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Institut
- Theodor-Boveri-Institut für Biowissenschaften (67)
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- Medizinische Klinik und Poliklinik I (15)
- Institut für Psychologie (13)
- Institut für Virologie und Immunbiologie (12)
Sonstige beteiligte Institutionen
In common with most viruses, measles virus (MV) relies on the integrity of the cytoskeleton of its host cells both with regard to efficient replication in these cells, but also retention of their motility which favors viral dissemination. It is, however, the surface interaction of the viral glycoprotein (gp) complex with receptors present on lymphocytes and dendritic cells (DCs), that signals effective initiation of host cell cytoskeletal dynamics. For DCs, these may act to regulate processes as diverse as viral uptake and sorting, but also the ability of these cells to successfully establish and maintain functional immune synapses (IS) with T cells. In T cells, MV signaling causes actin cytoskeletal paralysis associated with a loss of polarization, adhesion and motility, which has been linked to activation of sphingomyelinases and subsequent accumulation of membrane ceramides. MV modulation of both DC and T cell cytoskeletal dynamics may be important for the understanding of MV immunosuppression at the cellular level.
As pattern recognition receptor on dendritic cells (DCs), DC-SIGN binds carbohydrate structures on its pathogen ligands and essentially determines host pathogen interactions because it both skews T cell responses and enhances pathogen uptake for cis infection and/or T cell trans-infection. How these processes are initiated at the plasma membrane level is poorly understood. We now show that DC-SIGN ligation on DCs by antibodies, mannan or measles virus (MV) causes rapid activation of neutral and acid sphingomyelinases followed by accumulation of ceramides in the outer membrane leaflet. SMase activation is important in promoting DC-SIGN signaling, but also for enhancement of MV uptake into DCs. DCSIGN-dependent SMase activation induces efficient, transient recruitment of CD150, which functions both as MV uptake receptor and microbial sensor, from an intracellular Lamp-1+ storage compartment shared with acid sphingomyelinase (ASM) within a few minutes. Subsequently, CD150 is displayed at the cell surface and co-clusters with DC-SIGN. Thus, DCSIGN ligation initiates SMase-dependent formation of ceramide-enriched membrane microdomains which promote vertical segregation of CD150 from intracellular storage compartments along with ASM. Given the ability to promote receptor and signalosome co-segration into (or exclusion from) ceramide enriched microdomains which provide a favorable environment for membrane fusion, DC-SIGN-dependent SMase activation may be of general importance for modes and efficiency of pathogen uptake into DCs, and their routing to specific compartments, but also for modulating T cell responses.
OBJECTIVE:
To demonstrate the role of angiogenesis in the progression of cutaneous squamous cell carcinoma.
INTRODUCTION:
Angiogenesis is a pivotal phenomenon in carcinogenesis. Its time course in cutaneous squamous cell carcinoma has not yet been fully established.
METHODS:
We studied the vascular bed in 29 solar keratoses, 30 superficially invasive squamous cell carcinomas and 30 invasive squamous cell carcinomas. The Chalkley method was used to quantify the microvascular area by comparing panendothelial (CD34) with neoangiogenesis (CD105) immunohistochemical markers. The vascular bed from non-neoplastic adjacent skin was evaluated in 8 solar keratoses, 10 superficially invasive squamous cell carcinomas and 10 invasive squamous cell carcinomas.
RESULTS:
The microvascular area in CD105-stained specimens significantly increased in parallel with cutaneous squamous cell carcinoma progression. However, no differences between groups were found in CD34 sections. Solar keratosis, superficially invasive squamous cell carcinoma and invasive squamous cell carcinoma samples showed significant increases in microvascular area for both CD34- and CD105-stained specimens compared with the respective adjacent skin.
DISCUSSION:
The angiogenic switch occurs early in the development of cutaneous squamous cell carcinoma, and the rate of neovascularization is parallel to tumor progression. In contrast to panendothelial markers, CD105 use allows a dynamic evaluation of tumor angiogenesis.
CONCLUSION:
This study demonstrated the dependence of skin carcinogenesis on angiogenesis.
Disorder-specific effects of polymorphisms at opposing ends of the Insulin Degrading Enzymegene
(2011)
Background
Insulin-degrading enzyme (IDE) is the ubiquitously expressed enzyme responsible for insulin and amyloid beta (Aβ) degradation. IDE gene is located on chromosome region 10q23-q25 and exhibits a well-replicated peak of linkage with Type 2 diabetes mellitus (T2DM). Several genetic association studies examined IDE gene as a susceptibility gene for Alzheimer's disease (AD), however with controversial results.
