title: A monoclonal antibody (BA-1) reactive with cells of human B lymphocyte lineage.
abstract: NALM-6-M1 is an acute lymphoblastic leukemia cell line previously shown in our laboratory to express the pre-B lymphocyte phenotype, i.e., cytoplasmic IgM+, surface immunoglobulin-. Hybridomas were produced against this cell line by fusing spleen cells from hyperimmunized mice with NS-1 mouse myeloma cells. One monoclonal antibody derived from this fusion, designated BA-1, reacted with peripheral blood B lymphocytes, chronic lymphocytic leukemias, pre-B-ALL, most non-Hodgkin's lymphomas, and most non-T, non-B-ALL. BA-1 showed weak reactivity with B lymphoblastoid cell lines and failed to react with multiple myeloma and pokeweed mitogen-induced plasma cells. BA-1 also reacted with peripheral blood granulocytes and the erythroleukemia cell line K-562. No reactivity was seen with cells of T lymphocyte origin, platelets, red cells, monocytes, or acute myelocytic leukemias. Evidence is presented indicating that the determinant recognized by BA-1 is not surface immunoglobulin, HLA-DR, or receptors for C3 or Fc. We conclude that monoclonal antibody BA-1 may be useful in the study of early stages of human B lymphocyte development.
mesh_terms: D000818:Animals; D000906:Antibodies; D001202:Ascitic Fluid / Q000276:immunology; D001402:B-Lymphocytes / Q000276:immunology*; D002999:Clone Cells / Q000276:immunology; D003176:Complement C3; D005260:Female; D006098:Granulocytes / Q000276:immunology; D006801:Humans; D006822:Hybrid Cells / Q000276:immunology; D007938:Leukemia / Q000276:immunology; D008223:Lymphoma / Q000276:immunology; D051379:Mice; D008807:Mice, Inbred BALB C; D011951:Receptors, Complement; D011961:Receptors, Fc
chemical_list: D000906:Antibodies; D003176:Complement C3; D011951:Receptors, Complement; D011961:Receptors, Fc