GABA signaling triggered by TMC-1/Tmc delays neuronal aging by inhibiting the PKC pathway in C. elegans.

GABA signaling triggered by TMC-1/Tmc delays neuronal aging by inhibiting the PKC pathway in C. elegans.
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DOI:
10.1126/sciadv.adc9236
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发表时间:
2022-12-21
期刊:
影响因子:
13.6
通讯作者:
--
中科院分区:
综合性期刊1区
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衰老导致神经元功能衰退和变性,是神经退行性疾病的主要危险因素。为了研究神经元衰老的分子机制,我们开发了一种新的管道,用于年轻和老年动物的神经元蛋白质组学分析。虽然整体翻译机制下调,但某些蛋白质在衰老时表达增加。在这些衰老上调蛋白中,保守的通道蛋白TMC-1/Tmc在所有测试的神经元中具有抗衰老功能,并且TMC-1的神经保护功能通过调节GABA信号而发生。此外,我们的研究结果还表明,TMC-1和GABA的抗神经元衰老作用需要代谢型GABA受体和G蛋白果阿-1/Goα的参与,GABA受体的激活通过抑制PLCβ-PKC通路来防止神经元衰老。最后,我们表明TMC-1-GABA-PKC信号轴抑制由人类Tau蛋白的致病形式引起的神经元功能下降。总之,我们的研究结果揭示了TMC-1-GABA-PKC信号轴在衰老和疾病条件下的神经保护功能。GABA能神经元中保守通道蛋白tmc-1的表达减缓线虫神经元衰老。
Aging causes functional decline and degeneration of neurons and is a major risk factor of neurodegenerative diseases. To investigate the molecular mechanisms underlying neuronal aging, we developed a new pipeline for neuronal proteomic profiling in young and aged animals. While the overall translational machinery is down-regulated, certain proteins increase expressions upon aging. Among these aging–up-regulated proteins, the conserved channel protein TMC-1/Tmc has an anti-aging function in all neurons tested, and the neuroprotective function of TMC-1 occurs by regulating GABA signaling. Moreover, our results show that metabotropic GABA receptors and G protein GOA-1/Goα are required for the anti-neuronal aging functions of TMC-1 and GABA, and the activation of GABA receptors prevents neuronal aging by inhibiting the PLCβ-PKC pathway. Last, we show that the TMC-1–GABA–PKC signaling axis suppresses neuronal functional decline caused by a pathogenic form of human Tau protein. Together, our findings reveal the neuroprotective function of the TMC-1–GABA–PKC signaling axis in aging and disease conditions. Expression of tmc-1, a conserved channel protein, in GABAergic neurons slows neuronal aging in nematodes.
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