CLEC4F is an inducible C-type lectin in F4/80-positive cells and is involved in alpha-galactosylceramide presentation in liver

PLoS One. 2013 Jun 6;8(6):e65070. doi: 10.1371/journal.pone.0065070. Print 2013.

Abstract

CLEC4F, a member of C-type lectin, was first purified from rat liver extract with high binding affinity to fucose, galactose (Gal), N-acetylgalactosamine (GalNAc), and un-sialylated glucosphingolipids with GalNAc or Gal terminus. However, the biological functions of CLEC4F have not been elucidated. To address this question, we examined the expression and distribution of murine CLEC4F, determined its binding specificity by glycan array, and investigated its function using CLEC4F knockout (Clec4f-/-) mice. We found that CLEC4F is a heavily glycosylated membrane protein co-expressed with F4/80 on Kupffer cells. In contrast to F4/80, CLEC4F is detectable in fetal livers at embryonic day 11.5 (E11.5) but not in yolk sac, suggesting the expression of CLEC4F is induced as cells migrate from yolk cells to the liver. Even though CLEC4F is not detectable in tissues outside liver, both residential Kupffer cells and infiltrating mononuclear cells surrounding liver abscesses are CLEC4F-positive upon Listeria monocytogenes (L. monocytogenes) infection. While CLEC4F has strong binding to Gal and GalNAc, terminal fucosylation inhibits CLEC4F recognition to several glycans such as Fucosyl GM1, Globo H, Bb3∼4 and other fucosyl-glycans. Moreover, CLEC4F interacts with alpha-galactosylceramide (α-GalCer) in a calcium-dependent manner and participates in the presentation of α-GalCer to natural killer T (NKT) cells. This suggests that CLEC4F is a C-type lectin with diverse binding specificity expressed on residential Kupffer cells and infiltrating monocytes in the liver, and may play an important role to modulate glycolipids presentation on Kupffer cells.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Acetylgalactosamine / chemistry
  • Acetylgalactosamine / immunology
  • Animals
  • Antigens, Differentiation / genetics*
  • Antigens, Differentiation / immunology
  • Binding Sites
  • Carbohydrate Sequence
  • Embryo, Mammalian
  • Galactose / chemistry
  • Galactose / immunology
  • Galactosylceramides / chemistry
  • Galactosylceramides / immunology
  • Gene Expression Regulation, Developmental
  • Glycosylation
  • Kupffer Cells / immunology
  • Kupffer Cells / metabolism*
  • Kupffer Cells / microbiology
  • Lectins, C-Type / chemistry
  • Lectins, C-Type / genetics*
  • Lectins, C-Type / immunology
  • Listeria monocytogenes / immunology
  • Listeriosis / genetics*
  • Listeriosis / immunology
  • Listeriosis / metabolism
  • Listeriosis / microbiology
  • Liver / immunology
  • Liver / metabolism*
  • Liver / microbiology
  • Mice
  • Mice, Knockout
  • Molecular Sequence Data
  • Monocytes / immunology
  • Monocytes / metabolism
  • Monocytes / microbiology
  • Natural Killer T-Cells / immunology
  • Natural Killer T-Cells / metabolism
  • Natural Killer T-Cells / microbiology
  • Protein Binding

Substances

  • Antigens, Differentiation
  • CLEC4F protein, mouse
  • Galactosylceramides
  • Lectins, C-Type
  • alpha-galactosylceramide
  • monocyte-macrophage differentiation antigen
  • Acetylgalactosamine
  • Galactose

Grant support

This work was supported by the National Science Council (NSC 101-2325-B-010-006 and NSC 101-2321-B-010-003), Academia Sinica, Thematic Research Project (AS-101-TP-B06-2) and in part by the Infection and Immunity Center, National Yang-Ming University, Taiwan (a grant from Ministry of Education, Aim for the Top University Plan), Taipei Veterans General Hospital (V102E4-003), Taichung Veterans General Hospital (TCVGH-YM1010202). The funders had no role in study design, data collection and analysis, decision to publish, or preparation of the manuscript.