title: Assessment of reactive oxygen species production in cultured equine skeletal myoblasts in response to conditions of anoxia followed by reoxygenation with or without exposure to peroxidases.
abstract: OBJECTIVE
  To culture equine myoblasts from muscle microbiopsy specimens, examine myoblast production of reactive oxygen species (ROS) in conditions of anoxia followed by reoxygenation, and assess the effects of horseradish peroxidase (HRP) and myeloperoxidase (MPO) on ROS production.
  
  
  METHODS
  5 healthy horses (5 to 15 years old).
  
  
  METHODS
  Equine skeletal myoblast cultures were derived from 1 or 2 microbiopsy specimens obtained from a triceps brachii muscle of each horse. Cultured myoblasts were exposed to conditions of anoxia followed by reoxygenation or to conditions of normoxia (control cells). Cell production of ROS in the presence or absence of HRP or MPO was assessed by use of a gas chromatography method, after which cells were treated with a 3,3'-diaminobenzidine chromogen solution to detect peroxidase binding.
  
  
  RESULTS
  Equine skeletal myoblasts were successfully cultured from microbiopsy specimens. In response to anoxia and reoxygenation, ROS production of myoblasts increased by 71%, compared with that of control cells. When experiments were performed in the presence of HRP or MPO, ROS production in myoblasts exposed to anoxia and reoxygenation was increased by 228% and 183%, respectively, compared with findings for control cells. Chromogen reaction revealed a close adherence of peroxidases to cells, even after several washes.
  
  
  CONCLUSIONS
  Results indicated that equine skeletal myoblast cultures can be generated from muscle microbiopsy specimens. Anoxia-reoxygenation-treated myoblasts produced ROS, and production was enhanced in the presence of peroxidases. This experimental model could be used to study the damaging effect of exercise on muscles in athletic horses.
authors.affiliation: Center for Oxygen Research and Development, Institute of Chemistry, University of Liège, Sart Tilman, 4000 Liège, Belgium. J.ceusters@ulg.ac.be
authors.forename: Justine D
authors.initials: JD
authors.lastname: Ceusters
authors.forename: Ange A
authors.initials: AA
authors.lastname: Mouithys-Mickalad
authors.forename: Geoffroy
authors.initials: G
authors.lastname: de la Rebière de Pouyade
authors.forename: Thierry J
authors.initials: TJ
authors.lastname: Franck
authors.forename: Dominique M
authors.initials: DM
authors.lastname: Votion
authors.forename: Ginette P
authors.initials: GP
authors.lastname: Deby-Dupont
authors.forename: Didier A
authors.initials: DA
authors.lastname: Serteyn
mesh_terms: D000818:Animals; D002849:Chromatography, Gas / Q000662:veterinary; D006734:Horse Diseases / Q000473:pathology*; D006735:Horseradish Peroxidase / Q000378:metabolism / Q000494:pharmacology; D006736:Horses; D000860:Hypoxia / Q000473:pathology / Q000662:veterinary*; D018485:Muscle Fibers, Skeletal / Q000166:cytology / Q000378:metabolism*; D009124:Muscle Proteins / Q000378:metabolism*; D032448:Myoblasts, Skeletal / Q000166:cytology / Q000378:metabolism*; D010100:Oxygen / Q000494:pharmacology*; D009195:Peroxidase / Q000378:metabolism / Q000494:pharmacology; D017382:Reactive Oxygen Species / Q000378:metabolism*
chemical_list: D009124:Muscle Proteins; D017382:Reactive Oxygen Species; D006735:Horseradish Peroxidase; D009195:Peroxidase; D010100:Oxygen