年齢に関連する作業記憶の低下のニューロン基盤
Min Wang1, Nao J Gamo, Yang Yang
1Department of Neurobiology, Yale University School of Medicine, New Haven, Connecticut 06510, USA.
Nature
|July 29, 2011
まとめ
正常な老化は,神経細胞の持続的な発火を減らすことにより,前頭前皮質 (PFC) の作業記憶を損なう. PFCニューロンの年齢関連の認知機能低下は,神経化学的環境を最適化することで逆転させることができます.
科学分野:
- 神経科学は神経科学である.
- 認知老化について
- 霊長類のモデル
背景:
- 正常な老化は,前頭前皮質 (PFC) 機能不全に関連した,実行機能の障害を含む認知障害と関連しています.
- PFCの重要な機能である作業記憶は,刺激ネットワークによって維持される持続的なニューロン発射に依存しています.
- 神経化学的環境は,この持続的な発火に重大な影響を及ぼし,上昇した循環AMPシグナリングがそれを減らすことが知られている.
研究 の 目的:
- 高齢類人猿の作業記憶中のPFCニューロンの生理学的性質を in vivoで調査する.
- 作業記憶のタスク中にPFCニューロンの機能を年齢に関連する分子変化が変化させるかどうかを判断する.
- 年齢に関連したPFC機能不全に対する潜在的な救済戦略を特定する.
主な方法:
- 作業記憶のタスク中に年配の猿のPFCニューロンから最初のin vivo録音を行った.
- 年齢との関係で DELAY ニューロンと CUE ニューロンの発火速度を特徴づけた.
- サイクルAMPシグナル伝達とカリウムチャネル活性を調節するための介入.
主要な成果:
- PFC DELAYニューロンでは,年齢に関係した持続的な発火の有意な損失が観察されました.
- CUEニューロンの発火率は,年齢とともに変わらない.
- cAMPシグナル伝達を阻害したり,HCN/KCNQチャネルをブロックしたりすると,老いたDELAYニューロンにおける記憶関連の発火が部分的に回復する.
結論:
- 背側PFCにおける年齢関連の認知機能低下の細胞基盤を明らかにした.
- PFCの神経機能の年齢関連の欠乏が逆行可能であることを実証した.
- 老化における認知機能を救うために神経化学的環境を標的とした治療的介入の可能性を強調した.
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