title: A simplified method for enrichment of mouse hematopoietic stem cells.
abstract: A simplified method for enriching mouse hematopoietic stem cells using standard two-color fluorescence-activated cell sorting (FACS) has been developed. By eliminating one fluorescence parameter from a previously described four-parameter (three-color) method, FACS enrichment of mouse hematopoietic stem cells to a purity within twofold of that accomplished by the more complex method could be achieved using a single-laser, two-color FACS instrument. The method involves positive selection of mouse bone marrow cells expressing the Ly-6A.2 molecule (previously termed stem cell antigen-1, or Sca-1) and negative selection for expression of a number of cell surface markers characteristic of differentiated cells of hematolymphoid lineages (Lin-). Cell populations selected by this method contain 480 +/- 100 day-13 splenic colony-forming units (CFUs-13) per 10(4) cells, whereas the day-8 splenic colony-forming unit (CFUs-8) content is about tenfold lower. The frequency of thymic colony-forming units (CFUt) is about one in ten cells. Long-term hematopoietic repopulation of irradiated animals was observed following the transfer of 60-100 cells. However, as few as 20 cells could mediate radioprotection of lethally irradiated mice. An analysis of the cell surface phenotype of isolated Ly-6A.2+Lin- cells showed that 30%-50% expressed low levels of the Thy-1 antigen and that the CFUs-13 activity was predominantly associated with the Thy-1lo cells. The Ly-6A.2+Lin- cells expressed intermediate levels of phagocyte glycoprotein-1 (Pgp-1), low levels of heat-stable antigen (HSA), and high levels of class I major histocompatibility antigens (H2 K/D), leukocyte common antigen (Ly-5), and carbohydrate binding sites for the lectin wheat-germ agglutinin (WGA). By these criteria, Ly-6A.2+Lin- cells are phenotypically similar to mouse hematopoietic stem cells isolated by other methods.
authors.affiliation: Walter and Eliza Hall Institute for Medical Research, Parkville, Victoria, Australia.
authors.forename: G J
authors.initials: GJ
authors.lastname: Spangrude
authors.forename: R
authors.initials: R
authors.lastname: Scollay
mesh_terms: D000818:Animals; D015703:Antigens, CD / Q000032:analysis; D000943:Antigens, Differentiation / Q000032:analysis; D000950:Antigens, Ly / Q000032:analysis; D000954:Antigens, Surface / Q000032:analysis; D001402:B-Lymphocytes / Q000166:cytology / Q000276:immunology; D001854:Bone Marrow Cells; D002469:Cell Separation / Q000379:methods*; D005434:Flow Cytometry; D006183:H-2 Antigens / Q000032:analysis; D006412:Hematopoietic Stem Cells / Q000166:cytology*; D006649:Histocompatibility Antigens / Q000032:analysis; D017493:Leukocyte Common Antigens; D051379:Mice; D008810:Mice, Inbred C57BL; D010641:Phenotype; D016201:Receptors, Lymphocyte Homing; D013154:Spleen / Q000166:cytology; D013601:T-Lymphocytes / Q000166:cytology / Q000276:immunology; D018800:Thy-1 Antigens; D013950:Thymus Gland / Q000166:cytology; D014909:Wheat Germ Agglutinins / Q000378:metabolism
chemical_list: D015703:Antigens, CD; D000943:Antigens, Differentiation; D000950:Antigens, Ly; D000954:Antigens, Surface; D006183:H-2 Antigens; C024755:H-2K(K) antigen; D006649:Histocompatibility Antigens; D016201:Receptors, Lymphocyte Homing; D018800:Thy-1 Antigens; D014909:Wheat Germ Agglutinins; D017493:Leukocyte Common Antigens