缝隙连接蛋白pannexin1在神经病理性疼痛大鼠脊髓背角的表达变化

目的 观察缝隙连接蛋白pannexin1(PX1)在坐骨神经分支选择结扎模型大鼠脊髓背角上的表达变化.方法 健康SD雄性大鼠50只 ,分为对照组(WT组 ,n=10)、假手术组(sham组 ,n=10)和坐骨神经分支选择性损伤组(SNI组 ,n=30).SNI组20只大鼠于术后3、5、7、14 d(n=5) ,WT、sham组于术后14 d(n=5)取脊髓腰段用Western blot法检测PX1表达变化 ,另20只大鼠于术后7 d取脊髓腰段进行免疫组化染色 ,检测脊髓背角内胶质纤维酸性蛋白(GFAP)的表达水平.SNI组中10只于建模前进行鞘内置管 ,术后7 d分别向鞘内注射生理盐水20 μL(SNI+NS组)或甘珀酸(CBX)20 μL(SNI+CBX组) ,再进行免疫组化染色.结果 SNI组脊髓背角内PX1表达增多 ,并随时间增强 ,明显高于WT、sham组(P＜0 .05);7 d后SNI组脊髓背角内GFAP表达较WT、sham组明显增强(P＜0 .05);SNI+CBX组GFAP表达较SNI+ NS组明显下调(P＜0 .05).WT、sham组脊髓背角的PX1蛋白和GFAP表达差异无统计学意义(P＞0 .05).结论 缝隙连接蛋白PX1可能参与了星形胶质细胞的激活 ,提示其在因外周神经损伤引起的神经病理性痛中起重要作用.

Change of pannexin1 expression in dorsal horn of spinal cord in rats with neuropathic pain

Objective To observe the expression of pannexin1(PX1) in the dorsal horn of spinal cord in model ratwith neu-ropathipain afteselective ligation of sciatinerve branche.Method50 male SD ratwere randomly divided into 3 group,inclu-ding the control group(Wgroup ,n= 10) ,sham operation group(sham group ,n= 10) and sciatinerve branch selective injury group(SNI group ,n=30) .30 ratwere killed on postoperative 3 ,5 ,7 ,14 d and the lumbasegmenof the spinal cord wataken fodetecting the expression of PX1 by using Western blo.Othe20 ratwere killed on 7 d afteSNI and the expression of glial fibril-lary acidiprotein(GFAP) in the spinal cord wadetected with immunohistology .Among them ,10 ratin the SNI group were trea-ted with intrathecal intubation before operation and administrated with saline 20 μL ocarbenoxolone(CBX) 20 μL by intrathecal injection on postoperative 7 d fodetermining the expression of GFAP by the immunohistology .ResultThe expression of PX1 in the SNI group waincreased and enhanced with time ,which wasignificantly highethan thain the Wgroup and the sham group (P＜0 .05);the GFAP expression on 7 d in the SNI group waobviously increased compared with the Wgroup and the sham group(P＜0 .05);afteintrathecal injection of CBX ,the expression of GFAP wasignificantly decreased compared with thain the normal saline group(P＜0 .05) .No statistically significandifferencein the expression of PX1 and GFAP were found in the Wgroup and the sham group .Conclusion PX1 may be involved in the activation of astrocyte,prompting thaPX1 playan importanrole in the neuropathipain caused by the peripheral nervel injury .