目的:观察电针和经皮穴位电刺激(TEAS)对肌肉炎性痛模型大鼠的镇痛效应,探讨激活痛源局部穴位深、浅层次的不同传入神经纤维在针刺镇痛中的作用。方法:通过在SD大鼠右侧股二头肌注射完全弗氏佐剂建立肌肉炎性痛模型。实验分为3部分:(1)...目的:观察电针和经皮穴位电刺激(TEAS)对肌肉炎性痛模型大鼠的镇痛效应,探讨激活痛源局部穴位深、浅层次的不同传入神经纤维在针刺镇痛中的作用。方法:通过在SD大鼠右侧股二头肌注射完全弗氏佐剂建立肌肉炎性痛模型。实验分为3部分:(1)8只模型大鼠分别采用不同刺激方式(电针/TEAS)诱导得出激活A类神经纤维的阈值(threshold of A fiber, Ta)和C类神经纤维的阈值(threshold of C fiber, Tc)。(2)48只大鼠随机分为正常组、模型组、Ta强度TEAS(TEAS-Ta)组、Tc强度TEAS(TEAS-Tc)组、Ta强度电针(EA-Ta)组、Tc强度电针(EA-Tc)组。4个干预组以相应的刺激强度干预痛源局部穴位"梁丘",以大鼠双足承重差值作为疼痛检测指标,观察不同强度的电针和TEAS的镇痛作用。(3)64只大鼠随机分为正常组、模型组、同侧梁丘TEAS组、同侧梁丘电针组、对侧梁丘TEAS组、对侧梁丘电针组、同侧合谷TEAS和同侧合谷电针组,观察不同强度电针和TEAS干预同侧"梁丘"、对侧"梁丘"和远端"合谷"对大鼠C类神经纤维反射肌电的影响。结果:采用TEAS和电针两种方式诱导出的Aδ类和C类神经纤维反射肌电,其潜伏期、阈值和持续时间差异无统计学意义(P>0.05)。与正常组比较,模型组大鼠双足承重差值明显升高(P<0.01);与模型组比较,干预同侧"梁丘"后,TEAS-Tc组、EA-Ta组、EA-Tc组双足承重差值降低(P<0.05,P<0.01);与TEAS-Ta组比较,TEAS-Tc组双足承重差值降低(P<0.05)。与本组干预前比较,Tc强度TEAS干预同侧"梁丘"即刻、1 min和对侧"梁丘"即刻,C纤维反射肌电的频率降低(P<0.01,P<0.05);以Tc强度电针同侧"梁丘"即刻、1 min、2 min和对侧"梁丘"即刻、1 min以及"合谷"即刻,C类纤维反射肌电频率均降低(P<0.01,P<0.05)。与模型组比较,以Tc强度TEAS干预同侧"梁丘"即刻、1 min、 2 min及Tc强度TEAS干预对侧"梁丘"即刻时,C类神经纤维反射肌电的频率均降低(P<0.01,P<0.0展开更多
Previous studies have demonstrated the effects of different afferent fibers on electroacupuncture （EA）- induced analgesia. However, contributions of functional receptors expressed on afferent fibers to the EA analge...Previous studies have demonstrated the effects of different afferent fibers on electroacupuncture （EA）- induced analgesia. However, contributions of functional receptors expressed on afferent fibers to the EA analgesia remain unclear. This study investigates the roles of acid-sensing ion channel 3 （ASIC3） and transient receptor potential vanifioid 1 （TRPV1） receptors in EA-induced segmental and systemic analgesia. Effects of EA at acupoint ST36 with different intensities on the C-fiber reflex and mechanical and thermal pain thresholds were measured among the ASIC3-/-, TRPV1-/-, and C57BL/6 mice. Compared with C57BL/6 mice, the ipsilateral inhibition of EA with 0.8 C-fiber threshold （0.8Tc） intensity on C-fiber reflex was markedly reduced in ASIC3-/- mice, whereas the bilateral inhibition of 1.0 and 2.0Tc EA was significantly decreased in TRPV1-/- mice. The segmental increase in pain thresholds induced by 0.3 mA EA was significantly reduced in ASIC3-/- mice, whereas the systemic enhancement of 1.0 mA EA was markedly decreased in TRPV1-/- mice. Thus, segmental analgesia of EA with lower intensity is partially mediated by ASIC3 receptor on Aβ-fiber, whereas systemic analgesia induced by EA with higher intensity is more likely induced by TRPV1 receptor on Aδ- and C-fibers.展开更多
