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- W2023446811 abstract "Neonatal thymectomy prevents tolerance induction with bovine serum albumin (BSA) in Wistar Furth (WF) rats whose thymus-derived (T) cell deficit is reconstituted with adult nonadherent peripheral blood lymphocytes (PBL). Sham-thymectomized (STx) rats given PBL become tolerant. To establish whether the adult T cells become tolerant in STx rats, their carrier-reactivity was studied in a cooperative immune response following challenge with methylated BSA (mBSA). The results indicate that carrier-reactive cells, derived from PBL, do become tolerant of BSA in the presence, but not in the absence, of the thymus. To determine whether thymic function during tolerance induction is mediated by suppressor T cells, attempts were made to replace the thymus with various populations of thymocytes or lymphoid cells from neonatal or adult normal rats or neonatal BSA-injected rats. No cell population tried could substitute for the thymus during tolerance induction. In addition, it was found that BSA-tolerant rats with intact thymi do not contain either nonspecific suppressor cells whose activity can be boosted with mBSA or specific suppressor activity demonstrable on transfer to normal rats. Timed thymectomy experiments showed that the thymus is required for more than 2, but less than 5 to 7 days after tolerogen injection for significant tolerance induction. These results imply that the thymus itself is necessary for tolerance induction in a peripheral T-cell population and that its effect is not mediated by suppressor cells. It is suggested that peripheral T helper cells may periodically recirculate through the thymus, at least in young rats, and become tolerant of antigen complexed with Ia antigens in the thymic epithelium. Such a mechanism may be of great importance in the development of self-recognition." @default.
- W2023446811 created "2016-06-24" @default.
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- W2023446811 date "1980-01-01" @default.
- W2023446811 modified "2023-10-18" @default.
- W2023446811 title "Thymus dependency of neonatal tolerance induction in the absence of detectable suppressor cells" @default.
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- W2023446811 doi "https://doi.org/10.1016/0008-8749(80)90062-3" @default.
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