GABA本身促进神经元GABAergic反应的发育转换,从激发到抑制
K Ganguly1, A F Schinder, S T Wong
1Program in Neuroscience, Division of Biology, University of California, San Diego, La Jolla, CA 92093, USA.
Cell
|May 24, 2001
概括
在大脑发育过程中,胺黄油酸 (GABA) 通常会从刺激转变为抑制. 这项研究表明GABA受体活性控制了这一关键发育开关的时间.
科学领域:
- 神经科学是一个神经科学.
- 发育生物学 发展生物学
- 神经化学 神经化学
背景情况:
- 胺黄油酸 (GABA) 是成人大脑中主要的抑制性神经递质.
- 在神经发育早期,GABAergic信号是刺激性的,影响神经元生长.
- 从刺激性转向抑制性GABAergic传播的发育转换发生在产后.
研究的目的:
- 研究调节GABAergic传播发育转换的机制.
- 确定GABAergic活性在调节这一关键过渡过程中的作用.
主要方法:
- 在发育模型中利用慢性阻塞和GABA (A) 受体的增加激活.
- 检查了谷氨酸转移和动作潜能阻塞的影响.
- 分析了KCC2共传媒体的信使RNA (mRNA) 水平.
- 测量了脱极化诱导的 (Ca2+) 流入.
主要成果:
- 长期阻断GABA (A) 受体延迟了从刺激到抑制的切换.
- 增加的GABA (A) 受体激活加速了切换.
- 无论是谷氨基基转移阻塞还是动作潜力阻塞都没有影响开关的时间.
- GABAergic活动调节了KCC2mRNA水平,与开关相关.
- GABA改变了脱极化诱导的Ca2+流入特性.
结论:
- GABAergic活性是其自身发育转换从刺激到抑制的关键调节者.
- 切换取决于GABA (A) 受体的激活,而不是一般的神经元活动.
- GABA通过调节KCC2表达和信号来影响神经元发育.
- 在神经发育过程中,GABA作为自我限制的营养因子起作用.
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