Fish oil, atherogenesis, and thrombogenesis

Area of Science:

• Cardiovascular Science
• Nutritional Science
• Molecular Biology

Background:

• Marine fish consumption is linked to reduced ischemic heart disease mortality.
• Fish oil supplementation's effects on cardiovascular health are debated, with potential risks at high doses.
• Moderate fish intake shows benefits without altering key cardiovascular markers.

Purpose of the Study:

• To investigate the mechanism by which fish oil reduces monocyte-endothelial cell interactions in atherosclerosis.
• To determine the specific fatty acid responsible for these effects and its mechanism of action.

Main Methods:

• In vivo study in swine: assessing cod-liver oil supplementation's effect on coronary artery lesions.
• In vitro assay: evaluating fatty acid effects on monocyte-endothelial cell adhesion using stimulated swine aortic endothelial cells (SAEC) and U937 cells.
• In vitro study: examining eicosapentaenoic acid's (EPA) impact on adhesion molecule expression (VCAM-1, ELAM-1, ICAM-1) in human umbilical vein endothelial cells (HUVEC).

Main Results:

• Cod-liver oil supplementation reduced monocyte adhesions and platelet clumps in swine coronary arteries.
• Eicosapentaenoic acid (EPA), but not other tested fatty acids, significantly reduced U937-SAEC adhesion.
• EPA reduced U937 cell adhesion and its effectiveness was time-dependent.
• EPA exposure decreased the expression of VCAM-1, ELAM-1, and ICAM-1 in LPS-stimulated HUVEC.

Conclusions:

• Fish oil, specifically EPA, exhibits hypothrombogenic properties.
• EPA reduces monocyte-endothelial cell adhesion, likely by impairing the induction/expression of key adhesion molecules.
• These findings suggest a mechanism for the cardiovascular benefits of marine fish consumption.