ベントラル・テグメンタル領域のGABA投影は,アキュンバル・ホリナージック・インターニューロンを一時停止させ,協同学習を強化する
Matthew T C Brown1, Kelly R Tan, Eoin C O'Connor
1Department of Basic Neurosciences, Medical Faculty, University of Geneva, CH-1211 Geneva, Switzerland.
Nature
|November 27, 2012
まとめ
ベントラル・テグメンタル・エリア (VTA) のGABAニューロンは,核アキュンベンス (NAc) のコリン神経内ニューロンを阻害し,刺激結果学習を強化します. このVTA-NAc経路は,脳が重要な環境的シグナルとの関連をどのように学習するかを精製します.
科学分野:
- 神経科学は神経科学である.
- 行動神経科学は,行動神経科学である.
- 細胞神経科学は細胞神経科学である.
背景:
- ベントラル・テグメンタル領域 (VTA) とアキュンベンス核 (NAc) は,動機付け的に重要な刺激を処理する上で重要な役割を果たします.
- 伝統的にVTA内のドーパミンニューロンは,報酬学習のためのVTA-NAc通信を媒介すると考えられています.
- NAcに投影するVTAのGABA (γ-アミノバター酸) を放出するニューロンの役割は,まだあまり理解されていません.
研究 の 目的:
- VTA GABAニューロンからNAcへの長距離阻害投影の細胞標的と機能的意義を調査する.
- 刺激結果学習におけるVTA GABA投影ニューロンの役割を明らかにする.
主な方法:
- 歯類のモデルにおける構造イメージングと電気生理学と組み合わせた光遺伝学.
- NAcニューロンにおける阻害性ポストシナプス電流の記録.
- 刺激-結果関連学習と差別タスクを含む行動実験.
主要な成果:
- VTA GABA投射ニューロンは,複数のシナプスコンタクトを通じてNAcコレリン性内ニューロン (CINs) を選択的に標的にし,抑制します.
- このVTA-NAc GABAergicプロジェクションの活性化により,CIN活動が一時停止し,学習中に見られるパターンを模倣します.
- 行動するマウスのCINを抑制することで,嫌悪的な結果に関連する刺激の差別が改善されました.
結論:
- VTA GABA投射ニューロンは,NAcへの新しい抑制経路を提供し,コレリン活性を調節します.
- この経路は,NAc CINsを調節することによって,刺激結果学習を強化します.
- VTA GABAニューロンは,NAcへのVTAの突起性の伝達の主なオーケストラとして機能し,ドーパミナージックシステムとコレリンジェルジックシステムの両方に影響を与えます.
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