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Related Experiment Videos

OxLDL increases endothelial stiffness, force generation, and network formation.

Fitzroy J Byfield1, Saloni Tikku, George H Rothblat

  • 1Institute for Medicine and Engineering, Department of Pathology and Laboratory Medicine, University of Pennsylvania, Philadelphia, PA 19104, USA.

Journal of Lipid Research
|January 19, 2006
PubMed
Summary

Oxidatively modified low-density lipoprotein (OxLDL) stiffens human aortic endothelial cells by disrupting lipid rafts, not by altering cholesterol levels. This endothelial stiffening increases cellular force generation and network formation.

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Area of Science:

  • Biomedical Engineering
  • Cell Biology
  • Cardiovascular Research

Background:

  • Endothelial cells form the inner lining of blood vessels.
  • Oxidatively modified low-density lipoprotein (OxLDL) is implicated in atherosclerosis.
  • Biomechanical properties of endothelial cells are crucial for vascular function.

Purpose of the Study:

  • To investigate the impact of OxLDL on the biomechanical properties of human aortic endothelial cells (HAECs).
  • To elucidate the mechanisms underlying OxLDL-induced changes in endothelial cell mechanics.

Main Methods:

  • Micropipette aspiration was used to measure HAEC membrane deformability.
  • Endothelial cells from healthy and hypercholesterolemic pigs were analyzed.
  • Lipid raft integrity was assessed using a GM1 marker.

Related Experiment Videos

  • Cellular force generation and network formation were evaluated in collagen gels.

    • Main Results:

    • OxLDL treatment decreased HAEC membrane deformability by 90%.
    • Endothelial cells from hypercholesterolemic pigs were stiffer than those from healthy pigs.
    • OxLDL caused the disappearance of the lipid raft marker GM1, without affecting membrane cholesterol.
    • OxLDL increased endothelial force generation, cell elongation, and network formation in 3D collagen gels.

    Conclusions:

    • OxLDL exposure disrupts or redistributes lipid rafts in HAECs.
    • This lipid raft alteration leads to endothelial stiffening and increased force generation.
    • These biomechanical changes may contribute to vascular dysfunction in atherosclerosis.