Ethyl pyruvate diminishes the inflammatory response to lipopolysaccharide infusion in horses
Article first published online: 3 SEP 2012
© 2012 EVJ Ltd
Equine Veterinary Journal
Volume 45, Issue 3, pages 333–339, May 2013
How to Cite
Jacobs, C. C., Holcombe, S. J., Cook, V. L., Gandy, J. C., Hauptman, J. G. and Sordillo, L. M. (2013), Ethyl pyruvate diminishes the inflammatory response to lipopolysaccharide infusion in horses. Equine Veterinary Journal, 45: 333–339. doi: 10.1111/j.2042-3306.2012.00634.x
- Issue published online: 9 APR 2013
- Article first published online: 3 SEP 2012
- Accepted manuscript online: 19 JUL 2012 11:29AM EST
- Received: 26.04.12; Accepted: 11.07.12
Vol. 46, Issue 1, 123, Article first published online: 11 DEC 2013
- ethyl pyruvate;
- flunixin meglumine;
Reasons for performing the study: Endotoxaemia contributes to morbidity and mortality in horses with colic due to inflammatory cascade activation. Effective therapeutic interventions are limited for these horses. Ethyl pyruvate (EP), an anti-inflammatory agent that alters the expression of proinflammatory cytokines, improved survival and organ function in sepsis and gastrointestinal injury in rodents and swine. Therapeutic efficacy of EP is unknown in endotoxaemic horses.
Objectives: Determine the effects of EP on signs of endotoxaemia and expression of proinflammatory cytokines following administration of lipopolysaccharide (LPS) in horses.
Methods: Horses received 30 ng/kg bwt LPS in saline to induce signs of endotoxaemia. Next, horses received lactated Ringer's solution (LRS), (n = 6), 150 mg/kg bwt EP in LRS, (n = 6), or 1.1 mg/kg bwt flunixin meglumine (FM), (n = 6). Controls received saline followed by LRS (n = 6). Physical examinations, behaviour pain scores and blood for clinical pathological testing and gene expression were obtained at predetermined intervals for 24 h.
Results: Lipopolysaccharide infusion produced clinical and clinicopathological signs of endotoxaemia and increased expression of tumour necrosis factor alpha (TNFα), interleukin 6 (IL-6) and IL-8 (P<0.001) compared with controls. Leucopenia and neutropenia occurred in all horses that received LPS. Horses treated with EP and FM had significantly (P<0.0001) reduced pain scores compared with horses receiving LPS followed by LRS. Flunixin meglumine was significantly more effective at ameliorating fever compared with EP. Both EP and FM significantly diminished TNFα expression. Ethyl pyruvate significantly decreased, but FM significantly increased, IL-6 expression. Neither EP nor FM altered IL-8 expression.
Conclusions and potential relevance: Ethyl pyruvate administered following LPS diminished the clinical effects of endotoxaemia and decreased proinflammatory gene expression in horses. Ethyl pyruvate suppressed expression of proinflammatory cytokines better than FM. However, FM was a superior anti-pyretic compared with EP. Ethyl pyruvate may have therapeutic applications in endotoxaemic horses.