PMID: 11327331May 1, 2001Paper

ERK and p38 MAP kinase activation are components of opioid-induced delayed cardioprotection

Basic Research in Cardiology
Ryan M FryerG J Gross

Abstract

Opioids have been previously shown to confer acute and delayed cardioprotection against a prolonged ischemic insult. We have extensively characterized the signal transduction pathway mediating acute cardioprotection and have suggested a role for extracellular signal regulated kinase (ERK) in this cardioprotection. Therefore, we attempted to determine a role for ERK and the stress activated MAP kinase, p38, in opioid-induced delayed cardioprotection by using selective inhibitors of these pathways. All rats were subjected to 30 min of ischemia and 2 h of reperfusion (I/R). Control animals, injected with saline 48 h prior to I/R, had an infarct size/area at risk (IS/AAR) of 61.6 +/- 1.6.48-h pretreatment with TAN-67 (30 mg/kg), a delta1-opioid receptor agonist, maximally reduced IS/AAR (31.2 +/- 6.5). The involvement of ERK was examined with PD 098059, a selective pharmacological antagonist which inhibits the upstream kinase, MEK-1, that phosphorylates and activates ERK. PD 098059 (0.3 mg/kg) did not alter IS/AAR when administered alone (60.7 +/- 4.9). However, PD 098059 (0.3 mg/kg) administration 30 min prior to TAN-67 (30 mg/kg) completely abolished cardioprotection (61.0 +/- 7.6). The selective p38 inhibitor, SB 203580 (1.0 mg/...Continue Reading

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