TNF受容体1関連タンパク質TRADDは,細胞死とNF-kappa B活性化をシグナルする
1Tularik, Incorporated, South San Francisco, California 94080, USA.
Cell
|May 19, 1995
まとめ
研究者らは,TNF受容体1 (TNFR1) と相互作用するタンパク質であるTRADDを発見した. TRADDは,腫瘍死滅因子 (TNF) 誘発のアポトーシスとNF-kappa Bの活性化を誘発し,異なるシグナル伝達経路を明らかにします.
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,TNF受容体1 (TNFR1) を介して多様な細胞反応を誘発する.
- TNFR1の下流にある細胞内信号伝達機構を理解することは,TNF媒介の生物学的結果を解読する上で極めて重要です.
- プログラム細胞死と炎症反応は,TNF誘発の主要な経路である.
研究 の 目的:
- TNFR1シグナル伝達に関与する新しいタンパク質を特定する.
- 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の役割を明らかにする.
- 細胞死とNF-kappa Bの活性化を制御するシグナル伝達経路をTNFR1.1.の下流で区別する.
主な方法:
- TNFR1.1.へのTRADD結合を特定するためのタンパク質相互作用の研究.
- 機能的影響を評価するために,TRADDとそのC端末ドメインの過剰表現.
- インタールイキン-1β変換酵素の阻害体であるcrmA遺伝子を活用して,信号伝達経路を調査する.
主要な成果:
- 新しい34 kDaのタンパク質であるTRADDが特定され,TNFR1.1の細胞内死亡領域に特異的に結合しています.
- TRADDの過剰発現は,TNF媒介によるアポトーシスとNF-カッパB活性化の両方を誘発した.
- TRADDのC端118アミノ酸は,TNFR1の相互作用と両方の細胞応答の誘導に十分であった.
- TRADD誘発のアポトーシスはcrmAによって抑制され,NF-kappa Bの活性化は抑制されず,異なる経路を示しています.
結論:
- TRADDは,TNFR1シグナル伝達の重要な媒介であり,受容体をアポプトティック経路とNF-カッパB経路の両方に結びつける.
- TNF誘発プログラム細胞死とNF-kappa B活性化のためのシグナリングカスケードは,TRADDの下流で分岐する.
- TRADDは,TNF刺激への反応として細胞の運命を決定する重要な分子スイッチを表しています.
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