Changes in Proximal and Distal Tubular Reabsorption Produced by Rapid Expansion of Extracellular Fluid

Overview

Journal J Clin Invest

Specialty General Medicine

Date 1967 Jul 1

PMID 6027087

Citations 38

Authors

J P HAYSLETT

M Kashgarian

F H EPSTEIN

Affiliations

Soon will be listed here.

Abstract

Acute infusions of isotonic saline in the rat cause an increase in glomerular filtration rate and in the excretion of salt and water. The kidney swells, due to expansion of tubular and interstitial volume. Despite the increase in tubular diameter, transit time through the proximal tubules and loops of Henle is decreased, presumably owing to a greatly accelerated rate of tubular flow. Proximal tubular reabsorption, measured in blocked tubules, is inhibited in a way that cannot be ascribed to changes in tubular diameter. The prolongation of proximal reabsorptive half-time is not affected by the administration of aldosterone. It occurs equally in rats chronically loaded with or deprived of salt, and it is therefore not likely that it is influenced by the renal content of renin. In contrast, reabsorption from the distal convoluted tubule is enhanced by saline infusion. This change is observed in segments of tubules blocked with oil and isolated from their glomeruli and thus appears to occur independently of changes in glomerular filtration or tubular flow.

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