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首页> 外文期刊>Neuron >TMC-1 Mediates Alkaline Sensation in C. elegans through Nociceptive Neurons
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TMC-1 Mediates Alkaline Sensation in C. elegans through Nociceptive Neurons

机译:TMC-1通过伤害性神经元介导线虫中的碱性感觉。

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摘要

Noxious pH triggers pungent taste and nocifensive behavior. While the mechanisms underlying acidic pH sensation have been extensively characterized, little is known about how animals sense alkaline pH in the environment. TMC genes encode a family of evolutionarily conserved membrane proteins whose functions are largely unknown. Here, we characterize C. elegans TMC-1, which was suggested to form a Na+-sensitive channel mediating salt chemosensation. Interestingly, we find that TMC-1 is required for worms to avoid noxious alkaline environment. Alkaline pH evokes an inward current in nociceptive neurons, which is primarily mediated by TMC-1 and to a lesser extent by the TRP channel OSM-9. However, unlike OSM-9, which is sensitive to both acidic and alkaline pH, TMC-1 is only required for alkali-activated current, revealing a specificity for alkaline sensation. Ectopic expression of TMC-1 confers alkaline sensitivity to alkali-insensitive cells. Our results identify an unexpected role for TMCs in alkaline sensation and nociception.
机译:有害的pH值会触发刺激性味道和伤害行为。尽管已经广泛表征了酸性pH感觉的潜在机制,但人们对动物如何感知环境中的碱性pH知之甚少。 TMC基因编码一系列进化保守的膜蛋白,其功能很大程度上未知。在这里,我们表征线虫TMC-1,建议其形成介导盐化学传感的Na +敏感通道。有趣的是,我们发现蠕虫需要TMC-1来避免有害的碱性环境。碱性pH在伤害性神经元中引起内向电流,该电流主要由TMC-1介导,而在较小程度上由TRP通道OSM-9介导。但是,与OSM-9(它对酸性和碱性pH值都敏感)不同,TMC-1仅在碱活化电流中才需要,从而显示出对碱感的特异性。 TMC-1的异位表达使对碱不敏感的细胞具有碱敏感性。我们的结果确定了TMC在碱性感觉和伤害感受中的出乎意料的作用。

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