【摘要】 背景:针灸对脊髓损伤后期神经功能的恢复具有明显的促进作用已得到客观证实,本课题组以往的实验已证实电针可抑制脊髓损伤早期细胞凋亡,但电针抑制细胞凋亡的机制尚不清楚。目的:通过原位杂交及免疫组织化学方法观察电针对凋亡抑制基因Bcl-2mRNA及蛋白表达的影响,探讨电针干预脊髓损伤早期细胞调亡可能的机制。设计:开放性动物实验。单位:解放军第二军医大学解剖学教研室,上海市针灸经络研究中心。材料:成年雄性SD大鼠,清洁级,鼠龄两三个月。Bcl-2原位杂交检测试剂盒(武汉博士德生物科技有限公司);Bcl-2抗体(1∶200,SantaCruzBiotechnology公司)。方法:实验于2004-07/2005-12在解放军第二军医大学解剖学教研室完成。实验大鼠随机分为模型组、电针治疗组、甲基强的松龙组及假手术组。采用改良的Allen’s垂击法致大鼠T10脊髓损伤,损伤后即刻进行督脉电针治疗,应用原位杂交和免疫组织化学方法结合图象定量分析法进行评估。主要观察指标:①脊髓损伤早期Bcl-2mRNA和蛋白的表达。②电针对Bcl-2mRNA和蛋白表达的影响结果:实验过程中如遇动物死亡,及时补充,最终42只大鼠进入结果分析。①假手术组有中等量的Bcl-2mRNA及蛋白表达。模型组在脊髓损伤后6hBcl-2mRNA表达有增高趋势,Bcl-2蛋白表达未见明显变化;伤后24hBcl-2mRNA表达增高,Bcl-2蛋白表达也相应增高。电针组Bcl-2mRNA及蛋白表达均高于模型组(P<0.05),与甲基强的松龙组相比无显著性差异。②电针及甲基强的松龙治疗6h组,Bcl-2mRNA阳性细胞数增加,灰度值降低,与假手术组和模型组相比差异有显著性和非常显著性意义(P<0.05～0.01)。电针24h治疗组,Bcl-2mRNA阳性细胞数显著增高,灰度值降低,与假手术组及模型组相比差异均具有显著性和非常显著性意义(P<0.05～0.01)。③电针24h治疗组,Bcl-2免疫阳性细胞明显增加,灰度值降低,与假手术组和模型组相比,差异具有显著性和非常显著性意义(P<0.05～0.01)。结论:电针可上调Bcl-2mRNA及蛋白的表达,进而对脊髓损伤早期细胞调亡具有部分抑制作用。更多还原

【Abstract】 BACKGROUND: It is proved that acupuncture can remarkably promote recovery of nervous function after spinal cord injury (SCI). Previous studies in our groups have been proved that electro-acupuncture can inhibit apoptosis in early period of SCI, but the mechanism is unclear yet. OBJECTIVE: To study the effect of electro-acupuncture on expressions of apoptosis inhibitory gene Bcl-2 mRNA and protein with hybridization in situ and immunohistochemistry and discuss the possible mechanism of apoptosis inhibited by electro-acupuncture in early SCI. DESIGN:Opening animal study. SETTING: Department of Anatomy, the Second Military Medical University of Chinese PLA; Shanghai Acupuncture & Moxibustion and Meridian Research Center. MATERIALS:Adult male SD rats of pathogen-free aged 2-3 months were selected in this study. Bcl-2 hybridization in situ kit was provided by Wuhan Boshide Biotechnology Company Limited and Bcl-2 antibody (1:200) was provided by Santa Cruz Biotechnology Company. METHODS: The experiment was completed at the Laboratory of Anatomy of the Second Military Medical University of Chinese PLA from July 2004 to December 2005. All experimental rats were randomly divided into model group, electro-acupuncture group, methylprednisolone group and sham operation group. T10 spinal cord was injuried by the modified Allen’s method and treated with electro-acupuncture immediately, and then the expressions of Bcl-2 mRNA and protein were evaluated with hybridization in situ and immunohistochemistry combined with image quantitative analysis. MAIN OUTCOME MEASURES: (1) Expressions of Bcl-2 mRNA and protein in early SCI; (2) effect of electro-acupuncture on expressions of Bcl-2 mRNA and protein. RESULTS: The rats were supplied when they died during the experiment, and all 42 rats were involved in the final analysis. (1) Moderate expression of Bcl-2 mRNA and protein was observed in the sham operation group. Expression of Bcl-2 mRNA was increased in model group at 6 hours after SCI, but expression of Bcl-2 protein was not changed. At 24 hours after SCI, both expressions of Bcl-2 mRNA and Bcl-2 protein were increased. Expression of Bcl-2 mRNA and protein was higher in electro-acupuncture group than that in model group (P < 0.05), and there was no significant difference from that in methylprednisolone group. (2) Amount of positive Bcl-2 mRNA cells was increased in electro-acupuncture group and methylprednisolone group at 6 hours after treatment, and gray value was decreased.There was significant and remarkably significant difference from those in sham operation group and model group, respectively (P < 0.05-0.01). After 24-hour treatment, amount of positive Bcl-2 mRNA cells was increased in electro-acupuncture group and gray value was decreased. There was significant and remarkably significant difference from those in sham operation group and model group, respectively (P < 0.05-0.01). (3) After 24-hour treatment, amount of immunohistochemistry positive Bcl-2 cells was increased in electro-acupuncture group and gray value was decreased. There was significant and remarkably significant difference from those in sham operation group and model group, respectively (P < 0.05-0.01). CONCLUSION: Electro-acupuncture can up-regulate the expressions of Bcl-2 mRNA and protein so as to inhibit apoptosis in early SCI.更多还原