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AJP - Renal Physiology, Vol 271, Issue 2 414-F422, Copyright © 1996 by American Physiological Society
ARTICLES |
J. Terris, C. A. Ecelbarger, S. Nielsen and M. A. Knepper
Laboratory of Kidney and Electrolyte Metabolism, National Heart, Lung, and Blood Institute, Bethesda, Maryland 20892, USA.
The aquaporins are molecular water channels expressed in the kidney and other organs. To investigate long-term regulation of renal expression of these water channels, we carried out immunoblotting studies using membrane fractions from rat renal cortex and medulla. Both 48-h water restriction in Sprague-Dawley rats and 5-day arginine vasopressin (AVP) infusion in Brattleboro rats caused significant increases in the expression levels of two aquaporins, aquaporin-2 and aquaporin-3, while the levels of aquaporin-1 and aquaporin-4 were unchanged. The increases in aquaporin-2 and aquaporin-3 expression were seen in inner and outer medulla as well as cortex. Ablation of the corticomedullary interstitial osmotic gradient with an infusion of furosemide did not eliminate the upregulatory response to AVP infusion in Brattleboro rats. Furthermore, 5-day furosemide infusion to Sprague-Dawley rats did not decrease expression levels of the collecting duct aquaporins, but rather increased them. We conclude that the expression of aquaporin-2 and aquaporin-3, but not aquaporin-1 or aquaporin-4, is increased in response to elevated circulating AVP. Because regulation of aquaporin-2 and aquaporin-3 levels was observed in the cortex and because osmotic gradient ablation did not abrogate the increase, we conclude that changes in interstitial osmolality are not necessary for the AVP-induced upregulation of aquaporin-2 and aquaporin-3 expression.
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