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Related Experiment Videos

Endothelium-derived microparticles impair endothelial function in vitro.

Sergey V Brodsky1, Fan Zhang, Alberto Nasjletti

  • 1Department of Medicine, New York Medical College, Valhalla, New York 10595, USA. sergey_brodsky@nymc.edu

American Journal of Physiology. Heart and Circulatory Physiology
|April 10, 2004
PubMed
Summary

Circulating endothelial microparticles (EMPs) worsen endothelial cell dysfunction (ECD). These particles impair blood vessel function and nitric oxide production, suggesting they actively contribute to cardiovascular disease progression.

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Area of Science:

  • Cardiovascular Biology
  • Endothelial Cell Biology
  • Pathophysiology

Background:

  • Endothelial cell dysfunction (ECD) is a key factor in prevalent cardiovascular diseases.
  • Increased procoagulant endothelial microparticles (EMPs) are found in conditions like ischemia, preeclampsia, and diabetes, suggesting they are markers of ECD.
  • Previous research indicated EMPs have procoagulant potential and are mobilized by PAI-1.

Purpose of the Study:

  • To investigate the direct effects of isolated endothelial microparticles (EMPs) on vascular endothelium function.
  • To determine if EMPs contribute to or exacerbate endothelial cell dysfunction.

Main Methods:

  • Isolated EMPs were applied to rat aortic rings and cultured endothelial cells.
  • Assessed effects on acetylcholine-induced vasorelaxation and nitric oxide production.

Related Experiment Videos

  • Measured superoxide production and analyzed for NADPH-oxidase subunits (p22(phox)).

    • Main Results:

    • EMPs impaired vasorelaxation and nitric oxide production in a concentration-dependent manner.
    • EMPs increased superoxide production in aortic rings and endothelial cells.
    • Superoxide production was linked to EMPs and NADPH-oxidase activity, and inhibited by SOD mimetic and eNOS inhibitor.

    Conclusions:

    • Circulating EMPs directly impair vascular endothelial function.
    • EMPs not only serve as markers for ECD but also actively aggravate it.
    • These findings highlight EMPs as a direct contributor to cardiovascular disease pathogenesis.