title: Demonstration of Ia-like antigens on T lymphocytes in lesions of psoriasis, lichen planus and discoid lupus erythematosus.
abstract: A combined indirect immunofluorescence technique with a murine monoclonal antibody against human Ia-like antigens (OKIal) and an IgG F(ab')2 preparation of a rabbit anti-T lymphocyte serum was used to study Ia-like antigens on T lymphocytes in skin lesions of psoriasis, lichen planus and discoid lupus erythematosus. The majority of the T lymphocytes in the various skin lesions expressed Ia-like antigens. T lymphocytes expressing Ia-like antigens were also demonstrated in the dermis and the epidermis in sections of unaffected skin, although of a markedly lower proportion than in affected skin. The results may indicate that the T lymphocytes in these skin lesions are activated cells involved in cell-mediated immune reactions.
mesh_terms: D006681:HLA-D Antigens; D006684:HLA-DR Antigens; D000949:Histocompatibility Antigens Class II / Q000032:analysis*; D006801:Humans; D007111:Immunity, Cellular; D007140:Immunoglobulin Fab Fragments / Q000032:analysis; D007074:Immunoglobulin G / Q000032:analysis; D008010:Lichen Planus / Q000276:immunology; D008179:Lupus Erythematosus, Discoid / Q000276:immunology; D011565:Psoriasis / Q000276:immunology; D012871:Skin Diseases / Q000276:immunology*; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D006681:HLA-D Antigens; D006684:HLA-DR Antigens; D000949:Histocompatibility Antigens Class II; D007140:Immunoglobulin Fab Fragments; D007074:Immunoglobulin G