グリア由来のDセリンは,NMDA受容体活性とシナプス記憶を制御する
Aude Panatier1, Dionysia T Theodosis, Jean-Pierre Mothet
1Inserm, U378, Bordeaux, F-33077, France.
Cell
|May 23, 2006
まとめ
アストロサイトは,D-セリンのレベルを制御することによって,N-メチル-D-アスパルテート (NMDA) 受容体活性を調節する. ニューロン-アストロサイト相互作用は,シナプス可塑性と脳シグナル伝達を調節する.
科学分野:
- 神経科学は神経科学である.
- 細胞生物学 細胞生物学
- シナプスの可塑性
背景:
- NMDA受容体は,中枢神経系の興奮伝達とシナプス可塑性にとって極めて重要です.
- NMDA受容体の活性化には,グルタミン酸と,D-セリンなどの共同アゴニストが,グリシン部位で必要となる.
研究 の 目的:
- NMDA受容体に依存する活性と可塑性に対する膠質環境の生理学的影響を調査する.
- NMDA受容体の機能を調節するアストロサイトの役割を決定する.
主な方法:
- 哺乳期中のニューロンのアストロサイト性包帯の変化を利用して,超光学核を研究した.
- アストロサイトカバレッジに関連したNMDA受容体の共アゴニストのダイナミクスを調査した.
主要な成果:
- グリシンではなく,D-セリンが,超光学核のNMDA受容体の内生的な共同アゴニストであるという直接的な証拠を提供した.
- 神経細胞のアストロサイトカバレッジの範囲が,NMDA受容体におけるグリシン部位の占有率を決定することを実証した.
結論:
- アストロサイトカバレッジは,NMDA受容体の可用性と活性化に直接影響を与えます.
- アストロサイトがシナプス性メタプラスティシティに与える貢献は,脳シグナル伝達におけるダイナミックなパートナーとしての役割を強調しています.
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