Eplerenone inhibits atrial fibrosis in mutant TGF-β1 transgenic mice

The purpose of the present study was to study the impacts of eplerenone (EPL), an antagonist of mineralocorticoid receptors (MR), on atrial fibrosis in a mouse model with selective fibrosis in the atrium, and to explore the possible mechanisms. Using mutant TGF-β1 transgenic (Tx) mice, we first demo...

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Veröffentlicht in:Science China. Life sciences 2016-10, Vol.59 (10), p.1042-1047
Hauptverfasser: Chen, Xiaoqing, Zhang, Wuchang, Wang, Qian, Du, Lili, Yi, Yi, Liu, Yan, Liu, Xu, Duan, Shengzhong
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container_issue 10
container_start_page 1042
container_title Science China. Life sciences
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creator Chen, Xiaoqing
Zhang, Wuchang
Wang, Qian
Du, Lili
Yi, Yi
Liu, Yan
Liu, Xu
Duan, Shengzhong
description The purpose of the present study was to study the impacts of eplerenone (EPL), an antagonist of mineralocorticoid receptors (MR), on atrial fibrosis in a mouse model with selective fibrosis in the atrium, and to explore the possible mechanisms. Using mutant TGF-β1 transgenic (Tx) mice, we first demonstrated that EPL inhibited atrial fibrosis specifically and decreased mac- rophage accumulation in the atria of these mice. Results from immunohistochemistry and western blotting showed that EPL attenuated protein expression of fibrosis-related molecules such as connective tissue growth factor (CTGF) and fibronectin in the atria of Tx mice. In culture, EPL inhibited gene expression of fibrosis-related molecules such as fibronectin, ct-SMA, and CTGF in TGF-β1-stimulated atrial fibroblasts, Finally, using a co-culture system, we showed that TGF-β1 stimulated atrial fi- broblasts induced migration of macrophages and this was blocked by EPL. EPL also blocked TGF-β1 induced gene expression of intedeukin-6 (IL-6) in atrial fibroblasts. Therefore, we conclude that EPL attenuated atrial fibrosis and macrophage infiltra- tion in Tx mice. TGF-I31 and IL-6 were involved in the impacts of EPL on activation of atrial fibroblasts and interactions be- tween fibroblasts and macrophages.
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Using mutant TGF-β1 transgenic (Tx) mice, we first demonstrated that EPL inhibited atrial fibrosis specifically and decreased mac- rophage accumulation in the atria of these mice. Results from immunohistochemistry and western blotting showed that EPL attenuated protein expression of fibrosis-related molecules such as connective tissue growth factor (CTGF) and fibronectin in the atria of Tx mice. In culture, EPL inhibited gene expression of fibrosis-related molecules such as fibronectin, ct-SMA, and CTGF in TGF-β1-stimulated atrial fibroblasts, Finally, using a co-culture system, we showed that TGF-β1 stimulated atrial fi- broblasts induced migration of macrophages and this was blocked by EPL. EPL also blocked TGF-β1 induced gene expression of intedeukin-6 (IL-6) in atrial fibroblasts. Therefore, we conclude that EPL attenuated atrial fibrosis and macrophage infiltra- tion in Tx mice. 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Life sciences</title><addtitle>Sci. China Life Sci</addtitle><addtitle>Sci China Life Sci</addtitle><description>The purpose of the present study was to study the impacts of eplerenone (EPL), an antagonist of mineralocorticoid receptors (MR), on atrial fibrosis in a mouse model with selective fibrosis in the atrium, and to explore the possible mechanisms. Using mutant TGF-β1 transgenic (Tx) mice, we first demonstrated that EPL inhibited atrial fibrosis specifically and decreased mac- rophage accumulation in the atria of these mice. Results from immunohistochemistry and western blotting showed that EPL attenuated protein expression of fibrosis-related molecules such as connective tissue growth factor (CTGF) and fibronectin in the atria of Tx mice. In culture, EPL inhibited gene expression of fibrosis-related molecules such as fibronectin, ct-SMA, and CTGF in TGF-β1-stimulated atrial fibroblasts, Finally, using a co-culture system, we showed that TGF-β1 stimulated atrial fi- broblasts induced migration of macrophages and this was blocked by EPL. EPL also blocked TGF-β1 induced gene expression of intedeukin-6 (IL-6) in atrial fibroblasts. Therefore, we conclude that EPL attenuated atrial fibrosis and macrophage infiltra- tion in Tx mice. 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subjects Animals
Biomedical and Life Sciences
Blotting, Western
Cells, Cultured
Coculture Techniques
Connective Tissue Growth Factor - genetics
Connective Tissue Growth Factor - metabolism
Fibroblasts - cytology
Fibroblasts - drug effects
Fibroblasts - metabolism
Fibronectins - genetics
Fibronectins - metabolism
Fibrosis - genetics
Fibrosis - prevention & control
Gene Expression - drug effects
Heart Atria - metabolism
Heart Atria - pathology
Interleukin-6 - genetics
Interleukin-6 - metabolism
Life Sciences
Macrophages - cytology
Macrophages - drug effects
Macrophages - metabolism
Male
Mice
Mice, Inbred C57BL
Mice, Transgenic
Microscopy, Fluorescence
Mineralocorticoid Receptor Antagonists - pharmacology
Mutation
Myocardium - metabolism
Myocardium - pathology
Research Paper
Reverse Transcriptase Polymerase Chain Reaction
Spironolactone - analogs & derivatives
Spironolactone - pharmacology
TGF-β1
Transforming Growth Factor beta1 - genetics
Transforming Growth Factor beta1 - metabolism
Transforming Growth Factor beta1 - pharmacology
Western印迹
基因突变
心房
成纤维细胞
纤维化
结缔组织生长因子
转基因小鼠
title Eplerenone inhibits atrial fibrosis in mutant TGF-β1 transgenic mice
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