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Blood, 15 February 2008, Vol. 111, No. 4, pp. 2444-2451.
Prepublished online as a Blood First Edition Paper on November 30, 2007; DOI 10.1182/blood-2007-09-115006.
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Submitted September 28, 2007
Accepted November 25, 2007
CD150 negative Side Population cells represent a functionally distinct population of long-term hematopoietic stem cells
David C Weksberg, Stuart M Chambers, Nathan C Boles, and Margaret A Goodell*
Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX, United States
Interdepartmental Program in Cell and Molecular Biology, Baylor College of Medicine, Houston, TX, United States
Stem Cells and Regenerative Medicine Center, Baylor College of Medicine, Houston, TX, United States
* Corresponding author; email: goodell{at}bcm.edu.
Hematopoietic stem cells are a self-renewing population of bone marrow cells which replenish the cellular elements of blood throughout life. HSCs represent a paradigm for the study of stem cell biology, as robust methods for prospective isolation of HSCs have facilitated rigorous characterization of these cells. Recently, a new isolation method was reported, using the SLAM family of cell surface markers, including CD150 (SlamF1), to offer potential advantages over established protocols. We examined the overlap between SLAM family member expression with an established isolation scheme based on Hoechst dye efflux (side population, SP) in conjunction with canonical HSC cell surface markers (Sca-1, c-Kit, and lineage markers). Importantly, we find that stringent gating of SLAM markers is essential to achieving purity in HSC isolation, and that the inclusion of canonical HSC markers in the SLAM scheme can greatly augment HSC purity. Furthermore, we observe that both CD150+ and CD150-cells can be found within the SP population, and that both populations can contribute to long-term multilineage reconstitution. Thus, using SLAM family markers to isolate HSCs neglects a substantial fraction of the marrow HSC compartment. Interestingly, these two subpopulations are functionally distinct, with respect to lineage output as well as proliferative status.

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