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De novo-induced self-antigen-specific Foxp3+ regulatory T cells impair the accumulation of inflammatory dendritic cells in draining lymph nodes

De novo-induced self-antigen-specific Foxp3+ regulatory T cells impair the accumulation of inflammatory dendritic cells in draining lymph nodes

Journal of Immunology 194(12): 5812-5824

ISSN/ISBN: 0022-1767

PMID: 25948818

DOI: 10.4049/jimmunol.1500111

Foxp3(+) regulatory T cell (Treg)-based immunotherapy holds promise for autoimmune diseases. However, this effort has been hampered by major caveats, including the low frequency of autoantigen-specific Foxp3(+) Tregs and lack of understanding of their molecular and cellular targets, in an unmanipulated wild-type (WT) immune repertoire. In this study, we demonstrate that infusion of myelin in WT mice results in the de novo induction of myelin-specific Foxp3(+) Tregs in WT mice and amelioration of experimental autoimmune encephalomyelitis. Myelin-specific Foxp3(+) Tregs exerted their effect both by diminishing Ag-bearing inflammatory dendritic cell (iDC) recruitment to lymph nodes and by impairing their function. Transcriptome analysis of ex vivo-isolated Treg-exposed iDCs showed significant enrichment of transcripts involved in functional properties of iDCs, including chemotaxis-related genes. To this end, CCR7 expression by iDCs was significantly downregulated in tolerant mice and this was tightly regulated by the presence of IL-10. Collectively, our data demonstrate a novel model for deciphering the Ag-specific Foxp3(+) Treg-mediated mechanisms of tolerance and delineate iDCs as a Foxp3(+) Treg cellular target in unmanipulated mice.

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Accession: 057560859

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