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Myocardial Opioid Receptors in Conditioning and Cytoprotection

Heart Foundation Research Centre, Griffith University, PMB 50 Gold Coast Mail Centre, QLD 9726, Australia
Author to whom correspondence should be addressed.
Pharmaceuticals 2011, 4(3), 470-484;
Received: 25 January 2011 / Revised: 23 February 2011 / Accepted: 28 February 2011 / Published: 4 March 2011
(This article belongs to the Special Issue Opioids)
Opioid compounds and G-protein coupled opioid receptors (ORs) have been studied widely in terms of central nervous system (CNS) actions relating to pain management and drug abuse. Opioids are also linked to induction of mammalian hibernation, a natural state of tolerance involving prolonged and orchestrated shifts in cellular metabolism, growth and stress resistance. It is not surprising then that OR agonism induces acute or delayed cytoprotective states in myocardium, rendering ORs an attractive target for protection of cardiac tissue from the potentially fatal consequences of ischemic heart disease. Cardiac ORs are implicated in triggering/mediating so-called ‘conditioning’ responses, in which powerful cytoprotection arises following transient receptor ligation prior to or immediately following ischemic insult. These responses involve one or more OR sub-types engaging pro-survival kinase cascades to ultimately modulate cell stress and mitochondrial end-effectors. However, important questions remain regarding the role of endogenous opioids, OR signalling, and the transduction and mediation of these protective responses. We briefly review opioid-mediated cardioprotection, focussing on recent developments in signal transduction, the role of receptor ‘cross-talk’, and the effects of sustained OR ligand activation. View Full-Text
Keywords: opioids; preconditioning; postconditioning; cross-talk opioids; preconditioning; postconditioning; cross-talk
MDPI and ACS Style

Williams-Pritchard, G.; Headrick, J.P.; Peart, J.N. Myocardial Opioid Receptors in Conditioning and Cytoprotection. Pharmaceuticals 2011, 4, 470-484.

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