AJP - Heart and Circulatory Physiology, Vol 266, Issue 6 2568-H2572, Copyright © 1994 by American Physiological Society

ARTICLES

NADH oxidoreductase is a major source of superoxide anion in bovine coronary artery endothelium

K. M. Mohazzab, P. M. Kaminski and M. S. Wolin
Department of Physiology, New York Medical College, Valhalla 10595.

In this study we examined the intracellular sources of superoxide anion (O2-.) in cultured bovine coronary endothelium, employing lucigenin (250 microM)-elicited chemiluminescence (CL). In the homogenate from these cells, 100 microM NADPH increased O2-. by 81% from 8.9 +/- 1.5 to 16.0 +/- 1.5 x 10(5) cpm/mg protein (P < 0.01, n = 8). In the presence of 100 microM NADH, however, CL increased by 458% from 8.9 +/- 1.6 to 49.6 +/- 12.0 x 10(5) cpm/mg protein (P < 0.01, n = 8). Scavengers of O2-., superoxide dismutase (100 micrograms/ml), or 4,5-dihydroxy-1,3-benzenedisulfonic acid disodium salt (Tiron, 10 mM) inhibited NADH-mediated CL by 70 and 83%, respectively. Neither hypoxanthine (100 microM) nor antimycin (10 microM)+succinate (5 mM) had any significant effect on basal CL levels, thereby excluding xanthine oxidase and mitochondria, respectively, as a detectable sources of O2-. generation. The presence of NAD+ (100 microM) and lactate (1 mM) increased CL by 88% (n = 8, P < 0.01). In the intact cells, basal production of CL was increased by 205% (P < 0.01) by 5 mM lactate, but not by 5 mM pyruvate, and CL was inhibited by 10 mM Tiron, suggesting the reduction of cytosolic NAD by lactate dehydrogenase stimulates O2-. production. Diphenyliodonium at 1 and 10 microM inhibited both NADH-mediated CL in homogenate and lactate-mediated CL in intact endothelium by 50 and 33%, respectively.(ABSTRACT TRUNCATED AT 250 WORDS)

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