title: Streptococcal group A carbohydrate has properties of both a thymus-independent (TI-2) and a thymus-dependent antigen.
abstract: Streptococcal group A carbohydrate, which elicits mouse antibody of primarily the IgM and IgG3 isotypes, is relatively nonimmunogenic in nu/nu or xid mice, and thus appears to be a type of TD-2 antigen. The TD-2 antigens described previously have been proteins that elicit IgG antibody primarily of the IgG1 and IgG2 isotypes. Our findings indicate that TD-2 properties may also be a characteristic of at least some carbohydrate antigens that can elicit IgG antibody predominantly of the IgG3 class.
mesh_terms: D000818:Animals; D000907:Antibodies, Bacterial / Q000096:biosynthesis; D000942:Antigens, Bacterial / Q000276:immunology*; D001428:Bacterial Vaccines / Q000276:immunology; D016026:Bone Marrow Transplantation; D004136:Dinitrobenzenes / Q000276:immunology; D006433:Hemocyanins / Q000276:immunology; D007074:Immunoglobulin G / Q000096:biosynthesis; D008297:Male; D051379:Mice; D008805:Mice, Inbred A; D008806:Mice, Inbred AKR; D008808:Mice, Inbred CBA; D008819:Mice, Nude; D011135:Polysaccharides, Bacterial / Q000276:immunology*; D013297:Streptococcus pyogenes / Q000276:immunology*; D013934:Thymectomy; D013950:Thymus Gland / Q000276:immunology*
chemical_list: D000907:Antibodies, Bacterial; D000942:Antigens, Bacterial; D001428:Bacterial Vaccines; D004136:Dinitrobenzenes; D007074:Immunoglobulin G; D011135:Polysaccharides, Bacterial; D006433:Hemocyanins