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J Am Soc Nephrol 10:1126-1135, 1999
© 1999 American Society of Nephrology

SCIENCE WATCH

Lessons on Renal Physiology from Transgenic Mice Lacking Aquaporin Water Channels

A. S. VERKMAN

Departments of Medicine and Physiology, Cardiovascular Research Institute, University of California, San Francisco, California.

Correspondence to Dr. Alan S. Verkman, 1246 Health Sciences East Tower, Cardiovascular Research Institute, University of California, San Francisco, San Francisco, CA 94143-0521. Phone: 415-476-8530; Fax: 415-665-3847; E-mail: verkman{at}itsa.ucsf.edu ; Internet: http://www.ucsf.edu/verklab

Abstract. Several aquaporin-type water channels are expressed in kidney: AQP1 in the proximal tubule, thin descending limb of Henle, and vasa recta; AQP2, AQP3, and AQP4 in the collecting duct; AQP6 in the papilla; and AQP7 in the proximal tubule. AQP2 is the vasopressin-regulated water channel that is important in hereditary and acquired diseases affecting urine-concentrating ability. It has been difficult to establish the roles of the other aquaporins in renal physiology because suitable aquaporin inhibitors are not available. One approach to the problem has been to generate and analyze transgenic knockout mice in which individual aquaporins have been selectively deleted by targeted gene disruption. Phenotype analysis of kidney and extrarenal function in knockout mice has been very informative in defining the role of aquaporins in organ physiology and addressing basic questions regarding the route of transepithelial water transport and the mechanism of near isoosmolar fluid reabsorption. This article describes new renal physiologic insights revealed by phenotype analysis of aquaporin-knockout mice and the prospects for further basic and clinical developments.




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