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J. Exp. Med.,
Volume 189, Number 5, March 1, 1999 821-829
By

From the * Basel Institute for Immunology, CH-4005 Basel, Switzerland; The initiation of an immune response is critically dependent on the activation of dendritic cells
(DCs). This process is triggered by surface receptors specific for inflammatory cytokines or for conserved patterns characteristic of infectious agents. Here we show that human DCs are activated by influenza virus infection and by double-stranded (ds)RNA. This activation results not
only in increased antigen presentation and T cell stimulatory capacity, but also in resistance to
the cytopathic effect of the virus, mediated by the production of type I interferon, and upregulation of MxA. Because dsRNA stimulates both maturation and resistance, DCs can serve as altruistic antigen-presenting cells capable of sustaining viral antigen production while acquiring
the capacity to trigger naive T cells and drive polarized T helper cell type 1 responses.
Hoffmann-La Roche AG,
CH-4002 Basel, Switzerland; and the § National Public Health Institute, FIN-00300, Helsinki,
Finland
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