Fate tracing reveals the endothelial origin of hematopoietic stem cells.

Fate tracing reveals the endothelial origin of hematopoietic stem cells.
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DOI:
10.1016/j.stem.2008.09.018
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发表时间:
2008-12-04
期刊:
影响因子:
23.9
通讯作者:
Iruela-Arispe ML
Iruela-Arispe ML
中科院分区:
医学1区
文献类型:
--
作者:
Zovein AC;Hofmann JJ;Lynch M;French WJ;Turlo KA;Yang Y;Becker MS;Zanetta L;Dejana E;Gasson JC;Tallquist MD;Iruela-Arispe ML

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造血干细胞 (HSC) 起源于妊娠中期胚胎的主动脉-性腺-中肾 (AGM) 区域,但导致其出现的细胞类型尚不清楚,因为关键的造血因子在 AGM 内皮及其底层间质中表达。在这里,我们采用时间限制的遗传追踪策略来选择性地标记内皮细胞,并在 AGM 发育过程中单独标记其潜在的间质。通过诱导型 VE-钙粘蛋白 Cre 系进行谱系追踪内皮细胞,揭示内皮细胞能够产生 HSC。内皮后代迁移到胎儿肝脏,随后迁移到骨髓,能够扩张、自我更新和多谱系造血分化。 HSC 能力完全是内皮细胞的,因为离体分析表明循环和胎儿肝脏造血群体中缺乏 VE-钙粘蛋白 Cre 诱导。此外,通过心肌素 Cre 系选择性追踪,AGM 间充质不具备造血能力。因此,我们的基因追踪策略揭示了 HSC 的内皮起源。
Hematopoietic stem cells (HSCs) originate within the aorta-gonado-mesonephros (AGM) region of the midgestation embryo, but the cell type responsible for their emergence is unknown since critical hematopoietic factors are expressed in both the AGM endothelium and its underlying mesenchyme. Here we employ a temporally restricted genetic tracing strategy to selectively label the endothelium, and separately its underlying mesenchyme, during AGM development. Lineage tracing endothelium, via an inducible VE-cadherin Cre line, reveals that the endothelium is capable of HSC emergence. The endothelial progeny migrate to the fetal liver, and later to the bone marrow, are capable of expansion, self-renewal, and multi-lineage hematopoietic differentiation. HSC capacity is exclusively endothelial, as ex vivo analyses demonstrate lack of VE-cadherin Cre induction in circulating and fetal liver hematopoietic populations. Moreover, AGM mesenchyme, as selectively traced via a myocardin Cre line, is incapable of hematopoiesis. Our genetic tracing strategy therefore reveals an endothelial origin of HSCs.
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发表时间: 2006-03-01
影响因子: 2.5
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