title: Rabbit antisera to cell lines RC2a and U937: antigens expressed on human leukaemic cells of myeloid, monocyte and T-lymphocyte lineage.
abstract: Rabbit antisera have been produced to an acute myelomonocytic leukaemia (AMML)-derived cell line (RC2a) and a histiocytic lymphoma derived cell line (U937) having macrophage characteristics. The antisera were screened by complement-mediated cytotoxicity and immunofluorescence (cytofluorograph analysis) against separated leukaemic (122 patients plus 13 cell lines) and normal haematologic cell populations (60 preparations from 20 donors plus 10 B-lymphoblastoid cell lines). The sera were absorbed with pooled B-lymphoblastoid cell lines including the autologous B-lymphoblastoid cell line to RC2a (CESS-B) or alternatively with B-CLL and T-CLL cells. All leukaemic cell populations were confirmed using the markers SIg, E-rosette receptor, cALL antigen, alpha-naphthyl butyrate esterase and myeloperoxidase. Rabbit anti-RC2a (Adherent cells) (RARC2a(Ad) ) and rabbit anti-U937 (RAU937) recognised antigens common to immature myeloid monocyte and T-lymphocyte lineage but did not react by cytotoxicity, absorption or cytofluorographic analysis with cells of B-lymphocyte lineage (B-lymphoblastoid or B-CLL) and reacted only occasionally with cALL patients' cells (includes pre B phenotype). These sera reacted with peripheral blood monocytes but not with other mature blood leucocytes. RAU937 reacted with a major mononuclear population from normal marrow and with more differentiated myeloid leukaemia cells. RARC2a(Ad) and RAU937 detected overlapping subgroups of myeloid leukaemia (AMoL, AMML, AML and CML) patients and Null-ALL and T-ALL patients. These subgroups are now being examined for prognostic significance.
mesh_terms: D000818:Animals; D000945:Antigens, Differentiation, T-Lymphocyte; D000951:Antigens, Neoplasm / Q000032:analysis*; D000954:Antigens, Surface / Q000032:analysis; D002460:Cell Line; D003601:Cytotoxicity Tests, Immunologic; D006098:Granulocytes / Q000276:immunology*; D006410:Hematopoiesis; D006801:Humans; D007106:Immune Sera; D007938:Leukemia / Q000097:blood / Q000145:classification / Q000276:immunology*; D007945:Leukemia, Lymphoid / Q000276:immunology; D007951:Leukemia, Myeloid / Q000276:immunology; D015470:Leukemia, Myeloid, Acute / Q000276:immunology; D009000:Monocytes / Q000276:immunology*; D011817:Rabbits; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D000945:Antigens, Differentiation, T-Lymphocyte; D000951:Antigens, Neoplasm; D000954:Antigens, Surface; D007106:Immune Sera