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FOXL1 Regulates Lung Fibroblast Function via Multiple Mechanisms.

Naoya Miyashita1, Masafumi Horie2, Hiroshi I Suzuki3,4

  • 1Department of Respiratory Medicine, Graduate School of Medicine, and.

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|September 18, 2020
PubMed
Summary

Forkhead box L1 (FOXL1) is a key transcription factor in lung fibroblasts, regulating cell growth and function. Increased FOXL1 expression is linked to idiopathic pulmonary fibrosis, suggesting its role in disease pathogenesis.

Keywords:
FOXL1cap analysis of gene expressionfibroblastidiopathic pulmonary fibrosissuper-enhancer

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Area of Science:

  • Cell Biology
  • Molecular Biology
  • Pulmonary Medicine

Background:

  • Fibroblasts are crucial for organ structure, wound repair, and fibrosis.
  • Lung fibroblasts possess unique characteristics related to their pulmonary origin.

Purpose of the Study:

  • To investigate the functional roles of the transcription factor FOXL1 in lung fibroblasts.
  • To determine the association of FOXL1 with idiopathic pulmonary fibrosis (IPF).

Main Methods:

  • Analysis of FOXL1 transcripts, DNA methylation, and super-enhancer formation in lung fibroblasts.
  • RNA in situ hybridization and immunohistochemistry in normal lung tissue.
  • Transcriptome analysis and gene silencing (FOXL1 knockdown) in lung fibroblasts.

Main Results:

  • High FOXL1 transcripts, DNA hypomethylation, and super-enhancer formation were detected in lung fibroblasts.
  • FOXL1 regulates genes involved in fibroblast function, including TAZ/YAP and PDGFRα.
  • FOXL1 silencing impaired lung fibroblast growth and collagen gel contraction.
  • Increased FOXL1 mRNA expression was observed in IPF lung fibroblasts.

Conclusions:

  • FOXL1 is a key transcription factor regulating multiple functions of lung fibroblasts.
  • FOXL1 plays a significant role in the pathogenesis of idiopathic pulmonary fibrosis.