急性カンナビノイドは, Hippocampal LTDのアストログリアルCB1受容体調節を通して, 作業記憶を損なう
Jing Han1, Philip Kesner, Mathilde Metna-Laurent
1College of Life Sciences and Key Laboratory of Modern Teaching Technology, Shaanxi Normal University, Xian, China.
Cell
|March 6, 2012
まとめ
マリファナは,神経細胞ではなく,脳膠質のカンナビノイド受容体 (CB1R) を活性化することによって,空間的作業記憶 (SWM) を損なう. これは海馬のシナプス変化につながり,記憶機能に影響を及ぼします.
科学分野:
- 神経科学は神経科学である.
- 薬理学 薬理学とは
- 細胞生物学 細胞生物学
背景:
- 作業記憶障害は,マリファナ中毒の主要な効果です.
- 細胞および分子機構の正確なメカニズムは,ほとんど不明のままである.
- カナビノイドはシナプス可塑性に影響することが知られている.
研究 の 目的:
- カンナビノイド誘発の作業記憶障害の根本的なメカニズムを解明する.
- 異なるタイプの脳細胞における1型カンナビノイド受容体 (CB1R) の役割を調査する.
- シナプス可塑性と記憶の欠陥の関連性を調査する.
主な方法:
- アストログリア,グルタマタージック,またはGABAergicニューロンにCB1Rが欠けている条件付き変異性マウスを利用しました.
- 空間的作業記憶 (SWM) 欠陥と長期うつ病 (LTD) を誘発するために投与された外部カンナビノイド.
- ニューロンのN-メチル-D-アスパルテート受容体 (NMDAR) をブロックし,AMPA受容体密輸を研究した.
主要な成果:
- カンナビノイド誘発のSWM障害とヒポキャンパスのLTDは,アストログリアルCB1Rが欠けているマウスで廃止されました.
- これらの効果は,ニューロンにCB1Rが欠けていたマウスでは維持された.
- NMDARをブロックし,AMPA受容体密輸を変化させることで,カンナビノイド効果も廃止されました.
結論:
- マリファナによる作業記憶の障害は,アストログリアルCB1Rの活性化によって媒介されます.
- この障害は,ヒポカンプスのアストログリア依存性長期うつ病 (LTD) と関連しています.
- この発見は,カンナビノイドの認知効果を媒介するグリアの重要な役割を強調しています.
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