title: Biochemical analysis of human T lymphocyte differentiation antigens T4 and T5.
abstract: Two major functionally distinct T cell subsets in man have been defined with heteroantiserums and monoclonal antibodies directed against stable cell surface antigens that appear during thymic ontogeny. A monoclonal antibody to T4 antigen (anti-T4) is reactive with the peripheral inducer T cell population while a monoclonal antibody to T5 antigen (anti-T5) is reactive with the cytotoxic and suppressor population. Immunoprecipitation and electrophoresis on sodium dodecyl sulfate polyacrylamide gel were used to show that on human thymocytes or peripheral T cells the T4 antigen is a single 62,000-dalton glycoprotein while the T5 antigen is a complex of two glycoproteins, one being 30,000 daltons and the other 32,000 daltons. Similar glycoproteins have been isolated with antibodies to murine Lyt 1 and Lyt 2,3 antigens. Both the antigens defining the phenotypes of inducer and suppressor populations in man and mouse are structurally homologous.
mesh_terms: D000818:Animals; D000906:Antibodies; D000954:Antigens, Surface / Q000032:analysis*; D004591:Electrophoresis, Polyacrylamide Gel; D006023:Glycoproteins / Q000032:analysis; D006801:Humans; D051379:Mice; D008970:Molecular Weight; D013601:T-Lymphocytes / Q000276:immunology*; D013950:Thymus Gland / Q000276:immunology
chemical_list: D000906:Antibodies; D000954:Antigens, Surface; D006023:Glycoproteins