大鼠心肌缺血再灌注损伤时粘附分子CD40及CD40配体的表达

目的:探讨粘附分子CD40及CD40配体(CD40L)在心肌缺血再灌注损伤中的表达。方法:采用大鼠心肌缺血再灌注损伤模型,大鼠分7组:对照组(n=3)、单纯缺血30min、缺血30min再灌注1min、5min、10min、20min和30min组(各组n=6),利用流式细胞技术观察外周血CD40及CD40L的表达,并用免疫组织化学法观察CD40及CD40L在心肌中表达情况。结果:单纯30min缺血组(I_30min)的CD40及CD40L高于对照组(P＜0.05);在不同的再灌注时间中,CD40及CD40L在再灌注1min(R_1min)开始升高,R_5min达高峰,随后开始下降,R_30min达基线,其中R_5min、R_10min的CD40及CD40L比I_30min及对照组高(P＜0.05),免疫组织化学法显示CD40及CD40L在心肌细胞膜上表达,正常心肌细胞膜上表达较弱,损伤心肌细胞膜上表达较强。结论:提示心肌缺血再灌注损伤的发生可能与粘附分子CD40及CD40L的异常表达有关。

Expression of CD40-CD40L during rat myocardial ischemia-reperfusion injury

AIM: To investigate the expression of CD40 and CD40 ligand(CD40L) during myocardial ischemia/reperfusion injury in rats. METHODS: In the rat modal with myocardial ischemia/reperfusion(MI/R),the changes of CD40 and CD40L expression in blood and myocardial tissues were detected by flow cytometry and immunohistochemistry, respectively. There were seven animal groups in the study, including the normal group ( n= 3), the ischemia 30 min group(I 30 min , n= 6),the ischemia/reperfusion 1 min,5 min,10 min,20 min and 30 min groups(each group, n= 6). RESULTS: The indexes of the expression of CD40 and CD40L in I 30 min group were higher than those in control group,( P< 0.05); the indexes of R 5 min ,R 10 min groups were higher than those in the I 30 min group ( P< 0.05);the indexes were the highest in R 5 min and then decreased in R 10 min ,R 20 min ,R 30 min group. The immunohistochemical results revealed that. CD40-CD40L expression increased on the cardiocyte membraneduring the ischemia/reperfusion injury. CONCLUSION: CD40 and CD40L may participate in the development of myocardial ischemia/reperfusion injury.