CARは小腸におけるT細胞の胆酸への適応を誘導する
Mei Lan Chen1,2, Xiangsheng Huang3, Hongtao Wang3
1Department of Immunology and Microbiology, The Scripps Research Institute, Jupiter, FL, USA.
Nature
|April 8, 2021
まとめ
核受容体CARは,MDR1の発現を調節することにより,小腸の免疫細胞を胆酸の毒性から保護する. この発見は,クローン病と関連する小腸炎症の治療に新しい戦略を提供します.
科学分野:
- 免疫学
- 胃腸内科
- 分子生物学
背景:
- 消化に不可欠な胆酸は,小腸に毒性や炎症を引き起こす可能性があります.
- 肝細胞は胆酸恒常化を管理するが,小腸の免疫細胞の耐性メカニズムは不明である.
- 小腸のCD4+Tエフェクター細胞はMDR1を調節し,胆酸の毒性を防止し,炎症を抑制する.
研究 の 目的:
- 小腸内膜内のT細胞におけるMDR1発現のレギュレータを特定する.
- 胆酸に対するT細胞反応における核異種生物受容体 CAR (構成性アンドロスタンの受容体) の役割を調査する.
- 小腸炎の治療対象として CARの可能性を調査する.
主な方法:
- マウスの小腸内膜に侵入するT細胞におけるCARの役割について研究した.
- CARの活性化時にT細胞の転写変化を分析した.
- CARの機能を in vivoで評価するために,T細胞で再構成されたRag1-/-またはRag2-/-のマウスを使用した.
- 胆酸誘発性乳房炎に対する薬学的なCAR活性化の効果を調べた.
主要な成果:
- CARの活性化により,小腸内膜のTエフェクタ細胞が再プログラムされ, 解毒トランスポーターとIL-10が誘発される.
- T細胞のCAR欠乏は胆酸誘発性イレイン炎を悪化させた.
- 薬学的なCAR活性化により,小腸内の胆酸による炎症が抑制されました.
- CARはT細胞に局所的に作用し,胆汁酸を排毒し,炎症を軽減します.
結論:
- 核受容体CARは小腸のT細胞におけるMDR1発現の重要な調節体であり,胆酸の毒性から保護する.
- T細胞のCAR活性化により 解毒が促進され 炎症が解消され 小腸クローン病の新たな治療策が提供されます
- この研究は,小腸内のリンパ球の特異化を強調し,潜在的な治療目標としてCARを特定しています.
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