Fasciola hepatica glycoconjugates immuneregulate dendritic cells through the Dendritic Cell-Specific Intercellular adhesion molecule-3-Grabbing Non-integrin inducing T cell anergy

Sci Rep. 2017 Apr 24:7:46748. doi: 10.1038/srep46748.

Abstract

Dendritic cell-specific ICAM-3 grabbing non-integrin (DC-SIGN) expressed on a variety of DCs, is a C-type lectin receptor that recognizes glycans on a diverse range of pathogens, including parasites. The interaction of DC-SIGN with pathogens triggers specific signaling events that modulate DC-maturation and activity and regulate T-cell activation by DCs. In this work we evaluate whether F. hepatica glycans can immune modulate DCs via DC-SIGN. We demonstrate that DC-SIGN interacts with F. hepatica glycoconjugates through mannose and fucose residues. We also show that mannose is present in high-mannose structures, hybrid and trimannosyl N-glycans with terminal GlcNAc. Furthermore, we demonstrate that F. hepatica glycans induce DC-SIGN triggering leading to a strong production of TLR-induced IL-10 and IL-27p28. In addition, parasite glycans induced regulatory DCs via DC-SIGN that decrease allogeneic T cell proliferation, via the induction of anergic/regulatory T cells, highlighting the role of DC-SIGN in the regulation of innate and adaptive immune responses by F. hepatica. Our data confirm the immunomodulatory properties of DC-SIGN triggered by pathogen-derived glycans and contribute to the identification of immunomodulatory glyans of helminths that might eventually be useful for the design of vaccines against fasciolosis.

MeSH terms

  • Animals
  • Cell Adhesion Molecules
  • Clonal Anergy
  • Dendritic Cells / drug effects
  • Dendritic Cells / immunology*
  • Fasciola hepatica / chemistry*
  • Fasciola hepatica / immunology*
  • Glycoconjugates / isolation & purification
  • Glycoconjugates / metabolism*
  • Host-Pathogen Interactions*
  • Humans
  • Immunologic Factors / isolation & purification
  • Immunologic Factors / metabolism*
  • Lectins, C-Type
  • Receptors, Cell Surface
  • T-Lymphocytes / immunology*

Substances

  • Cell Adhesion Molecules
  • DC-specific ICAM-3 grabbing nonintegrin
  • Glycoconjugates
  • Immunologic Factors
  • Lectins, C-Type
  • Receptors, Cell Surface