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調節性T細胞の機能は,弱体化されたFoxp3発現により,破壊され,変換されます
Yisong Y Wan1, Richard A Flavell
1Section of Immunobiology, Yale University School of Medicine, 300 Cedar Street, New Haven, Connecticut 06520, USA.
Nature
|January 16, 2007
まとめ
調節性T細胞 (T(r)) は自己耐性を制御し,その機能にはFoxp3が不可欠である. この研究は,Foxp3発現の減少がT (r) 細胞抑制を損なうことを示し,それらをエフェクタ細胞に変換することによって,自己免疫疾患につながる.
科学分野:
- 免疫学 免疫学とは
- 細胞生物学 細胞生物学
- 遺伝学 遺伝学とは
背景:
- 調節性T細胞 (T ((r)) は,自己耐性および免疫抑制の維持に不可欠です.
- Foxp3は,T (r) 細胞の発達と機能を制御する重要な転写因子です.
- Foxp3の発現の低下は免疫疾患と関連しており,バイナリオン/オフスイッチモデルに異議を唱えている.
研究 の 目的:
- Foxp3がT(r) 細胞機能を投与量依存的に調節するかどうかを調査する.
- 衰弱したFoxp3発現がT (r) 細胞機能と免疫ホメオスタシスに及ぼす影響を決定する.
- 自身免疫疾患の発症におけるFoxp3レベルの役割を明らかにする.
主な方法:
- T(r) 細胞における弱体化された内生的なFoxp3遺伝子発現を持つマウスモデルを生成した.
- 胸膜の発達,ホメオスタティックな膨張,そしてFoxp3-発現細胞の新たな生成を評価した.
- Foxp3.3を減少させたT細胞のインビトロおよびインビボで評価された免疫抑制活動およびアナーギー特性.
主要な成果:
- Foxp3の発現が減弱すると,胸膜の発達や新世代に影響を及ぼさず,攻撃的な自己免疫性シンドロームを引き起こす.
- T (r) 細胞の免疫抑制機能は廃止され,アナージック特性は維持された.
- Foxp3が低下したT細胞は,好ましくTヘルパー2 (T(h) 2) エフェクターに微分化し,自己免疫病理を誘発する.
結論:
- Foxp3は,T (r) 細胞機能を,非バイナリで,用量依存的に調節する.
- Foxp3発現の減少は,T (r) 細胞の抑制機能を低下させ,エフェクター細胞の分化を促進することによって,免疫疾患を引き起こす.
- これらの発見は,T (r) 細胞の調節とヒト免疫疾患の病因学についての洞察を提供します.
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