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
酸敏感离子通道3(acid-sensing ion channels 3,ASIC3)是对p H值改变最敏感的酸受体。在对ASIC3及其基因敲除小鼠(ASIC3-/-小鼠)的研究中发现,ASIC3参与痛觉、酸味觉、感受伤害性刺激、心肌缺血等多种生理和病理过程,并发挥重要作用。...酸敏感离子通道3(acid-sensing ion channels 3,ASIC3)是对p H值改变最敏感的酸受体。在对ASIC3及其基因敲除小鼠(ASIC3-/-小鼠)的研究中发现,ASIC3参与痛觉、酸味觉、感受伤害性刺激、心肌缺血等多种生理和病理过程,并发挥重要作用。这些成果为在分子水平研究针刺治疗疾病的机制提供条件和基础。展开更多
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.
文摘酸敏感离子通道3(acid-sensing ion channels 3,ASIC3)是对p H值改变最敏感的酸受体。在对ASIC3及其基因敲除小鼠(ASIC3-/-小鼠)的研究中发现,ASIC3参与痛觉、酸味觉、感受伤害性刺激、心肌缺血等多种生理和病理过程,并发挥重要作用。这些成果为在分子水平研究针刺治疗疾病的机制提供条件和基础。
