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  • Author or Editor: Anamarie Bosman x
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Objective—To determine concentrations of cytokine mRNA in horses with exercise-induced pulmonary hemorrhage (EIPH) after racing.

Animals—97 Thoroughbreds.

Procedures—Following tracheobronchoscopy, the severity of EIPH was graded (scale of 0 to 4), and venous blood samples were collected from 10 horses in each grade. After RNA isolation and cDNA synthesis, real-time PCR assay was conducted to detect cytokinespecific mRNA for interleukin (IL)-1, IL-6, and IL-10; interferon (INF)-γ; and tumor necrosis factor (TNF)-α.

Results—Neither location nor grade of EIPH affected the expression of IL-1 and INF-γ. There was significantly greater overall expression of IL-6 mRNA at sea level, with significantly more IL-6 expressed in horses with grade 4 EIPH than in horses with grade 0, 1, or 2 EIPH. At a high altitude, no difference was detected for IL-6 expression among the various EIPH grades. There was significantly greater overall expression of TNF-α mRNA at a high altitude; however, there was no difference within the various grades of EIPH. Expression of IL-10 was significantly affected by grade of EIPH because horses with grade 3 EIPH expressed significantly more IL-10 mRNA than did horses with grade 0 or 2 EIPH; this expression was not affected by location.

Conclusions and Clinical Relevance—At sea level, increased IL-6 expression was associated with more severe EIPH, and altitude may affect gene expressions of the proinflammatory cytokine TNF-α and anti-inflammatory cytokine IL-6. Studies on protein concentrations of cytokine expression are needed. The pathophysiologic importance of these findings remains to be explained.

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in American Journal of Veterinary Research