A neuron-glia interaction involving GABA transaminase contributes to sleep loss in sleepless mutants.

A neuron-glia interaction involving GABA transaminase contributes to sleep loss in sleepless mutants.
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涉及GABA转氨酶的神经元-GLIA相互作用有助于失眠突变体的睡眠丧失。

DOI:
10.1038/mp.2014.11
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发表时间:
2015-02
影响因子:
11
通讯作者:
Sehgal, A.
Sehgal, A.
中科院分区:
医学1区
文献类型:
--
作者:
Chen, W-F;Maguire, S.;Sowcik, M.;Luo, W.;Koh, K.;Sehgal, A.

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睡眠是一个重要的过程,但其背后的机制还没有得到很好的理解。果蝇qvr/sss基因的缺失增加了神经元的兴奋性,减少了日常睡眠,为探索睡眠调节的基础提供了一个很好的模型。在这里,我们使用蛋白质组学的方法来鉴定sss大脑中改变的蛋白质。我们报告说,失眠的转录后升高CG 7433蛋白,线粒体γ-氨基丁酸转氨酶(GABAT),并减少GABA在苍蝇的大脑。GABAT的损失增加了日常睡眠,改善了睡眠巩固,表明GABAT促进了觉醒。重要的是,GABAT基因的破坏完全抑制了sss突变体的睡眠表型,表明GABAT是sss突变体睡眠丧失所必需的。虽然SSS作用于不同的神经元群体,但GABAT作用于神经胶质细胞以减少SSS果蝇的睡眠。我们的研究结果确定了一种新的神经元和神经胶质细胞之间的相互作用机制,这对睡眠的调节很重要。
Sleep is an essential process and yet mechanisms underlying it are not well understood. Loss of the Drosophila quiver/sleepless (qvr/sss) gene increases neuronal excitability and diminishes daily sleep, providing an excellent model for exploring the underpinnings of sleep regulation. Here, we used a proteomic approach to identify proteins altered in sss brains. We report that loss of sleepless post-transcriptionally elevates the CG7433 protein, a mitochondrial γ-aminobutyric acid transaminase (GABAT), and reduces GABA in fly brains. Loss of GABAT increases daily sleep and improves sleep consolidation, indicating that GABAT promotes wakefulness. Importantly, disruption of the GABAT gene completely suppresses the sleep phenotype of sss mutants, demonstrating that GABAT is required for loss of sleep in sss mutants. While SSS acts in distinct populations of neurons, GABAT acts in glia to reduce sleep in sss flies. Our results identify a novel mechanism of interaction between neurons and glia that is important for the regulation of sleep.
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