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人脐血中 CD133 和 SSEA4 富集的非常小的胚胎样干细胞的分子和表型特征。

Molecular and phenotypic characterization of CD133 and SSEA4 enriched very small embryonic-like stem cells in human cord blood.

机构信息

Stem Cell Biology Department, National Institute for Research in Reproductive Health, Mumbai, India.

Jaslok Hospital & Research Centre, Mumbai, India.

出版信息

Leukemia. 2015 Sep;29(9):1909-17. doi: 10.1038/leu.2015.100. Epub 2015 Apr 17.

Abstract

Very small embryonic-like stem cells (VSELs) are immature primitive cells residing in adult and fetal tissues. This study describes enrichment strategy and molecular and phenotypic characterization of human cord blood VSELs. Flow cytometry analysis revealed that a majority of VSELs (LIN(-)/CD45(-)/CD34(+)) were present in the red blood cell (RBC) pellet after Ficoll-Hypaque centrifugation in contrast to the hematopoietic stem cells (LIN(-)/CD45(+)/CD34(+)) in the interphase layer. Thus, after lyses of RBCs, VSELs were enriched using CD133 and SSEA4 antibodies. These enriched cells were small in size (4-6 μm), spherical, exhibited telomerase activity and expressed pluripotent stem cell (OCT4A, OCT4, SSEA4, NANOG, SOX2, REX1), primordial germ cell (STELLA, FRAGILIS) as well as primitive hematopoietic (CD133, CD34) markers at protein and transcript levels. Heterogeneity was noted among VSELs based on subtle differences in expression of various markers studied. DNA analysis and cell cycle studies revealed that a majority of enriched VSELs were diploid, non-apoptotic and in G0/G1 phase, reflecting their quiescent state. VSELs also survived 5-fluorouracil treatment in vitro and treated cells entered into cell cycle. This study provides further support for the existence of pluripotent, diploid and relatively quiescent VSELs in cord blood and suggests further exploration of the subpopulations among them.

摘要

非常小的胚胎样干细胞(VSELs)是存在于成人和胎儿组织中的未成熟原始细胞。本研究描述了人脐血 VSELs 的富集策略及分子和表型特征。流式细胞术分析显示,与处于相间层的造血干细胞(LIN(-)/CD45(+)/CD34(+))相比,大多数 VSELs(LIN(-)/CD45(-)/CD34(+))在 Ficoll-Hypaque 离心后位于红细胞(RBC)沉淀中。因此,在 RBC 溶解后,使用 CD133 和 SSEA4 抗体富集 VSELs。这些富集的细胞体积较小(4-6μm),呈球形,具有端粒酶活性,并表达多能干细胞(OCT4A、OCT4、SSEA4、NANOG、SOX2、REX1)、原始生殖细胞(STELLA、FRAGILIS)以及原始造血(CD133、CD34)标志物在蛋白质和转录水平上。基于所研究的各种标志物表达的细微差异,注意到 VSELs 之间存在异质性。DNA 分析和细胞周期研究表明,大多数富集的 VSELs 是二倍体、非凋亡且处于 G0/G1 期,反映了它们的静止状态。VSELs 还能在体外耐受 5-氟尿嘧啶治疗,并且处理后的细胞进入细胞周期。本研究进一步支持了脐血中存在多能、二倍体和相对静止的 VSELs,并表明进一步探索其中的亚群。

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