Circulation Research, Vol 58, 783-789, Copyright © 1986 by American Heart Association

ARTICLES

Atherosclerosis impairs endothelium-dependent vascular relaxation to acetylcholine and thrombin in primates

PC Freiman, GG Mitchell, DD Heistad, ML Armstrong and DG Harrison

To test the hypothesis that atherosclerosis impairs endothelium- dependent vascular relaxation, we examined the effect of the endothelium-dependent vasodilators acetylcholine and thrombin and the endothelium-independent vasodilator nitroglycerin on iliac arteries from normal cynomolgus monkeys and cynomolgus monkeys with diet-induced atherosclerosis. Rings of iliac artery were suspended in organ chambers at their optimal length for generating tension. After preconstriction with prostaglandin F2 alpha, cumulative concentration-response curves to acetylcholine, thrombin, and nitroglycerin were examined. The presence of endothelium was confirmed in each vessel by scanning electron microscopy. Atherosclerotic vessels showed morphologic evidence of moderate to severe atherosclerosis. Acetylcholine produced a maximal relaxation of 65 +/- 10% in the normal group and 27 +/- 10% in atherosclerotic vessels (P less than 0.05). Thrombin (10.0 U/ml) produced relaxation of 39 +/- 9% in the normal group and 13 +/- 7% in atherosclerotic iliac arteries (P less than 0.05). Nitroglycerin relaxed both normal and atherosclerotic blood vessels to an equal extent; maximal relaxation was 92 +/- 4% in normal vessels and 98 +/- 2% in atherosclerotic vessels. To determine if hypercholesterolemia alone produces an abnormality in endothelium-dependent relaxation, we performed two additional studies. First, because veins are exposed to hypercholesterolemia, but do not develop atherosclerosis, we studied relaxation responses to acetylcholine and thrombin in veins from normal monkeys and monkeys with diet-induced atherosclerosis. Veins from normal and atherosclerotic monkeys relaxed to a similar extent upon exposure to the endothelium-dependent vasodilators acetylcholine and thrombin.(ABSTRACT TRUNCATED AT 250 WORDS)

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