FoxOsは,系統限定の冗長性腫瘍抑制剤であり,内皮細胞ホメオスタシスを調節する
Ji-Hye Paik1, Ramya Kollipara, Gerald Chu
1Department of Medical Oncology, Dana-Farber Cancer Institute, Brigham and Women's Hospital, and Harvard Medical School, Boston, MA 02115, USA.
Cell
|January 27, 2007
まとめ
哺乳類のフォークヘッドボックスO (FoxO) 転写因子は,重要な腫瘍抑制剤である. すべてのFoxOを削除すると,がんが促進され,腫瘍的状態を予防し,血管ホメオスタシスを維持する役割が強調されます.
科学分野:
- 腫瘍学 腫瘍学
- 分子生物学は分子生物学である.
- 遺伝学 遺伝学とは
背景:
- フォスフォノシチド3キナーゼ (PI3K) -AKTシグナリングは,がんの発症に不可欠です.
- 哺乳類のフォークヘッドボックスO (FoxO) の転写因子 (FoxO1,FoxO3,FoxO4) は,PI3K-AKT信号伝達の下流効果因子である.
- PI3K-AKT駆動の腫瘍現象におけるFoxOsの役割は,調査を必要とする.
研究 の 目的:
- 哺乳類のFoxO転写因子のがん発症における機能を遺伝子的に分析する.
- FoxOsがPI3K-AKT経路活性化の文脈で腫瘍抑制剤として作用するかどうかを決定する.
- FoxO調節遺伝子と,内皮細胞機能と血管恒常性に関与する経路を特定する.
主な方法:
- ネズミ (生殖系と体系) でのFoxOアレルの遺伝的削除.
- 影響を受けた内皮細胞のトランスクリプトームとプロモーター分析.
- Sprouty2とPBX1.1を含む特定されたFoxO標的に関する機能的研究.
主要な成果:
- 最大5つのFoxOアレルの削除は,控えめな腫瘍のフェノタイプをもたらしました.
- すべてのFoxOsの広範な体的削除は,胸腺リンパ腫と血管腫を含む進行的な癌に弱い状態をもたらしました.
- ターゲット遺伝子のFoxOの調節は,in vivoでは文脈に特異的です.
- Sprouty2とPBX1は,FoxO調節による,内皮細胞形態変異と血管恒常性の媒介体として検証された.
結論:
- 哺乳類のフォックスオは,真の腫瘍抑制剤である.
- FoxO転写因子は,がんの発症を予防する上で重要な役割を果たします.
- FoxO媒介の調節は,血管の恒常性および内皮細胞の機能を維持するために不可欠です.
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