Abstract
Mice lacking the transcription factor Foxp3 (Foxp3−) lack regulatory T (Treg) cells and develop fatal autoimmune pathology. In Foxp3− mice, many activated effector T cells express self-reactive T cell receptors that are expressed in Treg cells in wild-type mice. Thus, in wild-type mice, most self-reactive thymocytes escaping negative selection are diverted into the Treg lineage, and whether Treg cells are critical in self-tolerance in wild-type mice remains unknown. Here, acute in vivo ablation of Treg cells demonstrated a vital function for Treg cells in neonatal and adult mice. We suggest that self-reactive T cells are continuously suppressed by Treg cells and that when suppression is relieved, self-reactive T cells become activated and facilitate accelerated maturation of dendritic cells.
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Change history
24 December 2006
In the version of this article initially published online, a name in the first sentence of Acknowledgments is incorrect. The correct name is ‘M. Bevan’. The error has been corrected for all versions of the article.
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Acknowledgements
We thank D. Liggit for assistance with the analysis of histopathology; A. Gall, L. Karpik, T. Chu, K. Forbush, P. deRoos and M. Schwartz for assistance; R. Setoguchi and M. Bevan (University of Washington) for SMARTA Rag2−/− mice; and members of the Rudensky lab for discussions. The CD11c-DTR-GFP plasmid was a gift from R. Lang (Children's Hospital, Cincinnati, Ohio). Suported by the Howard Hughes Medical Institute (A.Y.R.), Cancer Research Institute (J.M.K.) and US National Institutes of Health (A.Y.R.).
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Supplementary information
Supplementary Fig. 1
Generation of the Foxp3DTR knockin allele. (PDF 827 kb)
Supplementary Fig. 2
Increased generation of myeloid dendritic cells in response to Treg cell elimination. (PDF 225 kb)
Supplementary Fig. 3
Increased expression of CD40L, RANKL, GM-CSF, IL-3 by CD4+ Foxp3− T cells after Treg cell elimination. (PDF 328 kb)
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Kim, J., Rasmussen, J. & Rudensky, A. Regulatory T cells prevent catastrophic autoimmunity throughout the lifespan of mice. Nat Immunol 8, 191–197 (2007). https://doi.org/10.1038/ni1428
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DOI: https://doi.org/10.1038/ni1428