The Immune Mechanisms of Severe Equine Asthma-Current Understanding and What Is Missing.
Authors: Simões Joana, Batista Mariana, Tilley Paula
Journal: Animals : an open access journal from MDPI
Summary
# Editorial Summary: The Immune Mechanisms of Severe Equine Asthma Severe equine asthma represents a complex chronic airway disease affecting genetically predisposed adult horses exposed to environmental aeroallergens, manifesting as airway inflammation, mucus accumulation, and bronchospasm—a condition that mirrors the heterogeneous nature of human asthma in its immunopathological mechanisms. Research has identified two critical chromosomal regions (ECA13 and ECA15) harbouring disease-associated genes, though findings remain inconsistent across studies, highlighting the intricate genetic architecture underlying disease susceptibility. The inflammatory cascade appears predominantly driven by T helper cell responses (Th1, Th2, and Th17 subsets), with neutrophilic inflammation emerging as a significant contributor to the chronic persistence of airway pathology rather than acute disease initiation alone. For practitioners, these insights suggest that individual horses may present with distinct immunological phenotypes requiring tailored management approaches, and that addressing the neutrophilic component of inflammation may prove crucial for improving long-term clinical outcomes. The persistent gaps in understanding the genetic-immunological interface present opportunities for future research to refine diagnostic markers and develop targeted therapeutic interventions that move beyond current empirical management strategies.
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Practical Takeaways
- •Severe equine asthma is a chronic condition in adult horses triggered by environmental aeroallergen exposure in genetically susceptible individuals; management should focus on minimizing allergen exposure and controlling airway inflammation
- •Understanding that both Th-cell mediated and neutrophilic inflammatory pathways drive the disease may guide future targeted treatment strategies beyond current standard therapies
- •Genetic testing for ECA13 and ECA15 regions may become useful for identifying at-risk horses, though current research gaps suggest more studies are needed before clinical implementation
Key Findings
- •Two chromosome regions (ECA13 and ECA15) identified as associated with severe equine asthma susceptibility in genetically predisposed horses
- •T helper cells (Th1, Th2, Th17) mediate the inflammatory response in severe equine asthma
- •Neutrophilic inflammation significantly contributes to persistence of airway inflammation in the disease
- •Severe equine asthma shows complexity and heterogeneity similar to human asthma, with inconsistent findings across studies