Embryonic lung side population cells are hematopoietic and vascular precursors.

Embryonic lung side population cells are hematopoietic and vascular precursors.
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胚胎肺侧群细胞是造血和血管前体细胞。

DOI:
10.1165/rcmb.2005-0024oc
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发表时间:
2005
影响因子:
6.4
通讯作者:
A. Fine
A. Fine
中科院分区:
医学1区
文献类型:
--
作者:
R. Summer;D. Kotton;S. Liang;K. Fitzsimmons;Xi Sun;A. Fine

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侧群(SP)细胞是通过流出Hoechst染料的能力鉴定的选择细胞群,其高度富集干/祖细胞活性。在这项研究中,我们发现,SP细胞组成的CD 45(+)和CD 45(-)亚型存在于胚胎肺(E-SP)的水平随胎龄而变化。长期体内竞争性血液重建研究表明,造血干细胞能力存在于CD 45(+)E-SP细胞亚群中。CD 45(-)E-SP细胞的免疫表型确定该群体由两种亚型组成:CD 31(-)和CD 31(+)。有限的基因表达谱表明,CD 45(-)/CD 31(-)E-SP细胞具有平滑肌前体细胞的特征,并在培养中产生平滑肌。另一方面,CD 45(-)/CD 31(+)E-SP细胞表达内皮细胞的特征性基因,但其自身在培养中不生长或分化。然而,CD 45(-)/CD 31(+)和CD 45(-)/CD 31(-)E-SP细胞的共培养导致表达内皮标志物的复杂管状网络的形成。总之,这些研究结果表明,胚胎肺SP细胞是异质性的,造血和nonhematopoeitic祖细胞组成,并可能在肺血管系统的形成中发挥关键作用。
Side population (SP) cells are a select cell population identified by a capacity to efflux Hoechst dye that are highly enriched for stem/progenitor cell activity. In this study, we found that SP cells comprised of CD45(+) and CD45(-) subtypes are present in the embryonic lung (E-SP) at levels varying with gestational age. Long-term in vivo competitive blood reconstitution studies demonstrated that hematopoeitic stem cell capacity resided within the CD45(+) E-SP cell subset. Immunophenotyping of CD45(-) E-SP cells determined that this population consists of two subtypes: CD31(-) and CD31(+). Limited gene expression profiling indicated that CD45(-)/CD31(-) E-SP cells have features of smooth muscle precursors, and give rise to smooth muscle in culture. On the other hand, CD45(-)/CD31(+) E-SP cells express genes characteristic of endothelium, but by themselves do not grow or differentiate in culture. Co-culture of CD45(-)/CD31(+) and CD45(-)/CD31(-) E-SP cells, however, resulted in the formation of complex tubular networks that express markers of endothelium. Together, these findings illustrate that embryonic lung SP cells are heterogeneous, composed of hematopoeitic and nonhematopoeitic progenitors, and may play a key role in the formation of the lung vasculature.
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