Arteriosclerosis, Thrombosis, and Vascular Biology. 1995;15:1432-1443
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© 1995 American Heart Association, Inc.
Articles |
Plasminogen Activator System in Human Coronary Atherosclerosis
From the Cardiovascular Division, Department of Medicine, and the Department of Pathology and Laboratory Medicine (J.E.T., R.J.C.), University of Pennsylvania School of Medicine, Philadelphia, Pa.
Abstract Altered coronary artery expression of plasminogen activator (PA) system components may predispose to thrombosis and modulate the vascular response to injury. By immunohistochemistry, we studied the expression of PAs (tPA and uPA), their major physiological inhibitor (PAI-1), and a receptor for uPA (uPAR) in human coronary arteries with either pure fibrointimal proliferation (n=15) or developed atherosclerotic plaques (n=10). Overall, the degree of staining showed the following rank order: PAI-1>tPA>uPAR>uPA. A similar pattern was seen in two normal coronary arteries. There were no significant differences in the extent of staining in any vascular compartment between atherosclerotic arteries and those with only fibrointimal proliferation. However, the ratio of intimal to medial expression of tPA (P=.001) and uPAR (P=.004) was significantly increased in atherosclerotic arteries, with a similar trend for uPA (P=.069) but not for PAI-1 (P=.73). Four of 10 atherosclerotic arteries had higher uPAR expression in the intima than in the media, whereas none of the 15 arteries with only fibrointimal proliferation had this pattern (P<.01). Dual labeling studies demonstrated colocalization of all four PA system components in endothelial cells, smooth muscle cells, and macrophages, with a predominance of PAI-1. Thus, coronary arteries with a wide range of vascular pathology express an abundance of antifibrinolytic potential with enhanced local expression of profibrinolytic proteins, mainly within atherosclerotic plaques.
Key Words: endothelium • plasminogen activator inhibitor • urokinase receptor • smooth muscle cells • atherosclerosis
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