DEGRADATION OF THE CARDIAC SARCOPLASMIC RETICULUM IN ACUTE MYOCARDIAL ISCHEMIA
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概要
- 論文の詳細を見る
The degradation of the sarcoplasmic reticulum (SR) in acute myocardial ischemia was studied with references to the regional irreversibility and to the mechanism of ischemic degradation by the measurements of Ca^<++>-stimulated ATPase activity and composition of the major ATPase protein of the SR and activity of cathepsin B of the SR and lysosome (Ly) fractions. Ca^<++>-stimulated ATPase activity decreased to 66% of that of the non-ischemic portion at 20 min after coronary ligation in the subendocardium (Endo) and to 44% at 30 min in the subepicardium (Epi). composition of the major ATPase protein decreased to 55 % and 73% at 30 min in Endo and Epi, respectively. In both SR and Ly fractions cathepsin B exhibited the maximal activity at 6.0-6.5, and pH dependent. And incubation of the SR at pH 6.0 induced the degradation of the ATPase protein quite similarly to that in vivo ischemia. These results suggest that the degradation of the SR membrane of ischemic myocardial cells begins earlier in Endo 20 to 30 min after the cease of the coronary blood flow, and extends to Epi later. Cathepsin B is strongly conceivable to play an initial role of necrotic process of the ischemic myocardial cells by activation inside of the SR in ischemic acidic state.
- 社団法人日本循環器学会の論文
- 1987-04-20
著者
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KONNO Noburu
The Third Department of Internal Medicine, Showa University School of medicine
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Geshi Eiichi
The Third Department of Internal Medicine, Showa University School of Medicine
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Komo Noburu
The Third Department Of Internal Medicine School Of Medicine Showa University
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Yanagishita Toshikuni
The Third Department of Internal Medicine
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Yanagishita Toshikuni
The Third Department Of Internal Medicine School Of Medicine Showa University
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Katagiri Takashi
The Third Department Of Internal Medicine Showa University
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Yanagishita Toshikuni
昭和大学 第3内科
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