細胞老化中のp16INK4a発現に対するEtsとIdタンパク質の相反する効果
N Ohtani1, Z Zebedee, T J Huot
1Paterson Institute for Cancer Research, Christie Hospital NHS Trust, Manchester, UK.
Nature
|March 10, 2001
まとめ
Ets1とEts2の転写因子はp16INK4aの発現を調節し,細胞老化と腫瘍抑制の重要な要因である. Id1とのシグナル伝達経路と相互作用によって影響される彼らの活動は,細胞の成長停止を決定する.
科学分野:
- 細胞生物学 細胞生物学
- 分子生物学は分子生物学である.
- 腫瘍学 腫瘍学
背景:
- p16INK4aは,複製性衰老と腫瘍抑制に不可欠なサイクリン依存キナーゼ阻害剤です.
- 衰老におけるp16INK4aの発現を制御するメカニズムと,腫瘍抑制剤としてのその役割は完全に理解されていません.
研究 の 目的:
- p16INK4a発現を調節するEts1およびEts2転写因子の役割を調査する.
- 人間の二倍体線維芽細胞におけるp16INK4aプロモーターの活性を制御するメカニズムを解明する.
主な方法:
- p16INK4aのプロモーター活動の分析.
- 人間の二倍体線維芽細胞における Ets1, Ets2, Id1 の発現パターンを研究.
- Ras-Raf-MEKシグナル伝達とId1相互作用がp16INK4a誘導に及ぼす影響を調査する.
主要な成果:
- Ets1とEts2は,ETS結合部位を通じたp16INK4aプロモーターを活性化する.
- Ets2は若い線維芽細胞のp16INK4aを誘導し,Ras-Raf-MEKシグナル伝達によって強化され,Id1.1によって抑制されます.
- 衰老細胞では,減少したEts2およびMEKシグナル伝達,減少したId1および増加したEts1と共に,増加したp16INK4a発現と相関する.
結論:
- Ets1とEts2は,細胞老化中のp16INK4a発現の重要なレギュレータである.
- Ets転写因子であるId1とRas-Raf-MEK経路の相互作用により,p16INK4aレベルと細胞成長の停止が制御されます.
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