Published online before print October 21, 2002, doi: 10.1161/01.HYP.0000040262.48405.A8
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(Hypertension. 2002;40:872.)
© 2002 American Heart Association, Inc.
Scientific Contributions |
Angiotensin II–Induced Insulin Resistance Is Associated With Enhanced Insulin Signaling
From the Department of Internal Medicine, Graduate School of Medicine, University of Tokyo (T.O., T.A., K.A., Y.C., N.S., M.F., H.K., Y.F., T.F.), Tokyo; The Institute for Adult Diseases, Asahi Life Foundation (T.O., H.S., M.A., H.O., Y.O., M.K.), Tokyo; Research Center for Advanced Science and Technology, University of Tokyo (N.N., H.A.), Tokyo; and Department of Cardiovascular Science and Medicine, Chiba University Graduate School of Medicine (I.K.), Chiba, Japan.
Correspondence to Tomoichiro Asano, Department of Internal Medicine, Graduate School of Medicine, University of Tokyo, Tokyo, Japan. E-mail asano-tky{at}umin.ac.jp
Angiotensin II (AII) is involved in the pathogenesis of both hypertension and insulin resistance, though few studies have examined the relationship between the two. We therefore investigated the effects of chronic AII infusion on blood pressure and insulin sensitivity in rats fed a normal (0.3% NaCl) or high-salt (8% NaCl) diet. AII infusion for 12 days significantly elevated blood pressure and significant insulin resistance, assessed by a hyperinsulinemic-euglycemic clamp study and glucose uptake into isolated muscle and adipocytes. High-salt loading exacerbated the effects of AII infusion significantly. Despite the insulin resistance, insulin-induced tyrosine phosphorylation of the insulin receptor and insulin receptor substrates, activation of phosphatidylinositol (PI) 3-kinase, and phosphorylation of Akt were all enhanced by AII infusion. Subsequently, to investigate whether oxidative stress induced by AII contributes to insulin resistance, the membrane-permeable superoxide dismutase mimetic, tempol, was administered to AII-infused rats. Chronic AII infusion induced an accumulated plasma cholesterylester hydroperoxide levels, indicating the increased oxidative stress, whereas the treatment with tempol normalized plasma cholesterylester hydroperoxide levels in AII-infused rats. In addition, the treatment with tempol normalized insulin resistance in AII-infused rats, shown as a decreased glucose infusion rate in the hyperinsulinemic euglycemic clamp study and a decreased insulin-induced glucose uptake into isolated skeletal muscle, as well as enhanced insulin-induced PI 3-kinase activation to those in the control rats. These results strongly suggest that AII-induced insulin resistance cannot be attributed to impairment of early insulin-signaling steps and that increased oxidative stress, possibly through impaired insulin signaling located downstream from PI 3-kinase activation, is involved in AII-induced insulin resistance.
Key Words: angiotensin II • insulin resistance • oxidative stress • glucose clamp technique • sodium • kinase
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