Evidence for a protein tether involved in somatic touch.

Evidence for a protein tether involved in somatic touch.
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参与体触感的蛋白质系的证据。

DOI:
10.1038/emboj.2009.398
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发表时间:
2010-02-17
期刊:
影响因子:
11.4
通讯作者:
Lewin, Gary R.
Lewin, Gary R.
中科院分区:
生物学1区
文献类型:
--
作者:
Hu, Jing;Chiang, Li-Yang;Koch, Manuel;Lewin, Gary R.

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通过机械力对离子通道的门控是触觉和疼痛感的基础。脊椎动物触觉感受器中机械敏感离子通道的门控模式尚不清楚。在这里,我们表明,蛋白质连接的存在是必要的门控的机械敏感电流在所有低阈值mechanoreceptors和背根神经节(DRG)的一些伤害感受器。利用透射电镜,我们证明了一个长度约为100 nm的蛋白丝是由感觉神经元合成的,并可能将感觉神经元中的机械敏感离子通道连接到细胞外基质。用非特异性和位点特异性内肽酶对感觉神经元进行短暂治疗会破坏蛋白质系链,并在不影响电兴奋性的情况下消除感觉神经元中的机械敏感电流。体内触觉感受器功能也需要蛋白酶敏感的系链。因此,与大多数伤害感受器不同,皮肤机械感受器需要独特的蛋白质系链来抑制机械刺激。
The gating of ion channels by mechanical force underlies the sense of touch and pain. The mode of gating of mechanosensitive ion channels in vertebrate touch receptors is unknown. Here we show that the presence of a protein link is necessary for the gating of mechanosensitive currents in all low-threshold mechanoreceptors and some nociceptors of the dorsal root ganglia (DRG). Using TEM, we demonstrate that a protein filament with of length ∼100 nm is synthesized by sensory neurons and may link mechanosensitive ion channels in sensory neurons to the extracellular matrix. Brief treatment of sensory neurons with non-specific and site-specific endopeptidases destroys the protein tether and abolishes mechanosensitive currents in sensory neurons without affecting electrical excitability. Protease-sensitive tethers are also required for touch-receptor function in vivo. Thus, unlike the majority of nociceptors, cutaneous mechanoreceptors require a distinct protein tether to transduce mechanical stimuli.
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