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AJP - Heart and Circulatory Physiology, Vol 263, Issue 2 321-H326, Copyright © 1992 by American Physiological Society
ARTICLES |
B. Tesfamariam and R. A. Cohen
Robert Dawson Evans Department of Clinical Research, Boston University School of Medicine, Massachusetts 02118.
Impaired endothelium-dependent relaxation occurs in diabetic rabbit aorta and normal aorta exposed to elevated concentrations of glucose and is prevented by cyclooxygenase inhibitors. The role of free radicals in the endothelial cell impairment was examined with free radical scavengers and in aortas from rabbits fed with probucol (1% wt/wt, a lipid-soluble antioxidant). Rings of aorta suspended for measurement of isometric tension were incubated for 6 h in control (5.5 mM) or elevated (44 mM) glucose. Impairment of endothelium-dependent relaxation to acetylcholine caused by exposure to elevated glucose was prevented by superoxide dismutase, catalase, deferoxamine, or allopurinol and did not occur in aortas from probucol-fed rabbits. Similarly, impairment of acetylcholine relaxations in aortas from alloxan-induced diabetic rabbits was restored to normal by superoxide dismutase. Oxygen-derived free radicals generated by xanthine oxidase also caused impaired acetylcholine relaxations. Exposure of aortic segments to elevated glucose or to xanthine oxidase caused a significant increase in release of immunoreactive prostanoids. These data indicate that the endothelial cell dysfunction caused by elevated glucose is mediated by free radicals that are likely generated through the increased cyclooxygenase catalysis occurring in the endothelium. Treatment with antioxidants protects against impaired endothelium-dependent relaxations caused by elevated glucose.
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