Reciprocal regulation of plasmacytoid dendritic cells and monocytes during viral infection
- PMID: 11745405
- DOI: 10.1002/1521-4141(200112)31:12<3833::aid-immu3833>3.0.co;2-y
Reciprocal regulation of plasmacytoid dendritic cells and monocytes during viral infection
Abstract
Reciprocal regulation of opposing functions characterizes biological systems. We now show that adenovirus-infected plasmacytoid dendritic cells (PDC) inhibit monocyte to myeloid dendritic cell (MDC) differentiation and function, and that adenovirus-infected monocytes inhibit PDC type I interferon secretion. Adenovirus-infected PDC secreted IFN-alpha, beta and omega in an 86:2:1 ratio. PDC type I interferons inhibited MDC differentiation and function (reduced IL-12 secretion, IFN-gamma induction, MLR and CD40 expression, and increased CD1a(+)CD14(+) cells). Type I interferon receptor blocking antibody reversed all PDC effects, and recombinant IFN-alpha, beta or omega replicated all effects, except reduced CD40. Adenovirus-infected monocytes suppressed PDC type I interferon secretion, which was reversed with anti-IL-10 neutralizing antibodies. Exogenous IL-10 suppressed PDC type I interferon secretion without reducing PDC viability. Therefore, monocyte IL-10 regulates PDC type I interferon secretion, and PDC type I interferons inhibit MDC differentiation and function. Such reciprocal regulation of potentially opposing influences may help modulate anti-pathogen immunity.
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