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Antioxidant and inflammatory responses of healthy horses and horses affected by recurrent airway obstruction to inhaled ozone
Author(s) -
DEATON C. M.,
MARLIN D. J.,
SMITH N. C.,
ROBERTS C. A.,
HARRIS P. A.,
SCHROTER R. C.,
KELLY F. J.
Publication year - 2005
Publication title -
equine veterinary journal
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 0.82
H-Index - 87
eISSN - 2042-3306
pISSN - 0425-1644
DOI - 10.2746/0425164054530605
Subject(s) - medicine , airway obstruction , airway , antioxidant , ozone , horse , anesthesia , biology , chemistry , paleontology , biochemistry , organic chemistry
Summary Reasons for performing study : Inhaled ozone can induce oxidative injury and airway inflammation. Horses affected by recurrent airway obstruction (RAO) have a decreased pulmonary antioxidant capacity, which may render them more susceptible to oxidative challenge. It is currently unknown whether RAO‐affected horses are more susceptible to oxidative stress than those unaffected by RAO. Objectives : To determine whether ozone exposure induces greater oxidative stress and airway inflammation in RAO‐affected horses in remission than in healthy horses. Methods : Seven healthy control horses and 7 RAO‐affected horses were exposed to 0.8 ppm ozone for 2 h at rest. Results : At baseline, bronchoalveolar lavage fluid (BALF) ascorbic acid concentrations were lower in RAO‐affected horses than healthy controls. Ozone appeared to preferentially oxidise glutathione rather than ascorbic acid 6 h after exposure. Individual healthy and RAO‐affected horses demonstrated oxidation of BALF glutathione after ozone exposure. Overall, RAO‐affected horses did not demonstrate increased oxidative stress following ozone exposure, compared with healthy horses. Ozone did not induce significant airway inflammation in either group. Conclusions : RAO‐affected horses in remission are not more sensitive to ozone despite a decreased pulmonary antioxidant capacity. Sensitivity to ozone appears to be independent of initial pulmonary antioxidant status. Potential relevance : Horses with high susceptibility to oxidative stress may benefit from antioxidant supplementation.