GABA自体は,神経細胞のGABAergic応答の発達のスイッチを刺激から抑制に促進します
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
まとめ
ガンマアミノバター酸 (GABA) は,通常,脳の発達中に刺激性から抑制性へと切り替わります. この研究は,GABA受容体の活性が,この重要な発達スイッチのタイミングを制御することを示しています.
科学分野:
- 神経科学は神経科学である.
- 発達生物学 発達生物学について
- 神経化学 神経化学とは
背景:
- ガンマアミノバター酸 (GABA) は,大人の脳における主要な抑制性神経伝達物質である.
- 神経の発達初期に,GABAergicシグナル伝達は刺激的で,神経細胞の成長に影響を与えます.
- 刺激性から阻害性GABAergic伝播への発達的な切り替えは,産後発生します.
研究 の 目的:
- GABAergic伝播の発達的なスイッチを調節するメカニズムを調査する.
- この重要な移行を調節するGABAergic活動の役割を決定する.
主な方法:
- 開発モデルで GABA (A) 受容体の慢性阻害と活性化を高めました.
- グルタマタージック伝達とアクションポテンシャルブロックの効果を調べた.
- KCC2コトランスポーターのメッセンジャーRNA (mRNA) レベルを分析した.
- 測定された脱極化誘発カルシウム (Ca2+) 流入.
主要な成果:
- GABA (A) 受容体の慢性的な阻害は,刺激から阻害へのスイッチを遅らせました.
- 増加したGABA (A) 受容体の活性化により,スイッチが加速した.
- グルタマタージック伝達阻害もアクションポテンシャル阻害も,スイッチのタイミングに影響しませんでした.
- GABAergic活性がKCC2mRNAレベルを調節し,スイッチと相関する.
- GABAは脱極化誘発によるCa2+流入特性を変化させた.
結論:
- GABAergic活動は,刺激性から抑制性への自己発達のスイッチの重要なレギュラーです.
- このスイッチはGABA (((A)) 受容体の活性化に依存し,一般的な神経活動に依存しません.
- GABAは,KCC2発現とカルシウムシグナル伝達を調節することによって,ニューロンの発達に影響を与えます.
- GABAは,神経発達の過程で自己制限のトロフィック因子として機能する.
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