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Divisions of Endocrinology and Basic Sciences, Faculty of Medicine, Memorial University of Newfoundland, St. John’s, NL, Canada
Ex vivo treatment of bone marrow-derived dendritic cells (DCs) with TNF-
has been previously shown to induce partial maturation of DCs that are able to suppress autoimmunity. In this study, we demonstrate that i.v. administration of TNF--treated, semimature DCs pulsed with thyrogloblin (Tg), but not with OVA Ag, inhibits the subsequent development of Tg-induced experimental autoimmune thyroiditis (EAT) in CBA/J mice. This protocol activates CD4+CD25+ T cells in vivo, which secrete IL-10 upon specific recognition of Tg in vitro and express regulatory T cell (Treg)-associated markers such as glucocorticoid-induced TNFR, CTLA-4, and Foxp3. These CD4+CD25+ Treg cells suppressed the proliferation and cytokine release of Tg-specific, CD4+CD25– effector cells in vitro, in an IL-10-independent, cell contact-dependent manner. Prior adoptive transfer of the same CD4+CD25+ Treg cells into CBA/J hosts suppressed Tg-induced EAT. These results demonstrate that the tolerogenic potential of Tg-pulsed, semimature DCs in EAT is likely to be mediated through the selective activation of Tg-specific CD4+CD25+ Treg cells and provide new insights for the study of Ag-specific immunoregulation of autoimmune diseases.
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