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Am J Physiol. 1999 Dec;277(6):F821-5. doi: 10.1152/ajprenal.1999.277.6.F821.

Potassium secretion and the regulation of distal nephron K channels.

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Department of Physiology and Biophysics, Weill Medical College of Cornell University, New York, New York 10021, USA.


K-selective channels in the luminal membranes of distal nephron segments form a key pathway for the secretion of K ions into the urine. This process is important to the control of K balance, particularly under conditions of normal or high K intake. This brief review will cover three issues: 1) the identification of apical K channels, 2) the role of these channels in the maintenance of K homeostasis, and 3) the role of aldosterone in this regulatory process. The large amount of literature on renal K transport has been elegantly summarized in a recent review in this journal [G. Giebisch. Am. J. Physiol. 274 (Renal Physiol. 43): F817-F833, 1998]. Here I will focus on a few prominent unsolved problems.

[Indexed for MEDLINE]

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