陈戟;谭秀华;庞韬;詹鸿;

• 1:广州医科大学附属第三医院麻醉科
• 2:广东省计划生育专科医院

摘要(Abstract)：

目的探讨右美托咪定对全脑缺氧缺血损伤大鼠海马内星形胶质细胞中血管内皮细胞生长因子(Vascular endothelial growth factor,VEGF)表达的影响。方法取SD大鼠24只,体重250²80 g,采用随机数字表法将其分为3组(n=8):假手术组(S组)、常规复苏组(C组)和右美托咪定组(D组)。C组和D组采用窒息后心跳骤停法建立大鼠全脑缺氧缺血损伤模型,S组大鼠仅行气管插管不夹闭窒息,D组于气管夹闭前尾静脉注射负荷剂量右美托咪定4μg/kg,S组和C组分别给予等容量生理盐水。各组大鼠于自主循环恢复后12、24、48及72 h进行神经功能缺失评分(Neuropathy disability score,NDS),于72 h测定NDS后处死大鼠,取海马组织,采用TUNEL法标记检测海马神经元凋亡情况,采用免疫荧光双标法测定各组大鼠海马内星形胶质细胞VEGF的表达情况。结果与S组比较,C组各时点NDS评分均显著升高(P<0.05);D组大鼠在12 h时NDS评分与C组比较差异无统计学意义(P>0.05),D组大鼠在24、48和72 h三个时点NDS评分显著低于C组(P<0.05)。与S组比较,C组大鼠海马内神经元凋亡率和星形胶质细胞VEGF的表达均升高;与C组比较,D组大鼠海马内神经元凋亡率降低,星形胶质细胞VEGF的表达升高(P<0.05)。结论右美托咪定可减轻全脑缺氧缺血损伤大鼠脑损伤,降低海马内神经元的凋亡率,其机制可能与促进海马内星形胶质细胞上VEGF的表达有关。

关键词(KeyWords)： 右美托咪定;血管内皮生长因子;星形胶质细胞;脑缺血;脑保护

Abstract:

Keywords:

基金项目(Foundation):

作者(Authors): 陈戟;谭秀华;庞韬;詹鸿;

DOI: 10.14053/j.cnki.ppcr.201703001

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