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リン酸化c-JunとTCF4の相互作用は,腸がんの発症を調節する
Abdolrahman S Nateri1, Bradley Spencer-Dene, Axel Behrens
1Mammalian Genetics Laboratory, CR UK London Research Institute, Lincoln's Inn Fields Laboratories, 44 Lincoln's Inn Fields, London WC2A 3PX, UK.
Nature
|July 12, 2005
まとめ
c-Jun N-ターミナルキナーゼ (JNKs) によってプロトオンコプロテインc-Junのリン酸化により,TCF4との相互作用が強化され,腸内腫瘍の成長を促します. この相互作用を阻害すると,腫瘍の発達が減り,WNT駆動の腫瘍発生における重要な規制メカニズムが浮き彫りにされる.
科学分野:
- 分子生物学は分子生物学である.
- 腫瘍学 腫瘍学
- 細胞シグナル伝達 細胞信号伝達
背景:
- プロトオンコプロテインc-Junは,AP-1転写因子の重要な成分であり,その活動は多くの癌で上昇しています.
- c-Jun N-ターミナルキナーゼ (JNKs) によってc-Junのアミノ末端リン酸化により,AP-1の活性と生物学的機能が著しく向上します.
- リン酸化c-Junは,他のタンパク質と結合する能力が向上したため,部分的に活性性が増加しています.
研究 の 目的:
- 転写因子TCF4.4との相互作用の調節におけるc-ジュンリン酸化の役割を調査する.
- c-Jun,TCF4,およびβ-cateninを含む三元複合体の形成を解明する.
- c-Jun/TCF4の相互作用が腸内腫瘍形成とWNT信号伝達経路に与える影響を決定する.
主な方法:
- クロマチンの免疫プレシピテーション測定は,c-junプロモーターにおけるJNK依存のc-Jun-TCF4相互作用を検出する.
- レポーターは,c-junとTCF4によるc-junプロモーターの協同活性化をβ-カテンリン依存の方法で評価するアッセイを行う.
- Apc(Min) マウスモデルを用いて,腸内腫瘍の発達に対するc-jun酸化またはc-jun無活性化の廃止によるインビボ効果を評価する.
主要な成果:
- リン酸化c-JunがTCF4と相互作用し,β-cateninと三元複合体を形成することを示した.
- 確認されたJNK依存のc-jun-TCF4がc-junプロモーターに結合している.
- c-junとTCF4が協力してβ-catenin経由でc-junプロモーターを活性化することを示した.
- マウスにおけるc-jun酸化または条件付きc-jun不活性化の遺伝的廃止により,腸内腫瘍の数とサイズが著しく減少し,寿命が延びた.
結論:
- c-JunとTCF4のリン酸化依存相互作用は,腸内腫瘍発生の重要な調節因子である.
- この相互作用は,JNKとAPC/β-カタニン信号伝達経路を統合し,どちらもWNT信号伝達によって活性化されます.
- c-Jun/TCF4の相互作用をターゲットにすることは,WNT誘発性腸がんに対する潜在的な治療戦略です.
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