title: A monoclonal antibody recognizing HLA-DR2 on malignant and activated cells.
abstract: A monoclonal antibody, designated NDS15.38, which recognizes a polymorphic determinant of HLA-DR, was produced from a fusion in which mice were immunized with the human B lymphoblastoid cell line GIR2 (HLA type A1, B8, 27, Cw2, DR2,7). NDS15.38 functions efficiently as an affinity column and purifies a two-chain complex of molecular weight 33 000 and 30 000 under reducing conditions. The monoclonal antibody reacts with HLA-DR2-positive B lymphoblastoid cell lines and B lymphocytes from patients with chronic lymphatic leukemia in an indirect radioactive binding assay. However, NDS15.38 does not appear to react with peripheral blood B lymphocytes from normal individuals. Using a peroxidase staining technique, NDS15.38 was shown to react with phytohemagglutin (PHA)-stimulated lymphocytes and with apparently activated B cells in the germinal centers of lymph nodes from individuals who were tissue typed as HLA-DR2. Thus it appears that NDS15.38 recognizes a polymorphic determinant of HLA-DR on malignant and stimulated cells, but not on resting cells.
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal; D000936:Antigen-Antibody Complex; D001402:B-Lymphocytes / Q000276:immunology; D002460:Cell Line; D000939:Epitopes / Q000032:analysis*; D005802:Genes, MHC Class II; D006680:HLA Antigens / Q000032:analysis; D006684:HLA-DR Antigens; D000949:Histocompatibility Antigens Class II / Q000032:analysis*; D006801:Humans; D007124:Immunoenzyme Techniques; D007945:Leukemia, Lymphoid / Q000276:immunology; D051379:Mice; D008807:Mice, Inbred BALB C; D008970:Molecular Weight; D011110:Polymorphism, Genetic
chemical_list: D000911:Antibodies, Monoclonal; D000936:Antigen-Antibody Complex; D000939:Epitopes; D006680:HLA Antigens; D006684:HLA-DR Antigens; D000949:Histocompatibility Antigens Class II