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Journal Article
Foxm1 transcription factor is required for lung fibrosis and epithelial-to-mesenchymal transition
2013
Overview
Alveolar epithelial cells (AECs) participate in the pathogenesis of pulmonary fibrosis, producing pro‐inflammatory mediators and undergoing epithelial‐to‐mesenchymal transition (EMT). Herein, we demonstrated the critical role of Forkhead Box M1 (Foxm1) transcription factor in radiation‐induced pulmonary fibrosis. Foxm1 was induced in AECs following lung irradiation. Transgenic expression of an activated Foxm1 transcript in AECs enhanced radiation‐induced pneumonitis and pulmonary fibrosis, and increased the expression of
IL‐1
β,
Ccl2
,
Cxcl5
,
Snail1
,
Zeb1
,
Zeb2
and
Foxf1
. Conditional deletion of Foxm1 from respiratory epithelial cells decreased radiation‐induced pulmonary fibrosis and prevented the increase in EMT‐associated gene expression. siRNA‐mediated inhibition of Foxm1 prevented TGF‐β‐induced EMT
in vitro
. Foxm1 bound to and increased promoter activity of the
Snail1
gene, a critical transcriptional regulator of EMT. Expression of Snail1 restored TGF‐β‐induced loss of E‐cadherin in Foxm1‐deficient cells
in vitro
. Lineage‐tracing studies demonstrated that Foxm1 increased EMT during radiation‐induced pulmonary fibrosis
in vivo
. Foxm1 is required for radiation‐induced pulmonary fibrosis by enhancing the expression of genes critical for lung inflammation and EMT.
This study establishes the
in vivo
relevance of FoxM1 in the context of radiation‐induced fibrosis. FoxM1 ablation in the respiratory epithelium supports a regulatory role during EMT and pulmonary inflammation that could become of therapeutic relevance.
Publisher
John Wiley & Sons, Ltd,Nature Publishing Group UK,Springer Nature B.V,Nature Publishing Group
Subject
/ EMBO09
/ EMBO24
/ EMBO37
/ EMT
/ Epithelial-Mesenchymal Transition - genetics
/ Epithelial-Mesenchymal Transition - physiology
/ Forkhead Transcription Factors - genetics
/ Forkhead Transcription Factors - metabolism
/ Forkhead Transcription Factors - physiology
/ Foxm1
/ Gene Expression Regulation - physiology
/ Humans
/ Lungs
/ Mice
/ Pulmonary Fibrosis - etiology
/ Pulmonary Fibrosis - genetics
/ Pulmonary Fibrosis - pathology
/ Radiation Injuries, Experimental - genetics
/ Radiation Injuries, Experimental - metabolism
/ Radiation Injuries, Experimental - pathology
/ radiation-induced lung fibrosis
/ RNA
/ Snail1