Methods
We examined associations of three IDE polymorphisms (IDE2, rs4646953; IDE7, rs2251101 and IDE9, rs1887922) with AD, Aβ42 plasma level and T2DM risk in the longitudinal Vienna Transdanube Aging (VITA) study cohort.
Results
The upstream polymorphism IDE2 was found to influence AD risk and to trigger the Aβ42 plasma level, whereas the downstream polymorphism IDE7 modified the T2DM risk; no associations were found for the intronic variant IDE9.
Conclusions
Based on our SNP and haplotype results, we delineate the model that IDE promoter and 3' untranslated region/downstream variation may have different effects on IDE expression, presumably a relevant endophenotype with disorder-specific effects on AD and T2DM susceptibility.
Yersinia enterocolitica subsp. palearctica serobiotype O:3/4 comprises about 80-90 % of all human patient isolates in Germany and Europe and is responsible for sporadic cases worldwide. Even though this serobiotype is low pathogenic, Y. enterocolitica subsp. palearctica serobiotype O:3/4 is involved in gastroenteritis, lymphadenitis and various extraintestinal sequelae as reactive arthritis. The main animal reservoir of this serobiotype are pigs, causing a high rate of O:3/4 contaminations of raw pork in butcher shops in Germany (e.g. Bavaria 25 %) and countries in north-east Europe. As Y. enterocolitica O:3/4 is geographically and phylogenetically distinct from the so far sequenced mouse-virulent O:8/1B strain, complete genome sequencing has been performed for the European serobiotype O:3/4 DSMZ reference strain Y11, which has been isolated from a patient stool. To gain greater insight into the Y. enterocolitica subspecies palearctica group, also draft genome sequences of two other human O:3/4 isolates (strains Y8265, patient isolate, and Y5307, patient isolate associated with reactive arthritis), a closely related Y. enterocolitica palearctica serobiotype O:5,27/3 (strain Y527P), and two biotype 1A strains (a nosocomial strain of serogroup O:5 and an environmental serogroup O:36 isolate) have been performed. Those strains were compared to the high-pathogenic Y. enterocolitica subsp. enterocolitica serobiotype O:8/1B strain 8081 to address the peculiarities of the strain Y11 and the Y. enterocolitica subspecies palearctica group. The main focus was to unravel the pathogenic potential of strain Y11 and thus to identify novel putative virulence genes and fitness factors, especially those that may constitute host specificity of serobiotype O:3/4. Y. enterocolitica subspecies palearctica serobiotype O:3/4 strains lack most of the mouse-virulence-associated determinants of Y. enterocolitica subsp. enterocolitica serotype O:8, for example the HPI, Yts1 type 2 and Ysa type three secretion systems. In comparison, serobiotype O:3/4 strains obviously acquired a different set of genes and genomic islands for virulence and fitness such as the Ysp type three secretion system, an RtxA-like putative toxin, insecticidal toxins and a functional PTS system for N-acetyl-galactosamine uptake, named aga-operon. The aga-operon is able to support the growth of the Y. enterocolitica subsp. enterocolitica O:8/1B on N-acetyl-galactosamine after transformation with the aga operon. Besides these genes, also two prophages, PhiYep-2 and PhiYep-3, and a asn tRNA-associated GIYep-01 genomic island might influence the Y. enterocolitica subsp. palearctica serobiotype O:3/4 pathoadaptation. The PhiYep-3 prophage and the GIYep-01 island show recombination activity and PhiYep-3 was not found in all O:3/4 strains of a small strain collection tested. Y. enterocolitica subsp. palearctica serobiotype O:5,27/3 strain Y527P was found to be closely related to all serobiotype O:3/4 strains, whereas the biotype 1A isolates have more mosaic-segmented genomes and share putative virulence genes both with serobiotypes O:8/1B and O:3/4, which implies their common descent. Besides the pYV virulence plasmid, biotype 1A strains lack classical virulence markers as the Ail adhesin, the YstA enterotoxin, and the virulence-associated protein C. Interestingly, there are no notable differences between the known virulence factors present in nosocomial and environmental strains, except the presence of a truncated Rtx toxin-like gene cluster and remnants of a P2-like prophage in the hospital serogroup O:5 isolate.
