title: Myeloperoxidase concentration in bronchoalveolar lavage fluid from healthy horses and those with recurrent airway obstruction.
abstract: The aim of this work was to measure the myeloperoxidase (MPO) concentration in bronchoalveolar lavage (BAL) fluid collected from horses with recurrent airway obstruction (RAO), both in crisis and in remission, as well as from healthy horses. Seven horses with RAO were exposed to moldy hay until the maximum change in pleural pressure was greater than 1.5 kPa. At that point, BAL was performed, and the total cell counts and percentages in the fluid were immediately determined. To measure the MPO concentration in BAL-fluid supernatant, we used a specific enzyme-linked immunosorbent assay with polyclonal antibodies against equine MPO. The tests were repeated on the horses with RAO after they had spent 2 mo on pasture. Six healthy horses serving as controls underwent the same tests. The absolute and relative neutrophil counts and the MPO concentration in the BAL fluid were significantly greater in the horses with an RAO crisis than in the control horses. After 2 mo on pasture, the horses that had been in RAO crisis were clinically normal, and their neutrophil counts and MPO levels in BAL fluid had significantly decreased; during remission their neutrophil counts were not significantly different from those in the healthy horses, but their MPO concentration remained significantly higher. This study showed that determining the MPO concentration in a horse's BAL fluid is technically possible and that during remission from RAO the concentration remains higher than normal. Thus, MPO may be a marker of neutrophil presence and activation in the lower airways.
authors.affiliation: Equine Sports Medicine Centre, Faculty of Veterinary Medicine, University of Liege, Belgium. Tatiana.art@ulg.ac.be
authors.forename: Tatiana
authors.initials: T
authors.lastname: Art
authors.forename: Thierry
authors.initials: T
authors.lastname: Franck
authors.forename: Pierre
authors.initials: P
authors.lastname: Lekeux
authors.forename: Brieuc
authors.initials: B
authors.lastname: de Moffarts
authors.forename: Laurent
authors.initials: L
authors.lastname: Couëtil
authors.forename: Martine
authors.initials: M
authors.lastname: Becker
authors.forename: Serge
authors.initials: S
authors.lastname: Kohnen
authors.forename: Ginette
authors.initials: G
authors.lastname: Deby-Dupont
authors.forename: Didier
authors.initials: D
authors.lastname: Serteyn
mesh_terms: D000818:Animals; D000906:Antibodies; D015415:Biomarkers / Q000378:metabolism; D001784:Blood Gas Analysis / Q000662:veterinary; D018893:Bronchoalveolar Lavage / Q000379:methods / Q000662:veterinary; D001992:Bronchoalveolar Lavage Fluid / Q000166:cytology*; D016022:Case-Control Studies; D002452:Cell Count / Q000662:veterinary; D004797:Enzyme-Linked Immunosorbent Assay / Q000379:methods / Q000662:veterinary; D006734:Horse Diseases / Q000201:enzymology*; D006736:Horses; D008173:Lung Diseases, Obstructive / Q000201:enzymology / Q000662:veterinary*; D009504:Neutrophils / Q000276:immunology*; D009195:Peroxidase / Q000032:analysis* / Q000097:blood; D012129:Respiratory Function Tests / Q000662:veterinary
chemical_list: D000906:Antibodies; D015415:Biomarkers; D009195:Peroxidase