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* Laboratory of Virology, Istituto Superiore di Sanità, Rome, Italy; and
Viral Oncology, Centre National de la Recherche Scientifique, Villejuif, France
Type I IFNs are modulators of myeloid dendritic cell (DC) development, survival, and functional activities. Here we monitored the signal transduction pathway underlying type I IFN biological activities during in vitro maturation of human monocyte-derived DCs. IFN-inducible tyrosine phosphorylation of STAT family members was severely impaired upon LPS-induced DC maturation. This correlated with a marked reduction of both type I IFN receptor chains occurring as early as 4 h after LPS treatment. The reduced receptor expression was a post-transcriptional event only partially mediated by ligand-induced internalization/degradation. In fact, although an early and transient production of type I IFNs was observed after LPS treatment, its neutralization was not sufficient to completely rescue IFN receptor expression. Notably, neutralization of LPS-induced, endogenous type I IFNs did not interfere with the acquisition of a fully mature surface phenotype, nor did it have a significant effect on the allostimulatory properties of LPS-stimulated DCs. Overall, these data indicate that DCs strictly modulate their responsiveness to type I IFNs as part of their maturation program, underlining the importance of the IFN system in the regulation of DC physiology.
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