Presently, new attention is given to type I interferons (IFNs) as essential factors linking innate and adaptive immunity. Several studies provided evidence about the importance of IFN-alpha in the differentiation of the Th1 subset, in the generation and activity of cytotoxic T lymphocytes, in the enhancement of a primary antibody response and in the activation of dendritic cells. Owing to their immunomodulatory properties, type I IFNs can represent good candidates to be used as adjuvants for vaccination. In the present review, we summarize recent studies in humans and in animal models, suggesting a possible application of type I IFNs as adjuvants for the development of more effective vaccines against infectious diseases and cancer.
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