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• W2318018840 startingPage "C254" @default.
• W2318018840 abstract "The relationship between adenosine 3',5'-cyclic monophosphate (cAMP)-mediated Cl- secretion and the cellular location of the cystic fibrosis transmembrane conductance regulator (CFTR) was determined in both polarized (Cl.19A) and unpolarized (parental) HT-29 colonocytes expressing similar levels of CFTR mRNA and protein. CFTR immunolocalized to the apical membrane domain of polarized colonocytes exhibiting cAMP-responsive Cl- secretion. In contrast, CFTR staining was perinuclear in unpolarized colonocytes, which gave little or no cAMP-stimulated Cl- conductance responses. Thus cAMP-stimulated Cl- secretion coincided with an apical localization of CFTR. Brefeldin A (BFA) was used to perturb glycoprotein targeting in these cells. In polarized colonocytes, BFA caused a reversible, time-dependent decrease in the Cl-conductance response to cAMP but not Ca2+. Apical CFTR redistributed into large coalesced intracellular vesicles, located within the same plane as the microtubule organizing center, a marker for the trans-Golgi network (TGN). In preconfluent monolayers or unpolarized HT-29 cells, BFA had no effect on CFTR staining, which remained perinuclear. Mature, Golgi-processed CFTR protein was isolated from both polarized and unpolarized colonocytes. Thus the mechanism for polarization-dependent apical membrane CFTR targeting and the acquisition of cAMP-dependent Cl- secretion lies at or beyond the late Golgi-TGN in epithelial cells." @default.
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• W2318018840 date "1994-01-01" @default.
• W2318018840 modified "2023-10-04" @default.
• W2318018840 title "Polarization-dependent apical membrane CFTR targeting underlies cAMP-stimulated Cl- secretion in epithelial cells" @default.
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• W2318018840 doi "https://doi.org/10.1152/ajpcell.1994.266.1.c254" @default.
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