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An effective type I interferon (IFN-alpha/beta) response is critical for the control of many viral infections. Here we show that in vesicular stomatitis virus (VSV)-infected mouse embryonic fibroblasts (MEFs) the production of IFN-alpha is dependent on type I IFN receptor (IFNAR) triggering, whereas in infected mice early IFN-alpha production is IFNAR independent. In VSV-infected mice type I IFN is produced by few cells located in the marginal zone of the spleen. Unlike other dendritic cell (DC) subsets, FACS((R))-sorted CD11c(int)CD11b(-)GR-1(+) DCs show high IFN-alpha expression, irrespective of whether they were isolated from VSV-infected IFNAR-competent or -deficient mice. Thus, VSV preferentially activates a specialized DC subset presumably located in the marginal zone to produce high-level IFN-alpha largely independent of IFNAR feedback signaling.

Virus-induced Interferon α Production by a Dendritic Cell Subset in the Absence of Feedback Signaling In Vivo