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The charge transport properties of disordered organic and nanocrystalline inorganic semiconductors as well as their combinations have been investigated in regard to the charge carrier density employing field-effect-transistor structures. The results were discussed in the framework of different theoretical models. In organic semiconductors the presence of positional and energetic disorder determines the transport of charges through the respective thin films and interfaces. The electronic disorder is characterized by statistically distributed and localized transport sites which were shown to form a Gaussian density of states. In this electronic environment the charge transport occurs via thermally activated hopping between the localized states and therefore depends on the temperature and the local electric field. Particularly, a dependence of the carrier mobility on the charge carrier concentration is observed due to filling of tail states. Inorganic nanocrystalline semiconductors, however, are expected to present a different electronic structure: Within the volume of a nanocrystallite the semiconductor is assumed to reflect the electronic properties of the crystalline bulk material. However, the outer shell is characterized by a relatively large density of surface states and correspondingly bending of the energy bands, which creates an energetic barrier between the adjacent particles. In a nanocrystalline thin film this characteristic can be rate-limiting for the inter-particle carrier transport as reflected by reduced charge carrier mobility. The effective barrier height can be reduced by controlled doping of the nanocrystals which results in improved majority carrier transfer rates across the barrier. However, doping results in the simultaneous increase of the defect density and consequently to enhanced limitation of the mobility due to charge carrier scattering. In the experiments, thin films of commercially available p- and n-type organic semiconductors (P3HT, and two derivatives of PCBM) were investigated in field-effect transistor structures. Further, sol-gel synthesized n-type nanocrystalline-ZnO (nc-ZnO) with varied doping concentration (agent: aluminum Al$^{3+}$) was introduced in order to establish an alternative way of customizing the charge transport properties of the neat material and in combination with the organic polymer semiconductor P3HT.
The contribution of the present thesis consists of three parts. They are centered around investigating certain semiconductor heterointerfaces relevant to spin injection, exploring novel, diluted magnetic single barrier tunneling structures, and further developing diluted magnetic II-VI resonant tunneling diodes.
Investigation on Distinct Roles of Smad Proteins in Mediating Bone Morphogenetic Proteins Signals
(2011)
Bone morphogenetic proteins (BMPs) belong to the transforming growth factor-β (TGF-β) superfamily and play important roles in numerous biological events in the development of almost all multi-cellular organisms. Dysregulated BMP signaling is the underlying causes of numerous heritable and non-heritable human diseases including cancer. The vast range of biological responses induced by BMPs converges on three closely related Smad proteins that convey intracellular signals from BMP receptors to the nucleus. The specificity of BMP signaling has been intensively investigated at the level of ligand-receptor interactions, but how the different Smad proteins contribute to differential signals elicited by BMPs remains unclear. In this work, we investigated the BMP/Smad signaling in different aspects. In search for an appropriate fluorescence reporter in zebrafish, we compared different photo-switchable proteins and found EosFP the best candidate this model system for its fast maturation and fluorescence intensity. We modified and created appropriate vectors enabling Tol2-transposon based trangenesis in zebrafish, with which transgenic zebrafish lines were generated. We combined fluorescence protein tagging with high resolution microscopy and investigate the dynamics of Smad proteins in model system zebrafish. We observed that Smad5 undergoes nucleo-translocation as BMP signal transmitter during zebrafish gastrulation. We explored the Smad involvement during myogenic-to-osteogenic conversion of C2C12 cell line induced by BMP4. We created transient loss-of-function of Smads by siRNA-mediated knockdowns and analyzed the effects on these coupled yet distinct procedures by quantitative real-time PCR and terminal marker staining. We found that different Smad-complex stoichiometry might be responsible for distinct cellular signals elicited by BMPs.
A major goal of the main topics of ecology is to answer the question of how species can co-exist and maintain biodiversity. To understand how community dynamics operate in different spatio-temporal dimensions to govern biodiversity patterns requires a process-based knowledge. Thus, this study focused primarily on biodiversity patterns and ecological processes at both spatial and temporal scales. Spatially, the diversity and similarity of spider communities in high, intermediate, and low strata of beech trees represented a set of age-related effects: Old-growth trees provided unique and distinct resources to spiders and in turn possessed discrete spider compositions. Intra-annually, spider communities in different seasons showed a repeated, predictable temporal dynamics. Inter-annually, comparison revealed that neutral and niche models can operate in tandem, and that both are needed to fully explain the dynamics of arboreal spider assemblages among different canopy strata in this beech forest.
Despite the internet's dynamic and collaborative nature, scientists continue to produce grant proposals, lab notebooks, data files, conclusions etc. that stay in static formats or are not published online and therefore not always easily accessible to the interested public. Because of limited adoption of tools that seamlessly integrate all aspects of a research project (conception, data generation, data evaluation, peerreviewing and publishing of conclusions), much effort is later spent on reproducing or reformatting individual entities before they can be repurposed independently or as parts of articles.
