Effects of exogenous free radicals on electromechanical function and metabolism in isolated rabbit and guinea pig ventricle. Implications for ischemia and reperfusion injury. Export

@article{citeulike:697362, abstract = {Oxygen-derived free radicals have been implicated in the pathogenesis of cardiac dysfunction during ischemia, postischemic myocardial "stunning," and reperfusion injury. We investigated the effects of oxygen-derived free radicals on cardiac function in intact isolated rabbit hearts and single guinea pig ventricular myocytes. In the intact rabbit ventricle, exposure to free radical-generating systems caused increased cellular K+ efflux, shortening of the action potential duration, changes in tension, and depletion of high energy phosphates similar to ischemia and metabolic inhibition. In patch-clamped single ventricular myocytes, free radical-generating systems activated ATP-sensitive K+ channels, decreased the calcium current, and caused cell shortening by irreversibly inhibiting glycolytic and oxidative metabolism. The results suggest that free radicals generated during ischemia and reperfusion may contribute to electrophysiologic abnormalities and contractile dysfunction by inhibiting glycolysis and oxidative phosphorylation. Inhibition of metabolism by free radicals may be an important factor limiting functional recovery from an ischemic insult after reestablishment of effective blood flow.}, address = {Department of Medicine, UCLA School of Medicine, Los Angeles, CA 90024.}, author = {Goldhaber, J. I. and Ji, S. and Lamp, S. T. and Weiss, J. N.}, citeulike-article-id = {697362}, citeulike-linkout-0 = {http://view.ncbi.nlm.nih.gov/pubmed/2723059}, citeulike-linkout-1 = {http://www.hubmed.org/display.cgi?uids=2723059}, issn = {0021-9738}, journal = {J Clin Invest}, keywords = {ap, guinea, ischemia, pig}, month = {June}, number = {6}, pages = {1800--1809}, posted-at = {2006-06-15 20:32:33}, priority = {5}, title = {Effects of exogenous free radicals on electromechanical function and metabolism in isolated rabbit and guinea pig ventricle. Implications for ischemia and reperfusion injury.}, url = {http://view.ncbi.nlm.nih.gov/pubmed/2723059}, volume = {83}, year = {1989} }

TY - JOUR ID - citeulike:697362 L3 - citeulike-article-id:697362 N2 - Oxygen-derived free radicals have been implicated in the pathogenesis of cardiac dysfunction during ischemia, postischemic myocardial "stunning," and reperfusion injury. We investigated the effects of oxygen-derived free radicals on cardiac function in intact isolated rabbit hearts and single guinea pig ventricular myocytes. In the intact rabbit ventricle, exposure to free radical-generating systems caused increased cellular K+ efflux, shortening of the action potential duration, changes in tension, and depletion of high energy phosphates similar to ischemia and metabolic inhibition. In patch-clamped single ventricular myocytes, free radical-generating systems activated ATP-sensitive K+ channels, decreased the calcium current, and caused cell shortening by irreversibly inhibiting glycolytic and oxidative metabolism. The results suggest that free radicals generated during ischemia and reperfusion may contribute to electrophysiologic abnormalities and contractile dysfunction by inhibiting glycolysis and oxidative phosphorylation. Inhibition of metabolism by free radicals may be an important factor limiting functional recovery from an ischemic insult after reestablishment of effective blood flow. IS - 6 JF - J Clin Invest SN - 0021-9738 AD - Department of Medicine, UCLA School of Medicine, Los Angeles, CA 90024. EP - 1809 TI - Effects of exogenous free radicals on electromechanical function and metabolism in isolated rabbit and guinea pig ventricle. Implications for ischemia and reperfusion injury. VL - 83 SP - 1800 KW - ap KW - guinea KW - ischemia KW - pig AU - Goldhaber, JI AU - Ji, S AU - Lamp, ST AU - Weiss, JN PY - 1989/06// UR - http://view.ncbi.nlm.nih.gov/pubmed/2723059 ER -