アナンドマイドとアラキドン酸は,エポキシエコサトリエノ酸を使用してTRPV4チャネルを活性化します
Hiroyuki Watanabe1, Joris Vriens, Jean Prenen
1Department of Physiology, Campus Gasthuisberg, KU Leuven, B-3000 Leuven, Belgium.
Nature
|July 25, 2003
まとめ
エンドカンナビノイドアナンドマイドは,エポキシエコサトリエノ酸を介してTRPV4チャネルを間接的に活性化します. この発見は,内生化合物によるTRPV4チャネル調節のための新しいメカニズムを明らかにします.
科学分野:
- 分子生物学は分子生物学である.
- 生理学 生理学とは
- エンドクリノロジー エンドクリノロジー
背景:
- トランジエント受容体潜在バニロイド4 (TRPV4) は,様々な生理学的プロセスに関与するカルシウム (Ca2+) チャンネルです.
- TRPV4は物理的刺激と合成リガンドに反応しますが,内生活性化剤は不明です.
- エンドカンナビノイドは,アナンダミドと同様に,多様な生物学的役割を持つ内生的なシグナル伝達脂質です.
研究 の 目的:
- TRPV4チャネルを活性化する内生リガンドを特定する.
- アナンドマイドとその代謝産物がTRPV4と相互作用するメカニズムを解明する.
- 血管内皮細胞におけるTRPV4活性化の役割を調査する.
主な方法:
- パッチクランプの電気生理学で,Ca2+流入を測定する.
- TRPV4チャネル活動を評価するための細胞ベースの測定法.
- 信号代謝物質を特定するための生化学分析.
主要な成果:
- アナンダミドとアラキドン酸は,シトクロームP450エポキシゲネーゼの代謝物を通して間接的にTRPV4を活性化します.
- 5',6'-エポキシエコサトリエノ酸 (5,6-EET) は,TRPV4を微小分子の濃度で直接活性化する.
- 5,6-EET誘発のTRPV4の活性化により,血管内皮細胞にCa2+が流入する.
結論:
- エポキシエコサトリエノ酸は,TRPV4チャネルの新たな内生活性化剤である.
- エンドカンナビノイド代謝産物によるTRPV4の活性化は,血管調節に寄与する可能性があります.
- この研究は,TRPV4とエンドカンナビノイド系を含む新しいシグナル伝達経路を発見した.
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