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J Korean Diabetes Assoc. 2007 May;31(3):200-207. Korean. Original Article.
Kim HJ , Lee IK , Kim YH , Shin SY , Lee YH , Kim JG , Kim BW , Kim HS , Kim MK , Park KG , Ryu SY .
Department of Internal Medicine, Kyungpook National University, School of Medicine, Korea.
Department of Microbiology, Kyungpook National University, College of Science and Technology, Korea.
Division of Molecular and Life Sciences, College of Science and Technology, Hanyang University, Korea.
Department of Internal Medicine, Keimyung University School of Medicine, Korea.

BACKGROUND: The proliferation of vascular smooth muscle cells (VSMCs) is a hallmark of atheroscelrosis and post-angioplasty restenosis. We previously showed that alpha-lipoic acid (ALA) inhibited neointimal hyperplasia and has potential anti-atherosclerosis effect in rat carotid artery balloon injured model. Here, we investigated whether alpha-lipoic acid inhibited proliferation of cells and induced apoptosis in rat vascular smooth muscle cells. METHODS: VSMCs were treated with ALA under each condition, harvested and protein was extracted. Same amount of protein was loaded into SDS-PAGE and western blot analysis was performed with various cell cycle regulation protein. To examine ALA induce apoptosis in VSMCs, FACS and DNA fragmentation assay were performed. Antioxidant effect of ALA was determined by DCF-DA staining. RESULTS: ALA induced VSMCs cell cycle arrest and induced p21, p27 and p53 proteins. Also ALA induced PTEN expression and AMPK phosphorylation. Increased AMPK phosphorylation reduced Erk-2 phosphorylation and finally arrested cell cycle promotion. The apoptotic effect was also shown by ALA treatment. Also we confirmed that ALA reduced ROS generation in VSMCs. CONCLUSION: The present data suggest that ALA has anti-proliferative effect and arrests cell proliferation. Therefore, ALA may provide new strategies for the prevention of neointimal hyperplasia after angioplasty.

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