title: S-antigen specific T cell clones from a patient with Behçet's disease.
abstract: The isolation and characterisation of T cell clones or lines specific to retinal antigens are valuable tools to clarify the underlying mechanisms of autoimmunity to retinal antigens as a contributing factor in ocular inflammation. Patients with Behçet's disease have been reported to be sensitised to S-antigen (S-Ag). In the present study, four T cell clones established from the peripheral blood of a patient with Behçet's disease were analysed. A CD4+ T cell clone (clone 2) and a CD8+ T cell clone (clone 10) proliferated specifically to bovine S-Ag. Although these S-Ag specific T cell clones proliferated vigorously to the intact antigen, their responses to S-Ag derived synthetic peptides M and G were weak, suggesting that the sites of human T cell recognition of S-Ag may be different from those established in the experimental model. The proliferative responses of both clones (2 and 10) were inhibited by anti-HLA-DR monoclonal antibody but not by anti-HLA-class 1 monoclonal antibody. The other two clones studied, clones 6 and 30, were CD3+, CD4-, CD8-, and they did not proliferate specifically to S-Ag. Clone 6 expressed gamma delta T cell receptors (TCR) and showed non-specific cytotoxic activity toward K562 and Daudi cell lines. Clone 30 expressed alpha beta TCR, and was devoid of cytotoxic activity. Human T cell lines and clones specific to retinal antigens will provide the framework necessary to examine the events that lead to ocular inflammation.
authors.affiliation: Division of Ophthalmology, School of Medicine, University of Sao Paulo, Brazil.
authors.forename: J H
authors.initials: JH
authors.lastname: Yamamoto
authors.forename: Y
authors.initials: Y
authors.lastname: Fujino
authors.forename: C
authors.initials: C
authors.lastname: Lin
authors.forename: M
authors.initials: M
authors.lastname: Nieda
authors.forename: T
authors.initials: T
authors.lastname: Juji
authors.forename: K
authors.initials: K
authors.lastname: Masuda
mesh_terms: D000328:Adult; D000941:Antigens / Q000032:analysis* / Q000737:chemistry; D019393:Arrestin; D001324:Autoantigens / Q000032:analysis*; D001528:Behcet Syndrome / Q000276:immunology*; D015704:CD4 Antigens / Q000276:immunology; D016827:CD8 Antigens / Q000276:immunology; D002240:Carbohydrate Sequence; D002455:Cell Division; D002999:Clone Cells; D003602:Cytotoxicity, Immunologic; D000939:Epitopes / Q000032:analysis; D005136:Eye Proteins / Q000032:analysis* / Q000737:chemistry; D006684:HLA-DR Antigens / Q000276:immunology; D006801:Humans; D008297:Male; D008969:Molecular Sequence Data; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D000941:Antigens; D019393:Arrestin; D001324:Autoantigens; D015704:CD4 Antigens; D016827:CD8 Antigens; D000939:Epitopes; D005136:Eye Proteins; D006684:HLA-DR Antigens