was enhanced. Using two inhibitors we showed that NADPH oxidase inhibition completely prevents DNA damage by Ang II treatment. To differentiate between Nox2 and Nox4 isoforms of NADPH oxidase subunits in the genotoxicity of Ang II, we performed siRNA inhibition and found a role only for Nox4, while Nox2 was not involved. Next, we investigated PKC as a potential activator of NADPH oxidase. We showed that PKC becomes phosphorylated after Ang II treatment and also that inhibition of PKC hinders Ang II from damaging the cells. Our results from using several inhibitors of different parts of the pathway revealed that PKC activation in this pathway is dependent on the action of PLC on membrane phospholipids and production of IP3. IP3 binds to its receptor at endoplasmic reticulum (ER), opening a channel which allows calcium efflux into the cytoplasm. In this manner, both ER calcium stores and extracellular calcium cooperate so that Ang II can exert its genotoxic effect. PLC is activated by AT1R stimulation. We could also show that the genotoxicity of Ang II is mediated via AT1R signaling using the AT1R antagonist candesartan. In conclusion, here we have shown that Ang II is able to damage genomic damage in cell lines of kidney origin. The observed damage is associated with production of ROS. A decrease in Ang II-induced DNA damage was observed after inhibition of G-proteins, PLC, PKC and NADPH oxidase and interfering with intra- as well as extracellular calcium signaling. This leads to the following preliminary model of signaling in Ang II-induced DNA damage: binding of Ang II to the AT1 receptor activates PLC via stimulation of G-proteins, resulting in the activation of PKC in a calcium dependent manner which in turn, activates NADPH oxidase. NADPH oxidase with involvement of its Nox4 subunit then produces reactive oxygen species which cause DNA damage. Dopamine content and metabolism in the peripheral lymphocytes of PD patients are influenced by L-Dopa administration. The PD patients receiving a high dose of L-Dopa show a significantly higher content of dopamine in their lymphocytes compared to PD patients who received a low dose of L-Dopa or the healthy control. Central to many of the processes involved in oxidative stress and oxidative damage in PD are the actions of monoamine oxidase (MAO), the enzyme which is responsible for the enzymatic oxidation of dopamine which leadsing to production of H2O2 as a by-product. We investigated whether dopamine oxidation can cause genotoxicity in lymphocytes of PD patents who were under high dose L-Dopa therapy and afterward questioned the occurrence of DNA damage after dopamine treatment in vitro and tried to reveal the mechanism by which dopamine exerts its genotoxic effect. The frequency of micronuclei in peripheral blood lymphocytes of the PD patients was not elevated compared to healthy age-matched individuals, although the formation of micronuclei revealed a positive correlation with the daily dose of L-Dopa administration in patients who received L-Dopa therapy together with dopamine receptor agonists. In vitro, we describe an induction of genomic damage detected as micronucleus formation by low micromolar concentrations in cell lines with of different tissue origins. The genotoxic effect of dopamine was reduced by addition of the antioxidants TEMPOL and dimethylthiourea which proved the involvement of ROS production in dopamine-induced DNA damage. To determine whether oxidation of dopamine by MAO is relevant in its genotoxicity, we inhibited MAO with two inhibitors, trans-2-phenylcyclopropylamine hydrochloride (PCPA) and Ro 16-6491 which both reduced the formation of micronuclei in PC-12 cells. We also studied the role of the dopamine transporter (DAT) and dopamine type 2 receptor (D2R) signaling in the genotoxicity of dopamine. Inhibitors of the DAT, GBR-12909 and nomifensine, hindered dopamine-induced genotoxicity. These results were confirmed by treatment of MDCK and MDCK-DAT cells, the latter containing the human DAT gene, with dopamine. Only MDCK-DAT cells showed elevated chromosomal damage and dopamine uptake. Although stimulation of D2R with quinpirole in the absence of dopamine did not induce genotoxicity in PC-12 cells, interference with D2R signaling using D2R antagonist and inhibition of G-proteins, phosphoinositide 3 kinase and extracellular signal-regulated kinases reduced dopamine-induced genotoxicity and affected the ability of DAT to take up dopamine. Furthermore, the D2R antagonist sulpiride inhibited the dopamine-induced migration of DAT from cytosol to cell membrane. Overall, the neurotransmitter dopamine causes DNA damage and oxidative stress in vitro. There are also indications that high dose L-Dopa therapy might lead to oxidative stress. Dopamine exerts its genotoxicity in vitro upon transport into the cells and oxidization oxidation by MAO. Transport of dopamine by DAT has the central role in this process. D2R signaling is involved in the genotoxicity of dopamine by affecting activation and cell surface expression of DAT and hence modulating dopamine uptake. We provided evidences for receptor-mediated genotoxicity of two compounds with different mechanism of actions. The involvement of these receptors in many human complications urges more investigations to reveal whether abnormalities in the endogenous compounds-mediated signaling can play a role in the initiation of new conditions like carcinogenesis.
