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- W2069971283 abstract "The role of mitochondrial transporters in the cardioprotection of rat hearts exposed to high [K+]-low [Ca2+]-cardioplegia (CPG) and ischemia and reperfusion (I/R) was studied through the mechano-energetic consequences of target drugs. The total heat rate (Ht) and the left intraventricular pressure (LVP) were simultaneously measured in isolated perfused hearts (30 degrees C and 1 Hz) inside a flow-calorimeter during 45 minutes of no-flow I and 45 minutes of R. After stabilization (C) they were pretreated with CPG and 100 microM 5-hydroxidecanoate (5HD, selective mKATP blocker) without and with 10 or 30 microM clonazepam (Clzp, mNCX inhibitor), 30 microM diazoxide (Dzx, selective mKATP opener), 1 microM Ru360 (selective Ca-uniporter blocker), and 0.2 microM cyclosporine-A, (mPTP inhibitor, before I and during R). Before I, 5-hydroxydecanoate in CPG increased the resting heat rate (17.83 +/- 3.55 mW/g) without changing the stunning. Clzp 30 microM + CPG + 5-hydroxydecanoate reduced the postischemic P with diastolic contracture and high Ht. Dzx protected C-hearts from stunning but increased it in CPG hearts with low economy (P/Ht) as well as Ru360. Cyclosporine-A did not modify the stunning of C or CPG ischemic hearts, suggesting that the mPTP was not opened.Mitochondria have a precise role for determining cardioprotection or stunning in high-K+ cardioplegic rat hearts under I/R. Known protective drugs, such as Dzx and Ru360, which reduce the mitochondrial Ca2+-uptake, increased the stunning of CPG-rat hearts and reduced muscle economy, whereas 5-hydroxydecanoate and Clzp together increased the stunning by inducing mitochondrial Ca2+ overload." @default.
- W2069971283 created "2016-06-24" @default.
- W2069971283 creator A5040996296 @default.
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- W2069971283 date "2009-09-01" @default.
- W2069971283 modified "2023-10-07" @default.
- W2069971283 title "CARDIAC Role of the Mitochondrial Ca2+ Transporters in the High-[K+]o Cardioprotection of Rat Hearts Under Ischemia and Reperfusion: A Mechano-Energetic Study" @default.
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- W2069971283 doi "https://doi.org/10.1097/fjc.0b013e3181b04ce3" @default.
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