title: Human lymphocyte markers defined by antibodies derived from somatic cell hybrids. IV. A monoclonal antibody reacting specifically with a subpopulation of human B lymphocytes.
abstract: The technique of somatic cell hybridization has been used to produce a monoclonal antibody (designated FMC7) against the human B lymphoblastoid cell line HRIK. By indirect immunofluorescence FMC7 reacted with a total of 3 out of 10 B cell lines, but failed to bind T and Null cell lines. On normal peripheral blood, FMC7 bound between 3 and 6% of mononuclear cells. When normal peripheral blood mononuclear cells were fractionated, FMC7 reacted with only the B-enriched fraction, staining some but not all cells expressing SMIg. Double marker analysis indicated that the antigen detected by FMC7 is not identical with any of the conventional B cell markers, including surface membrane IgM, C3 receptors, Fc receptors, and the binding site for mouse erythrocytes. Another monoclonal antibody, FMC1, which reacts specifically with B lymphocytes, binds a separate antigenic determinant. Thus, FMC7 appears to recognize a previously undetected marker present specifically on a subpopulation of human B lymphocytes. FMC7 reacts with some but not all B cell leukemias and may have diagnostic applications in leukemia.
mesh_terms: D000818:Animals; D000906:Antibodies / Q000276:immunology*; D000918:Antibody Specificity; D000941:Antigens / Q000276:immunology; D001402:B-Lymphocytes / Q000145:classification / Q000276:immunology*; D002460:Cell Line; D002999:Clone Cells / Q000276:immunology; D006801:Humans; D006822:Hybrid Cells / Q000276:immunology*; D007942:Leukemia, Experimental / Q000276:immunology; D008214:Lymphocytes / Q000276:immunology*; D051379:Mice; D008807:Mice, Inbred BALB C; D010586:Phagocytes / Q000276:immunology
chemical_list: D000906:Antibodies; D000941:Antigens