Effect of sugar metabolite methylglyoxal on equine lamellar explants: An ex vivo model of laminitis.
Authors: Vercelli Cristina, Tursi Massimiliano, Miretti Silvia, Giusto Gessica, Gandini Marco, Re Giovanni, Valle Emanuela
Journal: PloS one
Summary
# Editorial Summary: Methylglyoxal and Equine Laminitis Laminitis pathogenesis remains poorly understood despite its devastating clinical impact, though mounting evidence implicates metabolic dysfunction as a central mechanism. Researchers used an ex vivo explant model to expose equine hoof tissue samples to varying concentrations of methylglyoxal (MG)—a reactive byproduct of glycolysis that may accumulate systemically during digestion—and assessed structural integrity, histological changes, and expression of matrix-remodelling enzymes (MMPs and TIMPs) over 24 and 48 hours. High MG concentrations induced macroscopic and microscopic changes consistent with laminitis pathology, with mechanical separation force testing demonstrating significant weakening of lamellar tissue at 24 hours with high-dose exposure or 48 hours with lower doses. Gene expression data showed altered MMP-2, MMP-14, and TIMP-2 levels consistent with the observed tissue degradation, establishing a plausible biochemical mechanism linking carbonyl stress to lamellar failure. These findings suggest that managing blood glucose and preventing excessive MG production—through dietary modification, exercise, and metabolic control—may represent an underexplored preventative strategy for laminitis, particularly in susceptible populations such as those with equine metabolic syndrome or following grain overload incidents.
Read the full abstract on PubMed
Practical Takeaways
- •Dietary sugar management may be critical in laminitis prevention, as excessive glucose metabolism producing methylglyoxal could directly damage lamellar tissue integrity
- •This mechanism supports the practice of restricting NSC (non-structural carbohydrate) intake in laminitis-prone horses, particularly during high-risk periods
- •Further research linking blood MG levels to clinical laminitis cases could help identify at-risk horses and refine dietary intervention protocols
Key Findings
- •High concentrations of methylglyoxal (MG) induced macroscopic and histological changes in equine hoof explants that mimicked laminitis pathology
- •MG-treated samples showed significant weakening of tissue separation force at 24 hours (high concentration) or 48 hours (lower doses)
- •MG altered gene expression of matrix metalloproteinases (MMP-2 and MMP-14) and tissue inhibitor of metalloproteinase (TIMP-2), supporting lamellar degradation mechanism
- •The ex vivo model suggests high circulating MG levels from sugar metabolism could be a plausible etiopathogenic mechanism for laminitis