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+ Dendritic Cells Expressing Indoleamine 2,3-Dioxygenase1

*
Department of Experimental Medicine, University of Perugia, Perugia, Italy; and
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
-) and tolerogenic
(CD8
+) DC. By virtue of their respective actions on
CD8- and CD8+ DC, IL-12 and IFN-
have
functionally opposing effects on peptide presentation by the
CD8- DC subset, and IFN-
-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-
-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-
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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M. L. Belladonna, J.-C. Renauld, R. Bianchi, C. Vacca, F. Fallarino, C. Orabona, M. C. Fioretti, U. Grohmann, and P. Puccetti IL-23 and IL-12 Have Overlapping, but Distinct, Effects on Murine Dendritic Cells J. Immunol., June 1, 2002; 168(11): 5448 - 5454. [Abstract] [Full Text] [PDF] |
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