Pulmonary arterial oxidative stress in equine recurrent airway obstruction
Authors: Venugopal Changaram, Mariappan Nithya, Elks Carrie, Francis Joseph
Journal: The FASEB Journal
Summary
# Editorial Summary: Pulmonary Arterial Oxidative Stress in Equine Recurrent Airway Obstruction Recurrent airway obstruction (RAO) in horses involves dysregulated inflammatory responses characterised by excessive reactive oxygen species (ROS) production from activated immune cells, which subsequently trigger pro-inflammatory gene expression and alter cellular signalling pathways. Changaram and colleagues measured ROS levels directly in pulmonary arterial tissue rings harvested from RAO-affected and unaffected horses using electron paramagnetic resonance spectroscopy, a precise quantitative technique, and investigated whether pentoxifylline—an agent that inhibits tumour necrosis factor-alpha (TNFα)—could mitigate oxidative stress. Arterial rings from RAO-affected horses demonstrated significantly elevated total ROS concentrations compared with controls, and incubation with pentoxifylline substantially reduced ROS levels in the diseased tissue. These findings suggest that TNFα-mediated oxidative stress contributes meaningfully to RAO pathogenesis and that pentoxifylline warrants investigation as an adjunctive therapeutic option to reduce the oxidative burden on pulmonary vasculature in affected horses. For practitioners managing RAO cases, this work provides mechanistic support for exploring anti-inflammatory agents targeting cytokine pathways alongside conventional airway management strategies.
Read the full abstract on the publisher's site
Practical Takeaways
- •Pentoxifylline may offer a novel therapeutic approach to manage oxidative stress in RAO cases by reducing inflammatory ROS production
- •Understanding that RAO involves dysregulated oxidative stress mechanisms suggests potential benefit from antioxidant or TNFα-modulating therapies alongside conventional management
- •This mechanistic work supports investigation of pentoxifylline as an adjunctive treatment for RAO, though clinical efficacy trials are needed before routine practice application
Key Findings
- •Total ROS levels were significantly elevated in pulmonary arterial rings from RAO-affected horses compared to unaffected controls
- •TNFα plays a key role in the inflammatory cascade driving oxidative stress in RAO pathogenesis
- •Pentoxifylline reduced ROS levels in arterial rings from RAO-affected horses in vitro
- •Oxidative stress from elevated ROS contributes to pathogenesis, severity, and therapeutic outcomes in equine RAO