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• W2167953429 abstract "Glycogen synthase kinase (GSK) inhibition produced by ischemic preconditioning has been previously shown to be regulated through phosphatidylinositol-3 kinase (PI3K). Therefore, we determined whether opioid-induced cardioprotection (OIC) occurs during reperfusion by altering GSK phosphorylation through PI3K and target of rapamycin (TOR). Furthermore, we determined if selective GSK inhibitors, SB216763(SB21) or SB415286(SB41), emulate OIC. Rats were treated with the nonselective opioid agonist, morphine (MOR, 0.3 mg/kg), the delta-selective opioid agonist BW373U86 (BW, 1 mg/kg), or the GSK inhibitors, SB21 (0.6 mg/kg) or SB41(1.0 mg/kg), either 10 minutes before ischemia or 5 minutes before reperfusion. Five minutes before opioid or SB21 treatment, some rats received either the PI3K inhibitor wortmannin (15 microg/kg) or LY294002 (0.3 mg/kg) or the TOR inhibitor rapamycin (3 microg/kg). After 30 minutes of ischemia followed by 2 hours of reperfusion, infarct size was assessed. MOR, BW, SB41, and SB21 reduced infarct size compared with vehicle when administered before ischemia (42.9+/-2.6, 40.3+/-2.3, 46.6+/-1.6, 42.2+/-1.8 versus 60.0+/-1.1%, respectively; P<0.001) and showed similar protection when administered 5 minutes before reperfusion (43.6+/-2.3, 40.2+/-2.6, 44.8+/-2.8, 39.4+/-0.8%, respectively; P<0.001). Wortmannin, LY294002, and rapamycin were found to inhibit OIC; however, they did not abrogate SB21-induced infarct size reduction. At 5 minutes of reperfusion, both MOR and BW increased P-GSKbeta at Ser9 in the ischemic zone compared with vehicle (181+/-20, 178+/-15 versus 75+/-17 DU, respectively; P<0.05), and this effect was abrogated by prior administration of wortmannin or rapamycin in MOR-treated rats. Furthermore, no differences were seen in phosphorylation of GSKalpha (Ser21 or Tyr279) or phosphorylation of GSKbeta (Tyr216). These data indicate that OIC occurs via the phosphorylation of GSKbeta at Ser9 during reperfusion." @default.
• W2167953429 created "2016-06-24" @default.
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• W2167953429 creator A5030692703 @default.
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• W2167953429 date "2004-04-16" @default.
• W2167953429 modified "2023-09-30" @default.
• W2167953429 title "Opioid-Induced Cardioprotection Occurs via Glycogen Synthase Kinase β Inhibition During Reperfusion in Intact Rat Hearts" @default.
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• W2167953429 doi "https://doi.org/10.1161/01.res.0000122392.33172.09" @default.
• W2167953429 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/14976126" @default.
• W2167953429 hasPublicationYear "2004" @default.
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