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Chylomicrons induce E-selectin and VCAM-1 expression in endothelial cells
A Moers1, S Fenselau, J Schrezenmeir
1Dpt. Physiology and Biochemistry of Nutrition, Federal Research Centre, Kiel, Germany.
Summary
Postprandial lipoproteins, specifically chylomicrons, significantly increase leukocyte adhesion molecules, contributing to atherosclerosis. Incubation with lipoprotein lipase reduces this pro-atherogenic effect, highlighting a potential protective mechanism.
Area of Science:
- Cardiovascular biology
- Atherosclerosis research
- Endothelial cell function
Background:
- Leukocyte adherence to endothelium is key in atherosclerosis development.
- Endothelial cell adhesion molecules are increasingly recognized in this process.
- Lipoproteins, particularly LDL, influence adhesion molecule expression.
Purpose of the Study:
- To assess the atherogenic potential of postprandial hypertriglyceridemia.
- To investigate the impact of chylomicrons on E-selectin and VCAM-1 expression.
- To analyze the effect of lipoprotein lipase-treated chylomicrons.
Main Methods:
- Human umbilical vein endothelial cells (HUVEC) were incubated with chylomicrons (CH) and CH-lipoprotein lipase (CH-LPL).
- Lipopolysaccharide (LPS) served as a positive control.
- E-selectin and VCAM-1 expression were quantified using ELISA.
Main Results:
- Chylomicrons significantly upregulated E-selectin and VCAM-1 expression.
- LPS also induced E-selectin and VCAM-1 expression.
- CH-LPL showed no effect on E-selectin but stimulated VCAM-1 expression.
- Chylomicron-induced adhesion molecule expression was potent, comparable to LPS.
Conclusions:
- Postprandial chylomicrons strongly induce endothelial adhesion molecules, suggesting a role in atherogenesis.
- Lipoprotein lipase treatment diminishes the pro-adhesion molecule effect of chylomicrons.
- These findings link elevated triglycerides to increased vascular inflammation and atherosclerosis risk.