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Journal of Experimental Biology, Vol 136, Issue 1 383-403, Copyright © 1988 by Company of Biologists

JOURNAL ARTICLES

Functional characterization of a voltage-gated anion channel from teleost fish intestinal epithelium

CA Loretz and CR Fourtner
Department of Biological Sciences, State University of New York, Buffalo 14260.

An anion channel was isolated, using patch-clamp technique, from the basolateral membrane of goby intestinal epithelial cells. Single-channel conductance varied over a range from 20 to 90 pS. The channel was voltage-gated over the physiological range of cell membrane potential with depolarization increasing the proportion of time in the open state. There was no Ca2+ sensitivity. The selectivity sequence was SO4(2-) greater than Cl- greater than Mes-. The channel may function in vivo as one of several avenues of basolateral membrane Cl- exit with the voltage-gating property serving to match basolateral Cl- exit to apical entry.


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© The Company of Biologists Ltd 1988