IFN-γ-rich environment programs dendritic cells toward silencing of cytotoxic immune responses

The unexplored potential of DC regulation by high dose IFN-, with novel mechanisms of immune regulation within a peak inflammatory environment. Lately, there is increasing evidence that emphasizes the regulatory functions of IFN-, which serve as negative-feedback mechanisms after, e.g., pathogen clearance, to prevent unnecessary tissue destruction. Inflammatory processes involving Th1 and cytotoxic responses are characterized by high, local IFN- concentrations, followed by resolution and immune silencing. Although this is a well-known course of events, extensive attempts to address potential differential effects of IFN- in the manner of its availability (quantitatively) in the environment do not exist. We demonstrate that high doses of IFN- do not induce DC maturation and activation but instead, induce specific regulatory characteristics in DCs. Considering their phenotype, high doses of IFN- extensively induce the expression of ILT-4 and HLA-G inhibitory molecules. Interestingly, the well-known priming effect of IFN- for IL-12p70 production is lost at these conditions, and the DC cytokine profile is switched toward an increased IL-10/IL-12p70 ratio upon subsequent stimulation with CD40L. Furthermore, such DCs are capable of silencing cellular immune responses and activation of cytotoxic CD8(+) T lymphocytes, resulting in reduced cell proliferation and down-regulation of granzyme B expression. Additionally, we find that in this manner, immune regulation mediated by IFN- is not mainly a result of increased enzymatic activity of IDO in DCs but rather, a result of HLA-G signaling, which can be reversed by blocking mAb. Altogether, our results identify a novel mechanism by which a Th1-like environment programs the functional status of DCs to silence ongoing cytotoxic responses to prevent unwanted tissue destruction and inflammation.