The Journal of Experimental Medicine
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J. Exp. Med., Volume 189, Number 11, June 7, 1999 1699-1706

Exercise Provides Direct Biphasic Cardioprotection via Manganese Superoxide Dismutase Activation

By Nobushige Yamashita,* Shiro Hoshida,*Dagger Kinya Otsu,* Michio Asahi,* Tsunehiko Kuzuya,* and Masatsugu Hori*

From the * Division of Cardiology,  The First Department of Medicine, Osaka University Medical School, Suita, Osaka 565-0871, Japan; and the Dagger  Cardiovascular Division, Osaka Rosai Hospital, Sakai, Osaka 591-8025, Japan

Epidemiologic investigations have shown that exercise reduces morbidity and mortality from coronary artery disease. In this study, using a rat model, we attempted to determine whether exercise can reduce ischemic injury to the heart and elucidate a mechanism for the cardioprotective effect of exercise. Results showed that exercise significantly reduced the magnitude of a myocardial infarction in biphasic manner. The time course for cardioprotection resembled that of the change in manganese superoxide dismutase (Mn-SOD) activity. The administration of the antisense oligodeoxyribonucleotide to Mn-SOD abolished the expected decrease in infarct size. We showed that the level of tumor necrosis factor alpha  (TNF-alpha ) and interleukin 1beta (IL-1beta ) increased after exercise. The simultaneous administration of the neutralizing antibodies to the cytokines abolished the exercise-induced cardioprotection and the activation of Mn-SOD. Furthermore, TNF-alpha can mimic the biphasic pattern of cardioprotection and activation of Mn-SOD. An antioxidant completely abolished cardioprotection and the activation of Mn-SOD by exercise or the injection of TNF-alpha as well as exercise-induced increase in TNF-alpha and IL-1beta . The production of reactive oxygen species and endogenous TNF-alpha and IL-1beta induced by exercise leads to the activation of Mn-SOD, which plays major roles in the acquisition of biphasic cardioprotection against ischemia/reperfusion injury in rats.

Key words: free radical;  tumor necrosis factor;  interleukin 1;  infarct size;  N-2-mercaptopropionyl glycine


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