国际麻醉学与复苏杂志   2015, Issue (2): 1-1
    
炎性痛大鼠背根神经节中p38丝裂原活化蛋白激酶激活调节嘌呤2X3受体对痛觉过敏的影响
李紫薇, 刘功俭1()
1.江苏省麻醉学重点实验室和江苏省麻醉与镇痛应用技术重点实验室
p38 mitogen-activated protein kinase activation in dorsal root ganglion after inflammation regulates purine 2X3 receptors to affect hyperalgesia in rats
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摘要:

目的 研究完全弗氏佐剂(complete freund's adjuvant, CFA)导致的炎性痛大鼠的背根神经节(dorsal root ganglia, DRG)中,磷酸化p38丝裂原活化蛋白激酶(phospho-p38 mitogen-activated protein kinase, p-p38MAPK)与嘌呤2X3(purine 2X3, P2X3)受体的相互关系,及其对于痛觉过敏的影响。 方法 选择雄性SD大鼠72只,体重200 g~250 g。采用随机数字表法分为6组,每组12只:Sham+二甲基亚砜(dimethyl sulfoxide, DMSO)(Sham+DMSO)组、CFA+DMSO组、Sham+P2X3抑制剂A-317491(Sham+A)组、CFA+A-317491(CFA+A)组、Sham+p38丝裂原活化蛋白激酶(p38 mitogen-activated protein kinase, p38MAPK)抑制剂SB203580(Sham+SB)组和CFA+SB203580(CFA+SB)组,6组大鼠每组又分为两个亚组,每组6只,即行为学组和Western blot组。行为学组在造模前及造模后1、2、4 d检测热缩足潜伏期(thermal withdrawal latency, TWL),观察各组大鼠行为学变化。Western blot组在造模后2 d处死,取DRG检测p-p38MAPK及P2X3的表达。 结果 与造模前及Sham+DMSO组比较,CFA+DMSO组、CFA+A组、CFA+SB组大鼠TWL均明显降低[造模后2 d TWL分别为(16.3±1.1)、(5.0±0.7)、(12.6±1.5)、(10.7±1.6) s](P<0.05),而CFA+A组及CFA+SB组大鼠TWL均较CFA+DMSO组升高(P<0.05)。CFA致炎2 d后p-p38MAPK以及P2X3表达均显著增加(P<0.05);鞘内注射SB203580后,p-p38MAPK与P2X3的表达水平都有明显降低(P<0.05);鞘内注射A-317491后,P2X3的表达水平显著降低(P<0.05),而p-p38MAPK表达并未有明显变化(P>0.05)。 结论 炎性痛时p38MAPK的激活可介导P2X3受体的上调。

关键词: 炎性痛; 背根神经节; 嘌呤2X3; p38丝裂原活化蛋白激酶; 痛觉过敏
Abstract:

Objective The study was designed to investigate the relation of phospho-p38 mitogen-activated protein kinase(p-p38MAPK) and purine 2X3(P2X3) receptors in the dorsal root ganglion of inflammatory pain induced by complete freund's adjuvant (CFA) in rats. Methods Seventy-two male SD rats weighing 200 g-250 g were randomly divided into six groups(n=12):Sham+dimethyl sulfoxide(DMSO) group, CFA+DMSO group, Sham+P2X3 inhibitor A-317491(Sham+A) group, CFA+A-317491(CFA+A) group, Sham+p38 mitogen-activated protein kinase(p38MAPK) inhibitor SB203580(Sham+SB) group and CFA+SB203580(CFA+SB) group, and each of them was further divided into two subgroups respectively: the pain behavior groups(n=6) and the Western blot groups(n=6). Pain behavior was assessed by paw thermal withdrawal latency(TWL) at 1 d before and 1, 2, 4 d after CFA. Rats in the Western blot groups were sacrificed 2 d after CFA. Results Compared with their preoperative values and corresponding values in Sham+DMSO group, the TWL values in CFA+DMSO group, CFA+A group, CFA+SB significantly decreased [the TWL values of postoperative 2 d were(16.3±1.1), (5.0±0.7), (12.6±1.5), (10.7±1.6) s]. The TWL of CFA+A group and CFA+SB group were significantly increased than CFA+DMSO group's(P<0.05). Two days after CFA, the expression of p-p38MAPK and P2X3 were significantly increased(P<0.05). After application of SB203580, the expression of p-p38MAPK and P2X3 decreased significantly(P<0.05). After application of A-317491, the expression of P2X3 decreased significantly, while no significant difference was showed in the expression of p-p38MAPK(P>0.05). Conclusions P2X3 receptor is upregulated through activation of the p38MAPK pathway after inflammation.

Key words: Inflammatory pain; Dorsal root ganglia; Purine 2X3; P38 mitogen-activated protein kinase; Hyperalgesia