银杏叶提取物对MPTP诱导帕金森小鼠保护作用的研究

目的观察银杏叶提取物(ginkgo biloba extract,GBE)对1-甲基-4-苯基-1,2,3,6-四氢吡啶(MPTP)诱导不同年龄段的帕金森(parkinson’s disease,PD)小鼠的防治作用。方法将8周龄及32周龄各60只C57BL/6小鼠随机分为阴性组,模型组,GBE给药高、中、低剂量组及阳性组,采用腹腔注射MPTP法制备PD动物模型,采用银杏叶提取物进行灌胃治疗。运用爬杆、悬挂和游泳实验检测小鼠肢体运动功能,采用分光光度法测定小鼠脑组织超氧化物歧化酶(SOD)、谷胱甘肽过氧化物酶(GSH-Px)活性及丙二醛(MDA)含量,采用免疫组化法观察小鼠大脑黑质酪氨酸羟化酶(TH)及纹状体多巴胺转运蛋白(DAT)阳性细胞数目的变化。结果 (1)与阴性对照组比较,8周龄模型组小鼠运动功能得分、大脑GSH-Px活性、黑质TH阳性细胞及纹状体DAT阳性细胞平均光密度值均显著下降,脑组织MDA含量显著升高,说明PD模型复制成功。与模型组比较,银杏叶提取物给药组8周龄小鼠运动功能得分、SOD与GSH-Px活性、黑质TH阳性细胞平均光密度值均显著提高,MDA含量显著下降。(2)与阴性对照组比较,32周龄模型组小鼠运动功能得分、黑质TH阳性细胞以及纹状体DAT阳性细胞平均光密度值均显著下降,SOD与GSH-Px活性降低,脑组织MDA含量升高,说明模型复制成功。与模型组比较,银杏叶提取物给药组32周龄小鼠运动功能得分、SOD活性、黑质TH及纹状体DAT阳性细胞平均光密度值均显著提高,脑组织MDA含量显著下降。结论银杏叶提取物对MPTP诱导的不同年龄段PD小鼠有一定的防治作用。

Protective effect of ginkgo biloba extract on mouse with parkinson's disease induced by MPTP

Objective To investigate the therapeutical effect of Ginkgo Biloba extract (GBE) on different ages of parkinsono Biloba e (PD) mice that induced by MPTP. Methods Sixty adult mice (8 weeks) and sixty older mice (32 weeks) were randomly divided into 6 groups: negative group, model group, positive group, high, medium and low dose GBE group. PD animal model were built through injecting with MPTP and then treated with different drugs accordingly. The limb motor function of mice were tested by using pole-climbing, hanging and swimming test. The activities of superoxide dismutase (SOD), glutathione peroxidase (GSH-Px) and the content of malondial dehyde (MDA) in the brain tissue were measure using spectro photography. The number of positive neurons expressing tyrosine hydroxylase (TH) in substantial nigra pars compacta and dopamine transporters (DAT) in striatum were detected by using the method of immunohistochemistry. Results 1. The motor function score, the activity of GSH-Px, and the mean optical density of TH and DAT in brain tissues of model group of 8 weeks significantly decreased compared with negative group, while the content of MDA was significantly raised, showing the model of PD was successfully established. The function score, the activities of SOD and GSH-Px, the mean optical density of TH and DAT in brain tissues of the GBE treatment group significantly raised compared with the model group, while the content of MDA was significantly decreased. 2. The motor function score, the activity of GSH-Px, and the mean optical density of TH and DAT in brain tissues of model group of 32 weeks significantly decreased compared with negative group, while the content of MDA was significantly raised, showing the model of PD was successfully established. The function score, the activities of SOD and GSH-Px, the mean optical density of TH and DAT in brain tissues of the GBE treatment group significantly raised compared with the model group, while the content of MDA was significantly decreased. Conclusions The preventive medication of GBE shows a protective effect on mice of different ages with PD induced by MPTP.