The genus Borrelia belongs to the Spirochaetes phylum which is far related to Gram negative bacteria. This phylum possesses a characteristic long helically coiled shape with lengths that vary from 5 to 250 μm. Other pathogens as Treponema and Leptospira which cause syphilis and leptospirosis, also belong to the Spirochaetes. Borrelia itself is the causative agent of two human diseases, the Lyme disease and relapsing fever. Borreliae are pathogenic bacteria which cycle between their arthropod vector, in most cases a tick, and a mammal host, very often small rodents. This complex life cycle requires an extraordinary protein up- and down-regulation in order to survive in such different organisms and avoid their immunologic systems. Lyme disease is a multisystemic disease that can affect different organs like skin, joints and nervous system. A red rash with concentric rings, called erythema migrans is a distinctive manifestation that allows clinical diagnosis. It appears after the bite of an infected tick and spreads out to diameters that can reach 15 cm. Relapsing fever is characterized by sudden recurrent fever peaks accompanied with chills, headache, muscle and joint pain and nausea. Both diseases are easily treated with antibiotics in early infection stages. Borrelia species possess a small genome. Many of their genes are related with virulence and the adaptation to the different hosts. The absence of genes in Borrelia involved in the biosynthesis of amino acids, fatty acids or nucleotide is very remarkable. This metabolic deficiency makes Borrelia species dependent on substances produced by the host. The first step in nutrient uptake is accomplished by porins. Bacterial porins are water-filled channels that facilitate the transport of essential molecules through the outer membrane. Four porins have been described in Borrelia up to this point. P66, P13 and Oms28 have been found in Borrelia burgdorferi while Oms38 was discovered in relapsing fever spirochetes. P66 is a singular porin with an extremely high single channel conductance of 11 nS. P13 is a small protein with an α-helical secondary structure which does not fit into the general porin model. The function of Oms28 as a porin has been questioned recently due to its periplasmic membrane-associated location. Finally, Oms38 is a specific porin for dicarboxilates with homologues in Lyme disease species. The aim of this thesis was to broaden the knowledge of the P66 and P13 porins described in the genus Borrelia. Both differ in structure and size from the general Gram negative porin model and could be highly involved in specific tasks in the genus Borrelia. In the first project of this thesis, the presence and pore forming capacity of P66 was studied in several Borrelia species including members of the relapsing fever group. P66 is the best studied porin in Borrelia with a dual function as porin and adhesin. This knowledge is restricted to B. burgdorferi and little or nothing is known about homologues in other Borrelia species. Therefore, three Lyme disease and three relapsing fever species were chosen as representative agents of the genus and the pore forming activity of their P66 homologues was studied. Five out of the six homologues exhibited a similar single channel conductance in a range from 9 to 11 nS. All of them showed no selectivity for cations or anions, and they were voltage dependent starting at different voltages from 30 to 70 mV. Only in the case of the B. hermsii homologue no pore forming activity could be established. It remains unclear if the lack of activity was due to an evolutionary loss of its porin function or to a higher sensibility to the detergents used for purification. In another project, the controversial P66 pore diameter of B. burgdorferi was analyzed with an empirical method. In a former study, the diameter of the P66 channel was estimated to be 2.6 nm based on theoretical considerations. This diameter is rather large and could impair the outer membrane protective function. Different non-electrolytes were used to study the P66 pore diameter indicating a 1.8 nm entrance diameter and a 0.8 nm inner constriction. In addition, the blockage of the channel with some of those non-electrolytes disclosed an oligomeric organization formed by approximately eight independent channels. Such a structure has not been observed so far in any other living organism and could be exclusive of Borrelia