The Journal of Experimental Medicine
ThymUS '08
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Published online 30 June 2003 doi:10.1084/jem.20030633
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© Rockefeller University Press, 0022-1007/2003/7/153 $5.00
The Journal of Experimental Medicine, Volume 198, Number 1, 153-160

A Defect in Tryptophan Catabolism Impairs Tolerance in Nonobese Diabetic Mice

Ursula Grohmann, Francesca Fallarino, Roberta Bianchi, Ciriana Orabona, Carmine Vacca, Maria C. Fioretti and Paolo Puccetti

Department of Experimental Medicine, University of Perugia, Perugia 06126, Italy

Address correspondence to Ursula Grohmann, Section of Pharmacology, Dept. of Experimental Medicine, University of Perugia, 06126 Perugia, Italy. Phone: 39-075-585-7460; Fax: 39-075-585-7473; E-mail: ugrohmann{at}tin.it

The predisposition of nonobese diabetic (NOD) mice to develop autoimmunity reflects deficiencies in both peripheral and central tolerance. Several defects have been described in these mice, among which aberrant antigen-presenting cell function and peroxynitrite formation. Prediabetes and diabetes in NOD mice have been targeted with different outcomes by a variety of immunotherapies, including interferon (IFN)-{gamma}. This cytokine may be instrumental in specific forms of tolerance by virtue of its ability to activate immunosuppressive tryptophan catabolism. Here, we provide evidence that IFN-{gamma} fails to induce tolerizing properties in dendritic cells from highly susceptible female mice early in prediabetes. This effect is associated with impaired tryptophan catabolism, is related to transient blockade of the Stat1 pathway of intracellular signaling by IFN-{gamma}, and is caused by peroxynitrite production. However, the use of a peroxynitrite inhibitor can rescue tryptophan catabolism and tolerance in those mice. This is the first report of an experimental autoimmune disease in which defective tolerance is causally linked to impaired tryptophan catabolism.

Key Words: autoimmunity • indoleamine 2,3-dioxygenase • dendritic cells • tolerance • NOD mice


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