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Coronary endothelial dysfunction in the insulin-resistant state is linked to abnormal pteridine metabolism and vascular oxidative stress.

Abstract：

OBJECTIVES:We investigated whether abnormal pteridine metabolism is related to coronary endothelial dysfunction in insulin-resistant subjects. BACKGROUND:Depletion of tetrahydrobiopterin (BH(4)) and elevation of the 7,8-dihydrobiopterin (BH(2)) (activating and inactivating cofactors of nitric oxide synthase [NOS], respectively) contribute to impairment of NO-dependent vasodilation through reduction of NOS activity as well as increased superoxide anion generation in insulin-resistant rats. METHODS:Thirty-six consecutive nondiabetic, normotensive and nonobese subjects with angiographically normal coronary vessels were studied. Traditional coronary risk factors, plasma pteridine levels, activities of erythrocyte dihydropteridine reductase (DHPR), the recycling enzyme that converts BH(2) to BH(4) and lipid peroxide (LPO) levels were measured and coronary endothelial function was assessed with graded infusions of acetylcholine (ACh). RESULTS:When we divided patients into tertiles based on insulin sensitivity, we observed stepwise decreases in the maximal ACh-induced vasodilation and plasma BH(4)/7,8-BH(2) ratio, and increases in coronary LPO production as insulin sensitivity decreased. The ACh-induced vasodilation was positively correlated with insulin sensitivity, BH(4)/7,8-BH(2) ratio and DHPR activity. Furthermore, BH(4)/7,8-BH(2) was inversely correlated with DHPR activity and insulin sensitivity. In multiple stepwise regression analysis, BH(4)/BH(2) was independently related to ACh-induced vasodilation and accounted for 39% of the variance. However, no significant correlation existed between other traditional risk factors and BH(4)/7,8-BH(2). CONCLUSIONS:These results indicate that both abnormal pteridine metabolism and vascular oxidative stress are linked to coronary endothelial dysfunction in the insulin-resistant subjects.

journal_name

J Am Coll Cardiol

journal_title

Journal of the American College of Cardiology

authors

Shinozaki K,Hirayama A,Nishio Y,Yoshida Y,Ohtani T,Okamura T,Masada M,Kikkawa R,Kodama K,Kashiwagi A

doi

10.1016/s0735-1097(01)01659-x

subject

Has Abstract

pub_date

2001-12-01 00:00:00

pages

1821-8

issue

eissn

0735-1097

issn

1558-3597

pii

S0735-1097(01)01659-X

journal_volume

pub_type

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Coronary endothelial dysfunction in the insulin-resistant state is linked to abnormal pteridine metabolism and vascular oxidative stress.