Gender and aging do not impair opioid-induced late preconditioning in rats

Ken Shinmura, Maiko Nagai, Kayoko Tamaki, Roberto Bolli

Research output: Contribution to journalArticle

27 Citations (Scopus)

Abstract

Opioids have been shown to confer late preconditioning against ischemia/reperfusion injury in several species. However, it is unknown whether gender or aging affects opioid-induced cardioprotection. Isolated perfused hearts from Fischer 344 rats were subjected to 20 min of global ischemia followed by 20 min of reperfusion. BW373U86, a δ-opioid receptor agonist, was administered s.c. at varying doses (0.1, 0.33, 1.0 mg/kg) 24 h before (BW0.1, BW0.33 and BW1.0, respectively). In 12-week-old male (YM) rats, the recovery of LV developed pressure (LVDP) after ischemia/reperfusion improved significantly in BW0.33 and BW1.0, compared with the control (C). In 78-week-old male (OM) rats, the recovery of LV function after ischemia/reperfusion improved and the total release of CK and LDH during reperfusion was attenuated in BW1.0. In 12-week-old female (YF) rats, the recovery of LV function improved only in BW0.33 but not in BW0.1 and BW1.0. The cardioprotective effect afforded by BW373U86 was completely abolished by NS-398, a COX-2 selective inhibitor, in YM, YF, and OM, although NS-398 in itself did not affect myocardial ischemia/reperfusion injury. The levels of 6-keto-PGF (a stable metabolite of PGI2) in coronary effluent during reperfusion were higher in the BW373U86-pretreated group that showed cardioprotection than in C and this increase in PGI2 production was also inhibited by NS-398 in YM, YF, and OM. In conclusion, B W373U86-induced late preconditioning can be observed in aged and female hearts. A COX-2-dependent increase in PGI2 production is essential for BW373U86-induced late PC in both sexes and in both young and old rats.

Original languageEnglish
Pages (from-to)46-55
Number of pages10
JournalBasic Research in Cardiology
Volume99
Issue number1
DOIs
Publication statusPublished - 2004 Jan

Keywords

  • Aging
  • Gender
  • Opioid
  • Preconditioning
  • Prostacylin

ASJC Scopus subject areas

  • Physiology
  • Cardiology and Cardiovascular Medicine
  • Physiology (medical)

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