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• W2922211187 abstract "The model with cultured Madin-Darby canine kidney (MDCK) cells is useful in studying the biogenesis of epithelial polarity and junction formation and provides insight into early steps in the morphogenesis of polarized epithelial tissues. When extracellular Ca2+ in the medium is changed from less than 5 microM to 1.8 mM, MDCK cells rapidly change from a nonpolarized state exhibiting little cell-cell contact (with the apical membrane and junctional proteins largely within the cell) to a polarized state with well-formed tight junctions and desmosomes. To examine the role of intracellular Ca2+ in the development of polarity and junctions, we made continuous spectrofluorimetric measurements of intracellular Ca2+ during the switch, using the fluorescent indicator fura-2. Intracellular Ca2+ increased greater than 10-fold during the switch and gave a complex pattern of increase, decrease, and stabilization. In contrast, intracellular pH [monitored with 29,79-bis(2-carboxyethyl)-5(and 6)-carboxyfluorescein (BCECF)] did not change during the period studied. When intracellular Ca2+ curves in several cells were compared, considerable heterogeneity in the rate of increase of intracellular Ca2+ levels and in peak levels was evident, perhaps reflecting the heterogeneity among cells in establishing junctions and polarity. The heterogeneity of the process was confirmed by digital imaging of intracellular Ca2+ and was present even in a clonal line of MDCK cells, indicating the heterogeneity was intrinsic to the process and not simply a function of slight genetic variation within the population of MDCK cells. In pairs of cells that had barely established cell-cell contact, often one cell exhibited a much greater increase in intracellular Ca2+ than the other cell in the pair. At the site of cell-cell contact, an apparent localized change (an increase over the basal level) in intracellular Ca2+ was frequently present and occasionally appeared to extend beyond the point of cell-cell contact. Since the region of cell-cell contact is also the site where junctions form and where vesicles containing apical membranes fuse during the development of polarity, we postulate a role for global and local changes in intracellular Ca2+ in these events." @default.
• W2922211187 created "2019-03-22" @default.
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• W2922211187 date "2019-03-09" @default.
• W2922211187 modified "2023-09-25" @default.
• W2922211187 title "Transfer of Xanthomonas campestris pv. arecae, and Xanthomonas campestris pv. musacearum to Xanthomonas vasicola (Vauterin) as Xanthomonas vasicola pv. arecae comb. nov., and Xanthomonas vasicola pv. musacearum comb. nov. and description of Xanthomonas vasicola pv. vasculorum pv. nov" @default.
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• W2922211187 doi "https://doi.org/10.1101/571166" @default.
• W2922211187 hasPublicationYear "2019" @default.
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