Wnt11は,L型Ca2+) チャンネルを調節することによって,心筋の電気グラデントをパターン化します
Daniela Panáková1, Andreas A Werdich, Calum A Macrae
1Brigham and Women's Hospital/Harvard Medical School, Cardiovascular Division, 75 Francis Street, Thorn 11, Boston, Massachusetts 02115, USA.
Nature
|July 27, 2010
まとめ
電気的グラデーションは生物の発達に不可欠である. この研究は,非正規のWnt11信号が,ゼブラフィッシュの心臓のL型カルシウムチャネルを調節することによって,心筋の電気グラデーションを確立することを明らかにしています.
科学分野:
- 発達生物学 発達生物学とは
- 電気生理学 電気生理学
- 細胞シグナル伝達 細胞信号伝達
背景:
- 電気的グラデーションは,オルガノゲネシスや傷の治癒などの生物学的プロセスに不可欠です.
- 電気的極性の確立と維持を規制するメカニズムは十分に理解されていません.
- これらのメカニズムを理解することは,根本的な発達プロセスを解読する鍵です.
研究 の 目的:
- 発達中の心筋に電気グラデントが形成されるメカニズムを特定する.
- 心臓の電気的極性におけるWnt11信号伝達の役割を調査する.
- 心筋の電気グラデーションを生成する分子プレーヤーを解明する.
主な方法:
- 斑馬魚の心臓におけるトランスメブランポテンシャルとカルシウム濃度の高速光学マッピング.
- 細胞興奮性,コネクシン局所化,組織幾何学,および機械的入力における役割が調査された.
- Wnt11の信号伝達経路を評価するために遺伝子操作を用いた.
主要な成果:
- 発達中の心室動脈の全域にわたる電気結合のグラデントを特定しました.
- 非正規のWnt11信号が,この心筋の電気グラデントに必要であることを実証した.
- 図示のWnt11は,平面細胞の極性経路とは独立して,L型カルシウムチャネルを介して,トランスメブランのCa(2+) 伝導性を調節する.
結論:
- 非正規のWnt11シグナリングは,L型カルシウムチャネル媒介のCa2+) 伝導性を介して心筋の電気グラデーションを確立します.
- これは,心臓の発達と電気的極性におけるWnt/Ca2+) 信号伝達の新たな役割を明らかにしています.
- Wnt信号によるセルラーカップリングの調節は,開発中の一般的なメカニズムである可能性があります.
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