NF-kappaBによるgadd45β誘導は,プロアポプトティックJNKのシグナリングをダウンレギュレーションする
E De Smaele1, F Zazzeroni, S Papa
1The Gwen Knapp Center for Lupus and Immunology research, The University of Chicago, Illinois 60637, USA.
Nature
|November 20, 2001
まとめ
核因子-kappaB (NF-kappaB) 転写因子は,c-Junアミノ末端キナーゼ (JNK) 経路をダウンレギュレーションすることにより,細胞生存を促進します. このNF-kappaB媒介によるJNKシグナル伝達の阻害は,細胞死亡の制御に極めて重要です.
科学分野:
- 分子生物学は分子生物学である.
- 細胞生物学 細胞生物学
- 免疫学 免疫学とは
背景:
- 核因子-kappaB (NF-kappaB) の転写因子は,免疫反応,炎症,細胞生存を調節する.
- NF-kappaBの活性化は,TNF受容体の関与を含む様々なトリガーによって誘発されたアポトーシスをアンタゴニズします.
- NF-kappaBの抗アポプトシス作用は,がんにおいて有意であり,腫瘍形成と治療への抵抗に寄与する.
研究 の 目的:
- NF-kappaBの抗アポプトシス作用の背後にある分子メカニズムを解明する.
- NF-kappaBシグナル伝達とc-Junアミノ端末キナーゼ (JNK) 経路の間のリンクを確立するために.
- 細胞死経路の調節におけるNF-kappaBの役割を特定する.
主な方法:
- NF-kappaBとJNKのシグナリングカスケードの相互作用を調査した.
- ストレスとアポトーシスに関与する遺伝子の転写制御を分析した.
- TNF受容体シグナリングをモデルシステムとして利用し,細胞死亡を研究した.
主要な成果:
- NF-kappaB複合体がJNKカスケードをダウンレギュレーションすることを示した.
- Gadd45beta/Myd118を,JNKシグナル伝達を阻害する重要なNF-kappaBアップ調節遺伝子として特定しました.
- NF-kappaBに依存したJNKの阻害は,TNF-α誘発のアポトーシスを予防するために重要であることが示されました.
結論:
- NF-kappaBとJNK経路の間の直接的なリンクを確立し,新しい細胞保護機構を明らかにしました.
- プログラム細胞死制御におけるJNK信号伝達のNF-kappaB媒介抑制の重要性を強調した.
- 持続的なJNK活性化は,特にTNF-αシグナル伝達の文脈で,アポプトス反応に寄与することを示唆しています.
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