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Cell tracing shows the contribution of the yolk sac to adult haematopoiesis

机译:细胞示踪显示卵黄囊对成年造血功能的贡献

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摘要

The first haematopoietic stem cells (HSCs) appear in the aorta-gonad-mesonephros (AGM) region, major vitelline and umbilical vessels, and placenta; however, whether they arise locally or from immigrant yolk sac precursor cells remains unclear. This issue is best addressed by measuring cell-lineage relationships rather than cell potentials. To undertake long-term in vivo tracing of yolk sac cells, we designed a non-invasive pulse-labelling system based on Cre/IoxP recombination. Here we show that in Runx1~(+/-) (runt-related transcription factor 1) heterozygous mice, yolk sac cells expressing Runx1 at embryonic day 7.5 develop into fetal lymphoid progenitors and adult HSCs. During mid-gestation the labelled (embryonic day 7.5) yolk sac cells colonize the umbilical cord, the AGM region and subsequently the embryonic liver. This raises the possibility that some HSCs associated with major embryonic vasculature are derived from yolk sac precursors. We observed virtually no contribution of the labelled cells towards the yolk sac vasculature, indicating early segregation of endothelial and haematopoietic lineages.
机译:最早的造血干细胞(HSC)出现在主动脉-性腺-中肾(AGM)区域,主要的卵黄和脐带血管以及胎盘中。然而,它们究竟是局部产生还是来自卵黄囊的前体细胞仍不清楚。通过测量细胞谱系关系而不是细胞电位,可以最好地解决此问题。为了进行卵黄囊细胞的长期体内追踪,我们设计了基于Cre / IoxP重组的非侵入性脉冲标记系统。在这里,我们显示在Runx1〜(+/-)(与矮子相关的转录因子1)杂合子小鼠中,在胚胎第7.5天表达Runx1的卵黄囊细胞发育成胎儿淋巴祖细胞和成年HSC。在妊娠中期,标记的(胚胎第7.5天)卵黄囊细胞在脐带,AGM区和随后的胚胎肝脏中定殖。这增加了一些与主要胚胎脉管系统相关的HSC源自卵黄囊前体的可能性。我们观察到标记的细胞对卵黄囊脉管系统几乎没有贡献,表明内皮和造血谱系的早期分离。

著录项

  • 来源
    《Nature》 |2007年第7139期|p.1056-1061|共6页
  • 作者单位

    Laboratory for Stem Cell Biology, Center for Developmental Biology, RIKEN Kobe, Kobe 650-0047, Japan;

  • 收录信息 美国《科学引文索引》(SCI);美国《工程索引》(EI);美国《生物学医学文摘》(MEDLINE);美国《化学文摘》(CA);
  • 原文格式 PDF
  • 正文语种 eng
  • 中图分类 自然科学总论;
  • 关键词

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