マイコバクテリアは,膜脂質の協調的な使用を通じて,マクロファージの募集を操作します
C J Cambier1, Kevin K Takaki2, Ryan P Larson3
1Department of Immunology, University of Washington, Seattle, Washington 98195, USA.
Nature
|December 17, 2013
まとめ
Mycobacterium tuberculosisは,容認性マクロファージを募集し,微生物を殺すマクロファージを避けるために特定の脂質を使用して宿主の防御を回避します. この免疫回避戦略は,結核の感染と生存に極めて重要です.
科学分野:
- 微生物学 微生物学とは
- 免疫学 免疫学とは
- 感染症 感染症は感染症です.
背景:
- マイコバクテリウム結核 (M. tuberculosis) の生存は,宿主への侵入,複製,そして感染に依存しています.
- M. tuberculosisは肺内のマクロファージに感染し,このマクロファージは細菌をより深い組織に輸送する.
- ミクロビキダルマクロファージの中でM. tuberculosisがどのように生き残るのかを理解することは,非常に重要です.
研究 の 目的:
- M. tuberculosisとM. marinumが微生物を殺すマクロファージを回避しながら,許容性のあるマクロファージを好ましく感染させるメカニズムを調査する.
- 宿主免疫細胞の徴募と機能を調節する特定の菌根菌脂質の役割を解明する.
主な方法:
- マウスとゼブラフィッシュのモデルで実験を行った.
- フィチオセロール5コセロセラート (PDIM) とフェノールグリコリピド (PGLs) を含む細胞表面関連脂質の分析.
- トール型受容体 (TLR) とケモカイン受容体2 (CCR2) のシグナル伝達経路の調査.
主要な成果:
- M. tuberculosisとM. marinumは,好ましく,微生物を殺すマクロファージを回避して,許容性のあるマクロファージを募集し,感染させます.
- PDIM脂質は,病原体に関連した分子パターン (PAMP) をマスクし,TLR依存の微生物破壊性マクロファージの徴募を防止します.
- PGLは,CCR2媒介経路を通じて容認的なマクロファージの徴募を促進する.
結論:
- PDIMとPGLの連携した役割は,M. tuberculosisの毒性と宿主の免疫相互作用で特定されています.
- これらの脂質は,M. tuberculosisが微生物を殺す免疫反応を回避し,下部呼吸道を好むことを説明する.
- 発見は,結核の病原性および宿主-病原体の相互作用に関する洞察を提供します.
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