唑尼沙胺对癫痫大鼠血清及脑组织 NO 含量及 NOS 活性的影响

摘要： 目的 探讨新型抗癫痫药物唑尼沙胺对癫痫大鼠血清及脑组织 NO 含量及一氧化氮合酶 （NOS） 活性的影响。方法 50 只健康雄性 SD 大鼠中随机抽取 8 只为正常对照组， 剩余 42 只全部腹腔注射戊四氮制成癫痫模型， 从中随机抽取 24 只， 以完全随机分组法分为癫痫模型组、 唑尼沙胺组及苯巴比妥组， 监测各组大鼠经药物干预后血清及脑组织 NO、 丙二醛（MDA）含量及 NOS、 超氧化物歧化酶（SOD）的活性变化。结果 35 只（83%）大鼠模型制备成功； 戊四氮致痫大鼠的脑电图中均可见阵发性癫痫波； 与正常对照组比较， 癫痫模型组和唑尼沙胺组大鼠的血清和脑组织的 NO、 MDA 含量及 NOS 活性明显升高， SOD 活性下降； 苯巴比妥组脑组织 NO、 MDA 含量升高， SOD 活性下降， 血清 MDA 含量升高。与癫痫模型组比较， 唑尼沙胺组和苯巴比妥组大鼠血清和脑组织 NO、 MDA 含量及 NOS 活性明显降低， SOD 活性升高， 差异有统计学意义 （P＜0.05）。结论 唑尼沙胺通过降低脑组织 NO 含量而发挥其抗癫痫作用。

Effects of zonisamide on NO content and NOS activity in serum and brain tissue of epileptic rats

Abstract: Objective To investigate the effect of zonisamide as a new antiepileptic drug on nitric oxide (NO) content and nitric oxide synthase (NOS) activity in serum and brain tissue of epileptic rats. Methods Eight healthy rats were used as normal control group, and twenty- four epileptic rats induced by pentrazol were randomly divided into epilepsy model group, zonisamide group and phenobarbital group. Levels of NO and malondialdehyde (MDA) content, NOS and superoxide dismutase (SOD) activity in serum and brain tissue were detected in four groups. Results Forty-two rats were injected pen⁃ trazol, and 35 (83%) rats were established the rat model successfully. Epileptic waves were visible in EEG of epileptic rats. The concentrations of NO, MDA and the activity of NOS in serum and brain were significantly increased, the activity of SOD was significantly decreased, in epileptic rats than those of control rats. The concentrations of NO and MDA were significantly increased; the activity of SOD was significantly decreased, in brain in phenobarbital group compared with those of control group. There were significantly lower levels of NO, MDA and NOS, and significantly higher level of SOD in serum and brain tissue in zonisamide group and phenobarbital group than those of epileptic model group (P＜0.05). Conclusion Zonisamide plays an antiepileptic role by reducing the concentration of NO in brain of epileptic rats.