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(Arteriosclerosis, Thrombosis, and Vascular Biology. 2000;20:998.)
© 2000 American Heart Association, Inc.

Vascular Biology

Matrix Metalloproteinase and vß3 Integrin–Dependent Vascular Smooth Muscle Cell Invasion Through a Type I Collagen Lattice

Shigeru Kanda; Masafumi Kuzuya; Miguel A. Ramos; Teruhiko Koike; Kohichiro Yoshino; Shoji Ikeda; Akihisa Iguchi

From the Department of Geriatrics (S.K., M.K., M.A.R., T.K., A.I.), Nagoya University Graduate School of Medicine, Nagoya; and R&D Laboratories (K.Y., S.I.), Nippon Organon, Osaka, Japan.

Correspondence to Shigeru Kanda, MD, Department of Geriatrics, Nagoya University Graduate School of Medicine, 65 Tsuruma-cho, Showa-ku, Nagoya 466-8550, Japan. E-mail kanda3{at}spice.or.jp

Abstract—Smooth muscle cell (SMC) migration from the tunica media to the intima is a key event in the development of atherosclerotic lesions and in restenosis after angioplasty. SMCs require not only migratory but also degradative abilities that enable them to migrate through extracellular matrix proteins, which surround and embed these cells. We used a collagen type I lattice as a coating on top of a porous filter as a matrix barrier in a chamber to test the invasive behavior of SMCs in response to a chemoattractant (invasion assay) and compared that behavior with simple SMC migration through collagen type I–coated filters (migration assay). Inhibitors of matrix metalloproteinase, KB-R8301, tissue inhibitor of matrix metalloproteinase-1 (TIMP-1), TIMP-2, and peptide 74, attenuated platelet-derived growth factor-BB (PDGF-BB)–directed SMC invasion across the collagen lattice, whereas no effect was seen with these inhibitors on simple SMC migration through collagen-coated filters. RGD peptide inhibited SMC invasion but did not affect SMC migration. Anti-vß3 integrin antibody attenuated PDGF-BB–directed SMC invasion, whereas other antibodies against RGD-recognizing integrins, namely vß5 and 5, had no effect. None of these antibodies had any effect on simple SMC migration. RGD peptide and anti-vß3 antibody inhibited the attachment and spreading of SMCs on denatured collagen but not on native collagen. These findings indicate that there is a difference in the mechanisms between simple SMC migration across a collagen-coated filter and SMC invasion through a fibrillar collagen barrier. A proteolytic process is required for SMC invasion, and the degradation of matrix proteins alters the relationship between matrix protein molecules and SMC surface integrins.

Key Words: smooth muscle cells • integrins • collagen • matrix metalloproteinases • cell migration

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