title: Differential expression of HLA-DR and DR-linked determinants on human leukemias and lymphoid cells.
abstract: Leukemic and normal hemopoietic cells were examined with the monoclonal anti-bodies DA2 and Genox 353 for the presence of HLA-DR and DR-linked (DC/MB) determinants, respectively. Although most non-T acute leukemias and leukemic cell lines expressed the monomorphic DR determinant detected by DA2, fewer than expected expressed the DR-linked polymorphic specificity detected by Genox 353. TdT+ lymphoid precursors from normal bone marrow were also DA2+ but Genox 353-. T cells and thymocytes which were DA2-, Genox 353- became DA2+, Genox 353+ after activation in vitro. Immunoprecipitation using DA2 and Genox 353 gave bands on polyacrylamide gel-electrophoresis which were of different molecular weights. In addition, DA2 could absorb out Genox 353 determinants from a cell lysate whereas Genox 353 could not absorb out DA2 determinants. It is concluded that DA2 and Genox 353 detect HLA-DR and DR-linked (DC1/MB1) determinants, respectively, and that these are differentially expressed on hemopoietic cells during differentiation.
mesh_terms: D000911:Antibodies, Monoclonal; D000951:Antigens, Neoplasm / Q000032:analysis*; D000954:Antigens, Surface / Q000032:analysis; D002454:Cell Differentiation; D002460:Cell Line; D000939:Epitopes; D006684:HLA-DR Antigens; D006412:Hematopoietic Stem Cells / Q000276:immunology; D000949:Histocompatibility Antigens Class II / Q000276:immunology*; D006801:Humans; D007938:Leukemia / Q000276:immunology*; D008214:Lymphocytes / Q000166:cytology / Q000276:immunology*
chemical_list: D000911:Antibodies, Monoclonal; D000951:Antigens, Neoplasm; D000954:Antigens, Surface; D000939:Epitopes; D006684:HLA-DR Antigens; D000949:Histocompatibility Antigens Class II