胎児の腸内のB細胞リンパ分裂を調整するストロマと免疫細胞との相互作用が保存される

Kimberly A Carroll¹, Weihong Gu², Long Phan²

¹Graduate School of Biomedical Sciences, Tufts University, Boston, United States of America.

JCI insight

|September 2, 2025

まとめ

小腸は胎児のB細胞発達の新しい部位です腸内の特殊な細胞と分子はこのプロセスをサポートし腸内の保存されたB細胞のニッチを明らかにします

科学分野:

免疫学
発達生物学
胃腸内科

背景:

最近の発見は,小腸 (SI) が胎児および新生児の生涯におけるB細胞リンパ分裂のための新しい場所であることを示唆しています.
SIにおけるB細胞の発達を可能にする特定の分子および細胞因子は,ほとんど不明のままである.

研究の目的:

胎児のマウスとヒトの腸におけるB細胞リンパ分裂を支える分子および細胞構造を調査する.
この新しい腸のB細胞ニッチの保存された特徴を解明するためです

主な方法:

単細胞RNAシーケンシング
インサイト免疫光
空間トランスクリプトミクス
高次元スペクトルフローサイトメトリ

主要な成果:

小腸内メゼンキーマ細胞とストロマ細胞は,一般的なリンパ性祖先を募集するキモキンを発現する.
SI内のリンパ内皮細胞は,IL7R+前駆体B細胞の近くでIL7とTSLPを発現し,分化を促進する.
胎児由来リンパ性組織誘導体 (LTi) 細胞は,リンパ性組織発育とは関係なく,B細胞発育とSI内の局所化に不可欠である.

結論:

ネズミとヒトの両方に保存された腸内B細胞ニッチが存在し,伝統的なリンパポエーシスモデルに挑戦しています.
胎児から派生したLTi細胞は,SI内のB細胞の発達において重要な役割を果たします.
この研究は,腸内の胎児のB細胞発育に必要な細胞および分子構造を特定し,長期的な免疫への貢献に関する将来の研究への道を開きます.

キーワード:

適応免疫開発免疫学

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