調節性T細胞のAIM2は,自己免疫疾患を抑制する
Wei-Chun Chou1,2, Zengli Guo1,3, Hao Guo1,2
1Lineberger Comprehensive Cancer Center, University of North Carolina at Chapel Hill, Chapel Hill, NC, USA.
Nature
|January 28, 2021
まとめ
炎症ホルモンの受容体AIM2は,炎症ホルモンの機能とは無関係にT調節細胞で新しい役割を果たします. AIM2は免疫代謝とシグナル伝達経路を調節し,自己免疫を抑制することで,T調節細胞を安定させる.
科学分野:
- 免疫学
- 細胞生物学
- メタボリズム
背景:
- NLRP3を含む炎症ゾームは,骨髄細胞におけるカスパース-1とピロプトーシスを活性化し,炎症と自己免疫を誘発する.
- DNA結合性炎症体受容体AIM2は,主に骨髄細胞炎症体活性化における役割で知られている.
- T調節細胞 (Treg) は免疫ホメオスタシスと自己免疫の予防に不可欠です.
研究 の 目的:
- AIM2がT細胞の機能を調節する役割を調査する.
- AIM2がT調節細胞で炎症体独立機能を持っているかどうかを判断する.
- AIM2がT細胞の安定性と免疫反応に影響を与えるメカニズムを解明する.
主な方法:
- AIM2がT細胞のシグナル伝達経路と代謝に与える影響を評価するためのRNAシーケンシングと生化学分析.
- 人間とマウスのT細胞の転写因子によるAIM2発現と調節の分析.
- 炎症中のT細胞の安定性におけるAIM2の役割を評価するための系統追跡研究.
主要な成果:
- AIM2はT調節細胞で高濃度でTGFβによって誘発され,T調節細胞の重要な転写因子によって調節される.
- AIM2はAKTのリン酸化,mTORとMYCのシグナル伝達,および糖分解を弱め,同時にT細胞の脂質酸化リン酸化を促進する.
- AIM2はRACK1- PP2A複合体と相互作用し,AKTのリン酸化を抑制し,それによって炎症中のT細胞の安定性を高めます.
結論:
- AIM2は,T細胞の調節機能において,T細胞内在的および炎症体独立の重要な役割を果たします.
- AIM2は,AKT- mTORの信号伝達を調節し,免疫代謝を変化させ,T細胞の安定性を促進することで,自己免疫を抑制する.
- これらの発見は,先天的免疫における既知の役割とは異なる,適応性免疫におけるAIM2の新しい機能を明らかにしています.
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