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Related Experiment Video

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Refined Murine Model of Idiopathic Pulmonary Fibrosis
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PM2.5 promotes pulmonary fibrosis by mitochondrial dysfunction.

En-Ming Chang1, Chia-Chia Chao2, Mei-Ting Wang3

  • 1Department of Respiratory Care, Shin Kong Wu Ho Su Memorial Hospital, Taipei City, Taiwan.

Environmental Toxicology
|May 1, 2023
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Summary

Particulate matter 2.5 (PM2.5) exposure triggers mitochondrial fragmentation and epithelial-mesenchymal transition (EMT) in lung cells, driving pulmonary fibrosis. Promoting mitochondrial fusion reversed these harmful effects, suggesting a therapeutic target for PM2.5-induced lung disease.

Keywords:
PM2.5mitochondrial dysfunctionpulmonary fibrosis

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Area of Science:

  • Environmental Health
  • Cell Biology
  • Pulmonary Medicine

Background:

  • Pulmonary fibrosis is an irreversible lung disease characterized by scarring.
  • Atmospheric particulate matter 2.5 (PM2.5) is a known risk factor for lung diseases, including pulmonary fibrosis.
  • The precise molecular mechanisms of PM2.5-induced pulmonary fibrosis in alveolar cells remain unclear.

Purpose of the Study:

  • To investigate the molecular mechanisms underlying PM2.5-induced pulmonary fibrosis in type II alveolar epithelial (AEII) cells.
  • To explore the role of mitochondrial dysfunction and epithelial-mesenchymal transition (EMT) in this process.
  • To evaluate the potential of targeting mitochondrial dynamics for therapeutic intervention.

Main Methods:

  • Exposure of AEII cells and mouse lung tissue to PM2.5.
  • RNA sequencing (RNA-seq) for gene expression analysis.
  • Assessment of cell morphology, mitochondrial membrane potential (MMP), and mitochondrial dynamics (Mfn1, Mfn2, Drp1 expression).
  • In vivo studies using immunohistochemistry (IHC) to analyze lung tissue collagen accumulation and protein expression.

Main Results:

  • PM2.5 exposure stimulated EMT and mitochondrial dysfunction in AEII cells, evidenced by altered gene expression, cell morphology changes, decreased MMP, and mitochondrial fragmentation.
  • PM2.5 altered the expression of mitochondrial dynamics proteins (Mfn1, Mfn2, Drp1) in both AEII cells and lung tissue.
  • In vivo PM2.5 exposure led to increased collagen accumulation in lung tissue.
  • Pretreatment with a mitochondrial fusion promoter (M1) reversed PM2.5-induced mitochondrial dysfunction and EMT in AEII cells.

Conclusions:

  • Mitochondrial fragmentation in AEII cells plays a critical role in PM2.5-induced pulmonary fibrosis.
  • PM2.5 exposure disrupts mitochondrial dynamics, contributing to lung tissue damage and fibrosis.
  • Targeting mitochondrial fusion presents a potential therapeutic strategy for mitigating PM2.5-related pulmonary fibrosis.