Antioxidant and inflammatory responses of healthy horses and horses affected by recurrent airway obstruction to inhaled ozone.
Authors: Deaton C M, Marlin D J, Smith N C, Roberts C A, Harris P A, Schroter R C, Kelly F J
Journal: Equine veterinary journal
Summary
# Editorial Summary Recurrent airway obstruction (RAO) compromises the lungs' natural antioxidant defences, raising the question of whether affected horses face heightened vulnerability when exposed to environmental oxidative stressors such as ozone. Deaton and colleagues exposed both healthy horses and those with RAO to inhaled ozone, then measured inflammatory markers and antioxidant responses in respiratory samples to determine whether disease status influenced susceptibility to oxidative injury. The RAO-affected group demonstrated exaggerated inflammatory responses and depleted antioxidant capacity following ozone exposure compared with healthy controls, confirming that compromised pulmonary defences substantially increase susceptibility to oxidative stress. For practitioners managing RAO cases, these findings underline the critical importance of minimising airway exposure to environmental oxidants—whether from ground-level ozone, poor air quality, or dusty stable conditions—as such exposures may trigger more severe inflammatory cascades in affected horses than in their healthy peers. This mechanistic insight supports stricter environmental management protocols for RAO horses and suggests that antioxidant supplementation strategies warrant consideration as part of a comprehensive disease management approach.
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Practical Takeaways
- •RAO-affected horses have compromised antioxidant defenses and may suffer greater respiratory damage from air quality problems; consider air quality management and stable environment optimization
- •Environmental ozone exposure presents a specific oxidative challenge for RAO horses; monitor air quality during high ozone days and adjust exercise/turnout accordingly
- •Enhanced nutritional antioxidant support may be particularly beneficial for RAO-affected horses to compensate for reduced pulmonary antioxidant capacity
Key Findings
- •RAO-affected horses have decreased pulmonary antioxidant capacity compared to healthy horses
- •Inhaled ozone induces oxidative injury and airway inflammation in equine lungs
- •RAO-affected horses may be more susceptible to oxidative stress from environmental challenges