Peripheral sensitisation of nociceptors via G-protein-dependent potentiation of mechanotransduction currents.

Peripheral sensitisation of nociceptors via G-protein-dependent potentiation of mechanotransduction currents.
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DOI:
10.1113/jphysiol.2009.175059
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发表时间:
2009-07-15
期刊:
The Journal of physiology
影响因子:
--
通讯作者:
Lewin GR
Lewin GR
中科院分区:
其他
文献类型:
--
作者:
Lechner SG;Lewin GR

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撞击在皮肤上的机械刺激通过位于背根神经节(DRG)神经元的外周神经末梢处的机械门控离子通道转换成电信号。在炎症条件下,感觉神经元通常对机械刺激敏感;可能有助于感觉神经元的这种敏感的推定机制是机械转导离子通道的响应性增强。在这里,我们表明,促藻素UTP和ATP增强机械敏感性RA电流肽能伤害性DRG神经元,并降低阈值,机械诱导的动作电位在这些神经元的放电。药理学表征表明,这种作用是由Gq偶联的P2 Y2核苷酸受体介导的。此外,使用体外皮肤神经技术,我们表明,UTP也增加动作电位放电率在皮肤C-纤维伤害感受器的亚群中的机械刺激。总之,我们的研究结果表明,UTP敏感的皮肤C-纤维伤害感受器通过以前未描述的G-蛋白依赖性增强机械激活RA型电流的亚群。
Mechanical stimuli impinging on the skin are converted into electrical signals by mechanically gated ion channels located at the peripheral nerve endings of dorsal root ganglion (DRG) neurons. Under inflammatory conditions sensory neurons are commonly sensitised to mechanical stimuli; a putative mechanism that may contribute to such sensitisation of sensory neurons is enhanced responsiveness of mechanotransduction ion channels. Here we show that the algogens UTP and ATP potentiate mechanosensitive RA currents in peptidergic nociceptive DRG neurons and reduce thresholds for mechanically induced action potential firing in these neurones. Pharmacological characterisation suggests that this effect is mediated by the Gq-coupled P2Y2 nucleotide receptor. Moreover, using the in vitro skin nerve technique, we show that UTP also increases action potential firing rates in response to mechanical stimuli in a subpopulation of skin C-fibre nociceptors. Together our findings suggest that UTP sensitises a subpopulation of cutaneous C-fibre nociceptors via a previously undescribed G-protein-dependent potentiation of mechanically activated RA-type currents.
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