title: Effect of strenuous exercise and ex vivo TLR3 and TLR4 stimulation on inflammatory gene expression in equine pulmonary leukocytes.
abstract: The effects of strenuous exercise and ex vivo stimulation of TLR3 and TLR4 pathways on the expression of six inflammatory genes in equine pulmonary leukocytes were investigated. The genes tested were interferon-beta (IFN-β), interleukin-1-beta (IL-1β), interleukin-6 (IL-6), interferon gamma-induced protein 10 (IP-10), chemokine (c-c motif) ligand 5 (RANTES) and tumor necrosis factor-alpha (TNF-α). We hypothesized that strenuous exercise would modulate basal gene expression on one hand and modulate the response to bacterial lipopolysaccharide (LPS) and to polyinosinic:polycytidylic acid (Poly IC) on the other hand. Eight young Thoroughbred mares were selected for the experiment. Bronchoalveolar lavages were performed on horses 48 h before and 24h after the completion of treadmill exercise until fatigue. Differential counts were performed on the bronchoalveolar lavage cells. Real-time PCR was used to quantify cytokine expression in pulmonary leukocytes. Target gene expression was normalized to the expression of three housekeeping genes (HKG). There were no significant differences in the mRNA expression of the six cytokines between pre-exercise and post-exercise cells. LPS and Poly IC induced respectively significant increases of TNF-α, IFN-β, IL-6, IL-1β, and TNF-α, IFN-β, IP-10 and RANTES, both before and after exercise. However, exercise induced a significant decrease of the genes response to LPS and Poly IC. These findings may suggest that strenuous treadmill exercise exerts a deleterious effect on part of the pulmonary immune response in horses 24h following an intense physical activity.
authors.affiliation: Department of Functional Sciences, Physiology, Faculty of Veterinary Medicine, University of Liège, Boulevard de Colonster 20, B42, B-4000 Liège, Belgium. clemence.mignot@hotmail.fr
authors.forename: Clémence C
authors.initials: CC
authors.lastname: Mignot
authors.forename: Dimitri
authors.initials: D
authors.lastname: Pirottin
authors.forename: Frédéric
authors.initials: F
authors.lastname: Farnir
authors.forename: Brieuc
authors.initials: B
authors.lastname: de Moffarts
authors.forename: Céline
authors.initials: C
authors.lastname: Molitor
authors.forename: Pierre
authors.initials: P
authors.lastname: Lekeux
authors.forename: Tatiana
authors.initials: T
authors.lastname: Art
mesh_terms: D000818:Animals; D001483:Base Sequence; D001992:Bronchoalveolar Lavage Fluid / Q000166:cytology / Q000276:immunology; D016207:Cytokines / Q000235:genetics; D005260:Female; D015870:Gene Expression; D006736:Horses / Q000235:genetics* / Q000276:immunology* / Q000502:physiology; D066298:In Vitro Techniques; D018836:Inflammation Mediators / Q000378:metabolism; D007962:Leukocytes / Q000187:drug effects / Q000276:immunology; D008070:Lipopolysaccharides / Q000494:pharmacology; D005082:Physical Exertion / Q000235:genetics* / Q000276:immunology*; D011070:Poly I-C / Q000494:pharmacology; D012333:RNA, Messenger / Q000235:genetics; D051196:Toll-Like Receptor 3 / Q000276:immunology*; D051197:Toll-Like Receptor 4 / Q000276:immunology*
chemical_list: D016207:Cytokines; D018836:Inflammation Mediators; D008070:Lipopolysaccharides; D012333:RNA, Messenger; D051196:Toll-Like Receptor 3; D051197:Toll-Like Receptor 4; D011070:Poly I-C