title: Enrichment and functional characterization of Sca-1+WGA+, Lin-WGA+, Lin-Sca-1+, and Lin-Sca-1+WGA+ bone marrow cells from mice with an Ly-6a haplotype.
abstract: Approximately 4% to 5% of all bone marrow (BM) cells and 8% to 9% of low density BM cells from FVB/N and BALB/c mice (Ly-6a haplotype) show high to intermediate expression of Ly-6E.1 antigen, recognized by the Sca-1 antibody. Functional properties of enriched cells expressing Ly-6E.1-allelic form of Sca-1 antigen were analyzed and correlated with the properties of cells expressing the carbohydrate binding sites for the lectin wheat-germ agglutinin (WGA). Using equilibrium density centrifugation and fluorescence-activated cell sorting, Sca-1+WGA+, Lin-WGA+, Lin-Sca-1+, and Lin-Sca-1+WGA+ cells were isolated and their splenic colony-forming unit (CFU-S) cell content, radioprotection ability, and long-term reconstitution capacity determined. Enriched Sca-1+WGA+, Lin-WGA+, Lin-Sca-1+ and Lin-Sca-1+WGA+ cells gave rise to 1 CFU-S12 cell out of 26, 20, 21, and 15 sorted cells, respectively. When transplanted into lethally irradiated recipients (100 to 500 cells/mouse) all populations rescued 70% to 100% of recipients in a 30-day radioprotection assay and mediated survival of 40% to 80% of recipients 6 months after transplantation. Using transgenic mice as cell donors we have shown that 12 to 16 weeks after transplantation of 100 Sca-1+WGA+, Lin-WGA+, Lin-Sca-1+, and Lin-Sca-1+WGA+ cells, 40% to 80% of recipients had donor cells in BM, spleen, thymus, and lymph nodes. These results indicate that the population of cells expressing Ly-6E.1 form of Sca-1 antigen in two analyzed mouse strains with Ly-6a haplotype contains CFU-S and long-term repopulating cells. Furthermore, the data suggest that, at least in FVB/N mice, day-12 CFU-S cells and cells with long-term repopulating capacity simultaneously express Ly-6E.1 form of Sca-1 antigen and WGA-binding molecules.
authors.affiliation: Institute for Molecular Genetics, Howard Hughes Medical Institute, Baylor College of Medicine, Houston, TX 77030.
authors.forename: R
authors.initials: R
authors.lastname: Jurecic
authors.forename: N T
authors.initials: NT
authors.lastname: Van
authors.forename: J W
authors.initials: JW
authors.lastname: Belmont
mesh_terms: D000818:Animals; D000950:Antigens, Ly / Q000032:analysis* / Q000235:genetics* / Q000502:physiology; D001483:Base Sequence; D001854:Bone Marrow Cells; D016026:Bone Marrow Transplantation; D002470:Cell Survival; D006239:Haplotypes; D006412:Hematopoietic Stem Cells / Q000502:physiology*; D008565:Membrane Proteins / Q000032:analysis*; D051379:Mice; D008807:Mice, Inbred BALB C; D008969:Molecular Sequence Data; D011835:Radiation Protection; D014909:Wheat Germ Agglutinins / Q000378:metabolism*
chemical_list: D000950:Antigens, Ly; C074650:Ly6a protein, mouse; D008565:Membrane Proteins; D014909:Wheat Germ Agglutinins