The charge transport in disordered organic bulk heterojunction (BHJ) solar cells is a crucial process affecting the power conversion efficiency (PCE) of the solar cell. With the need of synthesizing new materials for improving the power conversion efficiency of those cells it is important to study not only the photophysical but also the electrical properties of the new material classes. Thereby, the experimental techniques need to be applicable to operating solar cells. In this work, the conventional methods of transient photoconductivity (also known as "Time-of-Flight" (TOF)), as well as the transient charge extraction technique of "Charge Carrier Extraction by Linearly Increasing Voltage" (CELIV) are performed on different organic blend compositions. Especially with the latter it is feasible to study the dynamics, i.e. charge transport and charge carrier recombination, in bulk heterojunction (BHJ) solar cells with active layer thicknesses of 100-200 nm. For a well performing organic BHJ solar cells the morphology is the most crucial parameter finding a trade-off between an efficient photogeneration of charge carriers and the transport of the latter to the electrodes. Besides the morphology, the nature of energetic disorder of the active material blend and its influence on the dynamics are discussed extensively in this work. Thereby, the material system of poly(3-hexylthiophene-2,5-diyl) (P3HT) and [6,6]-phenyl-C61 butyric acid methyl ester (PC61BM) serves mainly as a reference material system. New promising donor or acceptor materials and their potential for application in organic photovoltaics are studied in view of charge dynamics and compared with the reference system. With the need for commercialization of organic solar cells the question of the impact of environmental conditions on the PCE of the solar cells raises. In this work, organic BHJ solar cells exposed to synthetic air for finite duration are studied in view of the charge carrier transport and recombination dynamics. Finally, within the framework of this work the technique of photo-CELIV is improved. With the modified technique it is now feasible to study the mobility and lifetime of charge carriers in organic solar cells under operating conditions.
The material system of interest in this thesis are II-VI-semiconductors. The first part of this thesis focuses on the formation of self-assembled CdSe-based quantum dots (QD) on ZnSe. The lattice constants of ZnSe and CdSe differ as much as about 7\% and therefore a CdSe layer grown on top of ZnSe experiences a huge strain. The aspired strain relief constitutes in the self-assembly of QDs (i.e. a roughened layer structure). Additionally, this QD layer is intermixed with Zn as this is also a possibility to decrease the strain in the layer. For CdSe on ZnSe, in Molecular Beam Epitaxy (MBE), various QD growth procedures were analysed with respect to the resulting Cd-content of the non-stoichiometric ternary (Zn,Cd)Se. The evaluation was performed by Raman Spectroscopy as the phonon frequency depends on the Cd-content. The second part of the thesis emphasis on the interface properties of n-ZnSe on n-GaAs. Different growth start procedures of the ZnSe epilayer may lead to different interface configurations with characteristic band-offsets and carrier depletion layer widths. The analysis is mainly focused on the individual depletion layer widths in the GaAs and ZnSe. This non-destructive analysis is performed by evaluating the Raman signal which comprises of phonon scattering from the depleted regions and coupled plasmon-phonon scattering from regions with free carriers.
