title: Antigenically distinct subpopulations of myeloid progenitor cells (CFU-GM) in human peripheral blood and marrow.
abstract: Two types of progenitor cells of the human granulocytic and monocytic lineages (CFU-GM) can be distinguished by using mouse monoclonal antibodies against human hemopoietic cells. Type 1 CFU-GM contribute all of the peripheral blood CFU-GM as well as a small fraction of bone marrow CFU-GM and express surface antigens recognized by "anti-lymphomonocytic" monoclonal antibodies S3-13 and S17-25 but not the antigens recognized by R1B19 and WGHS-29-1 (two monoclonal antibodies that react with all the cells of the granulocytic lineage). Type 2 CFU-GM are present only in the marrow and react with S3-13, R1B19, and WGHS-29-1. Partial reactivity with S17-25 was observed only in the complement-dependent cytotoxicity test. In vitro culture of type 1 CFU-GM in liquid medium in the presence of granulocyte-macrophage colony-stimulatory factor (GM-CSF) generates colony-forming cells that have the surface phenotype of type 2 CFU-GM. This finding supports the idea of two different stages of maturation of myelomonocytic progenitor cells represented by type 1 and type 2 CFU-GM.
mesh_terms: D000328:Adult; D000911:Antibodies, Monoclonal; D000954:Antigens, Surface / Q000032:analysis*; D001853:Bone Marrow / Q000276:immunology*; D002469:Cell Separation; D003165:Complement System Proteins / Q000276:immunology; D003602:Cytotoxicity, Immunologic; D000939:Epitopes / Q000032:analysis; D005434:Flow Cytometry; D006412:Hematopoietic Stem Cells / Q000276:immunology*; D006801:Humans; D007962:Leukocytes / Q000276:immunology; D010641:Phenotype; D013601:T-Lymphocytes / Q000276:immunology
chemical_list: D000911:Antibodies, Monoclonal; D000954:Antigens, Surface; D000939:Epitopes; D003165:Complement System Proteins