The Journal of Experimental Medicine
VeriKine-HS Human IFN-Beta
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Published 4 April 2005. doi:10.1084/jem.20042276
Rockefeller University Press, 0022-1007 $8.00
JEM, Volume 201, Number 7, 1061-1067
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BRIEF DEFINITIVE REPORT

TGF-ß1 maintains suppressor function and Foxp3 expression in CD4+CD25+ regulatory T cells

Julien C. Marie1, John J. Letterio3, Marc Gavin1, and Alexander Y. Rudensky1,2

1 Department of Immunology, University of Washington, Seattle, WA 98195
2 Howard Hughes Medical Institute, University of Washington, Seattle, WA 98195
3 Laboratory of Cell Regulation and Carcinogenesis, National Cancer Institute, Bethesda, MD 20892

CORRESPONDENCE Alexander Y. Rudensky: aruden{at}u.washington.edu

Transforming growth factor (TGF)-ß1 is a major pluripotential cytokine with a pronounced immunosuppressive effect and its deficiency results in lethal autoimmunity in mice. However, mechanisms of its immunosuppressive action are not completely understood. Here, we report that TGF-ß1 supports the maintenance of Foxp3 expression, regulatory function, and homeostasis in peripheral CD4+CD25+ regulatory T (T reg) cells, but is not required for their thymic development. We found that in 8–10-d-old TGF-ß1–deficient mice, peripheral, but not thymic, T reg cells are significantly reduced in numbers. Moreover, our experiments suggest that a defect in TGF-ß–mediated signaling in T reg cells is associated with a decrease in Foxp3 expression and suppressor activity. Thus, our results establish an essential link between TGF-ß1 signaling in peripheral T reg cells and T reg cell maintenance in vivo.



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