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Transforming growth factor (TGF)-β1-induced miR-133a inhibits myofibroblast differentiation and pulmonary fibrosis
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Transforming growth factor (TGF)-β1-induced miR-133a inhibits myofibroblast differentiation and pulmonary fibrosis
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Journal Article
Transforming growth factor (TGF)-β1-induced miR-133a inhibits myofibroblast differentiation and pulmonary fibrosis
2019
Overview
Transforming growth factor (TGF)-β1, a main profibrogenic cytokine in the progression of idiopathic pulmonary fibrosis (IPF), induces differentiation of pulmonary fibroblasts to myofibroblasts that produce high levels of collagen, leading to concomitantly loss of lung elasticity and function. Recent studies implicate the importance of microRNAs (miRNAs) in IPF but their regulation and individual pathological roles remain largely unknown. We used both RNA sequencing and quantitative RT-PCR strategies to systematically study TGF-β1-induced alternations of miRNAs in human lung fibroblasts (HFL). Our data show that miR-133a was significantly upregulated by TGF-β1 in a time- and concentration-dependent manner. Surprisingly, miR-133a inhibits TGF-β1-induced myofibroblast differentiation whereas miR-133a inhibitor enhances TGF-β1-induced myofibroblast differentiation. Interestingly, quantitative proteomics analysis indicates that miR-133a attenuates myofibroblast differentiation via targeting multiple components of TGF-β1 profibrogenic pathways. Western blot analysis confirmed that miR-133a down-regulates TGF-β1-induced expression of classic myofibroblast differentiation markers such as ɑ-smooth muscle actin (ɑ-SMA), connective tissue growth factor (CTGF) and collagens. miRNA Target Searcher analysis and luciferase reporter assays indicate that TGF-β receptor 1, CTGF and collagen type 1-alpha1 (Col1a1) are direct targets of miR-133a. More importantly, miR-133a gene transferred into lung tissues ameliorated bleomycin-induced pulmonary fibrosis in mice. Together, our study identified TGF-β1-induced miR-133a as an anti-fibrotic factor. It functions as a feed-back negative regulator of TGF-β1 profibrogenic pathways. Thus, manipulations of miR-133a expression may provide a new therapeutic strategy to halt and perhaps even partially reverse the progression of IPF.
Publisher
Nature Publishing Group UK,Springer Nature B.V
Subject
/ 14/19
/ 38
/ 38/77
/ 82/58
/ Actin
/ Animals
/ Biomedical and Life Sciences
/ Cell Differentiation - drug effects
/ Cell Differentiation - genetics
/ Collagen Type I - metabolism
/ Collagen Type I, alpha 1 Chain
/ Connective tissue growth factor
/ Connective Tissue Growth Factor - genetics
/ Connective Tissue Growth Factor - metabolism
/ Female
/ Fibrosis
/ Humans
/ Idiopathic Pulmonary Fibrosis - chemically induced
/ Idiopathic Pulmonary Fibrosis - genetics
/ Idiopathic Pulmonary Fibrosis - metabolism
/ Idiopathic Pulmonary Fibrosis - pathology
/ Mice
/ miRNA
/ Myofibroblasts - drug effects
/ p38 Mitogen-Activated Protein Kinases - genetics
/ p38 Mitogen-Activated Protein Kinases - metabolism
/ Transforming Growth Factor beta1 - genetics
/ Transforming Growth Factor beta1 - metabolism
