title: Tolerance induction in TxXBT and TxXB mice.
abstract: Adult normal mice and those mice which had been thymectomized, X-irradiated, and reconstituted either with bone marrow cells and thymus cells (TxXBT) or with bone marrow cells along (TxXB), were given varying amounts (0.1-5 mg) of deaggregated soluble bovine serum albumin (sBSA). They were challenged 10 days later with an immunogenic form of BSA. TxXB mice were supplemented with normal thymus cells 3 days before the challenge. With any dose of sBSA, TxXBT and normal mice were made tolerant. Only 5 mg of sBSA, the highest dose in these experiments, was effective in inducing the tolerance in TxXB mice. The simultaneous administration of 5 mg of sBSA and 0.1 mg of alumprecipitated BSA plus 0.01 mg of endotoxin resulted in the priming in TxXBT mice but induced tolerance in TxXB mice. These results indicate that: (a) B-cell tolerance could be induced independently of the influence of T cells; (b) the tolerogen susceptibility of B cells may be lower than that of T cells; (c) such a weakly immunogenic agent as the mixture of tolerogen and immunogen could either activate the antibody response in the presence of T cells or induce B-cell tolerance in the absence of T cells.
mesh_terms: D000818:Animals; D000906:Antibodies / Q000032:analysis; D001402:B-Lymphocytes / Q000276:immunology; D001854:Bone Marrow Cells; D002417:Cattle; D004731:Endotoxins / Q000276:immunology; D006386:Hemagglutination Tests; D007108:Immune Tolerance; D007114:Immunization; D051379:Mice; D008815:Mice, Inbred Strains / Q000276:immunology*; D011829:Radiation Dosage; D012710:Serum Albumin, Bovine; D013601:T-Lymphocytes / Q000276:immunology; D013934:Thymectomy; D013950:Thymus Gland / Q000166:cytology
chemical_list: D000906:Antibodies; D004731:Endotoxins; D012710:Serum Albumin, Bovine