This thesis concerned the quantification of cell adhesion molecules (CAM) in and on thin hydrogel films as surface modification of biomaterials. The established and well characterized, per se inert NCO-sP(EO-stat-PO) hydrogel system which allows the easy and reproducible bioactivation with peptides was used as basis for this thesis. Two methods can be used to functionalize the coatings. Ligands can either be mixed into the prepolymer solution in prior to layer formation (mix-in method), or freshly prepared coatings can be incubated with ligand solution (incubation method). Divided into three major parts, the first part of the thesis dealt with the concentration of ligands in the bulk hydrogel, whereas the second part of the thesis focused on the surface sensitive quantification of CAMs at the biointerface. The results were correlated with cell adhesion kinetics. The third part of this thesis investigated the biochemical and the structural mimicry of the extracellular matrix (ECM). ECM proteins were presented via sugar-lectin mediated binding and cell behavior on these surfaces was analyzed. Cell behavior on three-dimensional fibers with identical surface chemistry as the coatings in the previous sections of the thesis was analyzed and correlated with the amount of peptide used for bioactivation. Overall, the main question of this work was ‘How much?’ regarding maximal as well as optimal ligand concentrations for controlled cell-hydrogel interactions. The focus in the first practical part of this thesis was to analyze the amount of ligands in NCO-sP(EO-stat-PO) hydrogels using classical quantification methods. Coatings in 96-well plates as well as on glass were functionalized with GRGDS and 125I-YRGDS for radioisotopic detection (Chapter 3). Using the incubation method for functionalization, a maximal ligand binding using peptide concentrations of 600 µg/mL could be determined. When functionalization was introduced via the mix-in method, a clear tendency for higher ligand concentrations with increasing ligand to prepolymer ratio was observed, but no maximal ligand binding could be detected with a ligand to prepolymer ratio of 2/1 being the highest ratio investigated. This ratio of 2/1 was not exceeded to ensure that complete crosslinking of the hydrogel was not affected. In Chapter 4, a fluorinated amino acid and an iodinated peptide were immobilized to the hydrogels using the mix-in method and were detected by X-ray photoelectron spectroscopy (XPS) and time-of-flight secondary ion mass spectrometry (TOF-SIMS). In these measurements, maximal ligand binding was detected for a ligand to prepolymer ratio of 1/1. Higher ligand to prepolymer ratios did not result in any significant increase in ligand concentrations in the surface near regions of the crosslinked hydrogels. To address the question of how many ligands were actually accessible for cell interaction at the interface, surface sensitive quantification methods were applied in the second part of this thesis. For the quantification with surface plasmon resonance (SPR) and surface acoustic wave technology (SAW) (Chapter 5), the hydrogel coating procedure needed to be transferred onto cystamine functionalized gold surfaces. Characterization with ellipsometry and atomic force microscopy (AFM) revealed inhomogeneous cystamine binding to the activated surfaces, which resulted in inhomogeneous coatings. Nevertheless, it could be shown that SPR as well as SAW were suitable methods for the surface sensitive quantification of the ligand concentration on NCO-sP(EO-stat-PO) hydrogels. Non-functionalized coatings resisted non-specific serum as well as streptavidin (SA) adsorption. Coatings functionalized with biocytin and GRGDSK-biotin introduced specific SA binding that was dependent on the biotin concentration at the surface. Additionally, enzyme linked immunosorbent assay (ELISA) and enzyme linked lectin assay (ELLA) (Chapter 6) were applied to coatings in 96-well plates and on glass. Coatings were functionalized with the model molecule biocytin, the biotinylated peptide GRGDSK-biotin, the ECM protein fibronectin (FN), as well as the carbohydrates N-acetylglucosamine (GlcNAc) and N-acetyllactosamine (LacNAc). All ligands could be successfully detected with antibodies or SA via ELISA or ELLA. Maximal GRGDSK-biotin binding to the hydrogel coatings on glass was achieved at a peptide to prepolymer ratio of 1/5, which was used as reference value in Chapter 8. Last but not least, cell adhesion (Chapter 7) was quantified depending on the GRGDS concentration on hydrogel coatings on glass. Maximal adhesion of primary human dermal fibroblast (HDF) was observed at GRGDS to prepolymer ratios of 1/5, when adherent cells were counted on life cell images. Quantification of adherent cells using the CASY® cell counter revealed maximal HDF adhesion at molar ligand to prepolymer ratios of 1/2. However, cell vitality detected by intracellular enzyme activities was not dependent on the GRGDS concentration. Cells which managed to adhere were vital regardless of the amount of ligands present. Additionally, adhesion of fibroblasts from the murine cell line NIH L929 was analyzed by counting on life cell images. These cells, being much smaller than the HDF cells, needed higher GRGDS to prepolymer ratios (2/1) for proper cell adhesion. All quantification methods applied to analyze hydrogels which were functionalized by the mix-in method in Chapter 3, 4, 6 and 7, were compared in Chapter 8. Radiodetection gave information about the ligand concentrations throughout the whole hydrogel and no maximal amount of ligands could be detected when increasing the peptide to prepolymer ratio. In contrast, XPS and TOF-SIMS which only penetrated the surface near regions of the coating, a maximal ligand binding to the hydrogel was detected for 1/1 ratios. SPR and SAW were not included in this comparison, as the coatings on gold need to be optimized first. The two surface sensitive quantification methods (ELISA and HDF adhesion) could give information about the quantity of peptide which was sterically available for SA or cell binding. With these methods, maximal SA and cell binding was detected at ratios of 1/5. These results underline the importance of carefully compare the different methods. Beside ligand quantification on hydrogels, the third part of this thesis was concerned with the biochemical and structural mimicry of the