Ca(2+) signaling evoked by activation of Na(+) channels and Na(+)/Ca(2+) exchangers is required for GABA-induced NG2 cell migration.

Ca(2+) signaling evoked by activation of Na(+) channels and Na(+)/Ca(2+) exchangers is required for GABA-induced NG2 cell migration.
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GABA 诱导的 NG2 细胞迁移需要 Na 通道和 Na /Ca2 交换器激活引起的 Ca2 信号传导

DOI:
10.1083/jcb.200811071
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发表时间:
2009-07-13
期刊:
The Journal of cell biology
影响因子:
--
通讯作者:
Duan S
Duan S
中科院分区:
其他
文献类型:
--
作者:
Tong XP;Li XY;Zhou B;Shen W;Zhang ZJ;Xu TL;Duan S

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NG 2细胞起源于不同的大脑区域,并在早期发育过程中迁移到目的地。这些细胞表达电压门控Na+通道,但无法产生典型的动作电位。Na+通道在这些细胞中的生理作用尚不清楚。我们发现,GABA诱导NG 2细胞膜去极化和Ca 2+升高,这一过程需要激活GABAA受体、Na+通道和Na+/Ca 2+交换器(NCXs),但不激活Ca 2+通道。我们已经确定了一个持续的Na+电流在这些细胞中,可能是GABA诱导的长期Na+升高的途径,这反过来又触发Ca 2+内流通过NCXs。这种独特的Ca 2+信号通路进一步被证明参与NG 2细胞的迁移。因此,由GABAA受体、非失活Na+通道和NCXs的顺序激活介导的GABA能信号传导可能在脑中NG 2胶质细胞的发育和功能中发挥重要作用。
NG2 cells originate from various brain regions and migrate to their destinations during early development. These cells express voltage-gated Na+ channels but fail to produce typical action potentials. The physiological role of Na+ channels in these cells is unclear. We found that GABA induces membrane depolarization and Ca2+ elevation in NG2 cells, a process requiring activation of GABAA receptors, Na+ channels, and Na+/Ca2+ exchangers (NCXs), but not Ca2+ channels. We have identified a persistent Na+ current in these cells that may underlie the GABA-induced pathway of prolonged Na+ elevation, which in turn triggers Ca2+ influx via NCXs. This unique Ca2+ signaling pathway is further shown to be involved in the migration of NG2 cells. Thus, GABAergic signaling mediated by sequential activation of GABAA receptors, noninactivating Na+ channels, and NCXs may play an important role in the development and function of NG2 glial cells in the brain.
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