粘膜や全身の微生物群は,B細胞のレパートリーを形成する
Hai Li1, Julien P Limenitakis1, Victor Greiff2
1Maurice Müller Laboratories (DBMR), Universitätsklinik für Viszerale Chirurgie und Medizin Inselspital, University of Bern, Bern, Switzerland.
Nature
|August 8, 2020
まとめ
微生物群はB細胞の反応と免疫グロブリンレパートリーを形作る. 組織的な微生物の暴露はIgG応答を多様化し,粘膜の暴露はIgA応答を制限し,独特の免疫適応を強調する.
科学分野:
- 免疫学
- 微生物群の研究
- システム生物学
背景:
- 微生物群の植民はB細胞と免疫グロブリン生産を刺激する.
- 哺乳類は,多様な微生物の植民により,複雑で個別化された免疫グロブリンレパートリーを示しています.
- 微生物群がB細胞集団と その反応性をどう形作るのかを理解することは 極めて重要です
研究 の 目的:
- 定義された微生物被曝がB細胞プールと免疫グロブリンレパートリーをどのように形作るか解明する.
- 粘膜と全身の微生物の接触によって生じる 独特の免疫反応を調査する.
- 微生物刺激に対する免疫グロブリンレパートリーの発達と特性を分析する.
主な方法:
- 病原菌のないマウスの定義された一時的な微生物被曝の簡素化されたモデルを使用した.
- B細胞集団と単細胞の免疫グロブリンレパートリーを分析するために深層配列化を使用した.
- 腸内粘膜と静脈内全身微生物被曝後の免疫反応の比較
主要な成果:
- 腸内粘膜における微生物の曝露は,細菌のない対照群とは異なるオリゴクローナル反応を誘発した.
- 静脈内での全身的暴露により,様々な免疫グロブリンが生成された.
- 組織的曝露は,IgGのレパートリーを微生物の抗原に拡張し,粘膜曝露はIgAのレパートリーを制限し,特異性を損なった.
結論:
- 微生物への曝露は,B細胞,特に記憶細胞とプラズマ細胞で特徴的な免疫グロブリン重鎖レパートリーを誘発する.
- 組織的微生物被曝は,粘膜被曝による制限されたIgAレパートリーと対照的に,柔軟で多様なIgGレパートリーを促進します.
- これらの発見は,宿主-微生物の免疫ダイナミクスを明らかにし,全身的曝露は広範な防御を好み,粘膜曝露は宿主-微生物の相互性を反映しています.
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