title: Identification of murine T cells reactive with the bacterial superantigen Yersinia pseudotuberculosis-derived mitogen (YPM) and factors involved in YPM-induced toxicity in mice.
abstract: We previously reported that Yersinia pseudotuberculosis-derived mitogen (YPM) acts as a superantigen to human T cells. In this study, we assessed the superantigenicity and toxicity of YPM using murine experimental models. YPM activated T cells to produce interleukin-2 in a major histocompatibility complex class II molecule-dependent manner. The T-cell blasts induced by YPM expressed T-cell receptor (TCR) beta-chain variable region (Vbeta)7, Vbeta8.1, Vbeta8.2 and Vbeta8.3. The injection of YPM into mice pre-sensitized with D-galactosamine induced lethal shock. This shock was blocked by the injection of monoclonal antibodies (mAbs) to CD4, TCR Vbeta7 plus Vbeta8, tumor necrosis factor-alpha (TNF-alpha) and interferon-gamma (IFN-gamma), but not by injection to CD8 or unrelated Vbeta. These results indicate that YPM-induced shock requires the presence of CD4+ T cells bearing TCR Vbeta7 and Vbeta8, and that endogenous TNF-alpha and IFN-gamma mediate the lethal effects.
authors.affiliation: Department of Microbiology and Immunology, Tokyo Women's Medical College, Shinjuku-ku, Japan.
authors.forename: T
authors.initials: T
authors.lastname: Miyoshi-Akiyama
authors.forename: W
authors.initials: W
authors.lastname: Fujimaki
authors.forename: X J
authors.initials: XJ
authors.lastname: Yan
authors.forename: J
authors.initials: J
authors.lastname: Yagi
authors.forename: K
authors.initials: K
authors.lastname: Imanishi
authors.forename: H
authors.initials: H
authors.lastname: Kato
authors.forename: K
authors.initials: K
authors.lastname: Tomonari
authors.forename: T
authors.initials: T
authors.lastname: Uchiyama
mesh_terms: D000818:Animals; D019138:Antibodies, Blocking / Q000276:immunology; D001426:Bacterial Proteins / Q000276:immunology*; D015704:CD4 Antigens / Q000276:immunology; D016827:CD8 Antigens / Q000276:immunology; D003602:Cytotoxicity, Immunologic; D005260:Female; D005688:Galactosamine / Q000494:pharmacology; D000949:Histocompatibility Antigens Class II / Q000276:immunology; D007371:Interferon-gamma / Q000276:immunology; D007376:Interleukin-2 / Q000378:metabolism; D008213:Lymphocyte Activation; D008297:Male; D051379:Mice; D008810:Mice, Inbred C57BL; D016693:Receptors, Antigen, T-Cell, alpha-beta / Q000276:immunology; D018089:Superantigens / Q000276:immunology*; D013601:T-Lymphocytes / Q000276:immunology*; D014409:Tumor Necrosis Factor-alpha / Q000276:immunology
chemical_list: D019138:Antibodies, Blocking; D001426:Bacterial Proteins; D015704:CD4 Antigens; D016827:CD8 Antigens; D000949:Histocompatibility Antigens Class II; D007376:Interleukin-2; D016693:Receptors, Antigen, T-Cell, alpha-beta; D018089:Superantigens; D014409:Tumor Necrosis Factor-alpha; C093313:Yersinia pseudotuberculosis-derived mitogen; D005688:Galactosamine; D007371:Interferon-gamma