Macrophage migration inhibitory factor is associated with aneurysmal expansion

Area of Science:

• Cardiovascular Biology
• Immunology
• Vascular Medicine

Background:

• Macrophage migration inhibitory factor (MIF) is an inflammatory cytokine implicated in immune responses.
• Atherosclerosis and abdominal aortic aneurysm (AAA) are inflammatory vascular diseases.
• The specific role of MIF in human atherosclerosis and AAA remains largely uncharacterized.

Purpose of the Study:

• To investigate the expression and localization of MIF in human atherosclerotic and aneurysmal lesions.
• To determine the correlation between serum MIF levels and clinical parameters of AAA, including size and expansion rate.

Main Methods:

• Immunohistochemistry was used to detect MIF protein in tissue sections of normal aortas, atherosclerotic carotids, and AAAs.
• Serum MIF levels were measured using an enzyme-linked immunosorbent assay (ELISA) in a cohort of men with small AAAs.
• Longitudinal follow-up data were collected to assess AAA expansion rate.

Main Results:

• MIF protein was found to colocalize with macrophages, endothelial cells, and smooth muscle cells in atherosclerotic and aneurysmal lesions, with negligible expression in normal arteries.
• Serum MIF levels showed a significant positive correlation with the annual AAA expansion rate.
• Serum MIF levels also correlated significantly with initial AAA size, even after adjusting for confounding factors.

Conclusions:

• MIF is highly expressed in the cellular components of atherosclerotic and aneurysmal vascular lesions.
• Serum MIF levels are associated with both the initial size and the rate of expansion of abdominal aortic aneurysms.
• These findings suggest that MIF may play a significant role in the pathogenesis of atherosclerosis and AAA.