title: Bacterial toxin superantigens activate human T lymphocytes reactive with myelin autoantigens.
abstract: Some bacteria that are common human pathogens produce protein toxins that are potent activators of human T lymphocytes expressing certain types of T-cell receptors. In this study we examined the ability of staphylococcal toxins to stimulate human T lymphocytes that also recognized the myelin autoantigens myelin basic protein and proteolipid protein. T-cell populations responding to myelin basic protein or proteolipid protein were isolated from 4 subjects including 1 individual with multiple sclerosis. All myelin antigen-specific T cells responded in proliferation studies to at least one of the nine superantigenic toxins used in this study. The superantigenic toxins were up to 7 x 10(5)-fold more potent in proliferation assays than the myelin antigens to which the T cells were initially sensitized. In addition, cytotoxic, myelin basic protein-reactive T lymphocytes lysed antigen-presenting cells incubated with superantigenic toxins. These findings demonstrate a mechanism by which some bacterial infections might produce activation of myelin basic protein- and proteolipid protein-reactive T lymphocytes and perhaps contribute to demyelinating disease in humans.
authors.affiliation: Veterans Administration Medical Center, Salt Lake City, UT 84148.
authors.forename: J
authors.initials: J
authors.lastname: Burns
authors.forename: K
authors.initials: K
authors.lastname: Littlefield
authors.forename: J
authors.initials: J
authors.lastname: Gill
authors.forename: J L
authors.initials: JL
authors.lastname: Trotter
mesh_terms: D000942:Antigens, Bacterial / Q000276:immunology*; D001324:Autoantigens / Q000276:immunology*; D001427:Bacterial Toxins / Q000276:immunology*; D003602:Cytotoxicity, Immunologic; D006801:Humans; D008213:Lymphocyte Activation; D004676:Myelin Basic Protein / Q000276:immunology*; D011948:Receptors, Antigen, T-Cell / Q000235:genetics; D013211:Staphylococcus aureus / Q000276:immunology*; D013602:T-Lymphocytes, Cytotoxic / Q000276:immunology*
chemical_list: D000942:Antigens, Bacterial; D001324:Autoantigens; D001427:Bacterial Toxins; D004676:Myelin Basic Protein; D011948:Receptors, Antigen, T-Cell