电针对自体髓核移植大鼠脊髓后角小胶质细胞活性的影响∗

摘要

目的：观察近部取穴、远部取穴、远近配穴电针对自体髓核移植大鼠模型痛行为及脊髓后角小胶质细胞标记物OX42和环氧化酶2( COX2)表达的影响,为理解不同针灸处方疗效差异提供依据。方法雄性SD大鼠54只,随机分为正常组、模型组、假手术组、远近配穴组、近穴组、远穴组,每组9只。建立自体髓核移植疼痛大鼠模型,远近配穴组取双侧“腰5夹脊穴”“大肠俞”“委中”和“昆仑”,近穴组取双侧“腰5夹脊穴”和“大肠俞”,远穴组取双侧“委中”和“昆仑”,每天1次,每次20 min,共治疗7 d。测定大鼠热刺激爪退缩阈值( TWL),用免疫组织化学法检测大鼠脊髓后角左侧OX42及COX2的表达变化。结果自体髓核移植大鼠TWL上升,脊髓后角OX42和COX2表达增加。与模型组相比,治疗组可以改善TWL ( P<0.05),抑制脊髓后角OX42表达,显著抑制脊髓后角COX2表达( P<0.05),远近配穴和近部取穴的抑制作用优于远部取穴。结论无论是近部取穴、远部取穴和远近配穴电针均能抑制脊髓后角炎性信号通路发挥抗炎效应,远近配穴和近部取穴的疗效优于远部取穴。%Objective To study the different prescriptions of eletcro-acupuncture ( distal-proximal acu-points, proximal acupoints and distal acupoints) on pain-related behaviors and expression of microglia marker OX42 and cyclooxygenase 2 ( COX2 ) in spinal dorsal horn in rat model of transplantation of autol-ogous nucleus pulposus, so as to provide experimental basis for the mechanism of the different prescrip-tions. Methods 54 healthy male SD rats were randomly divided into six groups ( each n=9 )-normal group, model group, sham operation group, distal-proximal acupoint group, proximal acupoint group, distal acupoint group. After modeling, the rats in three acupuncture groups were treated for 20 minutes, once daily for consecutive 7 days. Those in distal-proximal acupoint group were needled at bilateral “L5 Jiajixue” ( Ex-B2 ) ,“Dachangshu” ( BL 25 ) ,“Weizhong” ( BL 40 ) and“Kunlun” ( BL 60 );those in proximal acupoint group were needled at bilateral“L5 Jiajixue” ( Ex-B2 ) and“Dachangshu” ( BL 25 ) ;the rats in distal acupoint group rats were needled at bilateral “Weizhong” ( BL 40 ) and “Kunlun” ( BL 60). Thermal withdrawal latencies were evaluated. The expressions of OX42 and COX2 in the left spinal dorsal horn were detected using immunohistochemical methods. Results Thermal withdrawal latencies and the expression of OX42 and COX2 increased in rat model of transplantation of autologous nucleus pul-posus. After treatment, thermal pain threshold was improved (P<0. 05), and the expression of OX42 and COX2 were inhibited ( P<0 . 05 ) . The inhibitory effects of distal-proximal acupoint group and proxi-mal acupoint group were superior to that in distal acupoint group. Conclusion Each acupuncture pre-scription reduced anti-inflammatory effects by inhibiting inflammatory signaling pathways in spinal dorsal horn, with the prescription of distal-proximal acupoints and proximal acupoints superior to distal acu-points.