title: Studies on interference with tolerance induction in T cells.
abstract: The mechanism of T-cell tolerance to a thymus-dependent antigen was examined, using the adjuvant polyadenylic-polyuridylic acid (poly A:U). In adoptive transfer experiments, thymus cells obtained from donor mice 2 days after treatment with a tolerogenic dose of bovine gamma-globulin (sBGG) did not cooperate with bone marrow (BM) cells in irradiated recipients challenged with aggregated BGG (aBGG). In contrast, thymus cells from donors given sBGG plus poly A:U retained their helper activity, as assayed by hemagglutination and rosette formation of spleen cells. The effect of poly A:U in preventing tolerance induction was also demonstrable in the cortisone-resistant population, in that thymus cells from cortisone-treated donors that had received sBGG and poly A:U retained their helper function. The presence of suppressor cells and the effect of poly A:U on their stimulation were also examined. sBGG-treated thymus cells suppressed the response of BGG-primed spleen cells in lethally irradiated mice, whereas thymus cells from donors treated with sBGG and poly A:U were not suppressive. These observations show that poly A:U prevents tolerance induction and the development of suppressor activity in T cells.
mesh_terms: D000818:Animals; D003348:Cortisone / Q000494:pharmacology; D005260:Female; D006386:Hemagglutination Tests; D007108:Immune Tolerance; D007116:Immunization, Passive; D007165:Immunosuppression Therapy; D008070:Lipopolysaccharides / Q000494:pharmacology; D008211:Lymphocyte Cooperation; D051379:Mice; D008807:Mice, Inbred BALB C; D011063:Poly A-U / Q000494:pharmacology; D013601:T-Lymphocytes / Q000276:immunology*
chemical_list: D008070:Lipopolysaccharides; D011063:Poly A-U; D003348:Cortisone