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摘要：
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| 目的 探讨辛伐他汀对兔蛛网膜下腔出血(SAH)后迟发性脑血管痉挛(CVS)中血管壁增殖的影响.方法 36只新西兰大白兔随机分为3组:①对照组,常规饲养并枕大池二次注入0.9%生理盐水;②SAH组,通过二次枕大池注血建立SAH模型;③辛伐他汀+SAH组,每日胃灌辛伐他汀5 ms/kg,连续7 d后建立SAH模型.各组兔模型前后行两次脑血管造影.灌注后取基底动脉组织制作病理切片,分别于光镜和透射电镜下观察其显微以及超微结构.采用免疫组化及免疫荧光方法检测基底动脉组织中增殖细胞核抗原(PCNA)及α-平滑肌肌动蛋白(α-SMA)表达量的变化,同时采用Real-Time PCR检测其血小板源性生长因子-B(PDGF-B)基因表达量的变化.采用SPSS10.0软件进行统计分析.结果 通过脑血管造影可以观察到二次注血后兔基底动脉出现明显的痉挛,管径变细;而给予辛伐他汀后,痉挛减轻.SAH组兔基底动脉壁略有增厚,电镜显示平滑肌细胞内合成旺盛;而给予辛伐他汀预处理后这些变化明显减轻.SAH组兔基底动脉管壁平滑肌细胞内α-SMA、PCNA、PDGF-B表达明显高于对照组(P＜0.05),而给予辛伐他汀后三者表达量明显降低(P＜0.05).结论 辛伐他汀可能通过抑制迟发性CVS中血管壁平滑肌细胞的增殖来缓解SAH后迟发性CVS.
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