文摘目的:观察电针和经皮穴位电刺激(TEAS)对肌肉炎性痛模型大鼠的镇痛效应,探讨激活痛源局部穴位深、浅层次的不同传入神经纤维在针刺镇痛中的作用。方法:通过在SD大鼠右侧股二头肌注射完全弗氏佐剂建立肌肉炎性痛模型。实验分为3部分:(1)8只模型大鼠分别采用不同刺激方式(电针/TEAS)诱导得出激活A类神经纤维的阈值(threshold of A fiber, Ta)和C类神经纤维的阈值(threshold of C fiber, Tc)。(2)48只大鼠随机分为正常组、模型组、Ta强度TEAS(TEAS-Ta)组、Tc强度TEAS(TEAS-Tc)组、Ta强度电针(EA-Ta)组、Tc强度电针(EA-Tc)组。4个干预组以相应的刺激强度干预痛源局部穴位"梁丘",以大鼠双足承重差值作为疼痛检测指标,观察不同强度的电针和TEAS的镇痛作用。(3)64只大鼠随机分为正常组、模型组、同侧梁丘TEAS组、同侧梁丘电针组、对侧梁丘TEAS组、对侧梁丘电针组、同侧合谷TEAS和同侧合谷电针组,观察不同强度电针和TEAS干预同侧"梁丘"、对侧"梁丘"和远端"合谷"对大鼠C类神经纤维反射肌电的影响。结果:采用TEAS和电针两种方式诱导出的Aδ类和C类神经纤维反射肌电,其潜伏期、阈值和持续时间差异无统计学意义(P>0.05)。与正常组比较,模型组大鼠双足承重差值明显升高(P<0.01);与模型组比较,干预同侧"梁丘"后,TEAS-Tc组、EA-Ta组、EA-Tc组双足承重差值降低(P<0.05,P<0.01);与TEAS-Ta组比较,TEAS-Tc组双足承重差值降低(P<0.05)。与本组干预前比较,Tc强度TEAS干预同侧"梁丘"即刻、1 min和对侧"梁丘"即刻,C纤维反射肌电的频率降低(P<0.01,P<0.05);以Tc强度电针同侧"梁丘"即刻、1 min、2 min和对侧"梁丘"即刻、1 min以及"合谷"即刻,C类纤维反射肌电频率均降低(P<0.01,P<0.05)。与模型组比较,以Tc强度TEAS干预同侧"梁丘"即刻、1 min、 2 min及Tc强度TEAS干预对侧"梁丘"即刻时,C类神经纤维反射肌电的频率均降低(P<0.01,P<0.0
基金This work was supported by National Natural Science Foundation of China （Nos. 81330087 and 81503668） and Beijing Natural Science Foundation （No. 7132148）.
文摘Previous studies have demonstrated the effects of different afferent fibers on electroacupuncture （EA）- induced analgesia. However, contributions of functional receptors expressed on afferent fibers to the EA analgesia remain unclear. This study investigates the roles of acid-sensing ion channel 3 （ASIC3） and transient receptor potential vanifioid 1 （TRPV1） receptors in EA-induced segmental and systemic analgesia. Effects of EA at acupoint ST36 with different intensities on the C-fiber reflex and mechanical and thermal pain thresholds were measured among the ASIC3-/-, TRPV1-/-, and C57BL/6 mice. Compared with C57BL/6 mice, the ipsilateral inhibition of EA with 0.8 C-fiber threshold （0.8Tc） intensity on C-fiber reflex was markedly reduced in ASIC3-/- mice, whereas the bilateral inhibition of 1.0 and 2.0Tc EA was significantly decreased in TRPV1-/- mice. The segmental increase in pain thresholds induced by 0.3 mA EA was significantly reduced in ASIC3-/- mice, whereas the systemic enhancement of 1.0 mA EA was markedly decreased in TRPV1-/- mice. Thus, segmental analgesia of EA with lower intensity is partially mediated by ASIC3 receptor on Aβ-fiber, whereas systemic analgesia induced by EA with higher intensity is more likely induced by TRPV1 receptor on Aδ- and C-fibers.
