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Carbohydrate recognition systems in avian sinusoidal liver cells.

L Dini1, P Mattioli

  • 1Department of Biology, University of Tor Vergata Rome, Italy.

Bioscience Reports
|February 1, 1990
PubMed
Summary

Chicken liver cells recognize specific sugars on glycoproteins. Both embryonic and adult chickens have these carbohydrate-binding sites, but their distribution and quantity on Kupffer cells change with age.

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Area of Science:

  • Cell biology
  • Glycobiology
  • Immunology

Background:

  • Liver sinusoidal cells play crucial roles in immune surveillance and metabolism.
  • Carbohydrate recognition systems are vital for cell-cell interactions and immune responses.
  • Understanding these systems in avian models provides comparative insights into vertebrate biology.

Purpose of the Study:

  • To investigate and compare carbohydrate recognition systems on chicken liver sinusoidal cells in embryonic and adult stages.
  • To localize and quantify binding sites for N-acetylglucosamine (GlcNAc), mannose, and galactose (Gal) residues on different liver cell types.

Main Methods:

  • Histochemical localization and quantification of specific glycoprotein binding sites using ligand-gold complexes.
  • Microscopic analysis of gold particle distribution on sinusoidal cells, including Kupffer cells, hepatocytes, and endothelial cells.
  • Comparative analysis between 20-day-old embryonic and adult chicken liver tissues.

Main Results:

  • Liver sinusoidal cells from both embryonic and adult chickens express binding sites for GlcNAc, mannose, and Gal residues.
  • Hepatocytes primarily bind glycoproteins with GlcNAc residues.
  • Kupffer cells show age-dependent variations in the number and distribution of GlcNAc- and Gal-specific receptors, with distinct patterns for mannose-specific sites.

Conclusions:

  • Chicken liver sinusoidal cells possess distinct carbohydrate-binding capabilities that are modulated by age.
  • The differential expression and distribution of these receptors suggest age-specific roles in liver function and immunity.
  • These findings contribute to understanding the ontogeny of carbohydrate-mediated cellular interactions in the avian liver.

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