Frizzled-7のシグナリングは,Xenopus gastrulationの間に組織分離を制御しています
R Winklbauer1, A Medina, R K Swain
1Max-Planck-Institute for Developmental Biology, Department of Cell Biology, Spemann Strasse 35, D-72076 Tübingen, Germany.
Nature
|October 26, 2001
まとめ
Gタンパク質とタンパク質キナーゼC (PKC) を含む新しいFrizzled-7 (Fz7) シグナル伝達経路は,脊椎動物 gastrulationの間に細胞分類を制御しています. この経路は,メソデルマの分離と適切な胚の発達に不可欠です.
科学分野:
- 発達生物学 発達生物学について
- 細胞シグナル伝達 細胞信号伝達
- 分子生物学は分子生物学である.
背景:
- Frizled (Fz) 受容体は,メタゾアにおける複雑な細胞信号伝達を媒介する.
- Fz依存の経路は,胚の軸形成と細胞の極化を調節する.
- 明確なWntリガンド,Fz同型,および細胞文脈が経路の活性化を決定する.
研究 の 目的:
- Frizzled依存シグナリングカスケードを調査する.
- Fzシグナル伝達経路を識別するために,Dishevelledから独立している.
- 脊椎動物の胚発達におけるFz/PKCシグナル伝達の役割を明らかにする.
主な方法:
- Xenopus laevisの胚をモデルシステムとして利用した.
- Frizzled-7 (Fz7) の信号が調査されている.
- トリメリックGタンパク質とタンパク質キナーゼC (PKC) の役割を調べた.
- Fz7の機能喪失が胃に与える影響を評価した.
主要な成果:
- G タンパク質と PKC を含む,分散型独立の Fz 信号分岐を特定しました.
- Fz7依存のPKCシグナル伝達が,ガストルーレーション中のメソダーマ細胞の分類を調節することを示した.
- ジゴティックFz7機能の喪失は,前面メソデルマとエクトデルマの分離を阻害し,胃化の欠陥を引き起こすことを示した.
結論:
- 新しいFz/PKCシグナル伝達経路は,脊椎動物の胃刺激において重要な役割を果たしています.
- この経路は,中皮の細胞分類行動を制御するために不可欠です.
- 脊椎動物におけるFz/PKC経路の発達的関連性に関する最初のin vivo証拠を提供する.
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