免疫性耐性 免疫性耐性とは グループ3の先天性リンパ性細胞は,共生細菌特異のCD4+T細胞の腸内選択を媒介する
Matthew R Hepworth1, Thomas C Fung2, Samuel H Masur3
1Jill Roberts Institute for Research in Inflammatory Bowel Disease, Joan and Sanford I. Weill Department of Medicine, Gastroenterology Division, and Department of Microbiology and Immunology, Weill Cornell Medical College, Cornell University, New York, NY, USA.
まとめ
グループ3の先天性リンパ性細胞 (ILC3s) は,腸内細菌に対するT細胞の反応を制御する. IBD患者におけるILC3sに対するMHCIIの減少は,腸内のT細胞選択を含む新しい疾患メカニズムを示唆しています.
科学分野:
- 免疫学 免疫学とは
- 胃腸内科 胃腸内科
- 微生物学 微生物学とは
背景:
- 炎症性CD4 (((+) T細胞反応は,自己免疫性および炎症性腸疾患 (IBD) を誘発する.
- 胸膜の選択は自己反応性T細胞を制限するが,共生細菌特有のT細胞の選択を制御するメカニズムは不明である.
- 生まれながらのリンパ性細胞 (ILC) は,腸内ホメオスタシスにとって極めて重要です.
研究 の 目的:
- 3群の先天性リンパ性細胞 (ILC3s) が,共生細菌特有のT細胞を調節する役割を調査する.
- ILC3の内在的なメジャー・ヒストコンパティビリティ・コンプレックスクラスII (MHCII) の発現がT細胞選択に影響するかどうかを判断する.
- 小児IBD患者における大腸のILC3sのMHCII発現を検査する.
主な方法:
- ILC3の内在的なMHCII発現制御の分析.
- MHCII (((+) ILC3sの活性化された共生細菌特異のT細胞における細胞死を誘発する能力の評価.
- 小児IBD患者および健康な対照群の結腸ILC3sにおけるMHCII発現の定量化.
主要な成果:
- ILC3の内在的なMHCII発現は,胸膜の上皮細胞と同様に調節されています.
- MHCII発現するILC3sは,活性化された共生細菌特異のT細胞で直接アポトーシスを誘発する.
- 小児性IBD患者の大腸のILC3sで,MHCII発現の減少が観察されました.
結論:
- ILC3s.によって媒介される,腸内のコンメンサル細菌特異のCD4 ((+)) T細胞のための新しい選択経路が定義されています.
- このILC3媒介のT細胞選択プロセスの失調は,ヒトIBDの病原化に寄与する可能性があります.
- ILC3機能をターゲットにすることは,IBDの潜在的な治療戦略です.
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