恐怖の記憶は,回収後に再統合するために桃体内のタンパク質合成を必要とします
K Nader1, G E Schafe, J E Le Doux
1W.M. Keck Foundation Laboratory of Neurobiology, Center for Neural Science, New York University, New York 10003, USA. karim@cns.nyu.edu
Nature
|August 30, 2000
まとめ
再活性化された恐怖記憶は不安定になり,再統合のために新しいタンパク質合成を必要とします. このタンパク質合成は,回収後の記憶の安定化に不可欠であり,従来の統合理論に挑戦しています.
科学分野:
- 神経科学は神経科学である.
- 記憶の研究 記憶の研究
- 分子生物学は分子生物学である.
背景:
- 新しく形成された記憶は不安定で,長期保存に統合するためにタンパク質合成を必要とします.
- 桃体 (LBA) の側核と基礎核は,恐怖記憶の形成と保存に不可欠である.
研究 の 目的:
- 統合された恐怖記憶が再活性化後の再統合のためにタンパク質合成を必要とするかどうかを調査する.
- 再活性化された記憶が,タンパク質合成の抑制に敏感な不安定な状態を取り戻すかどうかを判断する.
主な方法:
- 恐怖記憶の再活性化後のネズミのLBAにアニソミシン (タンパク質合成阻害剤) を注入する.
- アニソミシン注入と再活性化後の後の時間点での記憶保持のテスト.
- アニソマイシンの効果を,遅延された注入または再活性化のないものと比較する.
主要な成果:
- 記憶の再活性化直後にアニソミシンを注入すると,後で記憶のリコールが低下し,再統合の失敗を示唆します.
- この記憶喪失効果は,再活性化がコンディショニング後1日か14日かに関係なく発生しました.
- 遅延したアニソマイシン注入 (再活性化後6時間) は記憶喪失を引き起こせず,タンパク質合成の時間制限の必要性を支持しました.
- 前回の記憶再活性化なしにアニソマイシンの投与は,記憶保持に影響を与えませんでした.
結論:
- 統合された恐怖記憶は,再活性化時に不安定な状態に入り,再統合のために新しいタンパク質合成を必要とします.
- これらの発見は,再活性化された記憶に対するタンパク質合成に依存した再統合プロセスを強調することによって,伝統的な記憶統合モデルに挑戦しています.
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