Nuclear magnetic resonance-based metabonomic study of early time point laminitis in an oligofructose-overload model.
Authors: Keller M D, Pollitt C C, Marx U C
Journal: Equine veterinary journal
Summary
# Editorial Summary Researchers used nuclear magnetic resonance (NMR) metabonomics to identify metabolic changes in blood during the early stages of oligofructose-induced laminitis, an unbiased approach that can detect unexpected biochemical shifts rather than targeting predetermined markers. Blood samples were collected before and at three-hourly intervals for 24 hours following oligofructose administration in an established laminitis model, with plasma analysed using one-dimensional proton NMR spectroscopy and statistical comparison of metabolite profiles. Over 20 metabolites were identified, confirming known changes such as elevated lactate whilst revealing two novel findings: the unexpected presence of oligofructose and its derivatives circulating in plasma (despite being considered indigestible in the small intestine), and a significant increase in phosphatidylcholine and low-density lipoprotein levels after oligofructose administration. The rise in phosphatidylcholine is consistent with breakdown of the large intestinal mucosa and increased mucosal permeability—a potential key mechanism in laminitis development. These findings warrant investigation into absorption pathways for oligofructose through the intestinal wall, particularly given its use in commercial equine feedstuffs, and suggest that phospholipid profiling may offer early indicators of mucosal compromise during laminitis pathogenesis.
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Practical Takeaways
- •Oligofructose in feedstuffs may be absorbed through damaged intestinal mucosa; consider feed composition in laminitis-prone horses and monitor gut health closely
- •Phospholipid markers in blood could serve as early diagnostic indicators of intestinal wall compromise during laminitis development, potentially enabling earlier intervention
- •NMR metabolic profiling offers a non-targeted approach to detecting unexpected pathophysiological changes in laminitis; horses with acute laminitis risk should have baseline metabolic assessment
Key Findings
- •NMR metabonomics identified >20 metabolite changes in blood plasma during early laminitis development, confirming known changes like elevated lactate
- •Oligofructose and its derivatives were detected in plasma, indicating unexpected absorption through the intestinal mucosa despite being considered small intestine indigestible
- •Increased phosphatidylcholine and low-density lipoprotein levels post-oligofructose administration suggest breakdown of the large intestinal mucosal layer and increased gut permeability