早期的造血细胞祖先的多样化和可遗传的血统印记
Shalin H Naik1, Leïla Perié, Erwin Swart
1Division of Immunology, The Netherlands Cancer Institute, 1066 CX Amsterdam, The Netherlands. naik.s@wehi.edu.au
Nature
|April 5, 2013
概括
造血干细胞 (HSC) 和淋巴原始多能原始细胞 (LMPP) 在体内表现出不同的命运. 细胞条形码显示,血统印记发生的时间比以前想象的要早,支持了血液形成的分级承诺模型.
科学领域:
- 血液形成 血液形成 血液形成
- 干细胞生物学 干细胞生物学
- 免疫学 免疫学 免疫学
背景情况:
- 血造干细胞 (HSC) 和它们的祖先的血细胞生产的精确机制和动力学仍在争论中.
- 现有的模型,通常基于体外测试,可能无法完全捕捉体内单细胞行为的复杂性.
- 淋巴原型多能原始体 (LMPPs) 的血统关系和差异化潜力尤其具有争议.
研究的目的:
- 在单细胞水平上研究高性细胞和低性细胞的体内分化潜力和命运.
- 解决祖先种群中的异质性和血统承诺动态.
- 测试现有的血液形成模型,并根据经验单细胞数据提出替代方案.
主要方法:
- 利用定量细胞条码技术在体内高分辨率单细胞追踪HSC和LMPP.
- 分析了数百个单独的祖先的后代,以确定它们的分化输出.
- 检查来自单一祖先的兄弟细胞的命运,以评估血统印记.
主要成果:
- 在LMPP中表现出显著的异质性,不同的亚种群倾向于淋巴细胞,骨髓细胞或树突细胞的产生.
- 揭示了大多数血液细胞的产出源于能够产生所有血统的HSCs的一个小子集.
- 观察到来自单个LMPPs的兄弟细胞往往具有共同的命运,表明遗传性血统印记.
- 发现树突细胞偏向的LMPPs也表现出印记,这表明树突细胞具有明显的祖先起源.
结论:
- 这些发现支持了"分级承诺"的血液形成模型,挑战了以前的线性或二进制分支模型.
- 可遗传的血统印记在祖先发育过程中比以前认为的更早地发生.
- 树突细胞可能代表一个独特的血统,有着单独的祖先承诺.
- 单细胞分析提供了对血细胞形成的复杂性和调节的关键见解.
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