Published Online
on April 19, 2004

A more recent version of this article appeared on May 4, 2004

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Submitted on April 11, 2003
Revised on January 23, 2004
Accepted on January 27, 2004

Macrophage-Targeted Overexpression of Urokinase Causes Accelerated Atherosclerosis, Coronary Artery Occlusions, and Premature Death

Aaron E. Cozen BA, Hideaki Moriwaki MD, PhD, Michal Kremen MD, Mary Beth DeYoung PhD, Helén L. Dichek MD, Katherine I. Slezicki , Stephen G. Young MD, Murielle Véniant PhD, and David A. Dichek MD^*

From the Gladstone Institute of Cardiovascular Disease, University of California, San Francisco (A.E.C., H.M., M.B.D., S.G.Y., M.V., D.A.D.) and the Departments of Medicine (H.M., M.K., K.I.S., D.A.D.) and Pediatrics (H.L.D.), University of Washington School of Medicine, Seattle.

^* To whom correspondence should be addressed. E-mail: ddichek{at}u.washington.edu.

Background--Human atherosclerotic lesions contain elevated levels of urokinase plasminogen activator (uPA), expressed predominantly by macrophages.

Methods and Results--To test the hypothesis that macrophage-expressed uPA contributes to the progression and complications of atherosclerosis, we generated transgenic mice with macrophage-targeted overexpression of uPA. The uPA transgene was bred into the apolipoprotein E-null background, and transgenic mice and nontransgenic littermate controls were fed an atherogenic diet. uPA-transgenic mice had significantly elevated uPA activity in the atherosclerotic artery wall, of a magnitude similar to elevations reported in atherosclerotic human arteries. Compared with littermate controls, uPA-transgenic mice had accelerated atherosclerosis, dilated aortic roots, occlusive proximal coronary artery disease, myocardial infarcts, and early mortality.

Conclusions--These data support the hypothesis that overexpression of uPA by artery wall macrophages is atherogenic and suggest that uPA inhibitors might be therapeutically useful.

Key words: urokinase • atherosclerosis • coronary disease

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