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Am J Physiol Endocrinol Metab 265: E362-E366, 1993;
0193-1849/93 $5.00
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AJP - Endocrinology and Metabolism, Vol 265, Issue 3 E362-E366, Copyright © 1993 by American Physiological Society

ARTICLES

Pressor doses of angiotensin II increase insulin-mediated glucose uptake in normotensive men

R. R. Townsend and D. J. DiPette
Department of Internal Medicine, University of Texas Medical Branch, Galveston 77555-0566.

The effect of pressor doses of angiotensin II infused intravenously on insulin-mediated glucose uptake was determined in normotensive men. A 3-h hyperinsulinemic euglycemic clamp was employed in 14 normotensive subjects to determine insulin-mediated glucose uptake with or without an infusion of angiotensin II (approximately 15 ng.kg-1.min-1), which increased blood pressure by 20/15 mmHg (systolic/diastolic). Addition of angiotensin II increased whole body glucose uptake by 15% (9.2 +/- 0.5 vs. 10.8 +/- 0.8 mg.kg-1 x min-1; P = 0.011), and glucose oxidation (determined by indirect calorimetry) by 25% (4.0 +/- 0.3 vs. 4.9 +/- 0.4 mg.kg-1 x min-1; P < 0.05) over insulin alone. There was no significant increase in hepatic glucose output during angiotensin II infusion (2.2 +/- 0.1 vs. 2.4 +/- 0.1 mg.kg-1 x min-1; P = NS). We conclude that angiotensin II in pressor doses increases insulin-mediated glucose disposal and oxidation. The mechanism for this may involve a redirection of blood flow into skeletal muscle during angiotensin II infusion or a direct biochemical action of angiotensin II. Although performed in lean normotensive subjects, these results cast doubt on a significant role for angiotensin II in the insulin resistance associated with essential hypertension.


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