PAR2和TMEM16A在神经病理性疼痛模型大鼠背根神经节上的表达及意义

摘要

目的 观察坐骨神经慢性压迫模型(CCI)的大鼠背根神经节(DRG)神经元上PAR2和TMEM16A的表达,探讨其在神经病理性疼痛中发挥的作用.方法 大鼠分为假手术组(Sham)和CCI组,两组分别检测热缩足反射潜伏期(TWL);采用免疫荧光和Western blot检测大鼠DRG神经元上PAR2和TMEM16A表达.结果 与Sham组比较,CCI组术前TWL差异无统计学意义,术后各时间点均明显降低且差异具有统计学意义(P＜ 0.01).免疫荧光结果显示:PAR2与TMEM16A在大鼠DRG神经元上共存.Western blot结果显示:与Sham组相比,CCI组术后7、14 d的PAR2和TMEM16A蛋白表达均出现明显增加(P＜0.01),且CCI组14d高于7d的PAR2和TMEM16A蛋白表达(P＜0.05).结论 神经病理性疼痛大鼠DRG神经元上PAR2和TMEM16A蛋白表达水平较Sham组显著升高,这些蛋白表达水平升高可能是导致大鼠神经病理性疼痛的原因之一.%Objective To observe the expression of PAR2 and TMEM16A in the model of chronic constriction injury (CCI) in rat dorsal root ganglion (DRG) neurons,and to explore the role of it in the neuropathic pain.Methods Rats were divided into Sham operation group (Sham) and CCI group.Both groups were observed respectively to determine thermal withdrawal latency (TWL).The expression of PAR2 and TMEM16A in the dorsal root ganglion of the rat was analyzed using Western blot and immunofluorescence.Results The difference in preoperative TWL between CCI group and Sham group rats was not statistically significant (P ＜ 0.01).TWL was signifi cantly lower at all other time points after operation (P ＜ 0.01).Immunofluorescence results showed that PAR2 and TMEM16A coexisted in rat DRG neurons.Western blot results showed that,compared with Sham group,CCI group PAR2 and TMEM16A protein expression significantly increased after 7 d and 14 d (P ＜ 0.01),and the PAR2 and TMEM16A protein expression on 14 d is higher than that of 7 d (P ＜ 0.05).Conclusions Expression level of PAR2 and TMEM16A in CCI group was significantly higher than those in Sham group.The expression level of these proteins may be the cause of rat model of neuropathic pain.