or spirochetes. The third project of this thesis deal with the recombinant production of a B. burgdorferi protein with immunogenic potential. This protein might be used to develop new diagnosis tests and therapeutic treatments. P13 is an outer membrane protein present in LD and RF species and it does not have any other known bacterial homologue. These facts make of P13 a good candidate to be used as a therapeutic target. For such purpose, P13 was cloned in two organisms. First, in Escherichia coli were two different constructs were designed to establish the role of a periplasmic cleaved C-terminus. Second, in a virus based vector delivered by Agrobacterium tumefaciens into tobacco plant cells. The vector replicates inside the plant cells spreading the infection to adjacent cells and at the same time producing the recombinant protein. This second expression method should enable the production of large amounts of the recombinant protein reducing time and costs. The last project of this thesis looked into the outer membrane complexome of B. burgdorferi focusing on the P13 and P66 porin complexes. Blue Native Page and second dimension SDS Page were the technique chosen for this purpose. P66 could be shown to be the only protein involved in the formation of the 11 nS pore which complex is probably formed by eight monomers. It was also possible to divide this complex in two halves with approximately half the molecular weight and a conductance of 5.5 nS. In the case of the P13 complex, a possible association with the lipoprotein OspC was revealed. The gel extraction of the P13 complex and its test with the Back Lipid Bilayer assay exhibited a 0.6 nS activity. This is in high contrast with the 3.5 nS activity previously described for this protein. To sum up, P66 is a porin present in many Borrelia species including not only LD but also RF species and which homologues show similar biophysical properties. The diameter of this pore is smaller than previously thought and it has molecular weight sieving properties. In the case of P13, its recombinant procurement will allow the use of P13 as a diagnostic and therapeutic target. The possible association with OspC could facilitate to unravel in future experiments the function of this intriguing protein.
Semaphorin receptors in the immunological synapse: regulation and measles virus-driven modulation
(2010)
Measles virus (MV) infection causes approximately 164,000 deaths per year worldwide (WHO, 2008). The main cause of death is MV-induced immunosuppression but the underlying mechanisms are not fully understood. It has been suggested that MV renders T cells dysfunctional by disrupting the integrity of actin dynamics while MV infection of dendritic cells results in their inability to sustain T cell activation. During neuronal development, semaphorins (SEMAs), especially SEMA3A, induce a collapse of growing dendrites via the binding to plexin-A1 (plexA1) and its coreceptor neuropilin-1 (NP-1). The collapse results from a disruption of actin dynamics. In this study, the roles of these three molecules were investigated in human immune cells and their possible role in MV induced immunosuppression. The present data have shown that plexA1 is an important component of human immunological synapse (IS). It translocated transiently to the surface of T cells after CD3/28 ligation and accumulated at the stimulatory interface between T cells and DCs (or CD3/28 coated beads). When plexA1 expression was inhibited (RNAi) or its function was disrupted (exogenous blocking or dominant negative expression), T cell expansion was reduced. Upon MV exposure, translocation of plexA1 and NP-1, another important component of IS, towards the stimulatory interface in T cells was abrogated. Moreover, MV infection interfered with plexA1/NP-1 turnover in maturing DCs and promoted early and substantial release of SEMA3A from these cells, particularly in the presence of allogenic T cells. As revealed by scanning electron microscopy, the release of SEMA3A caused a transient loss of actin-based protrusions on T cells. SEMA3A affected chemotactic migration of T cells and DCs, and reduced formation of allogenic DC/T cell conjugates. In conclusion, MV targeted SEMA receptor function both by disrupting their recruitment to the IS and by promoting a premature release of their repulsive ligand, SEMA3A. Both of which could contribute to MV-induced immunosuppression.
