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Section Neurobiology, Swammerdam Institute for Life Sciences, University of Amsterdam, 1098 SM Amsterdam, The Netherlands
Tight junction permeability differs with the type of permeants, their size, and their charge. Selective changes in permeability do occur, and they illustrate the diversity in functional reactions of tight junctions. This suggests that special structures in the tight junctions are involved. More and more structural components of the tight junctions are becoming known. The divergence in behavior of native tissue and filter-grown epithelial monolayers with respect to the effects of intracellular messengers offers the possibility to relate structure and function. In addition to the tools for conventional permeability studies, probes have become available to detect changes in activation of intracellular effector proteins such as the protein kinase C isotypes, and with in situ imaging techniques the way is open for a functional approach in the study of tight junctions.
protein kinase A; protein kinase C; ion selectivity; macromolecular permeability; Caco-2; T84; HT29cl.19A
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