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Related Experiment Videos

Glycosaminoglycan-lipoprotein interaction.

U Olsson1, G Ostergren-Lundén, J Moses

  • 1Wallenberg Laboratory for Cardiovascular Research, Göteborg University, Sahlgrenska University Hospital, Göteborg, Sweden. urban.olsson@eu.amershambiosciences.com

Glycoconjugate Journal
|November 21, 2002
PubMed
Summary

Different glycosaminoglycans (GAGs) bind specific lipoprotein subclasses, impacting cardiovascular health and potentially atherosclerosis development. This research clarifies these complex interactions.

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Area of Science:

  • Cardiovascular Biology
  • Glycobiology
  • Lipid Metabolism

Background:

  • Proteoglycans (PGs) with glycosaminoglycans (GAGs) in the cardiovascular system have diverse roles, including viscoelasticity and growth factor modulation.
  • Lipoprotein binding to arterial GAGs is implicated in atherosclerosis initiation.
  • Understanding lipoprotein-GAG interactions is crucial for metabolic research.

Purpose of the Study:

  • To investigate the binding patterns of various lipoprotein subclasses with specific GAG categories.
  • To elucidate the role of GAG composition in proteoglycans on lipoprotein binding.

Main Methods:

  • Utilized a gel mobility-shift assay to evaluate lipoprotein-GAG interactions.
  • Assessed binding to metabolically labeled whole proteoglycans from arterial smooth muscle cells, THP-1 macrophages, and HepG2 cells.

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  • Employed enzymatic degradation to study the effect of GAG composition on binding.

    • Main Results:

    • Heparan sulfate bound beta-very low density lipoproteins (β-VLDL) and a chylomicron remnant model, but not low-density lipoproteins (LDL).
    • Dermatan sulfate bound LDL but not β-VLDL or the chylomicron remnant model.
    • Chondroitin sulfate and heparin bound all tested lipoproteins (LDL, β-VLDL, β-VLDL+apoE) with varying affinities.

    Conclusions:

    • Each lipoprotein subclass exhibits specific binding affinities for distinct GAGs.
    • These findings enhance understanding of the intricate links between carbohydrate and lipid metabolism.
    • The results provide insights into mechanisms potentially contributing to atherosclerosis.