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- W2038256754 abstract "1. The calpains have been proposed to be activated following cardiac ischaemia and to contribute to myocyte damage after myocardial infarction (MI). In this study, the activity of calpains I and II in the infarcted and non-infarcted rat myocardium and the action of the selective calpain inhibitor, CAL 9961, has been investigated. 2. MI was induced by permanent ligation of the left coronary artery. One, 3, 7 and 14 days post MI, the enzymes calpain I and II were separated from homogenates of the interventricular septum (IS) and left ventricular free wall (LVFW) by chromatography on DEAE-Sepharose. The activity of the calpains was measured in sham-operated and MI animals chronically treated with placebo or CAL 9961 (15 mg kg(-1) d(-1) s.c.) in a synthetic substrate assay. Treatment was started 3 days before MI induction. 3. Calpain I activity reached highest values in IS 14 days post MI, whereas maximum activity of calpain II was measured in LVFW 3 days post MI. In experiments in vitro, CAL 9961 completely inhibited both calpains. In vivo, chronic treatment of MI animals with CAL 9961 partially prevented the increase in calpain I activity in IS and reduced calpain II activity in LVFW to sham levels. 4. Our findings demonstrate that calpains I and II are activated after MI, however, both enzymes differ in their regional and temporal activation within the infarcted myocardium. Chronic inhibition of these enzymes with CAL 9961 might limit the calpain-induced myocardial damage and preserve cardiac structural integrity post MI." @default.
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- W2038256754 date "2002-04-01" @default.
- W2038256754 modified "2023-09-24" @default.
- W2038256754 title "Activity profile of calpains I and II in chronically infarcted rat myocardium - influence of the calpain inhibitor CAL 9961" @default.
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- W2038256754 doi "https://doi.org/10.1038/sj.bjp.0704661" @default.
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