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荜茇总生物碱对6-羟基多巴胺致帕金森病大鼠多巴胺能神经元损伤的保护作用研究

Keywords: 帕金森病,荜茇,生物碱,6-羟基多巴胺,抗氧化

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Abstract:

目的:探讨荜茇总生物碱(PLA)对6-羟基多巴胺(6-OHDA)致帕金森病(PD)大鼠多巴胺能神经元损伤的保护作用及其可能的机制。方法:采用脑立体定位单侧纹状体注射6-OHDA建立大鼠PD模型,将PD大鼠随机分为PLA组(PLA50mg·kg-1·d-1),美多巴组(美多巴50mg·kg-1·d-1)及模型组,每组15只,每日灌胃给药1次,连续6周。另随机选取15只大鼠在纹状体仅注射生理盐水作为假手术组。采用阿朴吗啡(APO)诱导的大鼠旋转及转棒实验进行行为学观察,酪氨酸羟化酶(TH)免疫组化检测大鼠黑质中TH阳性细胞数及纹状体中TH阳性纤维密度,用分光光度法检测大鼠黑质及纹状体内超氧化物歧化酶(SOD)、谷胱甘肽过氧化物酶(GSH-Px)、还原型谷胱甘肽(GSH)、过氧化氢酶(CAT)、丙二醛(MDA)、一氧化氮(NO)及一氧化氮合酶(NOS)的含量。结果:帕金森病大鼠在APO诱导后出现明显的旋转行为,且在转棒上的滞留时间缩短,黑质区TH阳性细胞数及纹状体TH阳性纤维密度明显减少,组织内SOD,GSH-Px,CAT的活力降低,NOS的活力升高,MDA,NO含量升高,GSH含量降低,总抗氧化能力明显降低。PLA能明显改善PD大鼠的行为学异常,增加黑质区TH阳性细胞数及纹状体TH阳性纤维密度,提高组织内SOD,GSH-Px,CAT的活力,降低NOS的活力,降低MDA和NO含量,提高GSH含量,总抗氧化能力明显提高。结论:荜茇总生物碱对6-OHDA致PD模型大鼠的黑质细胞具有保护作用,其机制可能与抗氧化活性有关。

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