Probucol downregulates E-selectin expression on cultured human vascular endothelial cells

Area of Science:

• Cardiovascular Science
• Molecular Biology
• Pharmacology

Background:

• Atherosclerotic lesion development involves macrophage accumulation, influenced by endothelial cell adhesion molecules.
• Probucol is a potent antioxidant with known effects on vascular endothelium.

Purpose of the Study:

• To investigate probucol's effect on cell adhesion molecule expression in human umbilical vein endothelial cells (HUVECs).
• To elucidate a novel mechanism for probucol's action in hyperlipidemic states.

Main Methods:

• HUVECs were stimulated with lipopolysaccharide and treated with varying concentrations of probucol.
• Expression of intercellular adhesion molecule-1 (ICAM-1) and E-selectin was measured using cell-enzyme-linked immunosorbent assay and mRNA analysis.
• In vitro binding assays assessed the interaction between U937 monocytic cells and HUVECs.

Main Results:

• Probucol significantly downregulated E-selectin expression and mRNA in a dose-dependent manner.
• Probucol did not affect ICAM-1 expression or mRNA levels.
• Probucol dose-dependently suppressed the binding of U937 cells to stimulated HUVECs.

Conclusions:

• Probucol inhibits E-selectin-mediated monocyte adhesion to endothelial cells.
• This inhibition of adhesion molecules represents a novel mechanism for probucol's anti-atherosclerotic effects.