VEGF-VEGFR2のシグナル伝達なしに血管新生を可能にするのは,VEGFR3のノッチ依存のアップレギュレーションです
Rui Benedito1, Susana F Rocha, Marina Woeste
1Max Planck Institute for Molecular Biomedicine, Department of Tissue Morphogenesis, D-48149 Münster, Germany. rui.benedito@mpi-muenster.mpg.de
Nature
|March 20, 2012
まとめ
ノッチ・シグナリングは,血管内皮成長因子受容体 (VEGFRs) を差異的に調節する. ノッチ阻害は,VEGFR2よりもVEGFR3に影響し,血管新生に不可欠な内皮の芽生えと増殖に影響します.
科学分野:
- 分子生物学は分子生物学である.
- 細胞生物学 細胞生物学
- 血管新生研究の研究
背景:
- 血管内皮成長因子 (VEGFs) とその受容体 (VEGFRs) は血管新生を駆動する.
- VEGFとNotch経路は相互接続しており,VEGF-AはNotchのリガンドであるDLL4を誘導し,内皮細胞の行動を調節する.
- DLL4-Notchシグナリングは,通常,芽生えと増殖を制御するためにVEGFR発現を抑制します.
研究 の 目的:
- 血管新生の調節におけるノッチ信号とVEGFR2/VEGFR3の正確な関係を調査する.
- VEGFR発現と内皮細胞の芽生えに対するNotch阻害の影響を決定する.
- Notchシグナル伝達によるVEGFRの微分調節を解明する.
主な方法:
- インデューシブル機能喪失遺伝学 in vivo.
- VEGFR2とNotchの信号伝達経路を阻害する.
- 網膜の尖端細胞におけるDLL4タンパク質発現の分析.
- 内皮の芽生えと増殖の評価.
主要な成果:
- 尖端細胞におけるDLL4タンパク質発現は,VEGFR2シグナル伝達による弱い調節を示した.
- ノッチ阻害はVEGFR2発現に有意な影響を及ぼさなかったが,誘発された無規制の内皮芽生えと増殖を引き起こした.
- VEGFR3はNotchによって強く調節され,VEGFR3阻害剤はNotchが低い条件で発芽を抑制した.
- VEGFR2とVEGFR3は,ノッチシグナリングによって差異的に調節されます.
結論:
- ノッチ・シグナリングは,VEGFR2とVEGFR3の異なる調節を示す.
- VEGFR2は,内皮の芽生えと増殖のノッチ媒介による調節に不可欠ではありません.
- 血管新生をターゲットにするには,内皮のNotchシグナリング状態を考慮する必要があります.
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