Peptide neurotransmitters activate a cation channel complex of NALCN and UNC-80.

Peptide neurotransmitters activate a cation channel complex of NALCN and UNC-80.
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肽神经递质激活 NALCN 和 UNC-80 的阳离子通道复合物。

DOI:
10.1038/nature07579
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发表时间:
2009-02-05
期刊:
影响因子:
64.8
通讯作者:
Ren, Dejian
Ren, Dejian
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Lu, Boxun;Su, Yanhua;Das, Sudipto;Wang, Haikun;Wang, Yan;Liu, Jin;Ren, Dejian

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几种神经递质通过g蛋白偶联受体(GPCR)起作用,引起神经元的“缓慢”兴奋。这些包括多肽,如P物质(SP)和神经紧张素(NT),以及乙酰胆碱和去甲肾上腺素。与小分子神经递质快速(~ ms)的离子化作用不同,慢激发在分子水平上还没有得到很好的理解,但主要归因于抑制K+电流和/或激活非选择性阳离子通道。这个阳离子通道的分子身份尚未确定;同样,通道是如何被激活的,以及它对神经肽诱导的神经元兴奋性的相对贡献是未知的。在这里,我们发现,在海马和腹侧被盖区神经元中,SP和NT激活了一个含有NALCN和一个大的新蛋白UNC-80的通道复合物。SP通过NK1R (SP的GPCR)激活是通过一种独特的机制:它不需要g蛋白激活,而是依赖于Src家族激酶(SFKs)。这些发现确定了NALCN是由SP受体激活的阳离子通道,并表明UNC-80和SFKs而不是g蛋白参与了从受体到通道的偶联。
Several neurotransmitters act through G-protein coupled receptors (GPCR) to evoke a “slow” excitation of neurons. These include peptides, such as substance P (SP) and neurotensin (NT), as well as acetylcholine and noradrenaline. Unlike the fast (~ ms) ionotropic actions of small molecule neurotransmitters, the slow excitation is not well understood at the molecular level, but can be mainly attributed to suppressing K+ currents and/or activating a non-selective cation channel. The molecular identity of this cation channel has yet to be determined; similarly how the channel is activated and its relative contribution to neuronal excitability induced by the neuropeptides are unknown. Here, we show that, in the hippocampal and ventral tegmental area neurons, SP and NT activate a channel complex containing NALCN and a large novel protein UNC-80. The activation by SP through NK1R (a GPCR for SP) is via a unique mechanism: it does not require G-protein activation but is dependent on Src family kinases (SFKs). These findings identify NALCN as the cation channel activated by SP receptor, and suggest that UNC-80 and SFKs, rather than a G-protein, are involved in the coupling from receptor to channel.
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