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Science 28 July 1989:
Vol. 245. no. 4916, pp. 402 - 404
DOI: 10.1126/science.2474200
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Articles

Science, Vol 245, Issue 4916, 402-404
Copyright © 1989 by American Association for the Advancement of Science

articles

Activation of apical chloride channels in the gastric oxyntic cell

Demarest JR, DD Loo, and G Sachs

Center for Ulcer Research and Education, Wadsworth Veterans Administration Medical Center, Los Angeles, CA 90073.

Oxyntic cells that retain distinct morphological polarity between apical and basolateral membranes were isolated from the gastric mucosa of the amphibian Necturus. Patch-clamp techniques were applied to these cells to identify apical membrane ion channels associated with hydrochloric acid secretion. A single class of voltage-dependent, inwardly rectifying chloride channels was observed in the apical membranes of both resting and stimulated (acid-secreting) oxyntic cells. Stimulation of the cells with dibutyryladenosine 3',5'-monophosphate and isobutylmethylxanthine increased channel open probability and simultaneously increased apical membrane surface area. This chloride channel is probably responsible for electrogenic chloride secretion by the gastric mucosa and may also participate in the fluid- and enzyme-secretory functions of the oxyntic cell, analogous to the chloride channels found in the apical membranes of other exocrine cells.


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