糖尿病大鼠局灶脑缺血/再灌注损伤与脑组织TGF-β1mRNA表达

目的:观察糖尿病和对照组鼠脑缺血/再灌注损伤与转化生长因子β₁(TGF-β₁) mRNA表达的异质性。方法:采用逆转录聚合酶链式反应(RT-PCR)检测大鼠中脑动脉阻塞(MCAO)后脑内TGF-β₁ mRNA表达水平,并且应用组织病理进行损伤程度评定。 结果:糖尿病组大鼠脑缺血及缺血/再灌损伤程度明显重于"相应对照组"。糖尿病及对照组大鼠在MCAO 2 h时TGF-β₁ mRNA表达量明显增高,后者增高比前者更为明显。再灌24 h后TGF-β₁ mRNA表达量下降,但仍高于假手术组。结论:糖尿病加重缺血/再灌性脑损伤|MCAO后TGF-β₁ mRNA表达增高可能是机体一种抗损伤反应,糖尿病组抗损伤反应下降。

Brain damage of cerebral ischemia/reperfusion and expression of TGF-

AIM:To observe the difference of cerebral inj ury following ischemia/reperfusion and mR-NA expression of TGF-β₁ between diabetic and non-diabetic rats.METHODS:At first,Wistar rats weredivided i nto two groups,non-diabetes and diabetes,and then two groups followed by sham,middle cerebralartery occlusion(MCAO) 2h and reperfusion 24 h after MCAO 2 h respectively.TGF-β₁ mRNA expressionwas measured by semi-quantitative reverse transcri ption polymerase chain reaction(RT-PCR);Cerebraldamage was eval uated by histopathology.RESULTS:In the same condition of ischemia or ischemia/reperfu-sion,inj uried area enlarged in DMgroups;The expressionlevel of TGF-β₁ mRNA increased at the ti me of 2h after MCAOi n non-diabetic group and diabetic group,especialy significantly in non-diabetic group withMCAO 2 h,and decreased at the time of reperfusion 24 h after MCAO 2 h,but still higher than that in theshamgroup.CONCLUSION:Diabetes mellitus exacerbated brain lesion following ischemia/repefusion,in-creased TGF-β₁ mRNA expresion after MCAO may be an anti-injury reaction,and anti-injury abilityis de-creased under diabetic condition.