Journal
AMERICAN JOURNAL OF VETERINARY RESEARCH
Volume 71, Issue 2, Pages 186-193Publisher
AMER VETERINARY MEDICAL ASSOC
DOI: 10.2460/ajvr.71.2.186
Keywords
-
Categories
Funding
- USDA Cooperative State Research, Education and Extension Service [2003-35204-1.3350, 2002-35204-12423]
- White Fox Farm Research Fund
Ask authors/readers for more resources
Objective-To provide insights into the role of prostaglandin F-2 alpha (PGF(2 alpha)) in the developmental stages of laminitis induced in horses by ingestion of black walnut heartwood extract (BWHE). Sample Population-10 adult mixed-breed horses. Procedures-Horses were separated into 2 groups and were euthanatized at 12 hours after placebo (water) administration (control horses) or after BWHE administration and development of Obel grade 1 laminitis. Blood samples were obtained to determine plasma PGF(2 alpha) concentrations hourly for the first 4 hours and subsequently every 2 hours after substance administration. Laminar arteries and veins were isolated, and responses to increasing concentrations of PGF(2 alpha) were measured before and after preincubation of blood vessels with prostanoid and thromboxane receptor antagonists SO 29,548, SC-19220, and AH 6809. Results-Plasma PGF(2 alpha) concentrations increased in horses given BWHE; the WBC count decreased concurrently. In control horses, PGF(2 alpha) was a potent contractile agonist for laminar veins but not for laminar arteries. In horses given BWHE, PGF(2 alpha) was similarly selective for laminar veins; however, the magnitude of PGF(2 alpha)-induced venoconstriction was less than that in control horses. After preincubation with SO 29,548, laminar veins from control horses responded to PGF(2 alpha) with a small degree of dilation, whereas laminar veins from horses given BWHE did not. Conclusions and Clinical Relevance-PGF(2 alpha) may play a role in the inflammatory and vascular dysfunction associated with the prodromal stages of laminitis. Prostanoids such as PGF(2 alpha) may be viable targets for the prevention of acute laminitis in horses. (Am J Vet Res 2010;71;186-193)
Authors
I am an author on this paper
Click your name to claim this paper and add it to your profile.
Reviews
Recommended
No Data Available