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

Maturation, Activation, and Protection of Dendritic Cells Induced by Double-stranded RNA

By Marina Cella,* Mariolina Salio,* Yoichi Sakakibara,* Hanno Langen,Dagger Ilkka Julkunen,§ and Antonio Lanzavecchia*

From the * Basel Institute for Immunology, CH-4005 Basel, Switzerland; Dagger  Hoffmann-La Roche AG, CH-4002 Basel, Switzerland; and the § National Public Health Institute, FIN-00300, Helsinki, Finland

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.

Key words: dendritic cell maturation and activation;  influenza virus;  double-stranded RNA;  type I interferon;  MxA


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