title: Characterization of rat T cell subset antigen by monoclonal antibody.
abstract: 6B2-B8 T cell hybridoma cells were used to immunize mice, and immune spleen cells were fused with NS/1 myeloma cells. One clone, designated RTH-7, reacted with 89.5% of rat thymocytes, 30.2% of rat spleen cells, and 42.3% of rat lymph node cells. The RTH-7 reacted with a subset of rat T cells but not with B cells. Double staining analysis demonstrated that RTH-7 stained a rat T cell subset distinct from R1-10B5-positive cells that were known to be equivalent to mouse Lyt-2. It was revealed that RTH-7 and W3/25 recognize different antigenic epitopes on the same molecule. The RTH-7 as well as W3/25 substantially inhibited the production of interleukin 2 by cells in mixed lymphocyte reaction and the lymphocyte proliferation induced by mixed lymphocyte reaction. The RTH-7 inhibited the lymphocyte proliferation induced by Con A whereas W3/25 failed to do so. The RTH-7 defined antigen has a molecular weight of 53,000 under reducing condition and 47,000 under nonreducing condition. The RTH-7 defined antigen showed a wide range of heterogeneity in pI (6.2-8.8). The associated molecule of approximate molecular weight of 27,000 was occasionally detected with the RTH-7 defined antigen in 6B2-B8 T cell hybridoma cells as well as peripheral T cells but not in thymocytes. Thus, RTH-7 detects a cell surface antigen of a functional T cell subset of rat origin.
mesh_terms: D000818:Animals; D000911:Antibodies, Monoclonal / Q000276:immunology*; D000945:Antigens, Differentiation, T-Lymphocyte / Q000032:analysis / Q000276:immunology*; D000954:Antigens, Surface / Q000032:analysis / Q000276:immunology; D002460:Cell Line; D002478:Cells, Cultured; D004591:Electrophoresis, Polyacrylamide Gel; D000939:Epitopes / Q000032:analysis / Q000276:immunology; D005260:Female; D005455:Fluorescent Antibody Technique; D006825:Hybridomas; D007118:Immunoassay; D007124:Immunoenzyme Techniques; D007376:Interleukin-2 / Q000096:biosynthesis; D008213:Lymphocyte Activation; D051379:Mice; D008807:Mice, Inbred BALB C; D008970:Molecular Weight; D051381:Rats; D011912:Rats, Inbred ACI; D011917:Rats, Inbred Lew; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D000911:Antibodies, Monoclonal; D000945:Antigens, Differentiation, T-Lymphocyte; D000954:Antigens, Surface; D000939:Epitopes; D007376:Interleukin-2