The Effect of a High-Fat Diet on the Development of Abdominal Aortic Aneurysm in a Vascular Hypoperfusion-Induced Animal Model.

Abdominal aortic aneurysm (AAA) is a vascular disease characterized by chronic inflammation in the infrarenal aorta. Most cases of AAA remain asymptomatic until rupture, and the mortality rate of patients with AAA rupture is very high. Currently, the relation between dietary habits and AAA development remains unknown. In this study, we evaluated the effects of a high-fat diet on the development of AAA in a vascular hypoperfusion-induced animal model. The risk of AAA rupture and AAA diameter in the high-fat group significantly increased compared with those in the control group. The number and size of adipocytes in the vascular wall in the high-fat group significantly increased as compared with those in the control group. Additionally, the collagen-positive sections in the areas with adipocytes significantly decreased as compared with those without adipocytes. The protein levels of matrix metalloproteinase (MMP)-2, MMP-9, and MMP-12, and macrophage-positive areas in the parts with adipocytes also significantly increased as compared with those without adipocytes. These data suggested that AAA rupture risk increased through accelerating chronic inflammation due to the accumulation of adipocytes in the vascular wall in the high-fat group.