川芎嗪对痫性大鼠脑内神经细胞结构的影响

背景川芎嗪可抑制脑海马神经元的放电活动,在体内吸收后能有效地透过血脑屏障,并广泛分布于大脑皮质、脑干、纹状体、海马、小脑和中脑等部位.目的探讨川芎嗪及其不同药物浓度经腹腔注射对青霉素致痫大鼠大脑皮质神经细胞结构的影响.设计随机对照实验.单位咸宁学院医学院生理学教研室.材料实验于2004-09/2005-03在华中科技大学同济医学院解剖学教研室完成.选择健康清洁级SD大鼠40只,雌雄不拘,体质量200～250 g.随机分为5组,即手术对照组、青霉素致痫组和川芎嗪10mg/kg,200mg/kg,40mg/kg组,每组8只.方法大鼠麻醉开颅,暴露大脑皮质记录区域,采用BL-410生物功能实验系统记录左右两侧脑电,应用青霉素诱发青霉素致痫组和川芎嗪10 mg/kg,20mg/kg,40 mg/kg组大鼠大脑皮质癫痫样放电.手术对照组在麻醉开颅手术1 h后取大脑;青霉素致痫组在青霉素诱发癫痫1 h后取大脑;川芎嗪10 mg/kg,20mg/kg,40 mg/kg组在青霉素诱发癫痫放电稳定后,再分别腹腔注射川芎嗪10 mg/kg,20 mg/kg,40mg/kg,待抑制作用最明显时取大脑.分别制备脑组织切片,苏木精-伊红染色,光学显微镜下观察.主要观察指标各组大鼠大脑皮质神经细胞的结构变化.结果40只大鼠全部进入结果分析,无脱失.①手术对照组大鼠大脑皮质神经细胞的形态结构正常.②青霉素致痫组大鼠大脑皮质神经细胞结构出现明显的改变,核固缩,胞浆溶解,出现空泡状结构,胞质内未见尼氏体.③川芎嗪10 mg/kg组大鼠与手术对照组比较,核固缩,胞浆溶解,出现空泡状结构,胞质内尼氏体减少.④川芎嗪20mg/kg组大鼠与手术对照组比较,神经细胞内空泡减少,胞浆增多,胞浆内可见少量尼氏体.细胞结构形态有所改善.⑤川芎嗪40 mg/kg组大鼠与手术对照组比较,细胞核大而圆染色浅,胞质内可见块状的尼氏体,细胞结构形态趋于正常.结论青霉素致痫后大鼠大脑皮质神经细胞的形态结构异常,不同剂量的川芎嗪可以不同程度地改善大脑皮质神经细胞的形态结构,而高剂量川芎嗪的改善作用尤其显著,其抑制大鼠癫痫样放电活动可能通过这一途径实现.

Influence of ligustrazine on neuronal structure in brain of epileptic rats

BACKGROUND: Ligustrazine inhibits discharge of cerebral hippocampal neuron, penetrates blood-brain barrier effectively after absorbed in the body and is distributed extensively in cerebral cortex, brain stem, striate body, hippocampus, cerebellum and midbrain.OBJECTIVE: To probe into the influence of ligustrazine and its different concentrations after abdominal injection on cerebral cortical neural cell structure in epileptic rats induced by penicillin.DESIGN: Randomized control experiment.SETTING: Physiological Department of Xianning Medical College.MATERIALS: The experiment was performed in Anatomy Department of Tongji Medical College of Huazhong University of Science and Technology from September 2004 to March 2005. Forty healthy SD rats of clean grade were employed, of either sex, mass weighted varied from 200 to 250 g.They were randomized into 5 groups, named operation control, penicillininduced epilepsy group and ligustrazine groups of 10 mg/kg, 20 mg/kg and 40 mg/kg, 8 rats in each group.METHODS: After anesthetized, the cranium was opened to expose cerebral cortical record region. BL-410 biofunctional experimental system was used to record brain electricity bilaterally and epileptic discharge of cerebral cortex in penicillin-induced epilepsy group and ligustrazine groups of 10 mg/kg,20 mg/kg and 40 mg/kg. In the control, 1 hour after anesthesia and craniotomy, cerebrum was collected. In penicillin-induced epilepsy group, 1 hour after induction, cerebrum was collected. In ligustrazine groups of 10 mg/kg,20 mg/kg and 40 mg/kg, after penicillin-induced epileptic discharge was stable, ligustrazine of 10 mg/kg, 20 mg/kg and 40 mg/kg was injected abdominally successively, and cerebrum was collected when the most remarkable inhibition was achieved. Brain tissue section was prepared separately, with HE staining, the observation was done under optic microscope.MAIN OUTCOME MEASURES: Structure changes in cerebral cortical neural cells in rats of each group.In the control, the morphological structure of cerebral cortical neural cell alternations on cerebral cortical neural cell structure, karyopykosis, plasmarrhexis and vacuolar structure, but there was no Nissel bodies in cytomarrhexis, vacuolar structure and decreased Nissel bodies in cytoplasm with the control, there were decreased vacuoles in neural cell, increased cytoplasm and few Nissel bodies in cytoplasm and cell structural morpholcontrol, karyon was big, round and light stained; clot-like Nissel bodies were visible and cell structural morphology was in tendency to be normal.CONCLUSION: In penicillin-induced epilepsy, morphological structure of cerebral cortical neural cell in rats is abnormal. Tetramethylpyrazine of various dosages may improve at different degrees morphological structure of cerebral cortical neural cell, especially significantly at high dosage, by which, its inhibition on epileptic discharge in rats is achieved.