Abstract
Objective To evaluate the role of different opioid receptors in sufentanil postconditioning-induced attenuation of myocardial ischemia-reperfusion (I/R) injury in rats.Methods Fifty adult male Sprague-Dawley rats,aged 4-6 months,weighing 200-330 g,were randomly divided into 9 groups:I/R group (n =7),ischemic postconditioning (IPC) group (n =7),sufentanil postconditiong (SP) group (n =6),κ-opioid receptor antagonist nor-binaltorphimine (nor-BNI) + SP group (group BNI + SP,n =5),δ-opioid receptor antagonist naltrindole + SP group (group NTD + SP,n =5) and μ-opioid receptor antagonist CTOP + SP group (group CTOP +SP,n =5).Myocardial I/R was produced by 30 min occlusion of left anterior descending branch of coronary artery followed by 120 min reperfusion.IPC was induced by 3 episodes of 10 s reperfusion followed by 10 s ischemia at the end of 30 min myocardial ischemia.Sufentanil 1 μg/kg was injected intravenously at 5 min before reperfusion in SP group.In groups BNI + SP,NTD + SP and CTOP + SP,nor-BNI 5 mg/kg,naltrindole 5 mg/kg and CTOP 1 mg/kg were injected intravenously,respectively,before SP and the corresponding doses of nor-BNI,naltrindole and CTOP were injected intravenously,respectively,at 5 min before reperfusion.Arterial blood samples were collected at 120 min of reperfusion for measurement of the plasma cardiac tropnin I (cTnI) concentration.The rats were then sacrificed and hearts removed for determination of myocardial infarct size (IS) and area at risk (AAR).IS/AAR was calculated.Results Compared with I/R group,the plasma cTnI concentration and IS/AAR were significantly decreased in groups IPC,SP,BNI + SP and NTD + SP (P ＜ 0.05),and no significant change was found in the plasma cTnI concentration and IS/AAR in groups CTOP + SP,NTD,BNI and CTOP (P ＞ 0.05).Compared with SP group,IS/AAR was increased in NTD + SP and BNI + SP groups and the plasma cTnI concentration and IS/AAR were significantly increased in CTOP + SP group (P ＜ 0.05).Conclusion The μ-,κ-and δ-opioid receptors mediate sufentanil postconditioning-induced attenuation of myocardial I/R injury in rats. Key words: Sufentanil ; Receptors, opioid ; Myocardial reperfusion injury
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