坐骨神经旁注射右美托咪啶对福尔马林致痛小鼠痛行为及脊髓背角c-fos表达的影响  

The effect of sciatic nerve injection of dexmedetomidine on the nociceptive behavior and spinal c-fos expression in formalin mice

作　　者：武静茹[1] 党秀静[1] 宿世玉[1] 王杰[2] 

机构地区：[1]徐州医学院江苏省麻醉学重点实验室,江苏徐州221000 [2]徐州医学院药学院,江苏徐州221000

出　　处：《重庆医学》2013年第33期4053-4055,共3页Chongqing medicine

基　　金：徐州市科技计划资助项目(XM12B017)

摘　　要：目的：探讨坐骨神经旁注射右美托咪啶对福尔马林致痛小鼠痛行为学及脊髓c-fos表达的影响。方法雄性成年昆明小鼠32只，体质量20～25 g ，随机分为4组，每组8只。A组在小鼠右侧坐骨神经旁注射生理盐水；B组在小鼠右足底皮下注射5％福尔马林（10μL ），建立急性炎性痛模型；C组在小鼠致痛前15 min预先在右侧坐骨神经旁注射右美托咪啶0．1μg ；D组在小鼠右侧坐骨神经旁注射右美托咪啶0．1μg。观察各组小鼠Ⅰ、Ⅱ时相舔咬足时间，在2 h时间点处死小鼠，取腰L4～5段脊髓，行免疫荧光检测c-fos的表达。结果与A组比较，B组小鼠在Ⅰ、Ⅱ时相出现明显的舔咬足行为，疼痛评分明显增高，脊髓c-fos的表达明显增多（P＜0．05）；与B组比较，C组舔咬足时间明显缩短，疼痛评分明显降低、脊髓c-fos的表达明显减少（P＜0．05）；A、C、D组疼痛评分和脊髓c-fos的表达差异无统计学意义。结论坐骨神经旁注射右美托咪啶能够减轻小鼠足底注射福尔马林引起的急性炎性痛，并且降低脊髓c-fos的表达。Objective To investigate the effect of sciatic nerve injection of dexmedetomidine on the nociceptive behavior and spi-nal c-fos expression in formalin mice .Methods Adult male Kunming mice ,20-25 g ,were divided into 4 groups randomly ：mice in group A and D were given an injection of NS （10 μL） and 0 .1 μg dexmedetomidine in 10 μL adjacent to the right sciatic nerve , sepretely .Mice in group B received intacutaneous injection of 10μL formalin（5% ） in the right hindpaws .Mice in group C were giv-en an injection of 0 .1 μg dexmedetomidine in 10 μL adjacent to the right sciatic nerve 15 min before formalin injection in the right hindpaws .Paw licking/biting time was counted every 5 min for an hour after hindpaw injections ,calculated pain score .1 hour after behavior tests ,the L4-5 of spinal cord were harvested to immunofluorescence for c-fos expression in the dorsal corn of spinal cord . Results Mice in group A、C and D showed no obvious foot licking/biting behaviors and a low level of c-fos expression in the dorsal corn of spinal cord .Compared with group A ,mice in group B displayed obvious two phases foot licking/biting behaviors（P〈0 .05 , both in Phase Ⅰ and Phase Ⅱ） and a significant increasing expression of c-fos（P〈0 .05） .Compared with group B ,dexmedetomi-dine injected to the adjacent of right sciatic nerve decreased the pain score and spinal c-fos expression in goup C（P〈0 .05） .Conclu-sion Injection of dexmedetomidine to the right sciatic nerve alleviated intraplantar injected formalin-induced acute inflammatory pain ,and reduced the expression of spinal c-fos protein .

关 键 词：右美托咪啶 福尔马林致痛 脊髓 C-FOS 

分 类 号：R96[医药卫生—药理学]