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Related Experiment Videos

Altered eicosanoid biosynthesis in selenium-deficient endothelial cells.

Y Z Cao1, C C Reddy, L M Sordillo

  • 1Department of Veterinary Science, The Pennsylvania State University, University Park, PA, USA.

Free Radical Biology & Medicine
|March 4, 2000
PubMed
Summary

Selenium status impacts arachidonic acid metabolism. Selenium deficiency alters eicosanoid production via cyclooxygenase and lipoxygenase pathways, potentially causing vascular dysfunction.

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Area of Science:

  • Biochemistry
  • Cell Biology
  • Nutritional Science

Background:

  • Selenium (Se) is crucial for Se-dependent glutathione peroxidase (Se-GSH-Px).
  • Se-GSH-Px modulates fatty acid hydroperoxides, influencing arachidonic acid cascade enzymes like cyclooxygenase (COX) and lipoxygenase (LOX).

Purpose of the Study:

  • To investigate the effects of cellular selenium status on arachidonic acid enzymatic oxidation in bovine mammary endothelial cells (BMEC).

Main Methods:

  • BMEC were cultured in Se-deficient (-Se) and Se-adequate (+Se) media.
  • Cells were stimulated with calcium ionophore A23187 to measure eicosanoid production.

Main Results:

  • Se-deficient BMEC showed decreased production of prostaglandin I(2) (PGI(2)), prostaglandin F(2alpha) (PGF(2alpha)), and prostaglandin E(2) (PGE(2)) compared to Se-adequate cells.

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  • Thromboxane A(2) (TXA(2)) production was significantly increased in Se-deficient BMEC.
  • Lipoxygenase pathway metabolite, 15-hydroperoxyeicosatetraenoic acid (15-HPETE), was significantly higher in Se-deficient cells.

    • Conclusions:

    • Cellular Se status plays a critical regulatory role in arachidonic acid oxidation via COX and LOX pathways.
    • Altered eicosanoid biosynthesis, particularly 15-HPETE overproduction in Se deficiency, may contribute to vascular dysfunction.