訓練された ILC3 反応は腸の防御を促進する
Nicolas Serafini1, Angélique Jarade1, Laura Surace1
1Institut Pasteur, Université de Paris, Inserm U1223, Innate Immunity Unit, Paris, France.
まとめ
グループ3の先天性リンパ球 (ILC3s) は,感染後に永続的な記憶を発達させる. これらの訓練されたILC3は,将来の病原体への防御力を高めます.
科学分野:
- 免疫学
- 生まれつきの免疫
- 細胞免疫学
背景:
- グループ3の先天性リンパ球 (ILC3) は,宿主の防御,特に粘膜表面に関与する重要な先天性免疫細胞です.
- 病原体への曝露後のILC3sの長期的な機能的可塑性は,ほとんど特徴づけられていない.
研究 の 目的:
- 腸内 ILC3 が腸内細菌病原体と接触した後に安定した機能的変化があるかどうかを調べる.
- これらの改変されたILC3が,次の病原体への反応を高めるかどうかを判断する.
主な方法:
- ネズミにCitrobacter rodentiumというエンテロバクテリアを投与し,時間限定の感染を誘発した.
- 腸内 ILC3 群は,感染後の長期間にわたる表型および機能的変化を分析した.
- ILC3sの反応を評価するため,リチャレンジ実験を実施した.
主要な成果:
- *C. rodentium* 感染後も数ヶ月間,腸内 ILC3 が活性化していた.
- 再挑戦すると,これらの"訓練された"ILC3は,インタールイキン22 (IL-22) の増殖と増産を示した.
- 訓練されたILC3は,代謝と増殖能力の強化に関連して,素朴なILC3と比較して,感染を制御する優れた能力を示しました.
結論:
- *Citrobacter rodentium*への限られた曝露は,腸内 ILC3 の持続的な現象的および機能的適応を誘発する.
- これらのILC3の適応的変化は,長期間続く粘膜免疫と宿主防御の強化に寄与する.
- この研究は,ILC3sによって媒介される先天的な免疫システム内の免疫学的記憶の形態を明らかにしています.
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