Equine Asthma Does Not Affect Circulating Myostatin Concentrations in Horses.
Authors: Kowalik Sylwester, O'reilly Maisie, Niedźwiedź Artur, Kędzierski Witold
Journal: Animals : an open access journal from MDPI
Summary
# Editorial Summary Researchers investigating potential biomarkers for equine asthma measured circulating myostatin (MSTN) concentrations in 61 horses across three groups: clinically healthy young Thoroughbreds, healthy adult leisure horses, and confirmed asthmatic horses, with diagnosis supported by bronchoalveolar lavage cytology in 49 subjects. The rationale was compelling—human studies consistently demonstrate elevated plasma myostatin in severe asthma patients, and since myostatin suppresses muscle cell proliferation, it seemed plausible that the systemic inflammatory cascade of equine asthma might similarly elevate this myokine. Using ELISA analysis, asthmatic horses did show significantly higher circulating myostatin than young healthy racehorses (p < 0.05), but crucially, myostatin concentrations in asthmatic horses were indistinguishable from healthy adult leisure horses, undermining its diagnostic utility. Whilst this represents the first equine investigation of myostatin in asthma pathophysiology, the inconsistent findings suggest myostatin is unlikely to serve as a reliable standalone biomarker for early detection or confirmation of equine asthma, and further research should explore alternative myokine candidates or multi-marker diagnostic panels. For practitioners, this reinforces that whilst promising biomarkers continue to emerge, current diagnostic standards—particularly clinical examination combined with BAL cytology—remain the gold standard until validated alternatives are established.
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Practical Takeaways
- •Myostatin testing cannot currently be recommended as a diagnostic tool for equine asthma in clinical practice
- •Clinical examination and bronchoalveolar lavage fluid cytology remain the standard methods for confirming equine asthma diagnosis
- •Further research is needed before any blood-based biomarker can be validated for early detection of equine respiratory disease
Key Findings
- •Mean circulatory myostatin concentration was significantly higher in asthmatic horses compared to young healthy Thoroughbred racehorses (p < 0.05)
- •Myostatin concentration did not differ significantly between asthmatic horses and healthy adult leisure horses
- •Myostatin cannot be reliably used as a biomarker for early diagnosis of equine asthma based on current evidence
- •This is the first study to analyze plasma myostatin concentration in horses with equine asthma