Objective: To determine the effect of myocardial infarction (MI) on progression of atherosclerosis in apolipoprotein E deficient (ApoE-/-) mice.
Methods and results: MI was induced following left anterior descending coronary artery (LAD) ligation in wild-type (WT) (n=9) and ApoE-/- (n=25) mice. Compared to sham-operated animals, MI mice demonstrated increased intravascular leukocyte rolling and firm adhesion by intravital microscopy, reflecting enhanced systemic leukocyte-endothelial interactions. To determine if MI was associated with accelerated atherogenesis, LAD ligation was performed in ApoE-/- mice. Six weeks following surgery, atherosclerosis was quantitated throughout the arterial tree by microdissection and Oil-Red-O staining. There was 1.6-fold greater atherosclerotic burden present in ApoE-/- MI mice compared to sham-operated mice.
Conclusions: Acute MI accelerates atherogenesis in mice. These results may be related to the increased risk of recurrent ischemic coronary events following MI in humans.
Published by Elsevier Ireland Ltd.