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The SAFE pathway is involved in the postconditioning mechanism of oxytocin in isolated rat heart

Mirali Polshekan,V. Khori,A. Alizadeh,M. Ghayour-Mobarhan,Mohsen Saeidi,Y. Jand,Maryam Rajaei,Gholamreza Farnoosh,K. Jamialahmadi

Published 2019 in Peptides

ABSTRACT

HIGHLIGHTSOxytocin triggers anti‐infarct, anti‐arrhythmia and anti‐apoptotic effects through SAFE pathway activation against I/R injury in the early reperfusion phase.STAT3 and NOS inhibitors and a mitoKATP blocker abrogated the cardioprotective effects of oxytocin.Oxytocin evokes NO release, mitoKATP opening and JAK/STAT3 activation to provide cardioprotective effects against IR injury.Oxytocin through SAFE pathway activation protects cardiomyocites against I/R injury and it considered as a clinically useful drug in patients with coronary artery diseases. ABSTRACT Oxytocin (OT) has a postconditioning effect against the ischemia‐reperfusion (I/R) injury. However, its precise cardioprotection mechanism at the early reperfusion phase remains under debate. Our previous study revealed that OT postconditioning (OTpost) is cardioprotective by activating the Reperfusion Injury Salvage Kinase (RISK) pathway. Therefore, the present study is aimed to determine the biological effects of OTpost via the OT receptor and the activation of the JAK/STAT3 signaling pathway, mitochondrial adenosine triphosphate‐dependent potassium channel (mitoKATP), nitric oxide (NO) release, and its anti‐apoptotic effects against I/R injury in an isolated rat heart model. Sixty‐three rats were randomly allocated to one of nine groups. OT was perfused 40min prior to the regional ischemia or 15min at the early reperfusion phase. AG490 (a JAK/STAT3 inhibitor), 5HD (a mitoKATP blocker), atosiban (an OT receptor antagonist), L‐NAME (a nonspecific nitric oxide synthase inhibitor) were applied either alone or in combination with OT during the pre‐ischemia phase and/or in the early reperfusion phase. Myocardial infarct size, hemodynamic factor, ventricular arrhythmia, coronary flow, cardiac biochemical marker, and the apoptosis index were determined at the end of reperfusion. Oxytocin postconditioning reduced infarct size, lactate dehydrogenase activity, arrhythmia score, ventricular fibrillation, and apoptosis. Moreover, AG490, 5HD, atosiban, and L‐NAME abrogated the cardioprotective effects of OT. Our results demonstrated that the cardioprotective effects of OT are mediated by NO release, and the activation of mitoKATP and the SAFE pathway through the JAK/STAT3 signaling cascade that finally lead to decrease in the apoptosis index during the early reperfusion phase.

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