Evidence that Basolateral But Not Apical Membrane Localization of Outwardly Rectifying Depolarization-Induced Cl− Channel in Airway Epithelia

Evidence that Basolateral But Not Apical Membrane Localization of Outwardly Rectifying... The rat primary cultured-airway monolayer had been an excellent model for deciphering the ion channel after nystatin permeabilization of its basolateral or apical membrane (Hwang et al., 1996). After apical membrane permeabilization of rat primary cultured-airway monolayer, 4,4′-diisothiocyanatostilbene-2,2′-disulfonic acid (DIDS)-sensitive outwardly rectifying depolarization-induced Cl− (BORDIC) currents were observed across the basolateral membrane in symmetrical NMG-Cl solution in this study. No significant Cl− current induced by the application of voltage clamping was observed across the apical membrane in symmetrical NMG-Cl solution after basolateral membrane permeabilization. The halide permeability sequence for BORDIC current was Br−≒ I− > Cl−. BORDIC current was not affected by basolaterally applied bumetanide (0.5 mm). Basolateral DIDS (0.2 mm) but not apical DIDS inhibited CFTR mediated short-circuit current (I sc ) in an intact monolayer of rat airway epithelia, a T84 human colonal epithelial cell line, and a Calu-3 human airway epithelial cell line. This is the first report showing that depolarization induced Cl− current is present on the basolateral membrane of airway epithelia. http://www.deepdyve.com/assets/images/DeepDyve-Logo-lg.png The Journal of Membrane Biology Springer Journals

Evidence that Basolateral But Not Apical Membrane Localization of Outwardly Rectifying Depolarization-Induced Cl− Channel in Airway Epithelia

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Publisher
Springer-Verlag
Copyright
Copyright © Inc. by 2000 Springer-Verlag New York
Subject
Life Sciences; Biochemistry, general; Human Physiology
ISSN
0022-2631
eISSN
1432-1424
D.O.I.
10.1007/s00232001091
Publisher site
See Article on Publisher Site

Abstract

The rat primary cultured-airway monolayer had been an excellent model for deciphering the ion channel after nystatin permeabilization of its basolateral or apical membrane (Hwang et al., 1996). After apical membrane permeabilization of rat primary cultured-airway monolayer, 4,4′-diisothiocyanatostilbene-2,2′-disulfonic acid (DIDS)-sensitive outwardly rectifying depolarization-induced Cl− (BORDIC) currents were observed across the basolateral membrane in symmetrical NMG-Cl solution in this study. No significant Cl− current induced by the application of voltage clamping was observed across the apical membrane in symmetrical NMG-Cl solution after basolateral membrane permeabilization. The halide permeability sequence for BORDIC current was Br−≒ I− > Cl−. BORDIC current was not affected by basolaterally applied bumetanide (0.5 mm). Basolateral DIDS (0.2 mm) but not apical DIDS inhibited CFTR mediated short-circuit current (I sc ) in an intact monolayer of rat airway epithelia, a T84 human colonal epithelial cell line, and a Calu-3 human airway epithelial cell line. This is the first report showing that depolarization induced Cl− current is present on the basolateral membrane of airway epithelia.

Journal

The Journal of Membrane BiologySpringer Journals

Published: Aug 1, 2000

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