Video_6_Inhibition of M/Kv7 Currents Contributes to Chloroquine-Induced Itch in Mice.mp4 (17.26 MB)
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Video_6_Inhibition of M/Kv7 Currents Contributes to Chloroquine-Induced Itch in Mice.mp4

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posted on 30.06.2020, 14:03 by Dong Zhang, Hongchao Men, Ludi Zhang, Xiangxin Gao, Jingjing Wang, Leying Li, Qiaoying Zhu, Hailin Zhang, Zhanfeng Jia

M/Kv7 potassium channels play a key role in regulation of neuronal excitability. Modulation of neuronal excitability of primary sensory neurons determines the itch sensation induced by a variety of itch-causing substances including chloroquine (CQ). In the present study, we demonstrate that suppression of M/Kv7 channel activity contributes to generation of itch in mice. CQ enhances excitability of the primary sensory neurons through inhibiting M/Kv7 potassium currents in a Ca2+ influx-dependent manner. Specific M/Kv7 channel opener retigabine (RTG) or tannic acid (TA) not only reverses the CQ-induced enhancement of neuronal excitability but also suppresses the CQ-induced itch behavior. Systemic application of RTG or TA also significantly inhibits the itch behavior induced by a variety of pruritogens. Taken together, our findings provide novel insight into the molecular basis of CQ-induced itch sensation in mammals that can be applied to the development of strategies to mitigate itch behavior.

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