母親の炎症は胎児の緊急骨格形成を調節する
Amélie Collins1, James W Swann2, Melissa A Proven2
1Columbia Stem Cell Initiative, Columbia University Irving Medical Center, New York, NY 10032, USA; Division of Neonatology-Perinatology, Department of Pediatrics, Columbia University Irving Medical Center, New York, NY 10032, USA.
Cell
|March 1, 2024
まとめ
新生児は感染に弱い. IL-10のような 母親の抗炎症因子は 胎児の幹細胞が免疫反応を起こすのを防ぎ 妊娠中の感染リスクを高めます
科学分野:
- 免疫学
- 発達生物学
- ヘマトポエシス
背景:
- 新生児は 炎症や感染症に敏感性があります
- 胎児の造血幹細胞と原始細胞 (HSPC) は免疫発達に不可欠ですが,炎症信号に対するその反応は完全に理解されていません.
- 低中性粒子の数は新生児の感染リスクを高めます
研究 の 目的:
- 晚期胎児肝 (FL) のマウスHSPCの炎症への反応を調査する.
- 緊急性骨髄形成の障害が 生後中性不全を引き起こすという仮説を検証する.
- 炎症に対する胎児のHSPC反応に影響を与える母親の要因を特定する.
主な方法:
- 胎児肝臓 (FL) のマウスの造血幹細胞と原始細胞 (HSPC) の分析
- 胎児のHSPCにおける骨髄細胞生成と転写プログラムの評価
- 炎症刺激で胎児のHSPCをインビトロ刺激する.
- 母親の抗炎症因子,特にインタールイキン-10 (IL-10) の調査.
- 胎児のHSPC活性化と生存を評価する母性IL-10ノックアウトマウスモデル.
主要な成果:
- 胎児のHSPCは安定状態で限られた骨髄細胞の産生を示し,成人のようなEM転写プログラムを活性化しません.
- 胎児のHSPCは,in vitroでEM誘発刺激に反応することができる.
- 母親のIL-10は胎児のEM経路のHSPC活性化を制限する.
- 母親のIL-10の喪失は胎児のHSPCのEM活性化を回復しますが,胎児の死亡につながります.
結論:
- 母親の抗炎症反応,主にIL-10は,胎児のEM経路を抑制することで妊娠を維持します.
- この抑制により,胎児のHSPCは感染信号に反応しなくなり,新生児の感受性を高めます.
- 妊娠と胎児の免疫反応の間には 進化のトレードオフがあります
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