Endochondral ossification is required for haematopoietic stem-cell niche formation.

Endochondral ossification is required for haematopoietic stem-cell niche formation.
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DOI:
10.1038/nature07547
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发表时间:
2009-01-22
期刊:
影响因子:
64.8
通讯作者:
Weissman, Irving L.
Weissman, Irving L.
中科院分区:
综合性期刊1区
文献类型:
--
作者:
Chan, Charles K. F.;Chen, Ching-Cheng;Luppen, Cynthia A.;Kim, Jae-Beom;DeBoer, Anthony T.;Wei, Kevin;Helms, Jill A.;Kuo, Calvin J.;Kraft, Daniel L.;Weissman, Irving L.

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人们对干细胞维持所需的局部微环境--利基的形成知之甚少。在这里,我们开发了一种体内成人造血干细胞(HSC)生态位形成的方法。通过这项实验,我们鉴定了一组具有表面标记CD45-Tie2-αV+CD105+Thy1.1-(CD105+Thy1-)的祖细胞,当从15.5DPC胎骨(FB)中分离并移植到成年小鼠肾被膜下时,可以招募宿主来源的血管,通过软骨中间体产生供体来源的异位骨,并产生宿主来源的长期重组造血干细胞(LT-HSC)填充的骨髓腔。相反,CD45-Tie2-αV+CD105+Thy1+(CD105+Thy1+)FB祖细胞形成的骨不含骨髓腔。抑制软骨内成骨相关因子,如Osterix和VEGF的表达,抑制了生态位的产生。CD105+Thy1-祖细胞群体来源于胎儿下颌骨或颅骨中未发生软骨内骨化的区域,在我们的检测中只形成了没有骨髓的骨。总体而言,我们的数据表明软骨内骨化,即通过软骨中间体进行的骨形成,是成人HSC骨龛形成的必要条件。
Little is known about the formation of niches, local micro-environments required for stem cell maintenance. Here we develop an in vivo assay for adult hematopoietic stem cell (HSC) niche formation. With this assay, we identified a population of progenitor cells with surface markers CD45-Tie2-αV+CD105+Thy1.1- (CD105+Thy1-) that when sorted from 15.5 dpc fetal bones (fb) and transplanted under the adult mouse kidney capsule could recruit host-derived blood vessels, produce donor-derived ectopic bones through a cartilage intermediate, and generate a marrow cavity populated by host-derived long term reconstituting HSC (LT-HSC). In contrast, CD45-Tie2-αV+CD105+Thy1+ (CD105+Thy1+) fb progenitors form bone that does not contain a marrow cavity. Suppressing expression of factors involved in endochondral ossification, such as osterix and VEGF, inhibited niche generation. CD105+Thy1-progenitor populations derived from regions of the fetal mandible or calvaria that do not undergo endochondral ossification formed only bone without marrow in our assay. Collectively, our data implicates endochondral ossification, bone formation that proceeds through a cartilage intermediate, as a requirement for adult HSC niche formation.
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