Grb2のMet受容体からの分離は,体内では,筋肉の発達における複雑な役割を明らかにしています
F Maina1, F Casagranda, E Audero
1European Molecular Biology Laboratory, Heidelberg, Federal Republic of Germany.
Cell
|November 1, 1996
まとめ
肝細胞成長因子 (HGF) は,その受容体Metを通じたシグナル伝達を行うため,開発には特定のチロシンが必要です. これらの部位の破壊は胎盤,肝臓,筋肉に影響を及ぼし,後期的な筋肉形成におけるMETの役割を明らかにします.
科学分野:
- 分子生物学は分子生物学である.
- 発達生物学 発達生物学について
- 遺伝学 遺伝学とは
背景:
- 肝細胞成長因子 (HGF) とその受容体であるメトチロシンキナーゼは,発達に不可欠です.
- メートシグナル伝達は,胎盤,肝臓,筋肉形成に不可欠です.
- Metシグナル伝達 in vivoの正確なメカニズムは完全に理解されていません.
研究 の 目的:
- カーボキシ末端チロシンによるMetシグナル伝達のインビボ要件を調査する.
- 異なる組織におけるMetシグナル伝達経路の特定の役割を解明する.
- ミオゲネシスにおけるHGF/Metシグナル伝達の新しい機能を特定する.
主な方法:
- Met Carboxy-terminal ティロシンに特異的な突然変異がある突然変異のマウスの生成.
- 胎盤,肝臓,筋肉の発達に焦点を当てた変異胚のフェノタイプ分析.
- Grb2結合障害の評価とMetシグナル伝達への影響.
主要な成果:
- Metにおけるカーボキシ末端チロシンの両方の変異は,胎盤,肝臓,四肢の筋肉に重度の欠陥を伴う胚死亡を引き起こした.
- Grb2結合部位を遮断すると,長さの発達が可能になったが,末肢の筋肉の減少と二次繊維の減少をもたらした.
- これらの発見は,Metシグナル伝達経路に対する組織特有の要求を示しています.
結論:
- in vivoのメット機能は,2つの重要なカーボキシ末端チロシンを通じたシグナル伝達に依存しています.
- HGF/Metシグナル伝達は,骨髄形成の遅い段階で,これまで認識されていない重要な役割を果たしています.
- この研究は,様々な発達状況におけるメットシグナリングの異なる要件を強調しています.
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