Modulatory role of regulatory T cells in a murine model of severe equine asthma.
Authors: Henríquez Claudio, Morán Gabriel, Carrasco Cristian, Sarmiento José, Barría Miguel, Folch Hugo, Uberti Benjamin
Journal: BMC veterinary research
Summary
# Editorial Summary: Regulatory T Cells in Equine Asthma Severe equine asthma involves complex immune dysregulation, yet the precise role of regulatory T cells (Treg) in disease pathogenesis remains poorly understood. Using a murine model, researchers exposed animals to allergen challenge whilst manipulating Treg populations through cyclophosphamide (Cy) depletion, then assessed airway inflammation markers and structural lung changes via bronchoalveolar lavage fluid analysis and histopathology. Allergen exposure naturally increased Treg percentages; critically, animals with depleted Treg populations developed exacerbated airway inflammation characterised by elevated neutrophil infiltration and raised specific immunoglobulins in BALF, alongside significantly greater structural remodelling including epithelial hyperplasia, goblet cell proliferation, and airway smooth muscle hypertrophy. These findings indicate that Treg cells actively suppress inflammatory responses in asthmatic airways, suggesting that immunomodulatory therapies enhancing Treg function may warrant investigation as disease-modifying treatments for horses with severe asthma rather than relying solely on anti-inflammatory corticosteroids. The work provides mechanistic rationale for exploring novel immunotherapeutic approaches, particularly in cases refractory to conventional management.
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Practical Takeaways
- •This foundational research identifies regulatory T cells as protective modulators in asthmatic airway disease, which may eventually inform therapeutic targets for managing severe equine asthma
- •The murine model demonstrates that depleting protective immune mechanisms worsens airway inflammation and structural remodeling, suggesting future therapies should focus on enhancing rather than suppressing certain immune pathways
- •Understanding the immunologic basis of equine asthma through this model may lead to improved diagnostic and preventive strategies, but clinical application remains experimental
Key Findings
- •Regulatory T cells (Treg) percentage increased with allergen exposure in the murine model, mirroring findings in horses with asthma
- •Treg cell depletion via cyclophosphamide treatment increased neutrophil infiltration and specific immunoglobulin levels in bronchoalveolar lavage fluid
- •Cyclophosphamide pretreatment before allergen challenge resulted in increased lung cellular infiltration and bronchial remodeling including epithelial hyperplasia, goblet cell hyperplasia, and airway smooth muscle hypertrophy