(Circulation. 2001;103:284.)
© 2001 American Heart Association, Inc.
Basic Science Reports |
Role of Rho-Associated Kinase in Neointima Formation After Vascular Injury
From Internal Medicine III and Cardiovascular Research Institute (R.S., H.K., Y.S., T.I.) and Department of Pathology (S.K., M.M.), Kurume University School of Medicine, Kurume, and Division of Signal Transduction, Nara Institute of Science and Technology, Ikoma (K.K.), Japan.
Correspondence to Hisashi Kai, MD, PhD, Cardiovascular Research Institute, Kurume University, 67 Asahimachi, Kurume 830-0011, Japan. E-mail naikai{at}med.kurume-u.ac.jp
Background—The Rho/Rho-associated kinase (Rho-kinase) system is implicated in various cellular functions, including migration, proliferation, and apoptosis. Because a possible role of the system is suggested in neointima formation after vascular injury, we sought to examine whether a new specific Rho-kinase inhibitor, Y27632, prevents neointima formation of the balloon-injured rat carotid artery, and if so, to investigate the effects of Y27632 on migration, proliferation, and apoptosis of smooth muscle cells (SMCs) in the injured artery.
Methods and Results—Y27632 was administered intraperitoneally from 1 day before to 14 days after vascular injury. Treatment with Y27632 inhibited phenylephrine-induced Rho-kinase activation in the carotid artery on the basis of immunoblotting against the phosphorylated myosin-binding subunit of myosin phosphatase. Y27632 markedly prevented neointima formation at days 7 and 14. In controls, BrdU+ proliferating and TUNEL+ apoptotic SMCs were transiently and coincidentally increased in the neointima, with a peak at day 7. Y27632 significantly increased the neointimal TUNEL+ SMCs at days 7 and 14, but not BrdU+ SMCs. Y27642 significantly decreased the number of intimal SMCs at day 4, while not affecting the number of BrdU+ or TUNEL+ SMCs. Reendothelialization after balloon injury was not significantly affected by Y27632 at days 7 and 14.
Conclusions—Y27632 inhibited neointima formation by enhancing SMC apoptosis and probably by suppressing early SMC migration. Therefore, a role of Rho-kinase is suggested in neointima formation after vascular injury.
Key Words: kinases • neointima • apoptosis • migration
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