Document Detail

Assessment of exercise-induced alterations in neutrophil function in horses.
MedLine Citation:
PMID:  17975974     Owner:  NLM     Status:  MEDLINE    
OBJECTIVE: To evaluate the effects of a standardized exercise test to exhaustion in horses on leukocyte function ex vivo. ANIMALS: 6 Thoroughbred geldings. PROCEDURES: Blood samples were obtained from each horse before exercise; at exhaustion (termed failure); and at 2, 6, 24, 48, and 72 hours after exercise to evaluate hematologic changes, rate of leukocyte apoptosis, and leukocyte production of reactive oxygen species (ROS) ex vivo. To assess leukocyte function, leukocyte ROS production in response to stimulation with lipopolysaccharide, peptidoglycan, zymosan, and phorbol myristate acetate was evaluated. Apoptosis was evaluated via assessment of caspase activity in leukocyte lysates. RESULTS: In response to lipopolysaccharide, production of ROS by leukocytes was significantly increased at 2 hours and remained increased (albeit not significantly) at 6 hours after exercise, compared with the preexercise value. In the absence of any stimulus, leukocyte ROS production was significantly increased at 6 and 24 hours after exercise. In contrast, ROS production in response to phorbol myristate acetate was significantly decreased at 6, 24, and 72 hours after exercise. Leukocyte ROS production induced by zymosan or peptidoglycan was not altered by exercise. Leukocytosis was evident for 24 hours after exercise, and neutrophilia was detected during the first 6 hours. A significant increase in the rate of leukocyte apoptosis was detected at failure and 72 hours after exercise. CONCLUSIONS AND CLINICAL RELEVANCE: Results indicated that strenuous exercise undertaken by horses causes alterations in innate immune system functions, some of which persist for as long as 72 hours after exercise.
Douglas C Donovan; Christie A Jackson; Patrick T Colahan; Natalie N Norton; Joan L Clapper; James N Moore; David J Hurley
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Publication Detail:
Type:  Journal Article; Research Support, Non-U.S. Gov't    
Journal Detail:
Title:  American journal of veterinary research     Volume:  68     ISSN:  0002-9645     ISO Abbreviation:  Am. J. Vet. Res.     Publication Date:  2007 Nov 
Date Detail:
Created Date:  2007-11-02     Completed Date:  2008-01-10     Revised Date:  -    
Medline Journal Info:
Nlm Unique ID:  0375011     Medline TA:  Am J Vet Res     Country:  United States    
Other Details:
Languages:  eng     Pagination:  1198-204     Citation Subset:  IM    
Department of Population Health and Large Animal Medicine, College of Veterinary Medicine, University of Georgia, Athens, GA 30602, USA.
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MeSH Terms
Apoptosis / immunology
Caspases / metabolism
Horses / immunology*,  metabolism
Leukocyte Count / veterinary
Lipopolysaccharides / pharmacology
Neutrophil Activation / immunology
Neutrophils / immunology*,  metabolism,  pathology
Peptidoglycan / pharmacology
Physical Conditioning, Animal / physiology*
Reactive Oxygen Species / immunology
Tetradecanoylphorbol Acetate / pharmacology
Zymosan / immunology,  pharmacology
Reg. No./Substance:
0/Lipopolysaccharides; 0/Peptidoglycan; 0/Reactive Oxygen Species; 16561-29-8/Tetradecanoylphorbol Acetate; 9010-72-4/Zymosan; EC 3.4.22.-/Caspases

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