Recellularization of Bronchial Extracellular Matrix With Primary Bronchial Smooth Muscle Cells.
Authors: Ben Hamouda Selma, Vargas Amandine, Boivin Roxane, Miglino Maria Angelica, da Palma Renata Kelly, Lavoie Jean-Pierre
Journal: Journal of equine veterinary science
Summary
# Editorial Summary Airway smooth muscle (ASM) hypertrophy and extracellular matrix (ECM) remodelling are hallmarks of severe equine asthma, yet the cellular mechanisms driving these changes remain poorly understood—particularly regarding how the ECM itself influences muscle cell behaviour and why therapeutic reversibility is limited. Researchers from Quebec developed a novel in vitro model by decellularising equine bronchi using Triton/Sodium Deoxycholate treatment, then reseeding the resulting scaffolds with primary ASM cells; the decellularisation protocol successfully preserved anatomical structure and matrixial protein composition whilst removing approximately 95% of cellular DNA (with remaining fragments <100 bp). When primary ASM cells were introduced to these scaffolds, they demonstrated preferential migration and proliferation specifically within the smooth muscle matrix layer rather than distributing randomly, indicating a chemotactic response to the preserved ECM architecture. This three-dimensional culture model now provides equine practitioners and researchers with a physiologically relevant platform to investigate how asthmatic ECM composition directly modulates ASM behaviour and to identify specific molecular targets responsible for pathological bronchial remodelling—work that could ultimately inform therapeutic strategies beyond current symptom management approaches.
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Practical Takeaways
- •This recellularization protocol provides a novel research tool to investigate molecular mechanisms driving asthmatic airway remodeling in horses, potentially leading to improved therapeutic targets beyond current limited treatment options
- •The demonstration that ASM cells preferentially repopulate the smooth muscle matrix layer validates the use of equine bronchial scaffolds as a physiologically relevant model for studying ECM-cell interactions in equine asthma
Key Findings
- •Bronchial matrices were successfully decellularized using Triton/Sodium Deoxycholate while retaining anatomical and histological properties with remaining DNA of 29.6 ng/mg tissue ± 5.6
- •Primary airway smooth muscle cells preferentially migrated and proliferated in the decellularized smooth muscle matrix layer, suggesting chemotactic scaffold properties
- •Matrixial protein composition remained unchanged between native bronchi and decellularized scaffolds as confirmed by immunohistochemistry