Effects of low-dose oligofructose treatment administered via nasogastric intubation on induction of laminitis and associated alterations in glucose and insulin dynamics in horses.
Authors: Kalck, Frank, Elliott, Boston
Journal: American journal of veterinary research
Summary
# Editorial Summary: Oligofructose-Induced Laminitis and Glucose Dysregulation Oligofructose administration via nasogastric tube reliably induces laminitis in horses whilst producing measurable alterations in glucose metabolism but not insulin secretion. Nineteen horses received either low-dose oligofructose (5.0 or 7.5 g/kg) or water control, with researchers measuring resting glucose and insulin concentrations alongside intravenous glucose tolerance testing before and after treatment. Seven of twelve treated horses developed clinical laminitis, with glucose area-under-the-curve values increasing significantly by 32–34% at 24–48 hours post-administration, yet resting insulin concentrations and insulin sensitivity indices remained unchanged across all groups. These findings suggest that hyperglycaemia rather than hyperinsulinaemia may be the primary metabolic driver in oligofructose-induced laminitis, challenging conventional assumptions about the disease mechanism. For practitioners managing at-risk horses or investigating laminitis aetiology, this work underscores the importance of monitoring glucose dynamics specifically and indicates that insulin resistance may not be a prerequisite for laminitis development in this model, potentially reframing our understanding of carbohydrate-related metabolic disease.
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Practical Takeaways
- •High-dose oligofructose administration (5–7.5 g/kg) is a reliable method to experimentally induce laminitis in horses, useful for understanding pathophysiology
- •Laminitis can be triggered via altered glucose dynamics independent of measurable changes in insulin secretion, suggesting glucose metabolism itself may be a trigger mechanism
- •Practitioners should be cautious with high-dose oligofructose supplementation in horses prone to metabolic disease, as severe glycaemic disturbance can precipitate acute laminitis
Key Findings
- •Nasogastric administration of oligofructose at 5.0 g/kg induced laminitis in 3 of 8 horses (37.5%), and at 7.5 g/kg induced laminitis in all 4 treated horses (100%)
- •Mean area under the glucose curve (AUCg) increased significantly by 34% at 24 hours and 32% at 48 hours post-treatment compared to baseline
- •No significant alterations in resting serum insulin concentration, area under the insulin curve (AUCi), or insulin sensitivity were detected following oligofructose treatment