Icariin inhibits oxidized low-density lipoprotein-induced proliferation of vascular smooth muscle cells by suppressing activation of extracellular signal-regulated kinase 1/2 and expression of proliferating cell nuclear antigen

• Published in: Molecular medicine reports Vol. 13; no. 3; pp. 2899 - 2903
• Main Authors: HU, YANWU, LIU, KAI, YAN, MENGTONG, ZHANG, YANG, WANG, YADI, REN, LIQUN
• Format: Journal Article
• Language: English
• Published: Greece D.A. Spandidos 01.03.2016; Spandidos Publications; Spandidos Publications UK Ltd
• Subjects: Antigens; Arteriosclerosis; Atherosclerosis; Atherosclerosis - drug therapy; Bioflavonoids; Biotechnology; Cell cycle; Cell growth; Cell proliferation; Cell Proliferation - drug effects; Cells, Cultured; Cold; Deoxyribonucleic acid; DNA; Drug Evaluation, Preclinical; Extracellular signal-regulated kinase; extracellular signal-regulated kinase 1/2; Flavones; Flavonoids; Flavonoids - pharmacology; Flow cytometry; Health aspects; Herbal medicine; Humans; icariin; Inflammation; Kinases; Lipoproteins; Lipoproteins, LDL; Low density lipoprotein; Mitogen-Activated Protein Kinase 1 - genetics; Mitogen-Activated Protein Kinase 1 - metabolism; Mitogen-Activated Protein Kinase 3 - genetics; Mitogen-Activated Protein Kinase 3 - metabolism; Muscle, Smooth, Vascular - cytology; Myocytes, Smooth Muscle - drug effects; Myocytes, Smooth Muscle - physiology; Observations; oxidized low-density lipoprotein; Phase transitions; Phosphorylation; Physiological aspects; Proliferating cell nuclear antigen; Proliferating Cell Nuclear Antigen - genetics; Proliferating Cell Nuclear Antigen - metabolism; Protein expression; Protein Processing, Post-Translational; Proteins; Smooth muscle; Statistical analysis; vascular smooth muscle cell proliferation; United States > US; China
• ISSN: 1791-2997; 1791-3004
• DOI: 10.3892/mmr.2016.4813

Icariin, a flavonoid isolated from the traditional Chinese herbal medicine Epimedium brevicornum Maxim, has been shown to possess anti-inflammatory, anti-oxidant and anti-atherosclerotic activities in vivo and in vitro. The aim of the present study was to investigate the effects of icariin on oxidized low-density lipoprotein (ox-LDL)-induced proliferation of vascular smooth muscle cells (VSMCs) and the possible underlying mechanism. VSMCs were cultured and pre-treated with various concentrations of icariin (0, 10, 20 or 40 µm) prior to stimulation by ox-LDL (50 µg/ml). Cell proliferation was evaluated by an MTT assay. Flow cytometry was used to study the influence of icariin on the cell cycle. Proliferating cell nuclear antigen (PCNA) expression and phosphorylation levels of extracellular signal-regulated kinase (ERK)1/2 were detected by western blot analysis. The results indicated that icariin significantly inhibited ox-LDL-induced proliferation of VSMCs and phosphorylation of ERK1/2. Furthermore, icariin also blocked the ox-LDL-induced cell-cycle progression at G1/S-interphase and downregulated the expression of PCNA in VSMCs. In conclusion, the present study indicated for the first time that icariin reduced the amount of ox-LDL-induced proliferation of VSMCs through suppression of PCNA expression and inactivation of ERK1/2.