Objective To investigate the effect of electroacupuncture on the expressions of endoplasmic reticulum stress-related proteins in the substantia nigra in a rat model of rotenone-induced Parkinson disease.Methods One hundred and twenty healthy male SD rats were randomized to normal, sham operation, model, electroacupuncture pretreatment, and 7-day, 14-day, 21-day and 28-day electroacupuncture treatment groups, 15 rats each. A model of Parkinson disease was made by subcutaneous injection of rotenone in the nape. The sham operation group received an injection of equal volume of sunflower oil emulsion. The normal, sham operation and model groups were not treated. The electroacupuncture treatment group received electroacupuncture at points Fengfu (GV 16)and Taichong (LR 3) after model making. The electroacupuncture pretreatment group received model making after 7 days of electroacupuncture treatment. TH and α-syn positive cells expressions in rat substantia nigra were determined by immunohistochemical method. BiP and CHOP expressions in rat substantia nigra were examined by Western blotting. Results The model group rats had obvious syndrome characteristic of PD and rat behavior score decreased significantly after electroacupuncture intervention (P<0.01).α-syn positive cells expression and BiP and CHOP expressions in rat substantia nigra increased significantly and TH positive cells expression in rat substantia nigra decreased significantly in the model group compare with the normal and sham operation groups (P<0.01).α-syn positive cells expression and BiP and CHOP expressions in rat substantia nigra decreased significantly and TH positive cells expression in rat substantia nigra increased significantly in every electroacupuncture treatment group compare with the model group (P<0.01).Conclusions The mechanism of electroacupuncture prevention and treatment of Parkinson disease may be related to its significant inhibition of the expressions of endoplasmic reticulum stress-related proteins and protection of dopaminergic neurons.%目的 观察电针对鱼藤酮诱导的帕金森病(PD)模型大鼠黑质内质网应激相关蛋白表达的影响.方法 将120只健康雄性SD大鼠随机分正常组、假手术组、模型组、电针预治疗组、电针治疗7 d组、电针治疗14 d组、电针治疗21 d组、电针治疗28 d组,每组15只,采用颈背部皮下注射鱼藤酮法制备PD模型,假手术组只注射不含鱼藤酮的等量葵花油乳化液.正常组、假手术组、模型组不做任何治疗;电针治疗组在造模完成后选取风府、太冲穴给予电针治疗;电针预治疗组电针治疗7 d后再造模.运用免疫组化法检测大鼠黑质内TH、α-syn的阳性表达,并用Western blot法检测大鼠中脑黑质区内Bip、CHOP蛋白表达的变化.结果 模型组大鼠表现出明显的PD症候群特征,电针干预后大鼠行为学评分明显降低(P<0.01);与正常组和假手术组相比,模型组大鼠黑质区α-syn的阳性表达与Bip、CHOP蛋白的表达均显著提高,大鼠黑质区TH的阳性表达均显著降低(P<0.01);与模型组相比,电针治疗各组大鼠黑质区α-syn的阳性表达以及Bip、CHOP蛋白的表达均显著降低(P<0.01),大鼠黑质区TH的阳性表达显著提高(P<0.01).结论 电针防治PD的机制可能与电针能明显抑制内质网应激相关蛋白的表达,保护多巴胺能神经元有关.
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