title: Streptococcal-related antigens stimulate production of IL6 and interferon-gamma by T cells from patients with Behcet's disease.
abstract: Greater attention has been recently paid to the role of certain strains of streptococcus as an etiologic agent of Behçet's disease, in which T cell abnormalities are considered to be involved. We therefore examined whether T cells from patients with Behçet's disease might to be stimulated by Streptococcus sanguis-related antigen (RRE KTH-1 antigens). T cells from 17 patients with Behcet's disease, but not those from 13 healthy individuals or from 13 patients with other rheumatic diseases, were stimulated to produce greater amounts of interleukin 6 (IL6) by addition of RRE KTH-1 antigens [stimulation index: 3.96 +/- 0.56 and 1.35 +/- 0.28 or 1.83 +/- 0.43 (mean +/- SEM), respectively]. The IL6 production by T cells required the presence of either fresh or paraformaldehyde-fixed monocytes. The enhancement of T cell IL6 production was not related to the presence of HLA-B51, which has been shown to be frequently associated with Behçet's disease. These results indicate that T cells from patients with Behçet's disease are stimulated by streptococcal antigens to produce IL6 through T cell-monocyte interactions in which binding of the antigens to monocytes, but not necessarily processing of the antigens by monocytes, is involved. Moreover, RRE KTH-1 antigens as well as Escherichia coli-derived antigens also enhanced the production of interferon-gamma by T cells from patients with Behçet's disease. The data thus suggest that T cell hypersensitivity to several bacterial antigens may play a central role in the pathogenesis of Behçet's disease.
authors.affiliation: Department of Medicine and Physical Therapy, University of Tokyo School of Medicine, Japan.
authors.forename: S
authors.initials: S
authors.lastname: Hirohata
authors.forename: H
authors.initials: H
authors.lastname: Oka
authors.forename: Y
authors.initials: Y
authors.lastname: Mizushima
mesh_terms: D000328:Adult; D000942:Antigens, Bacterial / Q000276:immunology; D001528:Behcet Syndrome / Q000276:immunology*; D005260:Female; D015235:HLA-B Antigens / Q000276:immunology; D059949:HLA-B51 Antigen; D006801:Humans; D016130:Immunophenotyping; D007371:Interferon-gamma / Q000096:biosynthesis*; D015850:Interleukin-6 / Q000096:biosynthesis*; D008297:Male; D008875:Middle Aged; D013298:Streptococcus sanguis / Q000276:immunology*; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D000942:Antigens, Bacterial; D015235:HLA-B Antigens; D059949:HLA-B51 Antigen; D015850:Interleukin-6; D007371:Interferon-gamma