Stem cells with the particular potential to self renew and to differentiate into multiple cell lineages are fascinating cell types for basic and applied research. Pluripotent embryonic stem (ES) cells are derived from the inner cell mass (ICM) of preimplantation embryos. Upon differentiation ES cells can give rise to cells of ecto-, meso- and endoderm including germ cells. In contrast, multipotent adult stem cells are more restricted in their differentiation outcomes,they differentiate into cells of their tissue of origin. For example, hematopoietic stem cells (HSCs) that reside in hemogenic tissues such as the bone marrow (BM) differentiate into hemato-/lymphoid cell lineages. Upon differentiation of stem cells not the genome, but the epigenetic regulation changes. Differentiation-associated epigenetic changes generate cell types with distinct phenotypes and functions. For stem cell-based therapies it is important to deeper understand the relation between epigenome and cellular function. In the scope of this thesis I aimed to analyze cultures of differentiating stem cells with respect to gene expression, chromatin regulation and differentiation potential. For the analysis of global histone modification levels, which represent one mechanism for epigenetic regulation, fow cytometric protocols were established that allow single cell measurements. By applying this methodology decreased histone acetylation levels were shown in differentiated ES cell populations. In contrast, comparable histone acetylation levels were observed in differentiated and undifferentiated BM cells. In addition, I investigated effects of the histone deacetylase (HDAC) inhibitor trichostatin A (TSA) on murine BM cells, comprising also HSCs. Upon TSA treatment the frequency of cells with in vitro and in vivo hematopoietic activity was increased, while lineage committed cells underwent apoptosis. Next, the loss of pluripotency was assessed in differentiating ES cell cultures. Using short-term in vitro differentiation protocols marker-based analyses and functional assays were performed.Functionally pluripotency was diminished after 2 days of differentiation as assessed by colony formation, embryoid body (EB) formation and cardiomyogenic differentiation approaches. In contrast, pluripotency marker expression was reduced at later time points. Further, the application of distinct differentiation systems (aggregation EB, clonal EB or monolayer (ML) culture) had an impact on the progression and homogeneity of differentiation cultures. To further study the end of pluripotency, differentiated ES cells were placed under ES cell culture conditions. The data suggest that 3 days differentiated ES cells had passed a point of no return and failed to regain Oct4-eGFP expression and that HDAC inhibitor treatment selectively killed differentiated ES cells. Finally, I aimed to study the effect of EED - a core subunit of the histone methylating Polycomb repressive complex 2 (PRC2) - on ES cell chromatin and function. ES cells lacking EED showed loss of histone H3 lysine 27 trimethylation (H3K27me3) accompanied by increased histone acetylation and reduced H3K9me3 levels. Despite typical ES cell morphology and pluripotency marker expression, EED knockout (KO) ES cells exhibited altered nuclear heterochromatin organization, delayed chromatin mobility and a failure in proper differentiation. Conclusively, my data provide insights into the epigenetic regulation of stem cells. Particularly, the results suggest that HDAC inhibitor treatment was detrimental for differentiated BM as well as for differentiated ES cells and that ES cells after 3 days of differentiation had lost pluripotency. Further, the data demonstrate that EED KO ES cells self renewed, exhibited morphology and pluripotency marker expression similar to wild type ES cells, but failed to differentiate. This indicates an important role of EED not only for undifferentiated but also for differentiating ES cells.
This thesis is divided into three parts with the main goal allocating novel antimicrobial compounds that could be used as future antibiotics. The first part aimed to evaluate the potential of plant suspension cultures for the production of antimicrobial proteins. The extracellular, intracellular and cell wall bound fractions of seven heterotrophic and photomixotrophic plant cell suspension cultures treated with nine different elicitors were tested for the elicitor dependent production of antimicrobial proteins. Bioactivities were tested against a selected panel of human isolates including Gram-positive and Gram-negative bacteria as well as fungi using the disc diffusion assay. The intracellular fractions of elicited cell cultures were more active than extracellular fractions while the cell wall bound fractions showed lowest activities. Among the 21 fractions tested, the intracellular fraction of Lavendula angustifolia elicited with DC3000 was most active against Candida maltosa. The second most active fraction was the intracellular fraction of Arabidopsis thaliana elicited with salicylic acid which was moreover active against all test strains. The antimicrobial activity of elicited Arabidopsis thaliana cell cultures was tested by bioautography to locate the antimicrobial proteins in the crude extract. The intracellular fraction of photomixotrophic Arabidopsis thaliana cells elicited with salicylic acid was selected for further gel filtration chromatography on S-200 column leading to the purification of one 19 kDa antimicrobially active protein, designated, AtAMP. Our