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Related Experiment Videos

Beta-VLDL increases endothelial cell plasma membrane cholesterol.

J A Kim1, K Maxwell, D P Hajjar

  • 1Department of Pathology, UCLA School of Medicine, Los Angeles, CA 90024.

Journal of Lipid Research
|July 1, 1991
PubMed
Summary

Beta-very low density lipoprotein (beta-VLDL) and malondialdehyde-low density lipoprotein (MDA-LDL) increase free cholesterol in endothelial cells, primarily in plasma membranes. These cholesterol-induced cellular changes are reversible.

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Heparin-binding EGF-like growth factor (HB-EGF) antisense oligonucleotide protected against hyperlipidemia-associated atherosclerosis.

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Area of Science:

  • Cell Biology
  • Biochemistry
  • Cardiovascular Research

Background:

  • Endothelial cells play a crucial role in vascular health.
  • Dyslipidemia and altered cholesterol metabolism contribute to cardiovascular disease.
  • Understanding cholesterol distribution in endothelial cells is vital for disease mechanisms.

Purpose of the Study:

  • To investigate the distribution of free cholesterol in endothelial cells following lipoprotein loading.
  • To determine the impact of beta-very low density lipoprotein (beta-VLDL) and malondialdehyde-low density lipoprotein (MDA-LDL) on cellular cholesterol content and membrane function.

Main Methods:

  • Rabbit aortic endothelial cells were treated with beta-VLDL and MDA-LDL.
  • Cell fractionation techniques were employed to analyze enzyme activity and cholesterol distribution.

Related Experiment Videos

  • Marker enzyme activity, cholesterol content, and microfilament alterations were assessed.

    • Main Results:

    • Treatment with beta-VLDL or MDA-LDL significantly increased total free cholesterol in endothelial cells.
    • Accumulated free cholesterol localized predominantly to plasma membrane and Golgi-enriched fractions.
    • Cholesterol loading altered membrane functions, including decreased alkaline phosphatase activity and microfilament disruption, which were reversible.

    Conclusions:

    • Endothelial cells accumulate free cholesterol upon exposure to beta-VLDL and MDA-LDL, impacting membrane integrity.
    • The higher hydrolysis to esterification ratio in endothelial cells contributes to free cholesterol accumulation.
    • These cholesterol-induced cellular alterations are reversible, suggesting potential therapeutic targets.