CD150- side population cells represent a functionally distinct population of long-term hematopoietic stem cells.
Hematopoietic stem cells (HSCs) are a self-renewing population of bone marrow cells that replenish the cellular elements of blood throughout life. HSCs represent a paradigm for the study of stem-cell biology, because 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 excludes a substantial fraction of the marrow HSC compartment. Interestingly, these 2 subpopulations are functionally distinct, with respect to lineage output as well as proliferative status.
Department of Molecular and Human Genetics, Baylor College of Medicine, Houston, TX, USA.
David C
DC
Weksberg
Stuart M
SM
Chambers
Nathan C
NC
Boles
Margaret A
MA
Goodell
D000818:Animals; D015703:Antigens, CD / Q000032:analysis* / Q000235:genetics; D015415:Biomarkers / Q000032:analysis; D001973:Bromodeoxyuridine; D002469:Cell Separation; D018380:Hematopoietic Stem Cell Transplantation; D006412:Hematopoietic Stem Cells / Q000166:cytology* / Q000502:physiology; D051379:Mice; D008810:Mice, Inbred C57BL; D011956:Receptors, Cell Surface / Q000032:analysis* / Q000172:deficiency / Q000235:genetics; D000071177:Signaling Lymphocytic Activation Molecule Family Member 1; D018183:Transplantation Chimera
D015703:Antigens, CD; D015415:Biomarkers; D011956:Receptors, Cell Surface; C000604059:SLAMF1 protein, human; C000604062:Slamf1 protein, mouse; D000071177:Signaling Lymphocytic Activation Molecule Family Member 1; D001973:Bromodeoxyuridine