电针百会、神庭穴对脑缺血再灌注大鼠学习记忆能力及海马CA1区突触超微结构的影响

摘要

Objective To observe the effect of electroacupuncture at Baihui (GV20) and Shenting (GV24) on learning-memory function and ultrastructure in hippocampal CA1 region of rats after cerebral ischmeia-reperfusion. Methods A total of 25 male Sprague-Dawley rats were randomly divided into sham group (n=6) and operation group (n=19). The operation group was occluded the left middle cerebral arter-ies with modified Longa's methods for 90 minutes and reperfused, and twelve qualified rats of them were randomly divided into model group (n=6) and electroacupuncture group (n=6), the later accepted electroacupuncture at Baihui and Shenting for seven days. They were as-sessed with Longa's scores, and tested with Barnes maze. Their cerebral infarct volume was tested with magnetic resonance imaging T2-weighted image. The ultrastructure of synapse in hippocampal CA1 region was observed with transmission electron microscope. Results Compared with the model group, the Longa's score improved (P<0.05), the infarct volume decreased (P<0.01), the average escape latency decreased (P<0.01) and the times entering the wrong hole decreased (P<0.001) in the electroacupuncture group. Under the transmission elec-tron microscope, the number of synapse decreased in the model group, with the structure damage and vesicles sparse;compared with the model group, the number of synapse increased in the electroacupuncture group, with clear and complete structure and rich vesicles. Conclu-sion Electroacupuncture at Baihui and Shenting can improve the learning-memory function in rats after cerebral ischmeia-reperfusion, which may relate to improvement of synaptic plasticity and ameliorating ultrastructure in hippocampal CA1 region.%目的 观察电针百会、神庭穴对脑缺血再灌注大鼠学习记忆能力及损伤大鼠海马CA1区突触超微结构的影响.方法 雄性Sprague-Dawley大鼠25只随机分为假手术组(n=6)和手术组(n=19).手术组线栓法建立左侧大脑中动脉栓塞90 min后再灌注模型,筛选符合纳入标准的12只大鼠随机分为模型组和电针组各6只.电针组电针百会、神庭穴7 d.采用Longa评分检测大鼠神经功能;小动物磁共振成像分析系统T2加权成像观察脑梗死体积;Barnes迷宫测试检测大鼠学习记忆能力;透射电镜观察海马CA1区突触超微结构.结果 与模型组相比,电针组Longa评分降低(P<0.05),脑梗死体积明显减少(P<0.01);Barnes迷宫测试逃避潜伏期明显缩短(P<0.01),平均进入错误洞口次数显著减少(P<0.001).透射电镜显示,模型组突触结构溶解,数量减少,囊泡稀疏、破坏;与模型组相比,电针组突触结构较清晰,突触数量较多,突触囊泡较多.结论 电针百会、神庭能有效改善脑缺血再灌注大鼠的学习记忆能力,其机制可能与改善海马CA1区突触的超微结构,提高突触可塑性有关.