Statin prevents plaque disruption in apoE-knockout mouse model through pleiotropic effect on acute inflammation

Abstract 

Although it has been demonstrated that statins stabilize atherosclerotic lesions in animal models of advanced atherosclerosis, there is little evidence to suggest that statins have a preventive effect on plaque rupture itself. In the present study, we examined the effect of fluvastatin on plaque disruption using a simple and quick method of plaque disruption in carotid artery lesions in apolipoprotein E-deficient mice. Male apolipoprotein E-deficient mice received normal chow and underwent ligation of the left common carotid artery just proximal to its bifurcation. Four weeks later, a polyethylene cuff was placed around the artery immediately proximal to the ligation site. Fluvastatin (10mg/kg per day) was given by oral gavage every day starting at 3 days before cuff placement. The administration of fluvastatin suppressed atherosclerotic plaque disruption accompanied by luminal thrombi by 31.5% compared with controls at 4 days after the cuff was placed at the ligated carotid artery. Fluvastatin administration decreased matrix metalloproteinase-9 expression, gelatinolytic activity, endothelial adhesion molecules expression and neutrophil infiltration, and increased type I collagen content in the cuffed region. In summary, fluvastatin was found to prevent plaque disruption through pleiotropic effect on acute inflammation in an animal model using apolipoprotein E-deficient mice.

Keywords: Atherosclerosis, Plaque, Inflammation, MMPs, Matrix protein