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Aliskiren inhibits proliferation of cardiac fibroblasts in AGT-REN double transgenic hypertensive mice in vitro
Pages: 684-690
Year: Issue:  5
Journal: Acta Physiologica Sinica

Keyword:  aliskirencardiac fibroblastoxidative stressmyocardial fibrosis;
Abstract: The purpose of the present study is to explore the effect of aliskiren on the proliferation of cardiac fibroblasts(CFs) in AGTREN double transgenic hypertensive(d TH) mice. The cultured CFs from AGT-REN d TH mice were divided into AGT-REN group(d TH) and aliskiren group(ALIS). Cultured CFs from C57B6 mice were served as control(WT). The effect of different concentration of aliskiren(1 × 10-6, 1 × 10-7, 1 × 10-8, 1 × 10-9 mol/L) on CFs proliferation was determined by MTT assay. After treatment with 1 × 10-7 mol/L aliskiren for 24 h, α-SMA, collagen I, III and NADPH oxidase(NOX) protein expression in CFs of AGT-REN d TH mice were detected by Western blot. The collagen synthesis in CFs was assessed by hydroxyproline kit. The expression of ROS was determined by DHE. Results showed that the blood pressure and plasma Ang II levels were significantly increased and CFs proliferation was significantly increased as well in AGT-REN d TH mice compared with WT group. However, aliskiren intervention decreased CFs proliferation, myofibroblast transformation, as well as the collagen I and III synthesis in CFs of AGT-REN d TH mice. Meanwhile, aliskiren inhibited ROS content and NOX2/NOX4 protein expression in CFs of AGT-REN d TH mice. These results suggest that aliskiren decreases the cell proliferation, myofibroblast transformation and collagen production in CFs of AGT-REN d TH mice, which might be through inhibition of oxidative stress response.
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