Parallel decrease of tissue factor surface exposure and increase of tissue factor microparticle release by the n-3...

Area of Science:

• Endothelial biology
• Cardiovascular research
• Omega-3 fatty acids

Background:

• Endothelial cells express tissue factor (TF) under inflammatory conditions, promoting thrombosis.
• Fish-derived omega-3 fatty acids are linked to reduced myocardial infarction incidence.
• Docosahexaenoate (DHA) is a major omega-3 fatty acid with potential endothelial effects.

Purpose of the Study:

• To investigate the impact of docosahexaenoate (DHA) on tissue factor (TF) expression in endothelial cells.
• To elucidate the mechanisms by which DHA affects endothelial TF presentation and pro-thrombotic potential.

Main Methods:

• Human umbilical vein endothelial cells were pre-incubated with DHA, stearate, or arachidonate.
• Cells were subsequently stimulated with lipopolysaccharide (LPS) or tumor necrosis factor-alpha.
• TF surface protein exposure, mRNA, total protein, and microparticle release were analyzed.

Main Results:

• DHA pre-incubation concentration-dependently reduced TF surface protein exposure on endothelial cells.
• This reduction was independent of changes in TF mRNA or total protein levels.
• DHA treatment induced the release of TF-exposing microparticles, accounting for decreased cell surface TF.

Conclusions:

• DHA treatment increases the release of TF-exposing microparticles from endothelial cells.
• This microparticle release mechanism explains the observed decrease in endothelial cell TF surface exposure.
• DHA's effect on microparticle release may contribute to the cardioprotective effects associated with omega-3 fatty acids.