Opioid peptide deltorphin II simulates the cardioprotective effect of ischemic preconditioning: role of δ₂-opioid receptors, protein kinase C, and K(ATP) channels.

L N Maslov, E I Barzakh, A V Krylatov, G A Chernysheva, T Krieg, N V Solenkova, A Yu Lishmanov, S Yu Cybulnikov, Y Zhang

Index: Bull. Exp. Biol. Med. 149(5) , 591-3, (2010)

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Abstract

The cardioprotective properties of a δ₂-opioid receptor agonist deltorphin II were studied in rats with coronary occlusion and reperfusion. Opioid receptor ligands and inhibitors (glybenclamide, chelerythrine, and 5-hydroxydecanoate) were injected intravenously before ischemia and reperfusion. A δ₂-opioid receptor agonist deltorphin II significantly decreased the infarction zone/risk zone index. This effect was abolished by naltrexone, naloxone methiodide, and δ₂-opioid receptor antagonist naltriben, but not by a δ₁-opioid receptor antagonist BNTX. The infarct-limiting effect of deltorphin II was not observed after inhibition of protein kinase C or blockade of mitochondrial K(ATP) channels.