アセタートは,共生細菌に対するIgA反応性を差異的に調節する
Tadashi Takeuchi1,2, Eiji Miyauchi1, Takashi Kanaya1,3
1Laboratory for Intestinal Ecosystem, RIKEN Center for Integrative Medical Sciences, Kanagawa, Japan.
Nature
|July 15, 2021
まとめ
腸内微生物のメタボリートアセテートは,免疫グロブリンA (IgA) の生成を促進し,腸内細菌のような特定の腸内細菌との結合を誘導し,粘膜の恒常性を維持する.
科学分野:
- 微生物学
- 免疫学
- 胃腸内科
背景:
- 腸内ホメオスタシスは バクテリアの植民と封じ込めのバランスを取ります
- 免疫グロブリンA (IgA) は,粘膜の免疫防御に不可欠です.
- 腸内微生物代謝物のIgAレパートリーへの影響は不明である.
研究 の 目的:
- 腸内微生物の代謝物が共生反応性IgAプールを形成する方法を調査する.
- アセテートがIgAの生成と結合特異性に与える影響を決定する.
- アセテートが粘膜免疫に影響を与えるメカニズムを解明する.
主な方法:
- 特定のバクテリアのコロニー化があるマウスモデル (Escherichia coli, Bacteroides thetaiotaomicron).
- IgAの生成とレパートリーの変化の分析
- 免疫細胞の相互作用とバクテリアの局所化の調査.
主要な成果:
- アセタートは結腸におけるIgAの産生を著しく増加させる.
- アセタートはIgA結合能力を変化させ,Enterobacteralesに対する選択性を示します.
- アセタートは上皮細胞と免疫細胞の相互作用を調節し,CD4 T細胞の反応に影響を与えます.
- アセテットに対する反応として,IgAレパートリーと細菌の局所化の変化が観察されました.
結論:
- アセテートなどの腸内微生物代謝物は,IgAの産生を制御する役割を果たします.
- アセタートは異なったIgA結合を促進し,選択的な微生物抑制に寄与する.
- このメカニズムは腸内粘膜のホメオスタシスの維持に不可欠です.
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