(Circulation. 2003;107:896.)
© 2003 American Heart Association, Inc.
Basic Science Reports |
From Inotek Pharmaceuticals Corp, Beverly, Mass (P.P., P.B., J.G.M., L.V., A.D., E.S., C.S.); the Critical Care Division, Department of Internal Medicine, University Hospital, Lausanne, Switzerland (L.L.); the Department of Physiology, New York Medical College, Valhalla (P.M.K., Z.U., M.S.W.); the Department of Chemistry, Princeton University, Princeton, NJ (J.T.G.); and the Experimental Research Department and Institute of Human Physiology, Semmelweis University Medical School, Budapest, Hungary (C.S.).
Correspondence to Csaba Szabó, MD, PhD, DSc, Inotek Pharmaceuticals Corporation, Suite 419E, 100 Cummings Center, Beverly, MA 01915. E-mail szabocsaba{at}aol.com
Background Increased oxidative stress and dysregulation of nitric oxide have been implicated in the cardiotoxicity of doxorubicin (DOX), a commonly used antitumor agent. Peroxynitrite is a reactive oxidant produced from nitric oxide and superoxide in various forms of cardiac injury. Using a novel metalloporphyrinic peroxynitrite decomposition catalyst, FP15, and nitric oxide synthase inhibitors or knockout mice, we now delineate the pathogenetic role of peroxynitrite in rodent models of DOX-induced cardiac dysfunction.
Methods and Results Mice received a single injection of DOX (25 mg/kg IP). Five days after DOX administration, left ventricular performance was significantly depressed, and high mortality was noted. Treatment with FP15 and an inducible nitric oxide synthase inhibitor, aminoguanidine, reduced DOX-induced mortality and improved cardiac function. Genetic deletion of the inducible nitric oxide synthase gene was also accompanied by better preservation of cardiac performance. In contrast, inhibition of the endothelial isoform of nitric oxide synthase with N-nitro-L-arginine methyl ester increased DOX-induced mortality. FP15 reduced the DOX-induced increase in serum LDH and creatine kinase activities. Furthermore, FP15 prevented the DOX-induced increase in lipid peroxidation, nitrotyrosine formation, and metalloproteinase activation in the heart but not NAD(P)H-driven superoxide generation. Peroxynitrite neutralization did not interfere with the antitumor effect of DOX. FP15 also decreased ischemic injury in rats and improved cardiac function and survival of mice in a chronic model of DOX-induced cardiotoxicity.
Conclusions Thus, peroxynitrite plays a key role in the pathogenesis of DOX-induced cardiac failure. Targeting peroxynitrite formation may represent a new cardioprotective strategy after DOX exposure or in other conditions associated with peroxynitrite formation, including myocardial ischemia/reperfusion injury.
Key Words: cardiac function doxorubicin oxidative stress nitric oxide heart failure
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