KCNQ Channels in the Mesolimbic Reward Circuit Regulate Nociception in Chronic Pain in Mice.

KCNQ Channels in the Mesolimbic Reward Circuit Regulate Nociception in Chronic Pain in Mice.
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中脑边缘奖赏回路中的 KCNQ 通道调节小鼠慢性疼痛的伤害感受

DOI:
10.1007/s12264-021-00668-x
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发表时间:
2021-05
影响因子:
5.6
通讯作者:
Cao JL
Cao JL
中科院分区:
医学2区
文献类型:
--
作者:
Wang HR;Hu SW;Zhang S;Song Y;Wang XY;Wang L;Li YY;Yu YM;Liu H;Liu D;Ding HL;Cao JL

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中皮质边缘多巴胺能(DA)神经元参与调节慢性疼痛的伤害感受,但其机制尚不清楚。本研究发现,慢性建构性损伤(CCI)增加了小鼠腹侧被盖区(VTA) DA神经元向伏隔核(NAc)投射的放电活性,并降低了KCNQ通道介导的m电流。VTA-to-NAc DA神经元的化学发生抑制可减轻cci诱导的热痛觉。在投射到内侧前额叶皮层(mPFC)的VTA DA神经元中记录到相反的放电活动和m电流变化,但不影响伤害感觉。此外,在vta内注射雷加滨(一种KCNQ开启剂),在逆转vta -NAc DA神经元变化的同时,减轻了cci诱导的伤害感受,而在NAc内注射外源性BDNF可以消除这种伤害感受。综上所述,这些发现强调了KCNQ通道介导的中脑边缘DA活性调节在调节慢性疼痛状态的热伤害感觉中的重要作用。
Mesocorticolimbic dopaminergic (DA) neurons have been implicated in regulating nociception in chronic pain, yet the mechanisms are barely understood. Here, we found that chronic constructive injury (CCI) in mice increased the firing activity and decreased the KCNQ channel-mediated M-currents in ventral tegmental area (VTA) DA neurons projecting to the nucleus accumbens (NAc). Chemogenetic inhibition of the VTA-to-NAc DA neurons alleviated CCI-induced thermal nociception. Opposite changes in the firing activity and M-currents were recorded in VTA DA neurons projecting to the medial prefrontal cortex (mPFC) but did not affect nociception. In addition, intra-VTA injection of retigabine, a KCNQ opener, while reversing the changes of the VTA-to-NAc DA neurons, alleviated CCI-induced nociception, and this was abolished by injecting exogenous BDNF into the NAc. Taken together, these findings highlight a vital role of KCNQ channel-mediated modulation of mesolimbic DA activity in regulating thermal nociception in the chronic pain state.
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