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The Journal of Immunology, 2001, 167: 708-714.
Copyright © 2001 by The American Association of Immunologists

IL-6 Inhibits the Tolerogenic Function of CD8{alpha}+ Dendritic Cells Expressing Indoleamine 2,3-Dioxygenase1

Ursula Grohmann*, Francesca Fallarino*, Roberta Bianchi*, Maria Laura Belladonna*, Carmine Vacca*, Ciriana Orabona*, Catherine Uyttenhove{dagger}, Maria Cristina Fioretti* and Paolo Puccetti2,*

* Department of Experimental Medicine, University of Perugia, Perugia, Italy; and {dagger} Ludwig Institute for Cancer Research, Brussels, Belgium

The outcome of dendritic cell (DC) presentation of tumor and/or self peptides, including P815AB (a tumor peptide of murine mastocytoma cells) and NRP-A7 (a synthetic peptide mimotope recognized by diabetogenic T cells), may depend on a balance between the activities of immunogenic (CD8{alpha}-) and tolerogenic (CD8{alpha}+) DC. By virtue of their respective actions on CD8- and CD8+ DC, IL-12 and IFN-{gamma} have functionally opposing effects on peptide presentation by the CD8- DC subset, and IFN-{gamma}-activated CD8+ DC mediate tolerogenic effects that prevail over the adjuvant activity of IL-12 on CD8- DC. We have previously shown that CD40 ligation abrogates the tolerogenic potential of CD8+ DC, an effect associated with an impaired capacity of the CD40-modulated and IFN-{gamma}-treated DC to degrade tryptophan and initiate T cell apoptosis in vitro. We report here that IL-6 may both replace (upon administration of the recombinant cytokine) and mediate (as assessed by the use of neutralizing Abs) the effect of CD40 ligation in ablating the tolerogenic activity of CD8+ DC. The activity of IL-6 includes down-regulation of IFN-{gamma}R expression in the CD8+ DC subset and correlates to a reduced ability of these cells to metabolize tryptophan and initiate T cell apoptosis in vitro.




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