甲状腺リンパ球の成熟の可能性における発達的なスイッチは,血液形成性幹細胞のレベルで発生します
1Howard Hughes Medical Institute, Stanford University School of Medicine, California 94305.
Cell
|September 7, 1990
まとめ
胎児の血液形成性幹細胞 (HSC) は,成人のHSCとは異なり,胎児の胸腺に特定のT細胞を生成することができます. これは,HSCの発達の可能性が,年齢や環境によって変化することを示唆しています.
科学分野:
- 免疫学 免疫学とは
- 発達生物学 発達生物学について
- ヘマトポエシス (血球形成) とは
背景:
- 血液形成性幹細胞 (HSC) は,免疫システムの発達に不可欠です.
- HSCの差別化ポテンシャルは,その発達段階 (胎児と成人) とマイクロ環境によって異なる可能性があります.
研究 の 目的:
- 胎児および成人の血液形成性幹細胞 (HSC) が特定のT細胞集団に分化する能力を調査する.
- 胸膜の微環境がHSCの微分化可能性を影響するかどうかを判断する.
主な方法:
- マウスの胎児肝臓と成人骨髄のHSCの分離.
- 胎児の胸の葉のHSCsでインビトロ再定着.
- HSCのイントラティム注射を成人の胸腺にします.
- T細胞集団 (Vガンマ3+,ガンマデルタ+,アルファベータ+) を検出するためのフローサイトメトリー分析.
主要な成果:
- 胎児の肝臓HSCは,成人の骨髄HSCは含まないが,胎児の胸の葉にあるVガンマ3+T細胞を生成する.
- 単一の胎児のHSCは,多様なT細胞タイプ (Vガンマ3+,ガンマデルタ+,アルファベータ+) を生成することができる.
- HSC (胎児または成人) が成人の胸腺に導入されたとき,Vガンマ3+T細胞は検出されなかった.
結論:
- 胎児のHSCは,胎児の胸膜の微小環境の中でVガンマ3+T細胞に微分化するユニークな能力を有しています.
- HSCの発達の可能性は,年齢に依存し,胸のミクロ環境の影響を受けているようです.
- オントゲニーは,HSCの差別化能力を大幅に変化させる.
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