Journal
JOURNAL OF MOLECULAR AND CELLULAR CARDIOLOGY
Volume 33, Issue 11, Pages 2015-2022Publisher
ACADEMIC PRESS LTD- ELSEVIER SCIENCE LTD
DOI: 10.1006/jmcc.2001.1465
Keywords
ethanol; ischemic preconditioning; protein kinase C; signal transduction
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Funding
- NHLBI NIH HHS [HL 50688, HL 20648] Funding Source: Medline
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Recent studies reveal that brief ethanol exposure induces cardioprotection against simulated ischemia in cardiomyocytes by the activation of protein kinase C-epsilon. The present study tests the ability of ethanol to induce protection in rabbit hearts in which infarct size was the end-point and explores the signal transduction. pathways involved. In isolated rabbit hearts, 50mM ethanol infused for 5 min with 10 min of washout prior to 30 min of regional ischemia reduced infarct size (triphenyltetrazolium chloride staining) by 49%. Neither adenosine receptor blockade with 8-(p-sulfophenyl) theophylline nor the free radical scavenger N-2-mercaptopropionyl glycine inhibited the protection triggered by ethanol. In contrast, protein kinase C inhibition with. chelerythrine, protein tyrosine kinase inhibition with genistein, and blockade of ATP-sensitive potassium channels (K-ATP) with either 5-hydroxydecanoate or glibenclamide did abolish protection. Thus, transient ethanol exposure followed by washout prior to ischemia elicits a preconditioning-like effect involving protein kinase C, at least one protein tyrosine kinase, and X Tp channels, but neither adenosine nor free radicals. (C) 2001 Academic Press.
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