組織に定着するマクロファージは,黄膜から派生したエリトロミエロイドの祖先から発生します
Elisa Gomez Perdiguero1, Kay Klapproth2, Christian Schulz1
1Centre for Molecular and Cellular Biology of Inflammation (CMCBI), King's College London, London SE1 1UL, UK.
Nature
|December 4, 2014
まとめ
大人の組織に居住するマクロファージのほとんどは,成人の造血性幹細胞 (HSC) ではなく,卵黄袋の赤血球性ミエロイド原始細胞 (EMP) から発生します. これらのEMPは,開発初期にクッファー細胞やマイクログリアのような主要なマクロファージ集団を確立します.
科学分野:
- 免疫学 免疫学とは
- 発達生物学 発達生物学とは
- ヘマトポエーシス (血液形成) とは
背景:
- 成人型造血幹細胞 (HSC) は,ほとんどの血液細胞の主要な源である.
- 成人組織における組織在住マクロファージは,HSCから独立して自己維持することができる.
- 成人組織マクロファージの正確な起源と発達経路は,まだ完全に理解されていません.
研究 の 目的:
- 成人組織に居住するマクロファージの起源を解明する.
- HSCと非HSCの祖先の相対的な貢献を決定する.
- マクロファージ集団の発達軌道を in vivoで特徴づけるために.
主な方法:
- マウスでの運命マッピングの実験.
- Tie2(+) エリトロミエロイド原始体 (EMP) の分析.
- 胚の発達中のCsf1r (((+)) 祖先集団の追跡.
主要な成果:
- 肝臓,脳,表皮,肺の成人のマクロファージの大部分は,HSCではなく,卵黄袋EMPから派生しています.
- EMPはHSCと異なるもので,胚の8.5.5日目に卵の黄袋で発生する.
- これらのEMPは胎児の肝臓を植民地化し,胎児のマクロファージ,赤血球,粒細胞,単細胞を発生させます.
結論:
- 黄膜袋のEMPは,ほとんどの成体組織に居住するマクロファージの主要な源である.
- 血形成の連続的な波が胎児の肝臓で発生し,EMPに続いてHSCが発生します.
- 組織マクロファージは,他の骨髄性細胞とは異なり,主にEMPによって確立され,成人期にはHSCによって限られた代替を示します.
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