Linked Suppression in Peripheral T Cell Tolerance to the House Dust Mite Derived Allergen Der p 1
- 1 April 1999
- journal article
- Published by S. Karger AG in International Archives of Allergy and Immunology
- Vol. 118 (2-4) , 122-124
- https://doi.org/10.1159/000024046
Abstract
Background: Peripheral tolerance is required to maintain balance within the immune system. A feature of peripheral tolerance is linked suppression, in which tolerance induced to a single T cell epitope inhibits the response to all epitopes in the same protein. It is suggested that this phenomenon is mediated by regulatory T cells through either the activity of immunopressive cytokines or direct cell contact. In previous experiments we failed to detect inhibitory cytokines when T cells from mice rendered tolerant by intranasal delivery of the immunodominant peptide of Der p 1 (p 1, 110–131) were restimulated with peptide in vitro. Therefore, the aim of this study was to determine if cognate interactions between T cells mediated by Notch/Delta signaling induce and maintain peripheral T cell tolerance. Methods: Using in situ hybridization and viral mediated gene transfer, the expression and function of Delta1 were investigated in a murine model of T cell tolerance to Der p 1 in vivo. Results: Delta1 expression is increased on peripheral T cells during the induction of tolerance with high–dose peptide delivered intranasally and when tolerant animals are rechallenged under immunogenic conditions. Peptide p 1, 110–131–specific CD4+ T cells transfected with Delta1 inhibited the response of antigen–primed T cells and induced linked suppression. Conclusions: High–dose peptide delivered intranasally induces transient expression of Delta 1 on inhibitory CD4+ T cells. Ligation of the Notch1 receptor on neighbouring T cells by Delta1+ regulatory T cells inhibits clonal expansion of the former and mediates linked suppression.Keywords
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