摘要
目的:探讨过氧化物酶体增殖物激活受体γ(PPARγ)激动剂罗格列酮在大鼠肝脏缺血再灌注损伤中的作用及机制。方法:建立70%的大鼠肝脏缺血再灌注损伤模型,SD大鼠随机分为6组,对照组(control,C),假手术组(sham,S),缺血再灌注损伤(ischemia-reperfusion,IR)组,罗格列酮(rosiglitazone,Ros)预处理组,GW9662预处理组,以及Ros+GW9662预处理组。再灌注后,取静脉血检测肝血清酶(ALT、AST)水平,取肝脏组织TUNEL法检测缺血肝脏细胞凋亡指数(apoptotic index,AI),免疫组化检测Bcl-2,Bax,Caspase-3表达。结果:IR组和Ros组与假手术组相比肝脏细胞凋亡指数、Bax、Bcl-2及Caspase-3均升高。Ros处理组与IR组相比肝脏细胞凋亡指数、Bax及Caspase-3表达降低,Bcl-2表达升高,GW9662能阻断Ros的保护作用。单独应用GW9662时肝脏细胞凋亡指数、Caspase-3以及Bax表达比IR组升高,而Bcl-2降低。结论:PPARγ激动剂罗格列酮对肝脏缺血再灌注损伤有保护作用,它可能是通过上调Bcl-2表达,下调Bax和Caspase-3表达,抑制肝脏细胞凋亡而起作用的。
Objective:To investigate the effect of peroxisome proliferator-activated receptor γ(PPARγ) activator rosiglitazone in rat hepatic ischemia-reperfusion injury and its mechanism. Methods:The model of 70% warm ischemia-reperfusion injury was established in SD rats. Rats were divided randomly into 6 groups:control group, sham group, ischemia-reperfusion group, rosiglitazone group ,2-chloro-5-nitrobenzanilide (GW9662) treatment group and rosiglitazone plus GW9662 treatment group. After reperfusion, AST and ALT levels in serum were detected. The liver tissue was removed for t of the apoptotic index by TUNEL assay, and the expression of Bax, Bcl-2 and caspase-3 proteins in ischemic hepatocytes were detected by immunohistochemistry. Results: Compared with sham group, the apoptotic index of hepatocytes, expressions of Bax, Bcl-2 and Caspase-3 proteins in ischemia- reperfusion group and rosiglitazone group was greatly increased. Compared with ischemia-reperfusion group, the apoptosis index of hepatocytes, expressions of Bax and Caspase-3 in rosiglitazone group decreased, with Bcl-2 increased. GW9662 abolished the protective effect of rosiglitazone. GW9662 treated alone increased the apoptosis index of hepatocytes, Bax and Caspase-3, with the expression of Bcl-2 decreased. Conclusion:PPARγ activator rosiglitazone could protect against ischemia-reperfusion injury in rats, with its possible mechanism of upregulating the expression Of Bcl-2, inhibiting the expression of Bax and Caspase-3, and prohibiting hepatocyte apoptosis.
出处
《南京医科大学学报(自然科学版)》
CAS
CSCD
北大核心
2007年第11期1271-1273,1289,共4页
Journal of Nanjing Medical University(Natural Sciences)