TRADD-TRAF2とTRADD-FADDの相互作用は,TNF受容体1の2つの異なる信号伝達経路を定義しています
Cell
|January 26, 1996
まとめ
腫瘍死滅因子 (TNF) は,TNF受容体1 (TNFR1) とTRADDを通じた経路を活性化します. TRADDは,NF-kappa Bの活性化のためにTRAF2と相互作用し,アポトーシスのためにFADDと相互作用し,経路の分岐を示しています.
科学分野:
- 分子生物学は分子生物学である.
- 細胞シグナル伝達 細胞信号伝達
- 免疫学 免疫学とは
背景:
- 腫瘍死滅因子 (TNF) は,アポトーシスや炎症を含む細胞過程を調節する重要なサイトカインです.
- TNFは,TNF受容体1 (TNFR1) を介してその効果を発揮し,複雑な細胞内シグナリングカスケードを開始します.
- TRADDは,TNFR1のダウンストリームで重要なアダプタータンパク質として作用し,異なるシグナル伝達経路の活性化を媒介する.
研究 の 目的:
- TNF誘発のアポトーシスとNF-カッパB活性化を媒介するTRADDの特定の役割を解明する.
- これらの別々の経路を活性化するために,TRADDと相互作用する下流のシグナル伝達分子を特定するために.
- TNFR1シグナリングカスケードの分岐点を調査する.
主な方法:
- コイムノプレシピテーションは,直接のタンパク質対タンパク質の相互作用を証明する測定法です.
- TRAF2とFADDの支配的陰性変異体の発現は,信号伝達経路を解剖する.
- TNF刺激への反応としてNF-kappa B活性化とアポトーシス誘発の評価.
主要な成果:
- TRADDは,キー信号トランスデューサーであるTRAF2とFADDの両方と直接相互作用します.
- 支配的ネガティブなTRAF2変異体がTNF媒介のNF-カッパB活性化を抑制したが,アポトーシスを抑制しなかった.
- 支配的ネガティブなFADD変異体がTNF誘発のアポトーシスを抑制したが,NF-カッパBの活性化を抑制しなかった.
結論:
- TNFR1シグナル伝達経路はTRADDで分岐し, NF-kappa Bの活性化とアポトーシスを媒介する明確な下流の相互作用がある.
- TRAF2は,TRADDの下流のNF-kappa B活性化カスケードに特に関与しています.
- FADDは,TRADDの下流のアポトーシス誘導カスケードに特に関与しています.
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