The JAK/STAT pathway is essential for opioid-induced cardioprotection: JAK2 as a mediator of STAT3, Akt, and GSK-3 beta

American Journal of Physiology. Heart and Circulatory Physiology
Eric R GrossGarrett J Gross

Abstract

We examined the role for the JAK/STAT signaling pathway in acute opioid-induced cardioprotection (OIC) and whether opioid-induced glycogen synthase kinase-3beta (GSK-3 beta) inhibition is mediated by the JAK/STAT pathway. Rats underwent 30 min of ischemia and either 5 min or 2 h of reperfusion, followed by tissue isolation for molecular analysis or infarct size assessment, respectively. Rats were treated with vehicle, morphine (300 microg/kg), the delta-opioid agonist fentanyl isothiocynate (FIT, 10 microg/kg), or the GSK inhibitor SB-216763 (SB21, 600 microg/kg) 10 min before ischemia. Five minutes before opioid or SB21 treatment, some rats received the putative JAK2 inhibitor AG-490 (3 mg/kg) or the putative JAK3 inhibitor ZM-449829 (3 mg/kg). H9C2 cardiomyoblast cells were also used to investigate FIT-induced signaling (1 microM) in vitro via molecular analysis. Morphine induced the phosphorylation of JAK2, yet not JAK1, in the area at risk. Morphine, FIT, and SB21 also reduced infarct size compared with vehicle (water) when administered before ischemia [43.0 +/- 2.8, 39.1 +/- 3.1, and 42.1 +/- 2.5 (*P < 0.001, respectively) vs. 58.1 +/- 1.3%, respectively]. AG-490 abrogated OIC, whereas ZM-449829 had no effect on OIC. Cardi...Continue Reading

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