We propose that workflows - performed both individually and collaboratively - could potentially become more efficient if all steps of the research cycle were coherently represented online and the underlying data were formatted, annotated and licensed for reuse. Such a system would accelerate the process of taking projects from conception to publication stages and allow for continuous updating of the data sets and their interpretation as well as their integration into other independent projects.
A major advantage of such work ows is the increased transparency, both with respect to the scientific process as to the contribution of each participant. The latter point is important from a perspective of motivation, as it enables the allocation of reputation, which creates incentives for scientists to contribute to projects. Such work ow platforms offering possibilities to fine-tune the accessibility of their content could gradually pave the path from the current static mode of research presentation into a more coherent practice of open science.
Cell adhesion and migration are essential for development and homeostasis. Adhesion to the extracellular matrix occurs at specialized plasma membrane domains where transmembrane adhesion receptors, signaling proteins such as kinases and phosphatases, and a large number of adaptor proteins interact with the cytoskeleton in a tightly regulated and synchronized fashion. Whereas altered cell adhesion and migration are known to be important in cardiovascular disease and malignant tumors, the target proteins and molecular interactions that regulate these complex processes still remain incompletely understood. Whereas numerous kinases are known to regulate cell adhesion dynamics, information about the involved protein phosphatases is still very limited. A newly emerging phosphatase family contains the unconventional active site sequence DXDX(T/V) and belongs to the haloacid dehalogenase (HAD) superfamily of hydrolases. Our laboratory has recently discovered AUM, a novel phosphatase that belongs to this poorly characterized enzyme family. Initial findings pointed toward a potential involvement of AUM in the regulation of cell adhesion to the extracellular matrix. The objective of the present study was to study the potential role of AUM in cell adhesion. We could show that cells stably depleted of AUM are characterized by accelerated adhesion on immobilized fibronectin. To confirm these findings, we used an siRNA-based approach for the acute depletion of AUM and observed a similar phenomenon. Rescue experiments were performed with stably AUM-depleted cells to ensure that the above mentioned effects are indeed AUM specific. We observed that the re-addition of AUM normalizes cellular adhesion kinetics on fibronectin. These results clearly show that AUM exerts important functions in cell-matrix adhesion. To investigate the molecular basis of these effects, we have characterized integrin expression patterns using flow cytometry. Interestingly, fibronectin-stimulated AUM-depleted cells are characterized by an increase in the cell surface expression of conformationally active 1-integrins. Consistent with the important role of 1-integrins in the regulation of RhoA activity, we also observed a specific increase in RhoA-GTP, but not Rac1-GTP-levels during cell adhesion to fibronectin. Consistent with these findings and with the important role of RhoA for focal adhesion maturation, AUM depleted cells showed more elongated and more centripetally oriented focal adhesions as compared to control cells when spread on fibronectin. Taken together, this study has revealed an important role of AUM for cell-matrix adhesion. Our findings strongly suggest that AUM functions as a negative regulator of 1-integrins and RhoA-dependent cytoskeletal dynamics during cell adhesion.
Dilated cardiomyopathy (DCM) represents an important subgroup of patients suffering from heart failure. The disease is supposed to be associated with autoimmune mechanisms in about one third of the cases. In the latter patients functionally active conformational autoantibodies directed against the second extracellular loop of the β1-adrenergic receptor (AR, β1ECII-aabs) have been detected. Such antibodies chronically stimulate the β1-AR thereby inducing the adrenergic signaling cascade in cardiomyocytes, which, in the long run, contributes to heart failure progression. We analyzed the production of cAMP after aab-mediated β1-AR activation in vitro using a fluorescence resonance energy transfer (FRET) assay. This assay is based on HEK293 cells stably expressing human β1-AR as well as the cAMP-sensor Epac1-camps. The assay showed a concentration-dependent increase in intracellular cAMP upon stimulation with the full agonist (-) isoproterenol. This response was comparable to results obtained in isolated adult murine cardiomyocytes and was partially blockable by a selective β1-AR antagonist. In the same assay poly- and monoclonal anti-β1ECII-abs (induced in different animals) could activate the adrenergic signaling cascade, whereas isotypic control abs had no effect on intracellular cAMP levels. Using the same method, we were able to detect functionally activating aabs in the serum of heart failure patients with ischemic and hypertensive heart disease as well as patients with DCM, but not in sera of healthy control subjects. In patients with DCM we observed an inverse correlation between the stimulatory potential of anti-β1-aabs and left ventricular pump function. To adopt this assay for the detection of functionally activating anti-β1ECII-aabs in clinical routine we attempted to establish an automated large-scale approach. Neither flow cytometry nor FRET detection with a fluorescence plate reader provided an acceptable signal-to-noise ratio. It was possible to detect (-) isoproterenol in a concentration-dependent manner using two different FRET multiwell microscopes. However, due to focus problems large-scale detection of activating anti-β1ECII-abs could not be implemented. Neutralization of anti-β1-aabs