Articles |
the Departments of Surgery and Pathology (M.B., M.A.R.), University of Washington, Seattle.
The migration of arterial smooth muscle cells (SMCs) plays an important role in normal vessel development as well as the pathobiology of blood vessels. Because it is difficult to study cell migration in primates, we used ex vivo explants. The response of baboon aortic medial explants incubated in vitro in a serum-free medium with insulin and transferrin was compared with the response of whole artery injured in vivo by a balloon catheter to establish the validity of the explant model. Both the time course of entry of SMCs into the S phase and the changes in matrix metalloproteinase 9 were similar in the artery and the explants. SMCs began migrating from explants after a lag of 3 days. By day 11, >90% of the explants exhibited SMC migration from the tissue (percent of explants with
1 migrating cell). Basal migration was inhibited by antibodies to urokinase and tissue-type plasminogen activator, whereas addition of plasminogen to the explants increased migration. An inhibitor of matrix metalloproteinases, BB-94 (Batimistat), decreased migration, as did
2-macroglobulin. These data demonstrate that proteinases of the matrix metalloproteinase and plasminogen/plasminogen activator families play an important role in the migration of primate arterial SMCs through the extracellular matrix.
Key Words: matrix metalloproteinases plasminogen urokinase tissue-type plasminogen activator smooth muscle cell migration
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