急性胰腺炎大鼠胰腺过氧化酶体增殖物激活受体的表达

目的 检测ANP大鼠过氧化酶体增殖物激活受体γ(PPARγ)mRNA和蛋白表达的变化,探讨其意义.方法 36只SD大鼠按完全随机法分成对照组和ANP组.于术后3 h、6 h、12 h处死大鼠,分别检测血清淀粉酶含量,观察胰腺组织大体及镜下病理学改变,并采用RT-PCR和免疫组化分别检测胰腺PPARγmRNA和蛋白的表达.结果 ANP组术后6 h血清淀粉酶、胰腺大体及镜下病理分值分别为(7170.83±1635.59)U/L、6.67±1.03和13.00±2.36,均显著高于对照组(P<0.01);PPARγmRNA相对表达量为0.18±0.05,与对照组的0.22±0.03无显著差异;PPARγ蛋白相对表达量为4.17±0.98.较对照组的1.83±0.71显著升高(P<0.05).结论 ANP时PPARγ mRNA无明显下降,而PPARr蛋白明显增加.表明炎症损伤时,失活状态的PPARγ增多,同时反馈性抑制了PPARγ基因的表达.

The expression of PPARγmRNA and protein in rats with acute necrotizing pancreatitis

Objective To investigate the changes of PPARr mRNA and protein expressions in rats with ANP. Methods 36 rats were randomly divided into sham group and ANP group. The rats were sacrificed 3 h, 6 h,12 h after ANP induction, the levels of serum amylase were measured, the pancreatic pathological changes were determined and the expressions of pancreatic PPARr mRNA and protein was examined by RT- PCR and immunohistochemistry. Results In ANP group, the level of serum amylase at 6h was (7170.83± 1635.59) U/L, the scores of pathological changes were 6.67±1.03 and 13.00±2.36, which were much higher than those of sham group (P<0.01) ; the PPARr mRNA expression was 0.18±0.05, and there were no obvious differences compared with that of sham group (0.22±0.03 ) ; PPARr protein expression was 4.17 ±0.98, which was significantly higher than that of sham group (1.83±0.71, P<0.05). Conclusions Inflammatory injury resulted in increased deactivation of pancreatic acinar PPARr, meanwhile PPARr gene expression was inhibited by feedback.