TRPA1 channels regulate astrocyte resting calcium and inhibitory synapse efficacy through GAT-3.

TRPA1 channels regulate astrocyte resting calcium and inhibitory synapse efficacy through GAT-3.
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DOI:
10.1038/nn.3000
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发表时间:
2011-12-11
影响因子:
25
通讯作者:
--
中科院分区:
医学1区
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星形胶质细胞有助于突触的形成和功能,并且在整个脑中发现,在脑中它们显示细胞内储存介导的Ca 2+信号。在这里,使用膜拴系的遗传编码的钙指示剂(LCK-GCaMP 3),我们报告了一个新的钙离子信号在大鼠海马星形胶质细胞神经元共培养的偶然发现。我们发现TRPA 1通道介导的Ca 2+通量引起频繁和高度局部化的近膜“斑点状”Ca 2+微区,其显著促进星形胶质细胞的静息Ca 2+水平。脑切片中的机制评估表明,降低星形胶质细胞静息Ca 2+水平介导的TRPA 1通道减少通过GAT-3减少GABA转运,从而提高细胞外GABA水平,降低神经元间抑制性突触的功效。我们的数据表明,一种新的跨膜钙源(TRPA 1)的目标是星形胶质细胞的转运蛋白(GAT-3),以调节抑制性突触。
Astrocytes contribute to the formation and function of synapses and are found throughout the brain where they display intracellular store mediated Ca2+ signals. Here, using a membrane tethered genetically encoded calcium indicator (Lck-GCaMP3), we report the serendipitous discovery of a novel Ca2+ signal in rat hippocampal astrocyte-neuron co-cultures. We found that TRPA1 channel mediated Ca2+ fluxes give rise to frequent and highly localised near membrane “spotty” Ca2+ microdomains that contribute significantly to resting Ca2+ levels of astrocytes. Mechanistic evaluations in brain slices show that decreasing astrocyte resting Ca2+ levels mediated by TRPA1 channels decreased interneuron inhibitory synapse efficacy by reducing GABA transport via GAT-3, thus elevating extracellular GABA levels. Our data indicate how a novel transmembrane Ca2+ source (TRPA1) targets a transporter (GAT-3) in astrocytes to regulate inhibitory synapses.
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