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Hematopoietic differentiation of umbilical cord blood-derived very small embryonic/epiblast-like stem cells.

Abstract：

:A population of CD133(+)Lin(-)CD45(-) very small embryonic/epiblast-like stem cells (VSELs) has been purified by multiparameter sorting from umbilical cord blood (UCB). To speed up isolation of these cells, we employed anti-CD133-conjugated paramagnetic beads followed by staining with Aldefluor to detect aldehyde dehydrogenase (ALDH) activity; we subsequently sorted CD45(-)/GlyA(-)/CD133(+)/ALDH(high) and CD45(-)/GlyA(-)/CD133(+)/ALDH(low) cells, which are enriched for VSELs, and CD45(+)/GlyA /CD133(+)/ALDH(high) and CD45(+)/GlyA(-)/CD133(+)/ALDH(low) cells, which are enriched for hematopoietic stem/progenitor cells (HSPCs). Although freshly isolated CD45(-) VSELs did not grow hematopoietic colonies, the same cells, when activated/expanded over OP9 stromal support, acquired hematopoietic potential and grew colonies composed of CD45(+) hematopoietic cells in methylcellulose cultures. We also observed that CD45(-)/GlyA(-)/CD133(+)/ALDH(high) VSELs grew colonies earlier than CD45(-)/GlyA(-)/CD133(+)/ALDH(low) VSELs, which suggests that the latter cells need more time to acquire hematopoietic commitment. In support of this possibility, real-time polymerase chain reaction analysis confirmed that, whereas freshly isolated CD45(-)/GlyA(-)/CD133(+)/ALDH(high) VSELs express more hematopoietic transcripts (for example, c-myb), CD45(-)/GlyA(-)/CD133(+)/ALDH(low) VSELs exhibit higher levels of pluripotent stem cell markers (for example, Oct-4). More importantly, hematopoietic cells derived from VSELs that were co-cultured over OP9 support were able to establish human lympho-hematopoietic chimerism in lethally irradiated non-obese diabetic/severe combined immunodeficiency mice 4-6 weeks after transplantation. Overall, our data suggest that UCB-VSELs correspond to the most primitive population of HSPCs in UCB.

journal_name

Leukemia

journal_title

Leukemia

authors

Ratajczak J,Zuba-Surma E,Klich I,Liu R,Wysoczynski M,Greco N,Kucia M,Laughlin MJ,Ratajczak MZ

doi

10.1038/leu.2011.73

subject

Has Abstract

pub_date

2011-08-01 00:00:00

pages

1278-85

issue

8

eissn

0887-6924

issn

1476-5551

pii

leu201173

journal_volume

25

pub_type

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