title: B5, a new B cell-restricted activation antigen.
abstract: The characterization of a new human B cell-restricted activation antigen (B5) is described in this report. With the use of a monoclonal antibody to B5, we show that B5 can be detected on peripheral blood or splenic B cells after 1 day of stimulation with either anti-immunoglobulin, protein A, Epstein Barr virus, or pokeweed mitogen. In contrast, B5 was not expressed on resting B, T, or myeloid cells. More important, B5 could not be detected on activated T cells or monocytes. The B5 antigen was expressed on some lymphoblastoid B cell lines and B cell neoplasms but was not expressed on leukemias or lymphomas of T or myeloid origin. The B5 antigen is distinct from previously reported B cell activation antigens by its m.w. and pattern of cellular expression. These studies suggest that B5 is a novel B cell-restricted activation antigen, which may be useful to study the events of early human B cell activation.
authors.forename: A S
authors.initials: AS
authors.lastname: Freedman
authors.forename: A W
authors.initials: AW
authors.lastname: Boyd
authors.forename: K C
authors.initials: KC
authors.lastname: Anderson
authors.forename: D C
authors.initials: DC
authors.lastname: Fisher
authors.forename: S F
authors.initials: SF
authors.lastname: Schlossman
authors.forename: L M
authors.initials: LM
authors.lastname: Nadler
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000096:biosynthesis; D000937:Antigen-Antibody Reactions; D000944:Antigens, Differentiation, B-Lymphocyte; D000951:Antigens, Neoplasm / Q000032:analysis / Q000276:immunology; D000954:Antigens, Surface / Q000276:immunology* / Q000302:isolation & purification; D001402:B-Lymphocytes / Q000276:immunology*; D001853:Bone Marrow / Q000276:immunology; D002460:Cell Line; D000939:Epitopes / Q000032:analysis; D005260:Female; D006801:Humans; D006825:Hybridomas / Q000378:metabolism; D008213:Lymphocyte Activation; D008221:Lymphoid Tissue / Q000276:immunology; D051379:Mice; D008807:Mice, Inbred BALB C; D013154:Spleen / Q000166:cytology
chemical_list: D000911:Antibodies, Monoclonal; D000944:Antigens, Differentiation, B-Lymphocyte; D000951:Antigens, Neoplasm; D000954:Antigens, Surface; D000939:Epitopes