TNF受容体1エフェクター機能の解剖:JNKの活性化はアポトーシスと関連していないが,NF-kappaBの活性化は細胞死亡を防ぐ
1Department of Pharmacology, School of Medicine, University of California, San Diego, La Jolla 92093-0636, USA.
Cell
|November 1, 1996
まとめ
腫瘍死滅因子受容体1 (TNFR1) は,異なる細胞経路を誘発する. 腫瘍死滅因子 (TNF) 信号は,RIP/TRAF2経由でJNKとNF-kappaBを活性化し,FADDはアポトーシスを媒介し,NF-kappaBはTNF誘発死から細胞を保護する.
科学分野:
- 細胞生物学 細胞生物学
- 分子シグナル伝達です.
- 免疫学 免疫学とは
背景:
- サイトカイン腫瘍死滅因子 (TNF) は,その1型受容体 (TNFR1) を通じて多様な生物学的効果を発揮する.
- TNFR1の活性化は,炎症,細胞死 (アポプトシス),増殖,分化を引き起こすことが知られている.
- TNFR1の下流の異なるシグナル伝達経路を理解することは,その複雑な役割を解読するために極めて重要です.
研究 の 目的:
- TNFR1がJNK,NF-kappaB,アポトーシスといった主要な下流効果因子を活性化する特定の分子機構を調査する.
- これらの異なる細胞反応を媒介する異なる信号トランスデューサーの役割を解明する.
- JNKの活性化,NF-kappaBの活性化,およびTNF誘発のアポトーシスの相互作用を決定する.
主な方法:
- TNFR1複合体への信号トランスデューサーの採用を分析するために分子生物学技術を活用しました.
- ダウンストリームシグナル伝達におけるFADD,RIP,TRAF2の役割を調査した.
- JNKとNF-kappaB経路の活性化を評価した.
- これらの経路がTNF誘発のアポトーシスに与える影響を評価した.
主要な成果:
- アポトーシスは,JNKとNF-kappaBの活性化とは独立したTNFR1複合体へのFADDの徴募によって媒介されます.
- JNKとNF-kappaBの両方の活性化は,RIPとTRAF2によって媒介されるが,TRAF2.0の下流で分岐する.
- TNF誘発のアポトーシスでは,JNKの活性化は必要ありません.
- NF-kappaBの活性化により,TNF誘発のアポトーシスから保護されます.
結論:
- TNFR1は,アポトーシス,JNK,NF-kappaB.B.のための明確なシグナル伝達経路を活性化します.
- FADDは特にアポプトシス経路に関与しているが,RIPとTRAF2はJNKとNF-kappaBの活性化に中心的な役割を果たしている.
- NF-kappaBシグナル伝達は生存経路として作用し,TNF誘発の細胞死に対抗するが,JNKはアポトーシスの誘発に関与しない.
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