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Modulation of Th1 Activation and Inflammation by the NF-B Repressor Foxj1
Ling Lin,1Melanie S. Spoor,2Andrea J. Gerth,1Steven L. Brody,2Stanford L. Peng1,3*
Forkhead transcription factors play key roles in the regulationof immune responses. Here, we identify a role for one memberof this family, Foxj1, in the regulation of T cell activationand autoreactivity. Foxj1 deficiency resulted in multiorgansystemic inflammation, exaggerated Th1 cytokine production,and T cell proliferation in autologous mixed lymphocyte reactions.Foxj1 suppressed NF-B transcription activity in vitro, and Foxj1-deficientT cells possessed increased NF-B activity in vivo, correlatingwith the ability of Foxj1 to regulate IB proteins, particularlyIBß. Thus, Foxj1 likely modulates inflammatory reactionsand prevents autoimmunity by antagonizing proinflammatory transcriptionalactivities. These results suggest a potentially general rolefor forkhead genes in the enforcement of lymphocyte quiescence.
1 Division of Rheumatology, Department of Internal Medicine, Washington University School of Medicine, 660 South Euclid Avenue, St. Louis, MO 63110, USA. 2 Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, Washington University School of Medicine, 660 South Euclid Avenue, St. Louis, MO 63110, USA. 3 Department of Pathology and Immunology, Washington University School of Medicine, 660 South Euclid Avenue, St. Louis, MO 63110, USA.
* To whom correspondence should be addressed. E-mail: speng{at}im.wustl.edu
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