© 1996 American Heart Association, Inc.
Articles |
Differential Expression of 
1 Type VIII Collagen in Injured Platelet-Derived Growth Factor-BB–Stimulated Rat Carotid Arteries
the Department of Pathology, University of Washington (M.B.P., S.R., W.D.T., C.M.G., S.M.S., M.A.R.), and Zymogenetics Inc (C.H.), Seattle, Wash.
Migration of smooth muscle cells from media to intima is critical for the development of neointimal thickening after balloon catheter injury of the rat carotid artery. The present experiments were designed to identify molecules expressed by smooth muscle cells migrating in vivo in the injured artery. Cell migration was maximized by infusing recombinant platelet-derived growth factor-BB (PDGF-BB) after a minimal filament denudation of the rat carotid artery, whereas cell proliferation was minimized by injecting an antibody against basic fibroblast growth factor (bFGF). This treatment caused an eightfold increase in smooth muscle cell migration into the intima but only a twofold increase in intimal smooth muscle cell replication rates. Differential display screening was used to isolate cDNAs that were overexpressed in the injured PDGF-BB–treated versus unmanipulated rat carotids. One of the clones isolated hybridized to a 4.2-kb mRNA species and shared 90% sequence homology to mouse 
1 type VIII collagen. Northern and Western blots confirmed overexpression of type VIII collagen in the injured PDGF-BB–treated vessels. In a separate series of experiments, we performed filament denudation injury and administered antibodies to inhibit the actions of endogenous bFGF and PDGF-BB, thereby decreasing smooth muscle cell migration, and found that type VIII collagen mRNA expression varied with migration. Using a different arterial injury model (balloon catheter injury), we showed that expression of type VIII collagen was maximal 2 to 4 days after injury, in coincidence with cell migration from the media to the intima. This molecule constitutes an important component of smooth muscle cell response to vessel injury and may play an important functional role in mediating migration.
Key Words: arterial injury • smooth muscle cell • migration • extracellular matrix
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