title: Myeloid-associated differentiation antigens on stem cells and their progeny identified by monoclonal antibodies.
abstract: Within the hematopoietic system, monoclonal antibodies reactive with antigenic determinants, expressed in a lineage- and stage-restricted fashion, can be used to map myeloid differentiation. We have generated a series of monoclonal antibodies that reacts with myeloid-associated determinants on committed myeloid stem cells and their progeny. Their reactivity with peripheral blood cells was identified by immunofluorescence assays, with bone marrow cells by fluorescence-activated cell sorting, and with committed hematopoietic progenitor cells by both cytotoxic assays and fluorescence-activated cell sorting. Antibody 1G10, which has previously been reported to react with cells of the granulocytic lineage and with a minor subset of mature monocytes, was shown to react with granulocyte-macrophage colony-forming units (CFU-GM). Three antibodies not previously characterized (T5A7, L4F3, L1B2) were shown to react with both granulocytic and monocytic cells and in fluorescence-activated cell sorting studies to detectably stain granulocytic cells at different stages of maturation. These three antibodies also react with CFU-GM, two (L4F3 and L1B2) reacting with all CFU-GM, while T5A7 reacts with only a portion of the day 7 CFU-GM. Antibody L4F3 also reacts with a portion of erythroid burst-forming units (BFU-E). In contrast, the previously reported antibody 5F1, which reacts with monocytic cells, nucleated erythroid cells, and platelets, was shown to react with erythroid colony-forming units (CFU-E). Potential applications of these antibodies to studies of normal and malignant hematopoiesis are discussed.
mesh_terms: D000911:Antibodies, Monoclonal / Q000276:immunology*; D002454:Cell Differentiation; D000939:Epitopes / Q000032:analysis*; D004912:Erythrocytes / Q000276:immunology; D006098:Granulocytes / Q000276:immunology; D006412:Hematopoietic Stem Cells / Q000276:immunology*; D006801:Humans; D007938:Leukemia / Q000097:blood; D009000:Monocytes / Q000276:immunology; D013601:T-Lymphocytes / Q000276:immunology
chemical_list: D000911:Antibodies, Monoclonal; D000939:Epitopes