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Am J Physiol Renal Physiol 254: F121-F133, 1988;
0363-6127/88 $5.00
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AJP - Renal Physiology, Vol 254, Issue 1 121-F133, Copyright © 1988 by American Physiological Society

ARTICLES

Mechanism of adrenergic stimulation of anion secretion in cultured rat epididymal epithelium

P. Y. Wong
Department of Physiology, Faculty of Medicine, University of Hong Kong.

Primary monolayer cultures of the epithelial cells from the rat cauda epididymidis had a basal transepithelial potential of 1.24 +/- 0.11 mV, apical side negative, a short-circuit current (SCC) of 2.42 +/- 0.17 microA/cm2, and a transepithelial resistance of 503 +/- 29.6 omega/cm2. Epinephrine (0.23 microM) added to the basolateral side caused a rise in the SCC (inward flowing) that was partially reversed by addition of amiloride, 4-acetamido-4'-isothiocyanostilbene-2,2'-disulfonic acid (SITS), bumetanide, and acetazolamide to the basolateral side. In the absence of Cl or HCO3, the SCC response to epinephrine was reduced by 65 and 66%, respectively. Removal of K reduced the SCC response by 40%, whereas Na removal completely abolished it. A23187 and phorbol ester, 12-O-tetradecanoylphorbol-13-acetate (TPA), stimulated the SCC when added to the apical side. Addition of the Cl channel blockers, anthracene-9-carboxylate and 5-nitro-2-(3-phenylpropylamino)-benzoic acid (NPPB) to the apical side reduced the SCC in a dose-dependent manner. It is concluded that anion secretion by the epididymis shares common mechanisms with other Cl-secreting epithelia.


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