ミトコンドリア代謝の異なるモードは,T細胞の差別化と機能を分離する
Will Bailis1,2, Justin A Shyer1, Jun Zhao1,3,4
1Department of Immunobiology, Yale School of Medicine, New Haven, CT, USA.
Nature
|June 21, 2019
まとめ
Tヘルパー1 (TH1) 細胞の異なるミトコンドリア代謝モードは,エフェクタ機能からの分化を解除する. 複合体Iは増殖と表遺伝的変化をサポートし,複合体IIは代謝を変化させることでエフェクター機能を駆動する.
科学分野:
- 免疫学
- 細胞生物学
- 代謝生物学
背景:
- 活性化されたCD4T細胞は,増殖,表遺伝子改造,およびエフェクタ機能のための代謝再プログラムを受けます.
- T細胞の活性化には,T細胞受容体結合,共刺激信号,およびサイトカインが含まれており,バイオマス生成および増殖のためのグリコールプログラムが誘発されます.
- 信号伝達と転写再構成はT細胞の分化と機能を調整するが,細胞生化学組成の役割は不明である.
研究 の 目的:
- 異なるミトコンドリアの代謝経路がTヘルパー1 (TH1) 細胞の分化とエフェクター機能を独立して調節するかどうかを調査する.
- ミトコンドリアの代謝がT細胞の増殖,表遺伝的変化,および末端エフェクタ機能に影響を与える生化学的メカニズムを解明する.
主な方法:
- ネズミのTヘルパー1 (TH1) 細胞における遺伝子操作,薬理学的介入,およびメタボロミクス分析の組み合わせを用いた.
- 特定のミトコンドリア複合体 (複合体I,複合体II),マラ酸アスパルテートシャトル,およびミトコンドリアシトラート輸出の役割を調査した.
- T細胞増殖,ヒストンのアセチル化,遺伝子発現,エフェクタ機能に対する評価された影響.
主要な成果:
- 異なるミトコンドリアの代謝経路は,TH1細胞の微分化を生化学的に分離する.
- トリカルボキシル酸の循環は,サクシネート脱水素酵素 (複合体II) を介して,TH1エフェクターの機能に不可欠であるが,増殖とヒストンのアセチル化を抑制する.
- 複合体I,マラート-アスパラテートシャトル,およびミトコンドリアのシトラート輸出は,アスパラテート合成を維持することにより,T細胞の増殖とヒストンのアセチル化に不可欠である.
結論:
- ミトコンドリアの代謝はT細胞の活性化において重要な二重の役割を果たし,異なる経路が異なる細胞プロセスをサポートする.
- マラート-アスパルテートシャトル,ミトコンドリアのシトラート輸出,およびコンプレックスIは早期のT細胞増殖と表遺伝子改造のための基質を提供します.
- 複合体IIは,これらの基質を消費することによって,分化を阻害し,細胞状態を強制するトランスクリプションのプログラムとともに,平行な生化学ネットワークを強調します.
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