KCC2 expression promotes the termination of cortical interneuron migration in a voltage-sensitive calcium-dependent manner.

KCC2 expression promotes the termination of cortical interneuron migration in a voltage-sensitive calcium-dependent manner.
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DOI:
10.1016/j.neuron.2009.01.034
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发表时间:
2009-04-16
期刊:
影响因子:
16.2
通讯作者:
Polleux, Franck
Polleux, Franck
中科院分区:
医学1区
文献类型:
--
作者:
Bortone, Dante;Polleux, Franck

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控制皮质中间神经元迁移终止的分子机制尚不清楚。在这里,我们表明,在突触发生之前,迁移的中间神经元改变其对周围的GABA的反应,从一个motogenic停止信号。我们发现,在迁移到皮层,周围的GABA和谷氨酸最初刺激运动的中间神经元通过GABAA和AMPA/NMDA受体激活。一旦进入皮质,氯化钾共转运蛋白KCC 2的上调对于通过其在GABAA受体活化时降低膜电位的能力来降低中间神经元运动性是必要的且充分的,GABAA受体活化降低了由L型电压敏感性钙通道(VSCC)活化引发的自发细胞内钙瞬变的频率。我们的研究结果表明,一种新的机制,即迁移的中间神经元确定周围的中间神经元和主细胞的相对密度,通过他们的能力来感知环境谷氨酸和GABA的细胞外水平的结合,一旦GABAA受体激活成为超极化。
The molecular mechanisms controlling the termination of cortical interneuron migration are unknown. Here we demonstrate that prior to synaptogenesis, migrating interneurons change their responsiveness to ambient GABA from a motogenic to a stop signal. We found that during migration into the cortex, ambient GABA and glutamate initially stimulate the motility of interneurons through both GABAA and AMPA/NMDA receptor activation. Once in the cortex, up-regulation of the potassium-chloride co-transporter KCC2 is both necessary and sufficient to reduce interneuron motility through its ability to reduce membrane potential upon GABAA receptor activation which decrease the frequency of spontaneous intracellular calcium transients initiated by L-type Voltage-Sensitive Calcium Channels (VSCC) activation. Our results suggest a novel mechanism whereby migrating interneurons determine the relative density of surrounding interneurons and principal cells through their ability to sense the combined extracellular levels of ambient glutamate and GABA once GABAA receptor activation becomes hyperpolarizing.
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