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Refined Murine Model of Idiopathic Pulmonary Fibrosis
07:51

Refined Murine Model of Idiopathic Pulmonary Fibrosis

Published on: June 17, 2025

Signalling pathways from NADPH oxidase-4 to idiopathic pulmonary fibrosis

Bruno Crestani1, Valérie Besnard, Jorge Boczkowski

  • 1INSERM, Unité 700, Paris, France. bruno.crestani@bch.aphp.fr

The International Journal of Biochemistry & Cell Biology
|April 26, 2011
PubMed

Insights

NADPH oxidase (NOX) proteins, particularly NOX4, play a key role in idiopathic pulmonary fibrosis (IPF). Targeting NOX4 may offer a new therapeutic strategy for fibrotic lung diseases by inhibiting myofibroblast activity.

Area of Science:

  • Biochemistry
  • Cell Biology
  • Pulmonary Medicine

Background:

  • Idiopathic pulmonary fibrosis (IPF) is a progressive fibrotic lung disease with limited treatment options.
  • NADPH oxidase (NOX) enzymes generate reactive oxygen species (ROS) and are implicated in various cellular processes.
  • NOX proteins, especially NOX4, are increasingly recognized for their role in fibrotic diseases.

Purpose of the Study:

  • To review the role of NADPH oxidase/NOX proteins in the pathophysiology of idiopathic pulmonary fibrosis (IPF).
  • To explore the signalling pathways involving NOX proteins in IPF.
  • To evaluate NOX4 as a potential therapeutic target for IPF.

Main Methods:

  • Literature review of studies investigating NOX proteins in IPF.
  • Analysis of signalling pathways, including TGF-β and PDGF, in fibroblast activation.
  • Examination of NOX4 expression in IPF patient samples and animal models.

Main Results:

  • NOX4 is upregulated in pulmonary fibroblasts in response to TGF-β, a key fibrotic mediator.
  • NOX4-dependent ROS production is involved in myofibroblast proliferation, differentiation, migration, and extracellular matrix production via SMAD2/3 phosphorylation.
  • Genetic deletion of Nox4 in mice prevents bleomycin-induced pulmonary fibrosis.
  • Elevated NOX4 levels are observed in pulmonary fibroblasts from IPF patients.

Conclusions:

  • NOX4 is a critical mediator in IPF pathophysiology.
  • Targeting NOX4 presents a promising therapeutic strategy for fibrotic lung diseases.
  • Inhibition of NOX4 could specifically target disease-driving myofibroblasts in IPF.

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