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      Viral infection and Toll-like receptor agonists induce a differential expression of type I and lambda interferons in human plasmacytoid and monocyte-derived dendritic cells.

      European Journal of Immunology
      Cell Line, Cells, Cultured, DNA-Binding Proteins, biosynthesis, genetics, Dendritic Cells, classification, immunology, virology, Gene Expression, Humans, Influenza A virus, physiology, Interferon Regulatory Factor-7, Interferon Regulatory Factors, Interferon Type I, Interferons, Membrane Glycoproteins, agonists, Monocytes, cytology, RNA, Messenger, Receptors, Cell Surface, Toll-Like Receptor 3, Toll-Like Receptor 4, Toll-Like Receptor 9, Toll-Like Receptors, Transcription Factors

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          Abstract

          In humans, the type I interferon (IFN) family consists of 13 IFN-alpha subtypes, IFN-beta and IFN-omicron the newly discovered IFN-like family consists of IFN-lambda1, -lambda2 and -lambda3. We have investigated the expression of type I and lambda IFN genes following virus infections or Toll-like receptor (TLR) triggering in monocyte-derived DC (MDDC) and plasmacytoid DC (pDC). We found that all IFN-alpha, -beta, -omicron and -lambda subtypes are expressed in influenza-virus-infected MDDC or pDC. Conversely, differential type I IFN gene transcription was induced in MDDC and pDC stimulated by specific TLR agonists. TLR-9 stimulation by CpG DNA induced the expression of all IFN-alpha, -beta, -omicron and -lambda subtypes in pDC, whereas TLR-4 stimulation by LPS, or TLR-3 stimulation by poly I:C, induced only IFN-beta and IFN-lambda gene expression in MDDC. The expression pattern of IFN regulatory factor (IRF)-5 and IRF-7 in MDDC and pDC was also determined. IRF-5 was constitutively expressed in the two DC subsets whereas IRF-7 was constitutive in pDC but its expression was induced along MDDC maturation. Overall, our data indicate that the coordinated expression of IFN-lambda with IFN-beta would be of crucial importance for the maturation of DC.

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