ECM by advanced ECM engineering to design biomimetic biomaterials that are better accepted by cells and tissue. The subject of Chapter 9 was the biomimetic and flexible presentation of the ECM protein FN. FN was attached via sugar-lectin mediated binding to NCO-sP(EO-stat-PO) hydrogels. The build-up of the covalently immobilized sugar poly-N-acetyllactosamine (polyLacNAc), the subsequent non-covalent binding of the fungal galectin His6CGL2, and FN could be elegantly proven by fluorescent staining on coatings which were functionalized with the sugar by micro contact printing (MCP). Further experiments were carried out on build-ups, where polyLacNAc was immobilized on the hydrogel by incubation. Optimal parameters for the layer build-up were determined by ELLA/ELISA. Only the complete build-up induced proper adhesion of HDFs. Compared to tissue culture polystyrene (TCPS), cells adhered and spread faster on the biomimetic surfaces. The flexible presentation of FN allowed HDFs to rearrange homogenously immobilized FN into fibrillar structures, which seemed not to be possible when FN was adsorbed on glass or covalently bound directly to the hydrogel coatings. This new approach of a flexible and biomimetic presentation of an ECM protein allows new ways to design biomaterials with best possible cell-material interactions. The work described in Chapter 10 focused on the structural mimicry of the fibrous ECM structures by electrospinning of synthetic, bioactive, and degradable fibers. Poly(D,L-lactide-co-glycolide) (PLGA) and NCO-sP(EO-stat-PO) were electrospun out of one solution in an easy one-step preparation resulting in fibers with an ultrathin inert hydrogel layer at the surface. By adding GRGDS to the solution prior to electrospinning, specifically interacting fibers could be obtained. In comparison to PLGA, the adsorption of bovine serum albumin (BSA) could be reduced by 99.2%. As a control, the non-active peptide GRGES was immobilized to the fiber. These fibers did not allow cell adhesion, showing that the integrity of the hydrogel coated fibers was not affected by the immobilization of peptides. HDF adhesion was obtained by functionalization with GRGDS, leading to the adhesion, spreading, and proliferation of HDFs. Also mesenchymal stem cells (MSC) could adhere to GRGDS functionalized fibers. Additionally, for ligand quantification, the ELISA technique was successfully transferred to fiber substrates. To highlight the potential of the approaches for the biochemical and structural mimicry of the ECM, the sugar polyLacNAc was immobilized on the PLGA/sP(EO-stat-PO) fibers followed by the subsequent layer build-up with His6CGL2 and FN. These fibers triggered HDF adhesion.
In recent years high-throughput experiments provided a vast amount of data from all areas of molecular biology, including genomics, transcriptomics, proteomics and metabolomics. Its analysis using bioinformatics methods has developed accordingly, towards a systematic approach to understand how genes and their resulting proteins give rise to biological form and function. They interact with each other and with other molecules in highly complex structures, which are explored in network biology. The in-depth knowledge of genes and proteins obtained from high-throughput experiments can be complemented by the architecture of molecular networks to gain a deeper understanding of biological processes. This thesis provides methods and statistical analyses for the integration of molecular data into biological networks and the identification of functional modules, as well as its application to distinct biological data. The integrated network approach is implemented as a software package, termed BioNet, for the statistical language R. The package includes the statistics for the integration of transcriptomic and functional data with biological networks, the scoring of nodes and edges of these networks as well as methods for subnetwork search and visualisation. The exact algorithm is extensively tested in a simulation study and outperforms existing heuristic methods for the calculation of this NP-hard problem in accuracy and robustness. The variability of the resulting solutions is assessed on perturbed data, mimicking random or biased factors that obscure the biological signal, generated for the integrated data and the network. An optimal, robust module can be calculated using a consensus approach, based on a resampling method. It summarizes optimally an ensemble of solutions in a robust consensus module with the estimated variability indicated by confidence values for the nodes and edges. The approach is subsequently applied to two gene expression data sets. The first application analyses gene expression data for acute lymphoblastic leukaemia (ALL) and differences between the subgroups with and without an oncogenic BCR/ABL gene fusion. In a second application gene expression and survival data from diffuse large B-cell lymphomas are examined. The identified modules include and extend already existing gene lists and signatures by further significant genes and their interactions. The most important novelty is that these genes are determined and visualised in the context of their interactions as a functional module and not as a list of independent and unrelated transcripts. In a third application the integrative network approach is used to trace changes in tardigrade metabolism to identify pathways responsible for their extreme resistance to environmental changes and endurance in an inactive tun state. For the first time a metabolic network approach is proposed to detect shifts in metabolic pathways, integrating transcriptome and metabolite data. Concluding, the presented integrated network approach is an adequate technique to unite high-throughput experimental data for single molecules and their intermolecular dependencies. It is flexible to apply on diverse data, ranging from gene expression changes over metabolite abundances to protein modifications in a combination with a suitable molecular network. The exact algorithm is accurate and robust in comparison to heuristic approaches and delivers an optimal, robust solution in form of a consensus module with confidence values. By the integration of diverse sources of information and a simultaneous inspection of a molecular event from different points of view, new and exhaustive insights into biological processes can be acquired.
