人白介素-10基因转染对脑缺血再灌注损伤大鼠脑组织中NO、SOD、MDA、GSH-Px的影响

The effect of human IL-10 gene transfection on the SOD,GSH-Px,MDA and NO of the brain tissue following the focal cerebral ischemia-reperfusion in rats

目的观察人白介素-10(IL-10)基因转染对局灶脑缺血再灌注损伤大鼠脑组织中一氧化氮(NO)、超氧化物歧化酶(SOD)、丙二醛(MDA)、谷胱甘肽过氧化物(GSH-Px)的影响,探讨其缺血脑保护的作用机制。方法实验分正常对照组、缺血对照组、人IL-10基因转染组和空质粒组,采用Longa法建立大脑中动脉栓塞(MCAO)模型,采用立体定向脑室内注射的方式进行转染,然后分别用逆转录-聚合酶链式反应(RT-PCR)和酶联免疫吸附实验(ELISA)检测其转染效果,氯化三苯四氮唑(TTC)染色测定脑梗死体积,Longa 5分制进行神经行为学评分,同时按照试剂盒说明分别检测脑组织中NO、SOD、MDA、GSH-Px的含量。结果(1)人IL-10基因能有效整合到大鼠脑组织中并能高效分泌人IL-10,同时人IL-10基因转染能减少脑梗死体积和降低神经行为学评分;(2)正常对照组、缺血对照组、空质粒组和人IL-10基因转染组SOD的含量分别为214.28±13.73、170.69±12.26、175.20±13.76和195.77±13.20U/mgprot。GSH-Px的含量分别为25.73±1.72、19.91±1.81、19.32±1.37和22.70±2.22U/mgprot。与正常对照组相比,缺血对照组、空质粒组和人IL-10基因转染组SOD和GSH-Px的含量明显下降(P(0.01)。人IL-10基因转染组SOD和GSH-Px的含量则较缺血对照组、空质粒组明显升高(P(0.01)。缺血对照组和空质粒组之间无显著差异(P>0.05)。(3)正常对照组、缺血对照组、空质粒组和人IL-10基因转染组MDA的含量分别为6.29±0.33、8.75±0.44、8.66±0.51和7.70±0.31nmol/mgprot。NO的含量分别为1.07±0.11、1.87±0.18、1.93±0.33和1.44±0.10μmol/gprot。与正常对照组相比,缺血对照组、空质粒组和人IL-10基因转染组MDA和NO的含量明显升高(P(0.01)。人IL-10基因转染组MDA和NO的含量则较缺血对照组、空质粒组显著下降(P(0.01)。缺血对照组和空质粒组之间无显著差异(P>0.05)。结论人IL-10基因转染能降低大鼠局灶脑缺血再灌注损伤脑组织中MDA和NO的含量,同时能提升SOD和GSH-Px的含量,可能是其发挥缺血脑保护作用的机制之一。

Objective To observe the effect of human IL-10 gene transfection on the SOD,GSH-Px,MDA and NO of the brain tissue in the cerebral ischemia-reperfusion rats and to reveal the mechanism of neuroprotective effect of hIL-10. Methods SOD and GSH-Px activity in each group was determined. And the content of NO and MDA of each group was detected. Results （ 1 ） The contents of SOD and GSH-Px of brain tisse in the ischemia control group and in empty plasmid group were nmch lower than those in normal control group. The hIL-10 gene transfection could inhibit that decrease. （2） The contents of MDA and NO of brain tissue in the ischemia control group and in empty plasmid group were much higher than those in normal control group. The hIL-10 gene transfection could inhibit that increase. Conclusion hIL-10 plays neuropective effect maybe through modulating the imbalance of oxidant and antioxidant inducing by the cerebral ischemiareperfusion.