title: A novel activation induced lymphocyte surface antigen, 90.12, is also expressed on apoptotic cells.
abstract: We describe a monoclonal antibody, mAb 90.12, which recognizes a novel activation induced lymphocyte surface antigen. Flow cytometric analysis of normal tissues shows the antigen to be expressed on higher percentages of B lymphocytes in the bone marrow than in the spleen and the lymph node. Similarly, the 90.12 antigen is expressed on higher percentages of thymocytes than peripheral T cells. MAb 90. 12 immunoprecipitates three proteins with a molecular weight of 12-18 kDa which are not linked to the membrane by phosphotidylinositol. Expression of the 90.12 antigen is increased on activated B cells and the extent of upregulation varies with the stimulus. Lipopolysaccharide (LPS) stimulation results in expression on most B cells, while expression is upregulated on only a subset of B cells stimulated with anti-immunoglobulin M (IgM), interleukin(IL)4 and IL5. Finally, we show that 90.12 antigen expression is also increased on apoptotic cells.
authors.affiliation: Division of Monoclonal Antibodies, Center for Biologics Evaluation and Research, FDA, HFM-561, 1401 Rockville Pike, Rockville, MD 20852-1448, USA.
authors.forename: K J
authors.initials: KJ
authors.lastname: Clark
authors.forename: M
authors.initials: M
authors.lastname: Monser
authors.forename: K E
authors.initials: KE
authors.lastname: Stein
authors.forename: M A
authors.initials: MA
authors.lastname: Shapiro
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000096:biosynthesis; D000954:Antigens, Surface / Q000096:biosynthesis / Q000276:immunology*; D017209:Apoptosis / Q000276:immunology*; D001402:B-Lymphocytes / Q000276:immunology* / Q000378:metabolism; D002460:Cell Line; D005260:Female; D006801:Humans; D008213:Lymphocyte Activation / Q000276:immunology; D008214:Lymphocytes / Q000276:immunology / Q000378:metabolism; D051379:Mice; D008807:Mice, Inbred BALB C; D008811:Mice, Inbred DBA; D014018:Tissue Distribution; D014407:Tumor Cells, Cultured
chemical_list: D000911:Antibodies, Monoclonal; D000954:Antigens, Surface