© 1999 American Heart Association, Inc.
Vascular Biology |
Role of Matrix Metalloproteinases and Their Tissue Inhibitors in the Regulation of Coronary Cell Migration
From the Cardiovascular Research Center, Department of Medicine (Cardiology) (Y.S., S.P., R.N., W.C., A.Z.) and Department of Physiology (P.D.), Thomas Jefferson University, Philadelphia, Pa.
Correspondence to Yi Shi, Thomas Jefferson University, Cardiovascular Research Center, Division of Cardiology, Suite 403D, 1025 Walnut Street, Philadelphia, PA 19107. E-mail yi.shi{at}mail.tju.edu
Abstract—The migration of vascular cells is regulated by matrix metalloproteinases (MMPs) and their tissue inhibitors (TIMPs). Because the activation of adventitial fibroblasts has been implicated in coronary repair, we have examined regional differences in cell outgrowth and the synthesis of MMPs/TIMPs in different layers of porcine coronary arteries. Coronary medial explants demonstrated significantly slower cell outgrowth than coronary adventitia in culture (P<0.001). These observations were paralleled by the predominant expression of TIMP-1 and -2 in the media (14-fold and 37-fold higher than in adventitia, respectively, P<0.001), whereas higher gelatinolytic activities (MMP-2 and -9) were released from adventitial explants. Smooth muscle cell outgrowth from the media was regulated by endogenous TIMPs, since TIMP inhibition (recombinant MMP-2 or neutralizing anti-TIMP antibodies) facilitated cell outgrowth (P<0.001). In contrast, the addition of recombinant TIMP-1 or -2 decreased adventitial cell outgrowth. In the coculture experiments, the presence of coronary media retarded adventitial cell outgrowth, whereas medial damage abrogated these effects, allowing for fibroblast migration (P<0.001). In conclusion, this study demonstrated differential migratory properties and distinct MMP/TIMP synthesis by coronary fibroblasts and smooth muscle cells. Endogenous TIMPs in the media may play an important role in maintaining coronary arterial wall homeostasis, whereas high levels of matrix-degrading activities confer the "invasive" characteristics of adventitial fibroblasts.
Key Words: migration • matrix metalloproteinases • tissue inhibitor of matrix metalloproteinase • fibroblasts • smooth muscle cells
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