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Structural relation between HDL-binding proteins in porcine liver

R P de Crom1, R van Haperen, P Visser

  • 1Department of Cell Biology and Genetics, Erasmus University Rotterdam, The Netherlands.

Arteriosclerosis and Thrombosis : a Journal of Vascular Biology
|February 1, 1994
PubMed
Summary

Researchers identified three high-density lipoprotein (HDL)-binding proteins in porcine liver. These proteins, with molecular masses of 90, 110, and 180 kDa, share common structural features and are located in liver cells.

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Area of Science:

  • Biochemistry
  • Molecular Biology
  • Hepatology

Background:

  • High-density lipoprotein (HDL)-binding proteins play crucial roles in lipid metabolism.
  • Previous studies indicated the presence of HDL-binding proteins in liver tissue.

Purpose of the Study:

  • To investigate the relationship between different molecular mass HDL-binding proteins found in porcine liver.
  • To characterize the structural and immunological properties of these proteins.

Main Methods:

  • Ligand blotting using radiolabeled HDL.
  • Sodium dodecyl sulfate polyacrylamide gel electrophoresis (SDS-PAGE) under reducing and non-reducing conditions.
  • Cyanogen bromide cleavage and peptide analysis.
  • Immunoblotting with specific antiserum.

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  • Immunohistochemical localization.

    • Main Results:

    • Three distinct HDL-binding proteins (90, 110, and 180 kDa) were identified in porcine liver.
    • All three proteins, when reduced, yielded a 90 kDa band, suggesting a common subunit.
    • Antiserum against the 90 kDa protein cross-reacted with the 110 and 180 kDa proteins.
    • Peptide mapping indicated structural similarities among the three proteins.
    • Immunohistochemistry localized these proteins to sinusoidal borders and hepatocellular plates.

    Conclusions:

    • The 90, 110, and 180 kDa HDL-binding proteins in porcine liver are related, likely representing different oligomeric forms or post-translational modifications of a common 90 kDa subunit.
    • These proteins are integral components of liver cells, potentially involved in HDL uptake or transport.