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<p>Ion channels are essential for sensing somatic stimuli, and their dysregulation can cause chronic conditions such as neuropathic pain. Although the potassium channel Twik-1 has been linked to sensory processing, its specific roles in the somatosensory system under normal and disease conditions remain unclear. Here, we demonstrate that systemic deletion of Twik-1 selectively reduces innocuous tactile and noxious mechanosensation evoked by both static and dynamic mechanical stimuli and facilitates recovery from mechanical hypersensitivity after peripheral nerve injury. Conditional deletion of Twik-1 in spinal cord neurons, pan-inhibitory neurons, or spinal inhibitory interneurons consistently disrupts innocuous tactile and noxious mechanical sensitivity, while sparing responses to high-intensity mechanical stimulation as well as noxious heat and cold. Notably, these manipulations do not affect nerve injury-induced mechanical hypersensitivity. In contrast, selective deletion of Twik-1 in dorsal root ganglion (DRG) neurons preserves baseline somatosensory and nociceptive functions, including innocuous tactile and noxious mechanical sensitivity, but impairs the persistence of mechanical hypersensitivity after nerve injury. This reduction in hypersensitivity is accompanied by decreased aberrant excitability in injured DRG neurons and distinct transcriptional changes. Together, these results suggest that Twik-1 facilitates innocuous tactile and noxious mechanosensation through spinal inhibitory circuits under baseline conditions, while supporting the maintenance of neuropathic pain via its functions in primary sensory neurons.</p>

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TWIK-1 plays distinct roles in spinal and peripheral sensory circuits controlling mechanical sensitivity and neuropathic hypersensitivity

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2026年6月25日

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  • Seo Young Yang,
  • Tery Yun,
  • Yunjeong Lee,
  • Jae Hyuk Jeon,
  • Seojung Kim,
  • Eun Yeong Lim,
  • Junhee Park,
  • Yong Geon Kim,
  • Jonghoon Jung,
  • Jin-Nyeong Woo,
  • Yan Zhang,
  • Hyeonwi Son,
  • John Shannonhouse,
  • Juhyun Kim,
  • Eunsil Cho,
  • Young Hoon Sung,
  • Eun-Mi Hwang,
  • Byung-Chang Suh,
  • Pojeong Park,
  • Mi-Ryoung Song,
  • Myungin Baek,
  • Jaekwang Lee,
  • Yu Shin Kim,
  • Jae-Yong Park,
  • Hyosang Lee

摘要

Ion channels are essential for sensing somatic stimuli, and their dysregulation can cause chronic conditions such as neuropathic pain. Although the potassium channel Twik-1 has been linked to sensory processing, its specific roles in the somatosensory system under normal and disease conditions remain unclear. Here, we demonstrate that systemic deletion of Twik-1 selectively reduces innocuous tactile and noxious mechanosensation evoked by both static and dynamic mechanical stimuli and facilitates recovery from mechanical hypersensitivity after peripheral nerve injury. Conditional deletion of Twik-1 in spinal cord neurons, pan-inhibitory neurons, or spinal inhibitory interneurons consistently disrupts innocuous tactile and noxious mechanical sensitivity, while sparing responses to high-intensity mechanical stimulation as well as noxious heat and cold. Notably, these manipulations do not affect nerve injury-induced mechanical hypersensitivity. In contrast, selective deletion of Twik-1 in dorsal root ganglion (DRG) neurons preserves baseline somatosensory and nociceptive functions, including innocuous tactile and noxious mechanical sensitivity, but impairs the persistence of mechanical hypersensitivity after nerve injury. This reduction in hypersensitivity is accompanied by decreased aberrant excitability in injured DRG neurons and distinct transcriptional changes. Together, these results suggest that Twik-1 facilitates innocuous tactile and noxious mechanosensation through spinal inhibitory circuits under baseline conditions, while supporting the maintenance of neuropathic pain via its functions in primary sensory neurons.