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Endocrinology, Vol 116, 1712-1716, Copyright © 1985 by Endocrine Society

ARTICLES

Decreases in renin and aldosterone secretion in alloxan diabetes: an effect of insulin deficiency

JH Pratt, CA Parkinson, MH Weinberger and WC Duckworth

The effect in the rat of alloxan diabetes (with and without insulin treatment) on renin and aldosterone secretion was examined. Rats with diabetes for 7 weeks were found to have lower PRA than nondiabetic controls. The decrease in PRA appeared to result from insulin deficiency since PRA was normal in diabetic rats given insulin. In a second set of animals, which were killed after 3 weeks, in vitro measurements of aldosterone production by perifused adrenal capsular tissue were carried out. Production of aldosterone was greatest by adrenal capsular tissue from insulin-treated diabetic rats where both basal and potassium-stimulated aldosterone production were higher than diabetic rats not given insulin. Although the reduced aldosterone production associated with untreated diabetes may have been a result of reduced in vivo exposure of adrenal tissue to angiotensin II, a chronic adrenotrophic influence of insulin could not be ruled out. In summary, insulin appears to be necessary for normal renin and aldosterone secretion in the diabetic rat.




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Copyright © 1985 by The Endocrine Society