The Journal of Experimental Medicine
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Published 17 October 2005. doi:10.1084/jem.20050157
Rockefeller University Press, 0022-1007 $8.00
JEM, Volume 202, Number 8, 1141-1151
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ARTICLE

The Scurfy mutation of FoxP3 in the thymus stroma leads to defective thymopoiesis

Xing Chang1, Jian Xin Gao1, Qi Jiang2, Jing Wen1, Nick Seifers2, Lishan Su2, Virginia L. Godfrey3, Tao Zuo1, Pan Zheng1, and Yang Liu1

1 Division of Cancer Immunology, Department of Pathology and Comprehensive Cancer Center, Ohio State University Medical Center, Columbus, OH 43210
2 Department of Microbiology and Immunology, University of North Carolina, Chapel Hill, NC 27599
3 Department of Pathology and Laboratory Medicine, University of North Carolina, Chapel Hill, NC 27599

CORRESPONDENCE Yang Liu: liu-3{at}medctr.osu.edu OR Jian Xin Gao: gao-3{at}medctr.osu.edu

The Scurfy mutation of the FoxP3 gene (FoxP3sf) in the mouse and analogous mutations in human result in lethal autoimmunity. The mutation of FoxP3 in the hematopoietic cells impairs the development of regulatory T cells. In addition, development of the Scurfy disease also may require mutation of the gene in nonhematopoietic cells. The T cell–extrinsic function of FoxP3 has not been characterized. Here we show that the FoxP3sf mutation leads to defective thymopoiesis, which is caused by inactivation of FoxP3 in the thymic stromal cells. FoxP3 mutation also results in overexpression of ErbB2 in the thymic stroma, which may be involved in defective thymopoiesis. Our data reveal a novel T cell–extrinsic function of FoxP3. In combination, the T cell–intrinsic and –extrinsic defects provide plausible explanation for the severity of the autoimmune diseases in the scurfy mice and in patients who have immunodysregulation, polyendocrinopathy, enteropathy, and X-linked syndrome.


Abbreviations used: BrdU, nucleotide analog bromodeoxyuridine; DN, double negative; DP, double positive; IPEX, immunodysregulation, polyendocrinopathy, enteropathy, X-linked syndrome; sf, scurfy; SP, single positive; spf, sparse fur; T reg, regulatory T cell.


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