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Blood, 1 February 2006, Vol. 107, No. 3, pp. 924-930.
Prepublished online as a Blood First Edition Paper on October 11, 2005; DOI 10.1182/blood-2005-05-2140.
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HEMATOPOIESIS
SLAM family markers are conserved among hematopoietic stem cells from old and reconstituted mice and markedly increase their purity
Ömer H. Yilmaz,
Mark J. Kiel, and
Sean J. Morrison
From the Howard Hughes Medical Institute, Life Sciences Institute, Department of Internal Medicine, and Center for Stem Cell Biology, University of Michigan, Ann Arbor, MI.
Recent advances have increased the purity of hematopoietic stem cells (HSCs) isolated from young mouse bone marrow. However, little attention has been paid to the purity of HSCs from other contexts. Although Thy-1lowSca-1+Lineage-c-kit+ cells from young bone marrow are highly enriched for HSCs (1 in 5 cells gives long-term multilineage reconstitution after transplantation into irradiated mice), the same population from old, reconstituted, or cytokine-mobilized mice engrafts much less efficiently (1 in 78 to 1 in 185 cells gives long-term multilineage reconstitution). To test whether we could increase the purity of HSCs isolated from these contexts, we examined the SLAM family markers CD150 and CD48. All detectable HSCs from old, reconstituted, and cyclophosphamide/G-CSF-mobilized mice were CD150+CD48-, just as in normal young bone marrow. Thy-1lowSca-1+Lineage-c-kit+ cells from old, reconstituted, or mobilized mice included mainly CD48+ and/or CD150- cells that lacked reconstituting ability. CD150+CD48-Sca-1+Lineage-c-kit+ cells from old, reconstituted, or mobilized mice were much more highly enriched for HSCs, with 1 in 3 to 1 in 7 cells giving long-term multilineage reconstitution. SLAM family receptor expression is conserved among HSCs from diverse contexts, and HSCs from old, reconstituted, and mobilized mice engraft relatively efficiently after transplantation when contaminating cells are eliminated.
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