Inhibition of glycogen synthase kinase enhances isoflurane-induced protection against myocardial infarction during early reperfusion in vivo

Anesthesia and Analgesia
Paul S PagelDavid C Warltier

Abstract

Inhibition of glycogen synthase kinase (GSK)-beta protects against ischemia-reperfusion injury. Brief exposure to isoflurane before and during early reperfusion after coronary artery occlusion also protects against infarction. Whether GSK-beta mediates this action is unknown. We tested the hypothesis that GSK inhibition enhances isoflurane-induced postconditioning. Rabbits (n = 88; 6 to 7 per group) subjected to a 30-min coronary occlusion followed by 3 h reperfusion received saline, isoflurane (0.5 or 1.0 minimum alveolar concentration [MAC]) administered for 3 min before and 2 min after reperfusion, the selective GSK inhibitor SB216763 (SB21; 0.2 or 0.6 mg/kg), or 0.5 MAC isoflurane plus 0.2 mg/kg SB21. Other groups of rabbits pretreated with phosphatidylinositol-3 kinase (PI3K) inhibitor wortmannin (0.6 mg/kg), 70-kDa ribosomal protein s6 kinase (p70s6K) inhibitor rapamycin (0.25 mg/kg), or mitochondrial permeability transition pore (mPTP) opener atractyloside (5 mg/kg) received 0.6 mg/kg SB21 or 0.5 MAC isoflurane plus 0.2 mg/kg SB21. Additional groups received the mPTP inhibitor, cyclosporin A (5 mg/kg), plus 0.2 mg/kg SB21 with or without atractyloside pretreatment. Isoflurane (1.0 but not 0.5 MAC) and SB21 (0.6 but not 0...Continue Reading

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