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. 1982 Sep;70(3):667–672. doi: 10.1172/JCI110661

Role of angiotensin II in potassium-mediated stimulation of aldosterone secretion in the dog.

J H Pratt
PMCID: PMC370270  PMID: 6286729

Abstract

Potassium is known to enhance the aldosterone-stimulating action of angiotensin II. Such a synergistic interaction of potassium with angiotensin II could represent an action by angiotensin II to potentiate potassium as a stimulus. To examine for this effect of angiotensin II on potassium, plasma aldosterone levels were measured before and after an infusion of potassium chloride (15 meq i.v.) into dogs without and with prevention of angiotensin II formation by captopril, an angiotensin converting-enzyme inhibitor. In addition, responses to potassium were measured in a group of dogs receiving angiotensin II plus captopril. After potassium infusion, control dogs showed an increase of 7.7 +/- 1.9 (SEM) ng/dl (P less than 0.001) in the level of plasma aldosterone. In contrast, captopril-treated dogs showed no change in plasma aldosterone concentration in response to potassium. When angiotensin II was administered to captopril-treated dogs responsiveness to potassium administration was restored (plasma aldosterone concentration increased by 7.4 +/- 2.1 ng/dl, P less than 0.002). ACTH stimulated aldosterone secretion despite captopril treatment (P less than 0.001), however, ACTH produced a greater increase in the plasma aldosterone concentration in controls than in captopril-treated animals. It is evident from these results that stimulation of aldosterone secretion by potassium is considerably enhanced by angiotensin II. There appears to exist an important interdependence of these stimuli in the regulation of aldosterone secretion.

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Selected References

These references are in PubMed. This may not be the complete list of references from this article.

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