Abstract
Plasmacytoid dendritic cells (PDCs) are a subset of dendritic cells present in human blood and inflamed lymph nodes. Here we show that blood PDCs, when stimulated with influenza virus and CD40L in vitro, undergo a maturation process characterized by up-regulation of major histocompatibility complex proteins and adhesion and costimulatory molecules. In addition, PDCs down-regulate CXCR3 and L-selectin, which mediate migration and homing of these cells into the lymph node. Mature PDCs efficiently stimulate T cells and drive a potent TH1 polarization in vitro, which is mediated by the synergistic effect of interleukin 12 and type I interferon. In vivo, mature PDCs are found in secondary lymphoid organs, where they represent the principal source of type I interferon during inflammation. Thus, PDCs probably participate in antiviral and pro-inflammatory responses, rather than in TH2 polarization and tolerance induction.
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Acknowledgements
We thank M. Dessing, T. Hayden and H. Kohler for cell sorting assistance; P. Lane, H. Gallati and I. Julkunen for reagents; M. Kopf, F. Sallusto and R. Ettinger for reading the manuscript. The Basel Institute for Immunology was founded and is supported by Hoffmann-La Roche Ltd, CH-4002 Basel. Part of these results were presented at the Workshop on Lymphoid Organogenesis held in Basel (November 5–6, 1999).
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Cella, M., Facchetti, F., Lanzavecchia, A. et al. Plasmacytoid dendritic cells activated by influenza virus and CD40L drive a potent TH1 polarization. Nat Immunol 1, 305–310 (2000). https://doi.org/10.1038/79747
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DOI: https://doi.org/10.1038/79747