Lars Winkler

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Claudins are tetraspan transmembrane proteins of tight junctions. They determine the barrier properties of this type of cell-cell contact existing between the plasma membranes of two neighbouring cells, such as occurring in endothelia or epithelia. Claudins can completely tighten the paracellular cleft for solutes, and they can form paracellular ion pores.(More)
The transcription factor RovA of Yersinia pseudotuberculosis and analogous proteins in other Enterobacteriaceae activate the expression of virulence genes that play a crucial role in stress adaptation and pathogenesis. In this study, we demonstrate that the RovA protein forms dimers independent of DNA binding, stimulates RNA polymerase, most likely via its(More)
Claudins are the critical transmembrane proteins in tight junctions. Claudin-5, for instance, prevents paracellular permeation of small molecules. However, the molecular interaction mechanism is unknown. Hence, the claudin-claudin interaction and tight junction strand formation were investigated using systematic single mutations. Claudin-5 mutants(More)
Clostridium perfringens enterotoxin (CPE) binds to the extracellular loop 2 of a subset of claudins, e.g. claudin-3. Here, the molecular mechanism of the CPE-claudin interaction was analyzed. Using peptide arrays, recombinant CPE-(116-319) bound to loop 2 peptides of mouse claudin-3, -6, -7, -9, and -14 but not of 1, 2, 4, 5, 8, 10-13, 15, 16, 18-20, and(More)
The blood-brain barrier (BBB) is formed by microvascular endothelial cells sealed by tetraspanning tight junction (TJ) proteins, such as claudins and TAMPs (TJ-associated marvel proteins, occludin and tricellulin). Claudins are the major components of the TJs. At the BBB, claudin-5 dominates the TJs by preventing the paracellular permeation of small(More)
A new-technology cigarette has been developed. While the new cigarette burns some tobacco, it does not use tobacco as the fuel to sustain combustion and provide heat to the cigarette. Rather, the new cigarette primarily heats tobacco thereby reducing products of smoke formation mechanisms such as tobacco combustion, tobacco pyrolysis and pyrosynthesis. The(More)
Inhibins are multipotent dimeric glycoproteins, composed of an α-subunit and one of two possible β-subunits (βA or βB). Aims of this study were (a): the immunohistochemical characterisation of normal human endometrium for the inhibin-α subunit; (b) the assessment of the secretion and metabolism of inhibin, E2 and cortisol; (c) the evaluation of any(More)
The separate in vitro cultivation of isolated and purified human endometrial glands and stromal cells seems to be the most attractive experimental way of studying the endometrial function on cellular level. In this paper a new method has been described to establish monolayer cultures of isolated endometrial stromal and epithelial cell populations. After a(More)
Influenza A virus (IAV) has previously been shown to alter chemotactic, oxidative, and secretory functions of polymorphonuclear leukocytes (PMNL). Because of the role of cytoskeletal proteins in these processes, studies were carried out to determine if IAV altered the PMNL cytoskeleton. PMNL were incubated with buffer of IAV, stimulated with f-met-leu-phe(More)