Equine lamellar energy metabolism studied using tissue microdialysis.
Authors: Medina-Torres C E, Pollitt C C, Underwood C, Castro-Olivera E M, Collins S N, Allavena R E, Richardson D W, van Eps A W
Journal: Veterinary journal (London, England : 1997)
Summary
# Editorial Summary: Equine Lamellar Energy Metabolism Understanding whether energy depletion drives laminitis pathophysiology requires direct measurement of metabolite concentrations within living lamellar tissue—a challenge this 2014 study addressed by developing and validating a minimally invasive microdialysis technique. Researchers inserted microdialysis probes through the white line to sample either lamellar dermis, sublamellar dermis, or skin dermis tissue, collecting samples every 2 hours over 24 hours and analysing glucose, lactate, pyruvate, urea and glycerol levels; importantly, the procedure proved well-tolerated with only mild histological responses and no lameness complications. Lamellar tissue demonstrated significantly lower glucose and higher lactate-to-glucose ratios compared with deeper sublamellar tissue and skin, alongside reduced pyruvate and urea concentrations, indicating that the lamellae operate under relatively hypoxic conditions with greater glucose consumption. These metabolic signatures suggest the lamellae rely heavily on anaerobic metabolism even under normal conditions, positioning this technique as a valuable tool for investigating whether the transition from aerobic to predominantly anaerobic energy metabolism represents a critical failure point in laminitis development. Farriers and veterinarians managing laminitis-prone horses may eventually benefit from this research direction, as it could reveal early biomarkers of lamellar energetic compromise before overt clinical disease manifests.
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Practical Takeaways
- •Lamellar microdialysis represents a new diagnostic tool to directly assess energy metabolism failure in laminitis cases, potentially improving understanding of disease mechanisms before clinical signs develop
- •The technique's safety profile and ability to monitor metabolite changes over time could allow practitioners and researchers to evaluate intervention effectiveness in real-time during acute laminitis cases
- •Normal lamellar tissue shows distinct metabolic characteristics (lower glucose, higher lactate:glucose ratio) compared to surrounding tissues, establishing baseline values for identifying pathological energy failure in laminitis
Key Findings
- •Tissue microdialysis through the white line is minimally invasive and well-tolerated with mild histological response and no clinical lameness complications over 1 month follow-up
- •Glucose concentrations were significantly lower in lamellar dermis compared to sublamellar dermis and skin (P<0.05), indicating higher glucose consumption in lamellar tissue
- •Lactate:glucose ratio was higher in lamellar dermis compared to sublamellar dermis and skin (P<0.05), suggesting anaerobic metabolism or lower perfusion in this tissue
- •Metabolite concentrations remained stable over 24-hour sampling period, demonstrating the technique's feasibility for dynamic monitoring of lamellar energy balance