findings suggest that elicited plant cell cultures may present a new promising alternative source of antimicrobial proteins. The second part comprises the isolation of actinomycetes associated with marine sponges and testing the bioactivities of new species for further investigations. Actinobacterial communities of eleven taxonomically different sponges that had been collected from offshore Ras Mohamed (Egypt) and from Rovinj (Croatia) were investigated by a culture-based approach using different standard media for isolation of actinomycetes and media enriched with aqueous sponge extract to target rare and new actinomycete species. Phylogenetic characterization of 52 representative isolates out of 90 based on almost complete sequences of genes encoding 16S rRNA supported their assignment to 18 different actinomycete genera. Altogether 14 putatively new species were identified based on sequence similarity values below 98.2% to other strains in the NCBI database. The use of M1 agar amended with aqueous sponge extract yielded a putative new genus related to Rubrobacter which highlighting the need for innovative cultivation protocols. Biological activity testing showed that five isolates were active against Gram-positives only, one isolate was active against Candida albicans only and one isolate showed activity against both groups of pathogens. Moreover, the antiparasistic activity was documented for four isolates. These results showed a high diversity of actinomycetes associated with marine sponges as well as highlighted their potential to produce anti-infective agents. The third part of the thesis focused on the isolation and structure elucidation of new bioactive compounds. Streptomyces strain RV15 recovered from sponge Dysidea tupha, was selected for further chemical analysis by virtue of the fact that it exhibited the greatest antimicrobial potential against Staphylococcus aureus as well as Candida albicans among the all tested strains. Moreover, members of the genus Streptomyces are well known as prolific producers of interesting pharmacologically active metabolites. Chemical analysis of the methanolic crude extract using different chromatographic tools yielded four new compounds. The structures of the new compounds were spectroscopically elucidated to be four new cyclic peptides, namely, cyclodysidins A-D. Their bioactivity was tested against different proteases, bacteria and Candida as well as tumor cell lines. The compounds did not show any significant activities at this point.
Characterization of tolerogenic rat bone marrow-derived dendritic cells and regulatory T cells
(2010)
Tolerogenic dendritic cells (DC) and regulatory T (Treg) cells are able to prevent destructive immune responses. There is reason to hope that it may soon be possible to use DC and Treg cells to suppress immune responses antigen-specific, not only after transplantation, but also in the case of autoimmunity and allergy. At the moment, the generation of such cell types is very time-consuming and not suitable for clinical routine. In addition, it is not yet fully understood how these cells elicit a desired protective immune response in vivo and how the risks of an excessive immune suppression can be managed. The rat is one of the most important animal models in biomedical research. It is therefore surprising that tolerogenic DC and Treg cells in particular have not been more thoroughly investigated in this model. Thus, the aim of the present study was to systematically characterize these immune cells and investigate their impact on the immune system. Tolerogenic DC were generated from bone marrow precursors cultured with GM-CSF and IL-4 (= IL-4 DC). The proportion of naturally occurring Treg cells with a CD4posCD25posFoxp3pos phenotype comprises approximately 5-8% of the peripheral CD4pos T cells. The characterization of IL-4 DC revealed an up to 26-fold reduced expression of surface molecules such as MHC class II molecules, CD80, CD86, ICAM-1 and CD25 in comparison to mature splenic DC (S-DC). This low expression did not change when the cells where stimulated with different maturation-inducing signals such as replating, LPS, TNF- α and CD40L. Thus, these cells possess a robust phenotype resistant to maturation-inducing stimuli. IL-4 DC take up antigen via endocytosis and are not able to activate naïve T cells or to restimulate antigen-specific T cells. Furthermore, they are able to inhibit and prolongate mature S-DC induced T cell proliferation as well as mature S-DC induced restimulation of antigen-specific T cells, respectively. Thereby, the T cell proliferation was reduced up to 95%. This strong inhibitory effect was mediated within 24 hours in association with a reduced cytokine production (IL-2 about 49% and IFN-γ about 92%). The inhibitory properties of IL-4 DC don´t seem to be caused exclusively by the reduced expression of co-stimulatory molecules. In this study, the detection of the inhibitory molecules PD-L1 and PD-L2 on IL-4 DC suggests they have an impact on mediating inhibitory signals to the T cells. In addition, a suppressive effect of soluble factors was shown. The supernatant of one million IL-4 DC, collected after a 24 hour culture, suppressed mature S-DC induced proliferation of naïve T cells by about 90%. TGF-β, which was detected in the supernatant (up to 300 pg/ml), appears to be the causing soluble factor for this immune inhibition. By contrast, the supernatants of mature S-DC, which did not inhibit the activation of T cells, showed a TGF-β concentration of only about 100 pg/ml. The