β-ニューレキシンは,シナプス内カンナビノイド信号を調節することによって神経回路を制御する
Garret R Anderson1, Jason Aoto2, Katsuhiko Tabuchi3
1Department of Molecular and Cellular Physiology, Stanford University Medical School, 265 Campus Drive, Stanford, CA 94305-5453, USA; Department of Psychiatry and Behavioral Sciences, Stanford University Medical School, 265 Campus Drive, Stanford, CA 94305-5453, USA.
Cell
|July 28, 2015
まとめ
プレシナプス βニューレキシンは神経伝達物質の放出とシナプス可塑性にとって極めて重要です. 欠乏すると ニューラル回路の学習と記憶に 障害が生じます
科学分野:
- 神経科学
- 分子生物学
- シナプスの可塑性
背景:
- α-およびβ-ニューレキシンは,自閉症と統合失調症に関連したシナプス前細胞粘着分子です.
- β-ニューレキシンはα-ニューレキシンより低い濃度で発現する.
研究 の 目的:
- 神経伝達物質の放出とシナプス機能における β-ニューレキシンの役割を調査する.
- エンドカンナビノイドシグナル伝達と神経回路調節におけるβニューレキシンの関与を決定する.
主な方法:
- 培養された皮質ニューロンと体内の β-ニューレキシンの条件付きノックアウト.
- CB1受容体と2 - アラキドノイルグリセロール合成の薬理学的抑制
- シナプス伝達と長期増強 (LTP) を評価するための電気生理学的記録.
- 恐怖の記憶を評価する行動テストです
主要な成果:
- 刺激性シナプスにおける神経伝達物質の放出が著しく減少した.
- ノックアウトフェノタイプは,CB1受容体または2- アラキドノイルグリセロール合成を阻害することによって調節された.
- 前シナプス β-ニューレキシンのノックアウトは,エンドカンナビノイド媒介による抑制を悪化させ,LTPを阻害し,薬学的介入によって効果は逆転した.
- CA1ニューロンの β-ニューレキシンのノックアウトは 背景的な恐怖記憶を損ねました
結論:
- 前シナプス β-ニューレキシンは,後シナプス 2 アラキドノイルグリセロルの合成を制御することによって,刺激性シナプスのシナプス強度を調節する.
- βニューレキシンは,エンドカンナビノイドに依存する神経回路の調節に予期せぬ役割を果たします.
- これらの発見はシナプス可塑性と記憶形成の 基礎にある分子メカニズムに光を当てています
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