mTORC1は免疫信号と代謝プログラミングを組み合わせて,T ((reg)) 細胞の機能を確立します
Hu Zeng1, Kai Yang, Caryn Cloer
1Department of Immunology, St Jude Children's Research Hospital, Memphis, Tennessee 38105, USA.
Nature
|July 2, 2013
まとめ
ラパミシン複合体1 (mTORC1) 信号伝達のメカニスティックターゲットは,T細胞 (Treg) 機能の調節に極めて重要です. mTORC1を阻害すると,Treg抑制活性が低下し,マウスでは致命的な炎症を引き起こします.
科学分野:
- 免疫学 免疫学とは
- 細胞の代謝について
- 分子生物学は分子生物学である.
背景:
- ラパミシン (mTOR) 経路のメカニスティックターゲットは,免疫および代謝信号を統合してT細胞の分化と機能を調節します.
- mTORシグナル伝達は,エフェクターCD4+T細胞とT細胞の分化に影響するが,T細胞の恒常性および機能におけるmTORシグナル伝達の役割はあまり理解されていない.
研究 の 目的:
- mTOR複合体1 (mTORC1) のシグナル伝達が,調節性T細胞の機能とホメオスタシスに果たす役割を調査する.
主な方法:
- マウスのラプター細胞のTreg特異的なデリレーションを活用し,mTORC1の信号伝達を妨害した.
- 評価されたT ((reg) 細胞抑制活動,増殖,および代謝経路.
- Foxp3,CTLA4,ICOSなどの重要な分子の発現を分析した.
主要な成果:
- Treg細胞は,T細胞受容体 (TCR) とIL-2信号によって誘発されるナイブT細胞よりも高い安定状態mTORC1活性を示します.
- TregsにおけるmTORC1の破壊は,抑制機能の喪失と致死性炎症疾患につながった.
- mTORC1のシグナリングは,Foxp3レベルとは関係なく,メバロナート経路経由でTregの増殖とCTLA4/ICOSの発現を促進します.
結論:
- mTORC1は,TCR/IL-2信号を代謝経路と結びつけ,Treg細胞機能の重要な陽性調節体である.
- mTORC1のシグナル伝達は,Treg抑制活性をプログラムすることによって,免疫ホメオスタシスと耐性を維持するために不可欠です.
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