ヒポキャンパスのシナプス性可塑性の方向を制御するNMDA受容体のサブタイプの役割
Lidong Liu1, Tak Pan Wong, Mario F Pozza
1Brain Research Centre, University of British Columbia, 2211 Wesbrook Mall, Vancouver, BC V6T 2B5, Canada.
Science (New York, N.Y.)
|May 15, 2004
まとめ
明確なN-メチル-D-アスパラテート受容体 (NMDARs) はシナプス可塑性を制御する. NR2Bを含むNMDARは長期うつ病 (LTD) に至关重要であり,NR2Aを含むNMDARは長期増強 (LTP) に不可欠である.
科学分野:
- 神経科学は神経科学である.
- シナプスの可塑性
- 分子生物学は分子生物学である.
背景:
- 海馬のCA1シナプスにおける長期増強 (LTP) と長期抑うつ (LTD) は,学習と記憶に不可欠である.
- N-メチル-D-アスパラテート受容体 (NMDARs) は,LTPとLTDの両方にとって不可欠ですが,それらの対極的な役割を決定するメカニズムは不明です.
研究 の 目的:
- シナプス可塑性の極性決定における異なるNMDARサブユニットの特定の役割を調査する.
- どのようにしてNMDARの活性化が相反するシナプス可塑性の形態につながるのかを解明する.
主な方法:
- ヒポキャンパスのスライス製剤を使用した.
- 特定のサブユニット (NR2AおよびNR2B) を含むNMDARの選択的ブロックを使用した.
- LTPとLTDの誘導への影響を評価しました.
主要な成果:
- NR2Bを含むNMDARの選択的封鎖はLTD誘導を廃止したが,LTPには影響しなかった.
- NR2Aを含むNMDARsの好ましい阻害は,LTD.に影響を与えることなくLTP誘導を防止しました.
- 異なるNMDARサブユニットがシナプス可塑性の方向性を決定することを示した.
結論:
- NR2Bを含むNMDARは,LTDにとって非常に重要です.
- NR2Aを含むNMDARは,LTPにとって重要である.
- NMDARサブユニットの組成は,シナプス可塑性の極性性の重要な決定因子です.
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