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Physiol. Rev. 81: 85-116, 2001;
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Physiological Reviews, Vol. 81, No. 1, January 2001, pp. 85-116
Copyright ©2001 by the American Physiological Society

Potassium Transport in the Mammalian Collecting Duct

Shigeaki Muto

Department of Nephrology, Jichi Medical School, Minamikawachi, Tochigi, Japan

Muto, Shigeaki Potassium Transport in the Mammalian Collecting Duct. Physiol. Rev. 81: 85-116, 2001.The mammalian collecting duct plays a dominant role in regulating K+ excretion by the nephron. The collecting duct exhibits axial and intrasegmental cell heterogeneity and is composed of at least two cell types: collecting duct cells (principal cells) and intercalated cells. Under normal circumstances, the collecting duct cell in the cortical collecting duct secretes K+, whereas under K+ depletion, the intercalated cell reabsorbs K+. Assessment of the electrochemical driving forces and of membrane conductances for transcellular and paracellular electrolyte movement, the characterization of several ATPases, patch-clamp investigation, and cloning of the K+ channel have provided important insights into the role of pumps and channels in those tubule cells that regulate K+ secretion and reabsorption. This review summarizes K+ transport properties in the mammalian collecting duct. Special emphasis is given to the mechanisms of how K+ transport is regulated in the collecting duct.




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