Evaluation of contractile phenotype in airway smooth muscle cells isolated from endobronchial biopsy and tissue specimens from horses.

This research explores a developed method for maintaining the original phenotype of airway smooth muscle (ASM) cells taken from horse lung biopsies in long-term cell cultures. This finding has potential applications for tissue engineering and further laboratory studies on equine ASM cells.

Methodology

• The researchers created a sampling protocol aimed at preserving the contractile phenotype of ASM cells. These cells were collected from different sources: freshly harvested lungs of horses that were previously healthy, and lung biopsies from both healthy horses and horses affected by heaves, a chronic respiratory condition.
• A total of 12 horses were used to provide endobronchial tissue specimens, while lung biopsy specimens were collected from an additional 9 horses.
• Immunologic techniques were used to assess the contractile phenotype of the cultured ASM cells.

Results

• The researchers successfully cultured characteristic ASM cells from lung tissue or biopsy specimens from both healthy and heaves-affected horses.
• Notably, these cells retained their contractile phenotype for up to 7 passages, which suggests that the cells maintained their original functionality through multiple generations in the cell culture.
• Furthermore, by the seventh passage, the cells still demonstrated the ability to contract in response to methacholine within a collagen gel, illustrating that they preserved one of their key properties in vivo.

Conclusions and Clinical Relevance

• ASM cells, when isolated from horse lung tissue and biopsy specimens, were observed to maintain their contractile phenotype in long-term cell cultures. This discovery is an important advancement as it suggests that these cells could be useful in tissue engineering projects.
• In addition, the ability to maintain this phenotype over time could make these cells valuable for in vitro (lab-based) studies of equine ASM cells, which could, in turn, progress our understanding of lung diseases in horses.