Bacterial protein toxins belong to the most potent toxins which are known. They exist in many different forms and are part of our every day live. Some of them are spread by the bacteria during infections and therefore play a crucial role in pathogenicity of these strains. Others are secreted as a defense mechanism and could be uptaken with spoiled food. Concerning toxicity, some of the binary toxins of the AB7-type belong to the most potent and dangerous toxins in the world. Even very small amounts of these proteins are able to cause severe symptoms during an infection with pathogen species of the genus Clostridium or Bacillus. Apart from the thread the toxins constitute, they exhibit a unique way of intoxication. Members of the AB7-toxin family consist of a pore-forming subunit B, that acts as a molecular syringe to translocate the enzymatic moieties A into the cytosol of target cells. This complex mechanism does not only kill cells with high efficiency and therefore should be studied for treatment, but also displays a possibility to address certain cells with a specific protein cargo if used as a molecular delivery tool. Concerning both issues, binding and translocation of the channel are the crucial steps to either block or modify the system in the desired way. To gain deeper insight into the transport of binary toxins the structure of the B subunit is of great importance, but being a membrane protein, no crystal could be obtained up to now for either protective antigen (PA) of Anthrax toxin or any other AB7-type binding domain. Therefore, the method of choice in this work is an electro-physical approach using the so-called black-lipid-bilayer system for determination of biophysical constants. Additionally, diverse cell based assays serve as a proving method for the data gained during in vitro measurements. Further information was gathered with specially designed mutants of the protein channel. The first part of this thesis focuses on the translocation process and its possible use as a molecular tool to deliver protein cargo into special cell types. The task was addressed by measuring the binding of different effector proteins related and unrelated to the AB7 toxin family. These proteins were tested in titration experiments for the blockage of the ion current through a membrane saturated with toxin channels. Especially the influence of positively charged His-tags has been determined in detail for PA and C2II. As described in chapter 2, a His-tag transferred the ability of being transported by PA, but not by C2II, to different proteins like EDIN (from S. aureus) in vitro and in cell-based experiments. This process was found to change the well-known voltage-dependency of PA to a huge extend and therefore is related to membrane potentials which play a crucial role in many processes in living cells. Chapter 3 sums up findings, which depict that binding partners of PA share certain common motives. These could be detected in a broad range of substrates, ranging from simple ions in an electrolyte over small molecules to complex protein effectors. The gathered information could be further used to design blocker-substrates for treatment of Anthrax infections or tags, which render PA possible as a molecular syringe for cargo proteins. The deeper insight to homologies and differences of binary toxin components is the core of chapter 4, in which the cross-reactivity of Anthrax and C2-toxin was analyzed. The presented results lead to a better understanding of different motives involved in binding and translocation to and via the B components PA and C2II, as well as the enzymatically active A moieties edema factor (EF), lethal factor (LF) and C2I. In the second part of the thesis, the blockage of intoxication is the center of interest. Therefore, chapter 5 focuses on the analysis of specially designed blocker-substrate molecules for PA. These molecules form a plug in the pore, abolishing translocation of the enzymatic units. Especially, if multi-resistant strains of Anthrax (said to be already produced in Russia as a biological weapon) are taken into consideration, these substrates could stop intoxication and buy time, to deal with the infection. Chapter 6 describes the blockage of PA-channels by anti-His antibody from the trans-side of the porin, an effect which was not described for any other antibody before. Interestingly, even mutation of the estimated target amino acid Histidine 310 to Glycine could not interfere with this ionic strength dependent binding.