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The Journal of General Physiology, Vol 102, 25-42, Copyright © 1993 by The Rockefeller University Press
ARTICLES |
J Pacha, G Frindt, L Antonian, RB Silver and LG Palmer
Department of Physiology and Biophysics, Cornell University Medical College, New York 10021.
The activity of apical membrane Na channels in the rat cortical collecting tubule was studied during manipulation of the animals' mineralocorticoid status in vivo using a low-Na diet or the diuretic furosemide. Tubules were isolated and split open to expose the luminal membrane surface. Induction of Na channel activity was studied in cell- attached patches of the split tubules. No activity was observed with control animals on a normal diet. Channel activity could be induced by putting the animals on the low-Na diet for at least 48 h. The mean number of open channels per patch (NPo) was maximal after 1 wk on low Na. Channels were also induced within 3 h after injection of furosemide (20 mg/kg body wt per d). NPo was maximal 48 h after the first injection. In both cases, increases in NPo were primarily due to increases in the number of channels per patch (N) at a constant open probability (Po). With salt depletion or furosemide injection NPo is a saturable function of aldosterone concentration with half-maximal activity at approximately 8 nM. When animals were salt repleted after 1- 2 wk of salt depletion, both plasma aldosterone and NPo fell markedly within 6 h. NPo continued to decrease over the next 14 h, while plasma aldosterone rebounded partially. Channel activity may be dissociated from aldosterone concentrations under conditions of salt repletion.
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