A glucagon-like peptide-1 receptor antagonist reduces the insulin response to a glycemic meal in ponies.

Horses and ponies are prone to suffer from laminitis if they produce too much insulin after eating a high-sugar/starch meal. Laminitis associated with high insulin is very painful and can result in the affected animals having to be put down. The reason why some ponies over-produce insulin is not known. However, we do know that small molecules produced in the upper intestine contribute to the problem. In this study we blocked the action of these molecules, to see if we could reduce the insulin released after a meal that was high in soluble carbohydrate (starch and sugar) content, in ponies. Using a specially designed drug, we were able to reduce insulin responses to the meal by over 20%. None of the ponies had any clinical problems in this study. This study helped us to explain why some animals produce excessive insulin; this compound may even have potential as a future therapy. However, whilst a promising finding, this effect was not as strong as it needs to be to help prevent laminitis in all animals. The next step is to test the drug at different doses, and under varying conditions, to see whether we can improve its performance.