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Dendritic Cell Activating Receptor 1 (DCAR1) Associates With FcεRIγ and Is Expressed by Myeloid Cell Subsets in the Rat

Authors
  • Daws, Michael R.1
  • Nakken, Britt1
  • Lobato-Pascual, Ana1
  • Josien, Régis2, 3
  • Dissen, Erik1
  • Fossum, Sigbjørn1
  • 1 Department of Molecular Medicine, Institute of Basic Medical Sciences, University of Oslo, Oslo , (Norway)
  • 2 Centre de Recherche en Transplantation et Immunologie UMR 1064, INSERM, Université de Nantes, Nantes , (France)
  • 3 Laboratoire d'Immunologie, CHU Nantes, Nantes , (France)
Type
Published Article
Journal
Frontiers in Immunology
Publisher
Frontiers Media SA
Publication Date
May 10, 2019
Volume
10
Identifiers
DOI: 10.3389/fimmu.2019.01060
PMID: 31134097
PMCID: PMC6522936
Source
PubMed Central
Keywords
License
Unknown

Abstract

Dendritic cell activating receptor-1 (DCAR1) is a cell-surface receptor encoded by the Antigen Presenting Lectin-like gene Complex (APLEC). We generated a mouse monoclonal antibody against rat DCAR1, and used this to characterize receptor expression and function. Rat DCAR1 was expressed on minor subsets of myeloid cells in lymphoid tissue, but was uniformly expressed at a high level by eosinophils, and at a low level by neutrophils. It was expressed by eosinophils in the peritoneal cavity and the lamina propria of the gut, and by subsets of macrophages or dendritic cells at these sites. Polarization of peritoneal macrophages showed that DCAR1 expression was absent on M1 macrophages, and increased on M2 macrophages. DCAR1 could be expressed as a homodimer and its associated with the activating adaptor protein FcεRIγ. This association allowed efficient phagocytosis of antibody-coated beads. Additionally, cross-linking of DCAR1 on the surface of rat eosinophils lead to production of reactive oxygen species. These data show that DCAR1 is an activating receptor. Its expression on M2 macrophages and eosinophils suggests that it may play a role in the immune response to parasites.

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