title: Urushiol (poison ivy)-triggered suppressor T cell clone generated from peripheral blood.
abstract: Allergic contact dermatitis to Toxicodendron radicans (poison ivy) is mediated by the hapten urushiol. An urushiol-specific, interleukin 2 (IL-2)-dependent T cell clone (RLB9-7) was generated from the peripheral blood of a patient with a history of allergic contact dermatitis to T. radicans. This clone proliferated specifically to both leaf extract and pure urushiol. Although the clone had the phenotype CD3+CD4+CD8+, proliferation to antigen was blocked by anti-CD8 and anti-HLA-A, B, C, but not by anti-CD4, suggesting that CD4 was not functionally associated with the T cell receptor. Furthermore, studies with antigen-presenting cells from MHC-typed donors indicated that the clone was MHC class 1 restricted. RLB9-7 was WT31 positive, indicating it bears the alpha beta T cell receptor. The clone lacked significant natural killer cell activity and produced only low levels of IL-2 or gamma-interferon upon antigen stimulation. Addition of RLB9-7 to autologous peripheral blood mononuclear cells in the presence of urushiol inhibited the pokeweed mitogen-driven IgG synthesis. This suppression was resistant to irradiation (2,000 rad) and was not seen when RLB9-7 was added to allogeneic cells, even in the presence of irradiated autologous antigen-presenting cells, suggesting that suppression was MHC restricted and not mediated by nonspecific soluble factors. However, RLB9-7 cells in the presence of urushiol inhibited the synthesis of tetanus toxoid-specific IgG by autologous lymphocytes, indicating that the suppression, although triggered specifically by urushiol, was nonspecific.
authors: Division of Tumor Immunology, Dana-Farber Cancer Institute, Boston, Massachusetts 02115.
authors: R S
authors: RS
authors: Kalish
authors: C
authors: C
authors: Morimoto
mesh_terms: D000918:Antibody Specificity; D000938:Antigen-Presenting Cells / Q000276:immunology; D002396:Catechols / Q000276:immunology*; D002999:Clone Cells / Q000276:immunology; D011040:Dermatitis, Toxicodendron / Q000097:blood / Q000276:immunology*; D000939:Epitopes / Q000276:immunology; D006801:Humans; D007074:Immunoglobulin G / Q000096:biosynthesis; D008213:Lymphocyte Activation / Q000187:drug effects; D008222:Lymphokines / Q000096:biosynthesis; D013602:T-Lymphocytes, Cytotoxic / Q000276:immunology*; D050378:T-Lymphocytes, Regulatory / Q000276:immunology*; D013745:Tetanus Toxoid / Q000276:immunology
chemical_list: D002396:Catechols; D000939:Epitopes; D007074:Immunoglobulin G; D008222:Lymphokines; D013745:Tetanus Toxoid; C003747:urushiol