title: Identification of a p69,71 complex expressed on human T cells sharing determinants with B-type chronic lymphatic leukemic cells.
abstract: In the course of generating monoclonal antibodies to human thymus-dependent differentiation antigens, we were able to define specificities shared by T cells and by cells from patients with chronic lymphatic leukemia that were not detectable on normal B cells. In particular, one of these antibodies was reactive by indirect immunofluorescence with greater than 95% of the thymocytes and 80--95% of nonadherent sheep erythrocyte-rosetting peripheral blood lymphocytes (PBL), but was unreactive with normal B cells or cell lines derived from PBL by Epstein-Barr virus transformation. However, the leukemic cells from 11 of 14 patients with B-type chronic lymphatic leukemia were found to express detectable concentrations of this surface determinant. The target antigen recognized by this monoclonal antibody was shown by immunoprecipitation and sodium dodecyl sulfate-polyacrylamide gel electrophoresis to be a p69,71 complex. Our findings suggest a possible relationship between this antigen and the previously described GIX system in the mouse.
mesh_terms: D000818:Animals; D000951:Antigens, Neoplasm / Q000032:analysis; D000954:Antigens, Surface / Q000032:analysis*; D001402:B-Lymphocytes / Q000276:immunology*; D003429:Cross Reactions; D000939:Epitopes; D006801:Humans; D007945:Leukemia, Lymphoid / Q000276:immunology*; D008565:Membrane Proteins / Q000276:immunology; D051379:Mice; D008819:Mice, Nude / Q000276:immunology; D008970:Molecular Weight; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D000951:Antigens, Neoplasm; D000954:Antigens, Surface; D000939:Epitopes; D008565:Membrane Proteins