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MONOARTHRITIS INDUCED ACTIVATION OF GLIAL CELLS IN CERVICAL,THORACIC, LUMBAR AND SACRAL SPINAL DORSAL HORN
Author(s): 
Pages: 270-275
Year: Issue:  5
Journal: Chinese Journal of Pain Medicine

Keyword:  MicrogliaAstrocytesMonoarthritisSpinal dorsal horn;
Abstract: 目的:探讨小胶质细胞和星形胶质细胞在单关节炎大鼠颈、胸、腰、骶段脊髓背角的活化.方法:16只SD雄性大鼠随机均分为正常对照组和单关节炎组(n=8).左侧踝关节腔注射完全弗氏佐剂(complete Freund' s adjuvant,CFA)建立单关节炎模型.分别采用Hargreaves’法和von Frey纤毛测定单关节炎大鼠双侧后爪致炎前及致炎后3d的热刺激缩爪反应潜伏期(paw withdrawal latency,PWL)、机械刺激抬腿反应阈值(paw withdrawal threshold,PWT).行为学测定结束后,每组取4只大鼠,灌注后取脊髓颈、胸、腰、骶段,采用免疫荧光组织化学法检测Iba-1(小胶质细胞标记物)和GFAP(星形胶质细胞标记物)在大鼠脊髓背角的表达情况.结果:单关节炎组大鼠致炎侧后爪的PWL和PWT值在致炎3d后均显著低于对照组(P<0.01),对侧后爪差异无显著性(P<0.05).单关节炎组大鼠致炎3d后,Iba-1和GFAP的荧光强度在颈、胸、腰段脊髓的双侧背角相较于对照组均明显增高,差异有显著性(P< 0.05或P<0.01),而在骶段无统计学差异(P<0.05),但有明显增加趋势.致炎侧和对侧脊髓背角Iba-1和GFAP的荧光强度在颈、胸、腰、骶各节段差异均无统计学意义(P<0.05).结论:单关节致炎导致大鼠患侧后爪出现触诱发痛和热痛觉过敏,并诱导小胶质细胞和星形胶质细胞在大鼠颈、胸、腰段双侧脊髓背角的活化.
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