cytotoxic nitric oxide does not contribute to the IL-4 DC-mediated inhibition of T cell proliferation. The NO synthase inhibitor NMMA reduced the amount of NO by about 50%, but the decreased NO levels did not influence T cell proliferation. Indeed, IL-4 DC are not able to induce T cell proliferation, but this doesn´t mean that there is no change on the molecular level. For instance, T cells co-cultured with IL-4 DC during a first culture are not able to proliferate in the presence of mature S-DC during a second culture. This anergic-like state, however, could be abolished by adding exogenous IL-2. In addition, T cells co-cultured with IL-4 DC are able to inhibit the activation of naïve T cells. Naïve and activated T cells were not able to inhibit the mature S-DC induced T cell proliferation. This observation suggests the induction of Treg cells and was investigated in more detail. Indeed, flow cytometric analysis showed a 1.6-fold expansion of CD4posCD25posFoxp3pos T cells from naturally occurring Treg cells in the presence of IL-4 DC. Thereby, the expansion of CD4posCD25posFoxp3pos T cells occurs independently of the maturation state of DC. Both immature IL-4 DC as well as mature S-DC were able to expand the percentage of naturally occurring Treg cells. However, Treg cells pre-incubated with mature S-DC demonstrated a diminished inhibitory effect compared to Treg cells pre-incubated with IL-4 DC. Treg cells pre-incubated with IL-4 DC were able to inhibit the activation of naïve T cells. In this study it was shown that the regulatory potential of DC cannot be deduced solely by their phenotype or maturation state. Other factors, such as functional properties, need to taken into consideration, too. The induction of Treg cells with suppressive properties induced by in vitro generated tolerogenic IL-4 DC might provide an important mechanism for the maintenance of peripheral tolerance. However, for clinical application further investigation is necessary, not only to understand the interactions between tolerogenic DC and Treg cells, but also to investigate the impact of the transfer of a larger quantity of regulatory cells on the immune system of the recipient.
Resin, a sticky sap emitting terpenoids and other volatiles, is produced by various plant species to seal wounds and protect themselves against herbivores and microbes. Among several other insects, bees have evolved the surprising ability to handle the repellent plant sap and use it to construct and defend their nests. Whereas the collection of pollen and nectar has been intensively studied in bees, resin collection has received only little attention. The aim of this dissertation was to better understand how the physiological and chemical properties of resin and resin-derived compounds (terpenes) affect the ecology of stingless bees. I therefore asked why, where and how stingless bees of Borneo (seven study-species), Australia (eight) and Costa Rica (27) collect and process plant resins, addressing the importance of a largely neglected resource not only for building and defensive properties, but also for the bees’ chemical diversity. Stingless bees are highly opportunistic resin foragers with all species collecting resin from a similar set of tree species. They locate and/or recognize resin sources on the basis of several volatile mono- and sesquiterpenes. I found that different bee species and even colonies significantly varied in the amount of resin collected. Predator attack (e.g., by ants) had the strongest affect on resin intake, whereas manual nest destruction only slightly increased the number of resin foragers. Resin is used to build, maintain and defend nests, but also as source for chemical compounds (terpenes) which stingless bees include in their surface profiles (chemical profiles). They directly transfer resin-derived compounds to their body surfaces (cuticular terpenes), but only include a subset (8 %) of the large number (>> 1000) of terpenes found in tree resins. This phenomenon can only be explained by a hitherto unknown ability to filter environmentally derived compounds which results in species-specific terpene profiles and thus in an increased chemical heterogeneity among species. Moreover, due to the addition of resin-derived substances the diversity of compounds on the bees’ body surfaces by far exceeds the chemical diversity of profiles in other hymenopterans. Because stingless bees filter but do not modify resin-derived compounds, species from Borneo, Australia and Costa Rica all resemble the characteristic resin of typical trees in their regions of origin. This chemical similarity reveals a strong correlation between the diversity of tree resins and the diversity of cuticular terpenes among stingless bees in a given habitat. Because different tree species are found in different tropical regions, the chemical composition of tree resins varies between tropical regions as does the composition of cuticular terpenes in bee species from these regions. Cuticular terpenes are however most common among stingless from Borneo, with 100 % of species studied having resin-derived terpenes in their chemical profiles. They are least common in Costa Rica, with only 40 % of species having terpenes. Likewise, resin collection was found to be highest in Tetragonilla collina colonies of Borneo where occasionally up to 90 % of foragers collected resin. By contrast, resin collection was only performed by 10 % of foragers of a given colony in Australia and by a maximum of 40 % in Costa Rica. The dominance of resin and