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TWEAKは,先天性免疫から適応性免疫への移行を弱める
Heather Maecker1, Eugene Varfolomeev, Frank Kischkel
1Department of Molecular Oncology, Genentech, Inc., 1 DNA Way, South San Francisco, CA 94080, USA.
Cell
|December 6, 2005
まとめ
腫瘍死滅因子のような弱い誘発性アポトーシス (TWEAK) タンパク質は,先天的免疫を抑制し,自然殺菌 (NK) 細胞の活動とインターフェロン-ガンマ (IFN-γ) 生産を減少させます. このTWEAK機能は,適応性Tヘルパー1 (TH1) 免疫応答への移行を制限する.
科学分野:
- 免疫学 免疫学とは
- 分子生物学は分子生物学である.
- 感染症 感染症とは
背景:
- 生まれつきの免疫は,病原体に対する最初の防御を提供し,その後の適応免疫反応に影響を与えます.
- 生まれつきの免疫から適応免疫への移行は,宿主の防御における重要なプロセスです.
- 腫瘍死滅因子アルファ (TNF-alpha) は,免疫反応の重要な媒介体である.
研究 の 目的:
- 生まれながらの免疫応答の調節におけるTWEAK (TNFのような弱体誘発性アポトーシス) の役割を調査する.
- TWEAKが先天性免疫から適応性免疫への移行にどのように影響するかを決定する.
- TWEAKがサイトカインの産生と免疫細胞の活動を調節する分子メカニズムを解明する.
主な方法:
- TWEAKノックアウト (TWEAK-/-) マウスを利用して,先天性および適応性免疫反応を研究した.
- 天然キラー (NK) 細胞とTヘルパー1 (TH1) 細胞を含む免疫細胞集団を評価した.
- サイトカインの産生 (インターフェロン-ガンマ[IFN-γ]とインタールイキン-12[IL-12]) を測定し,STAT-1とNF-kappaBを含む分子経路を分析した.
主要な成果:
- TWEAK-/-マウスはNK細胞の増加と細菌内毒素に対する過敏性,IFN-γとIL-12の産生の増加を示した.
- TWEAKはSTAT-1の活性化を阻害し,p65 NF-kappaBとヒストンデセチラーゼ1の結合を促進し,サイトカイン合成を抑制しました.
- TWEAK-/-マウスは,臓の拡大,TH1細胞の拡張,および腫瘍への挑戦に対するTH1媒介反応の強化を示した.
結論:
- TWEAKはIFN-γとIL-12の産生を抑制し,先天的な免疫反応を抑制する.
- TWEAKは,先天的免疫から適応的TH1免疫への移行を制限する.
- TWEAKの欠如は,先天的および適応的TH1免疫反応を高め,宿主の防御と抗腫瘍免疫に影響を及ぼします.
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