TNFに対するヒト上皮細胞の反応には,誘導可能な自己決定性カスケードが含まれています
Kevin A Janes1, Suzanne Gaudet, John G Albeck
1Center for Cell Decision Processes, Massachusetts Institute of Technology, 77 Massachusetts Avenue, Cambridge, MA 02139, USA.
Cell
|March 28, 2006
まとめ
腫瘍死滅因子 (TNF) は,細胞死と生存信号の両方を誘発する. この研究は,TNFが信号の"オトクリンカスケード"を開始し,複雑なクロストークを通じて細胞の運命を影響することを明らかにしています.
科学分野:
- 細胞生物学 細胞生物学
- 分子シグナル伝達です.
背景:
- 腫瘍死滅因子 (TNF) は,アポトーシスにおける二重の役割を持つ炎症性サイトカインです.
- TNF受容体 (TNFR) 信号伝達経路の間の交響を理解することは,細胞の運命を決定するために極めて重要です.
- 敵対的なプロおよびアンチアポプトシス信号間のクロストークのメカニズムは,ほとんど不明のままです.
研究 の 目的:
- 人間の上皮細胞におけるプロデアトTNFとプロサバイバル成長因子シグナル伝達との交信を調査する.
- TNFによって開始される間接的なシグナル伝達経路を解明する.
主な方法:
- 実験的および計算的分析.
- 分類者ベースの回帰の適用.
- ~8000個の細胞内タンパク質の測定を伴うサイトカインシグナル伝達コンペンドムの分析.
主要な成果:
- TNFは,活性化されたTNFR経由で直接的な応答と間接的な応答の両方を誘発します.
- 間接的な反応には,トランスフォーミング成長因子アルファ (TGF-alpha),インタールイキン-1アルファ (IL-1alpha),およびIL-1受容体アンタゴニスト (IL-1ra) の連続的な放出が含まれます.
- TNFによって誘発される細胞外信号のこの臨時的,時間的に変動するシリーズは"自己決定カスケード"と呼ばれています.
結論:
- TNF誘発のオトクリンカスケードは,シナギスティック・シグナリング回路とアンタゴニスティック・シグナリング回路の複雑な交響を伴う.
- このクロスストークは,細胞の反応と地元のマイクロ環境を結びつける.
- これらのオトクリンカスケードに関するさらなる研究は,炎症信号に対する細胞反応の洞察を提供することができます.
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