TNFαα誘発のアポプトシスには,JNK依存の経路が必要である
Yibin Deng1, Xiaoyang Ren, Lin Yang
1Huffington Center on Aging and Department of Molecular and Cellular Biology, Baylor College of Medicine, Houston, TX 70030, USA.
Cell
|October 9, 2003
まとめ
腫瘍死滅因子 (TNFalpha) 信号はJNKを活性化させ,JNKは Bid. これはSmac/DIABLOを放出し,抑制を緩和し,アポトーシスのためのカスパース8の活性化を可能にします.
科学分野:
- 細胞の信号伝達経路は,
- アポトーシスと細胞死亡のメカニズム
- TNFアルファ信号伝達の分子生物学
背景:
- 腫瘍死滅因子α (TNFalpha) 受容体のシグナル伝達により,カスパース8,NF-kappaB,JNKを含む複数の下流エフェクターが活性化されます.
- カスパース8はTNFアルファ誘発のアポトーシスに不可欠であり,NF-カッパBは細胞死を抑制しますが,この経路におけるJNKの役割は不明です.
研究 の 目的:
- TNFアルファ媒介アポトーシスにおけるJNK活性化の正確な機能を解明する.
- JNKの活性化とカスパース8分裂と細胞死亡を結びつける連続的な経路を定義する.
主な方法:
- 分子生物学技術を用いてTNFalphaシグナル伝達におけるJNK,Bid,Smac/DIABLOの役割を調査した.
- カスパース8分裂,ビッド分裂産物生成 (jBid),およびミトコンドリアのタンパク質放出を分析した.
- Smac/DIABLO.によるTRAF2-cIAP1複合体の破壊を調査しました.
主要な成果:
- TNFアルファ媒介アポトシスには,JNK,Bid,Smac/DIABLOを含む連続的な経路が必要です.
- JNKの活性化により,Bidのカスパーゼ8の独立した割れが起こり,jBidが生成されます.
- jBidがミトコンドリアに転移すると,Smac/DIABLOが放出され,TRAF2-cIAP1複合体が破壊されます.
結論:
- JNK経路は,TRAF2-cIAP1媒介によるカスパース8活性化およびアポトーシスの抑制を緩和するために不可欠です.
- この研究は,内在的および外在的細胞死経路間のクロストークの新しいメカニズムを明らかにしています.
- 発見は,TNFalpha誘発細胞死の調節に関する新しい洞察を提供します.
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