with the corresponding epitope-mimicking peptides is a possible therapeutic approach to treat aab-associated autoimmune DCM. Using our FRET assay we could demonstrate a reduction in the stimulatory potential of anti-β1ECII-abs after in vitro incubation with β1ECII-mimicking peptides. Cyclic (and to a lesser extent linear) peptides in 40-fold molar excess acted as efficient ab-scavengers in vitro. Intravenously injected cyclic peptides in a rat model of DCM also neutralized functionally active anti-β1ECII-abs efficiently in vivo. For a detailed analysis of the receptor-epitope targeted by anti-β1ECII-abs we used sequentially alanine-mutated β1ECII-mimicking cyclic peptides. Our data revealed that the disulfide bridge between the cysteine residues C209 and C215 of the human β1-AR appears essential for the formation of the ab-epitope. Substitution of further amino acids relevant for ab-binding in the cyclic scavenger peptide by alanine reduced its affinity to the ab and the receptor-activating potential was blocked less efficiently. In contrast, the non-mutant cyclic peptide almost completely blocked ab-induced receptor activation. Using this ala-scan approach we were able to identify a “NDPK”-epitope as essential for ab binding to the β1ECII. In summary, neutralization of conformational activating anti-β1ECII-(a)abs by cyclic peptides is a plausible therapeutic concept in heart failure that should be further exploited based on the here presented data.
In the last decades, both the incidence and the severity of asthma have steadily increased. Furthermore, available therapies only treat the symptoms but do not cure the disease. Immune modulation induced by TLR agonists may be a promising novel approach to effectively treat asthma as it targets the underlying immunopathology directly rather than one mediator alone. The aim of this thesis was to investigate if the immunostimulatory properties of Toll-like receptor (TLR) agonists can be utilized to develop novel therapeutic intervention strategies for the treatment of asthma using murine models of allergic inflammation. For this purpose five different TLR agonists were tested in preclinical mouse models of acute and chronic asthma, both in preventive and therapeutic settings. Firstly, TLR-2, 3, 4, 7/8 and 9 agonists were delivered intratracheally at different doses before pulmonary allergen exposure in the asthma model of acute inflammation. TLR9 agonist CpG-containing oligodeoxynucleotides (CpG) > TLR7 agonist Resiquimod (R848) > TLR3 agonists poly(I:C) strongly reduced allergen induced airway eosinophilia and IL-4 levels in a dose-dependent manner. All TLR agonists increased neutrophil numbers, TLR4 agonist lipopolysaccharide (LPS) > TLR2 agonist lipoteichonic acid (LTA) > poly(I:C) > CpG > R848 and, with the exception of R848, the amount of pro-inflammatory cytokines in the airways. Suppressive effects were not dependent upon IFN-γ and IL-10 or associated with increased numbers of regulatory T cells in the airways. All TLR agonists, except LTA, similarly reduced airway eosinophilia and IL-4 levels when applied therapeutically after allergen challenge. These results show that the TLR agonists have different suppressive effects on TH2 responses in the airways which further depend on the dose and the experimental setup in which they were tested. Interestingly, all agonists induced airway neutrophilia, albeit to different degrees, raising the question if TLR ligands are safe for human use when applied directly into the lung. Different TLR agonists are also being developed for human use as adjuvants combined with allergen in specific immunotherapy. Recent clinical data suggest that this may be achieved by induction of allergen-specific TH1 responses. For this reason, the ability of different TLR agonists to induce allergen-specific TH1 and suppress allergen-specific TH2 responses in a preclinical setting was investigated in this thesis. Different doses of the TLR agonists were applied together with allergen, then mice were exposed to allergen aerosol. CpG > LPS >LTA dose-dependently strongly suppressed the development of airway eosinophilia with poly(I:C) and R848 having no effect. The decrease in eosinophilic numbers was associated withincreased neutrophils present in the airways. IL-4 and IL-5 levels in the bronchoalveolar lavage fluid were also decreased when poly(I:C), LPS, and CpG were used. All TLR agonists increased allergen-specific IgG2a, and with the exception of poly(I:C), reduced allergen-specific IgE levels in the serum. Cutaneous anaphylaxis to allergen was completely prevented when LPS or CpG were given as adjuvant. The strongest TH1 responses were induced by CpG and poly(I:C), characterized by the presence of IFN-γ in the bronchoalveolar lavage and the highest allergen-specific IgG2a levels in the serum. This data supports approaches to use TLR9 or TLR4 agonists for human therapy as adjuvant in combination with allergen in novel specific immunotherapy formulations. In the last part of the thesis, it was investigated if TLR activation can also affect the pathology of severe chronic asthma. Therapeutic administration of R848 or CpG reduced features of inflammation and remodeling. Both agonists showed superior effects to dexamethasone, with CpG being more efficient than R848. This result again supports a TLR9-based therapy as a viable option for the treatment of severe chronic asthma which may present a potential alternative for anti-inflammatory therapy with steroids. Taken together, the results of this thesis support the use of TLR agonists to treat asthma. The most favorable efficacy/safety ratio is to be expected from TLR-based therapies combining TLR4 or TLR9 agonists with allergen in specific immunotherapy. In regard to TLR agonist monotherapy, R848 and CpG showed the most promising profiles, CpG particularly in a model of severe chronic asthma. However, since all TLR agonists used in this study also showed pro-inflammatory potential, the safety aspect of such an approach needs to be taken into account.