resin-derived compounds in the chemical ecology of bees from Borneo may mirror the dominance of a particular Southeast Asian tree family: the highly resinous dipterocarps. Such a correlation between the chemistry of bees and the chemistry of tree resins therefore underlines the close relationship between stingless bees and the trees of their habitat. Cuticular terpenes are assumed to protect bees against predators and/or microbes. Sesquiterpenes, a specific group of terpenes, most vary between species and impair inter-specific aggression by reducing aggressive behavior in species without sesquiterpenes, thereby providing a novel mechanism to achieve interspecific tolerance among insects. Reduced interspecific aggression may also be an important factor enabling the non-aggressive aggregation of nests from stingless bee colonies of up to four different species, because such aggregations frequently comprise both species with and species without sesquiterpenes. Given its various functions, resin represents a highly important resource for stingless bees which directly affects their chemical ecology, defensive properties and inter-specific communication. It remains to be investigated how the bees influence the resin-derived terpene profiles on their body surface and in their nests, particularly how they manage to exclude entire groups of terpenes. Whether bees actually need a high diversity of different resin sources and therefore tree species to maintain the homeostasis of their colonies or whether they would do equally well with a limited amount of resin sources available, should also be addressed in future studies. Answers to this question will directly impair bee and forest management in (sub)tropical regions.
The aim of this project was to investigate whether reflex-like innate facial reactions to tastes and odors are altered in patients with eating disorders. Qualitatively different tastes and odors have been found to elicit specific facial expressions in newborns. This specificity in newborns is characterized by positive facial reactions in response to pleasant stimuli and by negative facial reactions in response to unpleasant stimuli. It is, however, unclear, whether these specific facial displays remain stable during ontogeny (1). Despite the fact that several studies had shown that taste-and odor-elicited facial reactions remain quite stable across a human’s life-span, the specificity of research questions, as well as different research methods, allow only limited comparisons between studies. Moreover, the gustofacial response patterns might be altered in pathological eating behavior (2). To date, however, the question of whether dysfunctional eating behavior might alter facial activity in response to tastes and odors has not been addressed. Furthermore, changes in facial activity might be linked to deficient inhibitory facial control (3). To investigate these three research questions, facial reactions in response to tastes and odors were assessed. Facial reactions were analyzed using the Facial Action Coding System (FACS, Ekman & Friesen, 1978; Ekman, Friesen, & Hager, 2002) and electromyography.
Integrating neurobiological markers of depression: an fMRI-based pattern classification approach
(2010)
While depressive disorders are, to date, diagnosed based on behavioral symptoms and course of illness, the interest in neurobiological markers of psychiatric disorders has grown substantially in recent years. However, current classification approaches are mainly based on data from a single biomarker, making it difficult to predict diseases such as depression which are characterized by a complex pattern of symptoms. Accordingly, none of the previously investigated single biomarkers has shown sufficient predictive power for practical application. In this work, we therefore propose an algorithm which integrates neuroimaging data associated with multiple, symptom-related neural processes relevant in depression to improve classification accuracy. First, we identified the core-symptoms of depression from standard classification systems. Then, we designed and conducted three experimental paradigms probing psychological processes known to be related to these symptoms using functional Magnetic Resonance Imaging. In order to integrate the resulting 12 high-dimensional biomarkers, we developed a multi-source pattern recognition algorithm based on a combination of Gaussian Process Classifiers and decision trees. Applying this approach to a group of 30 healthy controls and 30 depressive in-patients who were on a variety of medications and displayed varying degrees of symptom-severity allowed for high-accuracy single-subject classification. Specifically, integrating biomarkers yielded an accuracy of 83% while the best of the 12 single biomarkers alone classified a significantly lower number of subjects (72%) correctly. Thus, integrated biomarker-based classification of a heterogeneous, real-life sample resulted in accuracy comparable to the highest ever achieved in previous single biomarker research. Furthermore, investigation of the final prediction model revealed that neural activation during the processing of neutral facial expressions, large rewards, and safety cues is most relevant for over-all classification. We conclude that combining brain activation related to the core-symptoms of depression using the multi-source pattern classification approach developed in this work substantially increases classification accuracy while providing a sparse relational biomarker-model for future prediction.