Title: Differences in polymorphonucleocyte function and local inflammatory response between horses and ponies
Authors: Wilmink, JM ×
Veenman, JN
van den Boom, R
Rutten, VPMG
Niewold, Theodoor
Broekhuisen-Davies, JM
Lees, P
Armstrong, S
van Weeren, PR
Barneveld, A #
Issue Date: 2003
Series Title: Equine Veterinary Journal vol:35 issue:6 pages:561-569
Conference: date:Univ Utrecht, Fac Vet Med, Dept Equine Sci, NL-3584 CM Utrecht, Netherlands; Univ Utrecht, Fac Vet Med, Dept Infect Dis & Immunol, NL-3584 CL Utrecht, Netherlands; Inst Anim Sci & Hlth, Dept Immunol Pathobiol & Epidemiol, NL-8200 AB Lelystad, Netherlands; Univ London Royal Vet Coll, Hatfield AL9 7TA, Herts, England
Abstract: Reasons for performing study: Wound healing proceeds faster in ponies than in horses and complications during healing, such as wound infection, occur less frequently in ponies. Earlier studies suggested that this difference might be related to differences in the initial post traumatic inflammatory response. Hypothesis: That polymorphonuclear leucocyte (PMN) function and profiles of Immoral factors in local inflammatory processes are different in horses and ponies. Methods: PMNs were isolated from venous blood of horses and ponies. Chemotaxis and reactive oxygen species (ROS) production was determined. Tissue cages were implanted in limbs and necks of horses and ponies and injected with carrageenan and, 3 weeks later, with LPS. In sequential samples of inflammatory exudate, the numbers of macrophages and PMNs and the production of PGE(2), TNFalpha, IL-1, IL-6 and chemoattractants were determined. Results: In vitro ROS production of PMNs was significantly higher in ponies than in horses, whereas in vitro PMN chemotaxis was significantly lower in ponies. In the tissue cages for both stimuli, the production of IL-1 and chemoattractants was significantly higher in ponies than in horses and remained so towards the end of the observation period in ponies. Conclusions: This study demonstrated a higher production of various inflammatory mediators by pony leucocytes. Despite the lower in vitro chemotaxis of pony PMNs, this higher in vivo production resulted in a stronger initial inflammatory response in ponies, as has been reported in studies on wound healing, through the attraction of leucocytes and triggering of the production of other cytokines. A stronger initial inflammation may promote healing by more rapid elemination of contaminants and earlier transition to repair. Potential relevance: Modulation of the initial inflammatory response might therefore be a valid option for therapeutic intervention in cases of problematic wound healing. Further, the intraspecies differences in leucocyte function may have an impact on many fields in equine medicine.
ISSN: 0425-1644
Publication status: published
KU Leuven publication type: IT
Appears in Collections:Division of Livestock-Nutrition-Quality (-)
× corresponding author
# (joint) last author

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