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Updated: Oct 8, 2025
Refined Murine Model of Idiopathic Pulmonary Fibrosis
Published on: June 17, 2025
Sustained Club Cell Injury in Mice Induces Histopathologic Features of Deployment-Related Constrictive Bronchiolitis
Seagal Teitz-Tennenbaum1, Steven P Viglianti2, Ahmad Jomma1
1Research Service and the Pulmonary Section Medical Service, VA Ann Arbor Health System, Department of Veterans Affairs Health System, Ann Arbor, Michigan; Division of Pulmonary and Critical Care Medicine, Department of Internal Medicine, University of Michigan, Ann Arbor, Michigan.
Sustained club cell injury in mice causes lung inflammation and fibrosis, mimicking key features of deployment-related constrictive bronchiolitis (DRCB). Targeting club cell injury pathways may offer new treatments for this soldier’s lung disorder.
Area of Science:
- Pulmonary Medicine
- Toxicology
- Cell Biology
Background:
- Deployment-related constrictive bronchiolitis (DRCB) is a disabling lung disorder observed in soldiers.
- The precise pathogenesis of DRCB, particularly the role of inhalational injury, remains poorly understood.
- Club cells are crucial for airway epithelial repair following toxic exposures.
Purpose of the Study:
- To investigate the mechanisms underlying small airway fibrosis in a murine model.
- To determine if sustained club cell injury is sufficient to induce DRCB-like pathology.
- To identify potential therapeutic targets for DRCB.
Main Methods:
- A murine model with sustained targeted club cell injury was utilized.
- Histopathologic analysis assessed airway changes, inflammation, and fibrosis.
- Gene expression, cytokine production, and immune cell populations were analyzed.
- The role of alveolar macrophages was investigated through depletion studies.
Main Results:
- Sustained club cell injury led to acute weight loss, inflammation, and myeloid cell accumulation.
- Chronic injury induced oxidative stress, TGF-β activation, and collagen deposition.
- The injury model recapitulated key histopathologic features of DRCB, including epithelial metaplasia and airway thickening.
- Alveolar macrophage depletion reduced TGF-β activation and ameliorated bronchiolitis.
Conclusions:
- Sustained club cell injury is implicated in the development of DRCB.
- The study delineates specific molecular and cellular pathways involved in DRCB pathogenesis.
- These findings suggest potential biomarkers and therapeutic targets for DRCB.
