Plasma Activin A concentrations are not a useful biomarker for detecting insulin dysregulation and predicting laminitis risk in ponies.

This study researched the potential use of the plasma Activin A (AA) concentration as a marker for insulin dysregulation and risk prediction of laminitis in ponies, but found no strong correlation that would make it useful in practice.

Study Objectives and Methods

• The research was aimed at understanding the relationship between the baseline and 60-minute post oral sugar test (OST) plasma Activin A concentrations in ponies, and whether or not these could be used as a predictor for laminitis development within a period of six months.
• The study used a case-control method, involving 43 ponies that developed laminitis within a four-year period and an equivalent number of ponies that did not develop the condition, as controls.
• The plasma Activin A concentrations were measured at the baseline time (T0) and 60-minutes post-test (T60) using a validated Enzyme-Linkage Immunosorbent Assay (ELISA). Results were compared between the two groups at both points in time.
• The study also investigated possible correlations between the plasma Activin A concentrations and other previously measured metabolic markers using Spearman’s rank correlation coefficients.

Study Findings

• The findings showed a significant difference in plasma Activin A concentrations at T0 and T60 within both the laminitic and non-laminitic pony groups. However, no significant association was found between plasma Activin A (at either T0 or T60) and any other measured metabolic markers.
• The study acknowledges limitations in the sole reliance on single timepoints and retrospective analysis. This restricts the measures placed on temporal changes or fluctuations that might occur in the plasma Activin A concentrations.

Conclusions

• The conclusion of the research was that the plasma Activin A concentration is not a useful marker for insulin dysregulation or for predicting laminitis development in ponies.
• This research provides valuable insight, indicating that alternative markers or methods may need to be sought for predicting laminitis development in ponies.