Plasma Amino Acid Concentration in Obese Horses with/without Insulin Dysregulation and Laminitis.
Authors: Stoeckle Sabita Diana, Timmermann Detlef, Merle Roswitha, Gehlen Heidrun
Journal: Animals : an open access journal from MDPI
Summary
# Editorial Summary Hyperinsulaemia remains a critical factor in laminitis pathogenesis, yet its broader metabolic consequences—particularly effects on protein turnover—warrant closer examination in at-risk populations. Stoeckle and colleagues measured resting plasma amino acid profiles in 27 obese horses (five insulin-dysregulated without laminitis, 14 with insulin dysregulation, and eight with concurrent insulin dysregulation and laminitis) following a combined glucose-insulin test, comparing findings against lean controls. Three amino acids demonstrated significant differences between groups: citrulline and methionine were substantially lower in laminitic horses compared with obese, non-dysregulated animals, whilst gamma-aminobutyric acid (GABA) showed the most pronounced distinction, with insulin-dysregulated laminitic horses displaying concentrations less than 60% of those seen in insulin-dysregulated horses without laminitis. These alterations in amino acid metabolism suggest dysregulation extends beyond insulin and glucose homeostasis, potentially offering novel diagnostic markers or nutritional intervention targets for horses at laminitis risk, though the modest sample size necessitates replication before clinical translation becomes advisable.
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Practical Takeaways
- •Resting plasma amino acid concentrations, particularly citrulline, GABA, and methionine, differ significantly between obese horses and those with insulin dysregulation and laminitis, potentially offering a new diagnostic tool for laminitis risk assessment
- •These findings suggest amino acid metabolism is altered in hyperinsulinemic states and laminitis, which may warrant investigation of targeted dietary supplementation strategies for at-risk horses
- •Current evidence is preliminary; larger prospective studies are needed before plasma amino acid profiling can be reliably used in clinical practice for laminitis prediction or prevention
Key Findings
- •Obese horses without insulin dysregulation had significantly higher resting plasma citrulline (73.0 vs 49.2 nmol/mL, p=0.038) compared to insulin-dysregulated laminitic horses
- •GABA concentrations were elevated in obese and insulin-dysregulated horses (28.2-28.3 nmol/mL) compared to insulin-dysregulated laminitic horses (16.7 nmol/mL, p<0.001)
- •Methionine levels were significantly higher in obese horses (28.7 nmol/mL) versus insulin-dysregulated laminitic horses (20.1 nmol/mL, p=0.018)
- •Plasma amino acid profiling may have diagnostic potential for identifying laminitis risk in metabolically dysregulated horses