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Ex Vivo Optogenetic Dissection of Fear Circuits in Brain Slices
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異なる神経回路によって恐怖をオン・オフする
Cyril Herry1, Stephane Ciocchi, Verena Senn
1Friedrich Miescher Institute for Biomedical Research, Maulbeerstrasse 66, CH-4058 Basel, Switzerland. cyril.herry@fmi.ch
Nature
|July 11, 2008
まとめ
動物は,基礎杏仁のニューロン活動を通じて,探検行動と防御行動の間で切り替わります. この研究は,特定の神経回路が恐怖の絶滅と再生をどのように制御するか明らかにし,生存戦略の洞察を提供します.
科学分野:
- 神経科学は神経科学である.
- 行動生物学 行動生物学
- 動物の行動 動物の行動
背景:
- 探索行動と防御行動の切り替えは,動物の生存に不可欠です.
- これらの行動的移行を制御する特定の神経回路は,ほとんど未知のままです.
研究 の 目的:
- マウスにおける恐怖の絶滅と,その文脈依存の更新との間の移行の基礎となる神経メカニズムを調査する.
- 双方向的な恐怖状態の調節における基礎性桃体ニューロンの役割を特定する.
主な方法:
- マウスにおける恐怖の絶滅と再生のパラダイムを利用した.
- ベースアミグダラの標的および可逆性ニューロン不活性化技術を採用した.
- ベースアミグダラの異なるニューロン集団のニューロン活動と,ヒポキャンパスと中央前頭前皮質との接続を調査した.
主要な成果:
- 高い恐怖状態と低い恐怖状態の双方向的な移行は,2つの異なる基礎桃体ニューロン集団の間の活動バランスの急速な切り替えによって引き起こされます.
- これらのニューロン集団は,海馬と中央前頭前皮質に接続された離散回路に統合されています.
- ベースアミグダラの無活性化により,記憶や表現に影響を与えることなく,行動状態の変化を防ぐことができました.
結論:
- ベースアミグダラの特定の神経回路は,文脈依存の恐怖行動の切り替えを媒介する.
- これらの回路の選択的活性化は,感覚情報と文脈情報を統合して,行動状態の変化を誘発します.
- 文脈依存の恐怖行動とその規制を理解するための新しい枠組みを提供します.
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