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哺乳類のUVC反応における成長因子受容体の関与
C Sachsenmaier1, A Radler-Pohl, R Zinck
1Kernforschungszentrum Karlsruhe, Institut für Genetik, Federal Republic of Germany.
Cell
|September 23, 1994
まとめ
短波長紫外線 (UVC) は,細胞プラズマ信号伝達を通じて,HeLa細胞内の転写因子や遺伝子を活性化させます. このUVC反応は成長因子受容体を巻き込み,その信号伝達経路を遮断することで抑制される.
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.
- 放射線生物学とは
背景:
- 短波長紫外線 (UVC) は,既知の細胞ストレス因子である.
- UVCに対する細胞の反応には,複雑な信号伝達経路が含まれています.
- AP-1やTCF/Elk-1のような転写因子は,遺伝子調節において重要な役割を果たしています.
研究 の 目的:
- 紫外線照射に対するヘラ細胞の反応の基礎となる分子機構を調査する.
- UVC誘発遺伝子活性化に関与するシグナル伝達経路と細胞成分を特定する.
- 成長因子受容体がUVCに対する細胞応答を媒介する役割を調査する.
主な方法:
- HeLa細胞をUVCで照射する.
- 転写因子活性化の分析 (AP-1,TCF/Elk-1).
- c-fosとc-jun.の遺伝子発現の評価について
- サイトプラズマ信号伝達経路 (Ras,Raf,MAPキナーゼ) の調査.
- 成長因子プレスティミュレーション,スラミン,および支配的陰性EGF受容体変異体を使用した抑制研究.
- 皮質成長因子 (EGF) 受容体チロシンリン酸化の分析.
主要な成果:
- UVC照射は,AP-1およびTCF/Elk-1転写因子の改変と活性化を誘導する.
- タンパク質合成から独立したc-fosとc-jun遺伝子の転写活性化は,UVC後に行われます.
- UVC反応は,Ras,Raf,Src,MAPキナーゼを含む細胞質シグナル伝達によって媒介される.
- UVC誘発のシグナル伝達は,ダウン調節成長因子受容体シグナル伝達,スラミン,または優位負のEGF受容体変異体によって抑制されます.
- UVC照射はEGF受容体の即時,スラミン抑制可能なチロシンリン酸化につながります.
結論:
- 成長因子受容体のシグナル伝達経路は,UVCに対する細胞応答を媒介する上で重要な役割を果たします.
- UVCは,成長因子受容体経路と相互接続している細胞プラズマ信号伝導カスケードを通じて作用します.
- EGF受容体は,UVC反応の重要な構成要素であり,照射時に迅速なチロシンリン酸化を受けます.
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