Searching for hematopoietic stem cells. II. The heterogeneity of Thy-1.1(lo)Lin(-/lo)Sca-1+ mouse hematopoietic stem cells separated by counterflow centrifugal elutriation.

Abstract:

:Mouse hematopoietic stem cells (HSCs) are highly enriched in the rare (approximately 0.05%) Thy-1.1(lo)Lin(-/lo)Sca-1+ fraction of hematopoietic tissues. It has been demonstrated that Thy-1.1(lo)Lin(-/lo)Sca-1+ cells are the only HSCs in C57BL/Ka-Thy-1.1 bone marrow. In this study, we separated C57/Ka-Thy-1.1 bone marrow cells by counterflow centrifugal elutriation (CCE) into four fractions and characterized Thy-1.1(lo)Lin(-/lo)Sca-1+ cells in each eluted fraction. The peak number of Thy-1.1(lo)Lin(-/lo)Sca-1+ cells was highly enriched in one eluted fraction, which was also highly enriched for day-12 to -13 CFU-S. Activities for day-13 CFU-S, radioprotection, and long-term multilineage reconstitution correlated with, and could be generally predicted by determining, the frequency of Thy-1.1(lo)Lin(-/lo)Sca-1+ cells in a given eluted fraction. However, the fraction that was highly enriched for blast cells and contained a low frequency of Thy-1.1(lo)Lin(-/lo)Sca-1+ cells, only provided short-term but not long-term radioprotection, with a predicted cell number (100 cells) that should have protected > or = 95% (PD95) of hosts. Still, when 300 Thy-1.1(lo)Lin(-/lo)Sca-1+ cells from this fraction (3 X PD95 for unfractionated HSCs) were injected, mice were radioprotected and donor cells provided long-term multilineage reconstitution. We propose that such blast cells may contain two Thy-1.1(lo)Lin(-/lo)Sca-1+ subsets, one providing short-term and the other long-term multilineage sustained hematopoiesis, the latter presumably due to HSC self-renewal.

journal_name

Exp Hematol

journal_title

Experimental hematology

authors

Uchida N,Jerabek L,Weissman IL

subject

Has Abstract

pub_date

1996-04-01 00:00:00

pages

649-59

issue

5

eissn

0301-472X

issn

1873-2399

journal_volume

24

pub_type

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