The CXCR4 Antagonist BL-8040 Induces a Robust Mobilization of CD34+CD38−CD45RA−CD90+ CD49f+ HSCs with Long-Term and Secondary Myeloid and Lymphoid Repopulating Activity (original) (raw)

Blood, 2017

Abstract

Introduction: Lifelong blood cell production is dependent on rare hematopoietic stem cells (HSCs) to perpetually replenish mature cells via a series of lineage-restricted intermediates. The bulk of HSCs are CD34+, however, most CD34+ cells are lineage-restricted progenitors and HSCs remain rare. HSCs can be enriched further based on CD45RA, Thy1 (CD90), and CD38 expression. Loss of CD90 expression was proposed to be sufficient to separate CD34+CD38−CD45RA− CD90+ HSCs from CD34+CD38−CD45RA− CD90- multipotent progenitors (MPPs). Recently, it was demonstrated that the expression CD49f is a specific HSC marker. Single CD49f(+) cells were highly efficient in generating long-term multilineage grafts, and the loss of CD49f expression identified transiently engrafting MPPs. Results: CD34+ cells were purified from BL-8040 and G-CSF mobilized grafts and stained for CD38, CD45RA, CD90, and CD49f. The percentage of CD34+CD38- hematopoietic stem and progenitors was similar in both grafts (Figure...

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