烟草烟雾对大鼠脑血管内皮细胞细胞间黏附分子-1表达及脑梗死体积的影响

Cigarette smoking on expression of ICAM-1 in rats' cerebral vascular endothelial cells and volumes of cerebral infarction

目的 研究烟草烟雾对大鼠脑血管内皮细胞超微结构 ,细胞间黏附分子 1(ICAM 1)mRNA、ICAM 1表达及大脑中动脉梗死体积的影响。方法 建立大鼠吸烟模型 ,原位杂交及免疫组化检测大鼠脑血管内皮细胞ICAM 1mRNA、ICAM 1的表达 ;建立大鼠左侧大脑中动脉梗死模型 ,测定梗死灶体积占同侧大脑半球体积百分比 ;电镜观察内皮细胞超微结构的改变。结果 (1)吸烟大鼠脑血管内皮细胞ICAM 1mRNA、ICAM 1表达增加 ,脑梗死灶体积增加 (长期大量吸烟组为4 3 7%± 3 7% ,对照组为 2 7 9%± 1 5 % ,P <0 0 5 ) ;内皮细胞超微结构改变显著。 (2 )戒烟大鼠脑血管内皮细胞ICAM 1mRNA、ICAM 1表达及脑梗死灶体积减小 ,内皮细胞超微结构病理改变明显恢复。结论 烟草烟雾使大鼠脑血管内皮细胞ICAM 1mRNA、ICAM 1表达及大鼠脑梗死灶体积增加 ,二者间存在剂量 效应关系。

Objective To investigate the influence of different doses and courses of cigarette smoking on the expression of ICAM-1 mRNA, ICAM-1 in rats' cerebral vascular endothelial cells and volumes of cerebral infartion.Methods 105 male Wistar rats(weight 210～220 g) were randomly grouped into long-term massive(20 cigarettes/d,75 d), short-term massive(20 cigarettes/d,30 d), long-term trifle (8 cigarettes/d, 75 d), anti-smoking(20 cigarettes/d, 30 d, denying 45 d)and normal control(no smoking). In situ hybridization, immunohistochemistry were used to determine the expression of ICAM-1 mRNA, ICAM-1 in rat's cerebral vascular endothelial cells (VECs).The VEC's structures were observed by electronic microscope. Left middle cerebral artery occlusion model was established and pathologic image analyzing system were used to determine the ratio of the volume of infarction in hemisphere of the same side. Results On contrast to normal controls, the expression of ICAM-1mRNA, ICAM-1 and the volume of infarction were increased in smoking(P<0.05);the expression of ICAM-1mRNA?ICAM-1 and the volume of infaction were decreased after anti-smoking and there was no significance versus control group. The structure of VEC was changed much in smoking, and partialy recoverd after anti-smoking. Conclusions The expression of ICAM-1mRNA, ICAM-1 in rats' cerebral VECs and the volumes of cerebral infarction were increased in smoking rats. There should have time and dose effect relationships between cigarette smoking and ICAM-1mRNA, ICAM-1, volumes of cerebral infarction; the ultrastructure might be changed in smoking. The above targets were recoverd after anti-smoking.