Pflügers Archiv

, Volume 399, Issue 2, pp 139–146 | Cite as

Short-term effect of aldosterone on renal sodium transport and tubular Na−K-ATPase in the rat

  • G. El Mernissi
  • A. Doucet
Transport Processes, Metabolism and Endocrinology Kidney, Gastrointestinal Tract, and Exocrine Glands (B)

Abstract

The short-term effect of one single injection of aldosterone on the renal sodium transport on one hand, and the Na−K-ATPase activity on the other hand, was studied in chronic adrenalectomized rats. Sodium transport was estimated by clearances, and Na−K-ATPase was measured in microdissected fragments of the nephron, according to our microtechnique previously described. Five to eight days after adrenalectomy, only 30% of the initial enzyme activity was recovered in the cortical collecting tubule (CCT). Administration of aldosterone completely restored the ATP-ase activity within three hours. Adrenalectomy also curtailed by 20–45% the activity of other nephron segments but aldosterone had no stimulatory effect on them. Sodium-reabsorption also increased after the hormone injection, following the same time (0.5<t1/2<1 h) and dose dependencies (0.8<K1/2<0.9 μg/kg) as those observed for the enzyme activity in the CCT. It is concluded that the short-term stimulation of Na−K-ATPase in the collecting tubule, after an acute administration of aldosterone, may be responsible for the simultaneous increase in sodium transport.

Key words

Adrenalectomized rats Sodium clearance Nephron microdissection Mineralocorticoids 

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Copyright information

© Springer-Verlag 1983

Authors and Affiliations

  • G. El Mernissi
    • 1
  • A. Doucet
    • 1
  1. 1.Laboratoire de Physiologie CellulaireCollège de FranceParis Cedex 05France

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