Abstract
Originally identified as antiviral substances produced by infected cells, type I interferons (IFN-I) are now known to have a wide range of additional activities within both the innate and adaptive immune response. Here we review properties of IFN-I contributing to their ‘natural immune adjuvant’ character, and their important role for the function of complete Freund's adjuvant (CFA) and the TLR9-dependent immune adjuvant IC31. We show data to demonstrate that treatment with IFN-I boosts the ability of vaccine/adjuvant combinations to induce peptide-specific CTL in both young and old mice. We view these findings in the perspective of previous clinical applications of IFN-I for vaccination.
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