Thrombus formation at sites of vascular lesions is a dynamic process that requires a defined series of molecular events including the action of platelet adhesion/activation receptors, intracellular signal transduction, cytoskeletal rearrangements and activation of plasma coagulation factors. This process is essential to limit post-traumatic blood loss but may also contribute to acute thrombotic diseases such as myocardial infarction and stroke. With the help of genetically modified mice and the use of specific protein inhibitors and receptordepleting antibodies, the work presented in this thesis identified novel mechanisms underlying thrombus formation in hemostasis and thrombosis. In the first part of the study, it was shown that von Willebrand Factor (vWF) binding to glycoprotein (GP)Iba is critical for the formation of stable pathological thrombi at high shear rates, suggesting GPIba as an attractive pharmacological target for antithrombotic therapy. The subsequent analysis of recently generated phospholipase (PL)D1-deficient mice identified this enzyme, whose role in platelet function had been largely unknown, as a potential target protein downstream of GPIba. This was based on the finding that PLD1- deficient mice displayed severely defective GPIba-dependent thrombus stabilization under high shear conditions in vitro and in vivo without affecting normal hemostasis. The second part of the thesis characterizes the functional relevance of the immunoreceptor tyrosine-based activation motif (ITAM)-bearing collagen receptor GPVI and the recently identified hemITAM-coupled C-type lectin-like receptor 2 (CLEC-2) for in vivo thrombus formation. Genetic- and antibody-induced GPVI deficiency was found to similarly protect mice from arterial vessel occlusion in three different thrombosis models. These results confirmed GPVI as a promising antithrombotic target and revealed that antibody-treatment had no obvious off-target effects on platelet function. Similarly, immunodepletion of CLEC-2 by treating mice with the specific antibody INU1 resulted in markedly impaired thrombus growth and stabilization under flow in vitro and in vivo. Furthermore, it could be demonstrated that double-immunodepletion of GPVI and CLEC-2 resulted in severely decreased arterial thrombus formation accompanied by dramatically prolonged bleeding times. These data revealed an unexpected redundant function of the two receptors for in vivo thrombus formation and might have important implications for the potential development of anti-GPVI and anti-CLEC-2 antithrombotic agents. The third part of the thesis provides the first functional analysis of megakaryocyte- and platelet-specific RhoA knockout mice. RhoA-deficient mice displayed a defined signaling defect in platelet activation, leading to a profound protection from arterial thrombosis andand ischemic brain infarction, but at the same time also strongly increased bleeding times. These findings identified the GTPase as an important player for thrombus formation in hemostasis and thrombosis. Based on the previous proposal that the coagulation factor (F)XII might represent an ideal target for safe antithrombotic therapy without causing bleeding side effects, the last part of this thesis assesses the antithrombotic potential of the newly generated FXIIa inhibitor rHAInfestin- 4. It was found that rHA-Infestin-4 injection into mice resulted in virtually abolished arterial thrombus formation but no change in bleeding times. Moreover, rHA-Infestin-4 was similarly efficient in a murine model of ischemic stroke, suggesting that the inhibitor might be a promising agent for effective and safe therapy of cardio- and cerebrovascular diseases.
Super-resolution fluorescence imaging based on inglemolecule localization relies critically on the availability of efficient processing algorithms to distinguish, identify, and localize emissions of single fluorophores. In multiple current applications, such as threedimensional, time-resolved or cluster imaging, high densities of fluorophore emissions are common. Here, we provide an analytic tool to test the performance and quality of localization microscopy algorithms and demonstrate that common algorithms encounter difficulties for samples with high fluorophore density. We demonstrate that, for typical single-molecule localization microscopy methods such as dSTORM and the commonly used rapidSTORM scheme, computational precision limits the acceptable density of concurrently active fluorophores to 0.6 per square micrometer and that the number of successfully localized fluorophores per frame is limited to 0.2 per square micrometer.