リガンド特異のc-Fos発現は,ErbBネットワークダイナミクスの空間時間的な制御から生じる
Takashi Nakakuki1, Marc R Birtwistle, Yuko Saeki
1Computational Systems Biology Research Group, Advanced Computational Sciences Department, RIKEN Advanced Science Institute, 1-7-22 Tsurumi-ku, Yokohama, Kanagawa 230-0045, Japan.
Cell
|May 25, 2010
まとめ
皮膚表皮成長因子 (EGF) とヘレグルリン (HRG) は,共有された経路を通じて異なる細胞運命を誘発する. 数学的モデリングは,これらのリガンドがERK信号ダイナミクスを制御することによって,ユニークなc-Fos応答を生成する方法を示しています.
科学分野:
- 細胞信号伝達と分子生物学
- 信号伝達経路は,信号伝達経路である.
- 遺伝子調節 遺伝子調節
背景:
- 皮膚表皮成長因子 (EGF) とヘレグルリン (HRG) は,ErbB受容体を活性化し,共有されたシグナル伝達経路を通じて,異なる細胞運命決定につながります.
- これらのリガンドが異なる細胞反応を生成するメカニズムを理解することは,細胞運命を決定する解読に不可欠です.
研究 の 目的:
- 皮膚表皮成長因子 (EGF) とヘレグルリン (HRG) が,リン酸化転写因子c-Fos.の異なるオール・オア・ノー反応を生成する方法を解明する.
- 細胞外シグナル調節キナーゼ (ERK) 活性化ダイナミクスが,リガンド特異的な細胞のアウトカムを媒介する役割を調査する.
主な方法:
- 信号経路の分析に数学モデリングと実験的アプローチを活用した.
- 核ERK活性とc-fos mRNA発現を調節する役割の評価のために,二重特異性フォスファタゼのノックダウンを行った.
- HRG誘発の転写抑制における新しいタンパク質合成の必要性を調査した.
主要な成果:
- EGFは一時的な細胞細胞 ERKの活性化を誘導し,HRGは持続的な活性化を誘導する.
- 核ERKの活性とc-fos mRNAの発現は,EGFとHRGの両方にとって一時的なものです.
- 新しいタンパク質合成を必要とするHRG誘発の抑制剤が特定され,核ERKの持続時間に関係なく,c-fos mRNA発現を制限しました.
結論:
- 空間的に分布した信号転写カスケードは,c-Fosシステムレベルで,一時的なERK活動と持続的なERK活動を強く区別します.
- 特定された制御メカニズムは一般的で,異なる細胞タイプとリガンド刺激に適用できます.
- この研究は,リガンド特異の細胞応答に貢献する転写抑制の新しいメカニズムを明らかにしています.
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