Assessing the functional properties of tenogenic primed mesenchymal stem cells in ex vivo equine tendon and ligament explants: A preliminary study.

The researchers are investigating the use of specific types of stem cells, known as tenogenic primed mesenchymal stem cells, to treat injuries to horse tendons and ligaments. The study specifically explores the adherence of these cells to tendon and ligament tissue, and their effects on protein expression.

Methodology

The research used both native mesenchymal stem cells (MSCs) and tenogenic primed mesenchymal stem cells (tpMSCs). The experiment was divided into two distinct parts.

• The first part focused on preparing cytospins from the MSCs and tpMSCs, thus allowing the researchers to assess the expression of collagen type I (COL I) and smooth muscle actin (SMA), two proteins vital to tendon and ligament health and function.
• In the second part of the experiment, tendon and ligament tissues from equine superficial digital flexor tendon and suspensory ligament were cultured in the lab. These tissues were then treated with both MSCs and tpMSCs, allowing the researchers to observe their effects.

Results

The results presented several notable findings:

• First, in the cultured cells (cytospins), tpMSCs showed a significantly higher expression of collagen type I protein and a lower expression of smooth muscle actin compared to native MSCs. This is significant as COL I is crucial for tendon and ligament health, while a higher presence of SMA might indicate adverse fibrotic changes.
• Second, in the lab-cultured tendon and ligament tissues, the tpMSCs showed higher adherence compared to the native MSCs. This adherence is crucial for the MSCs to anchor themselves to the injury site and provide their beneficial effects.
• Third, lesions treated with tpMSCs showed a significantly higher percentage of COL I positive cells and a lower percentage of SMA positive cells. This again suggests that tpMSCs promote a healthier tendon/ligament environment compared to the native MSCs.

Implications

These results point to tpMSCs offering significant potential for treating tendon and ligament injuries in horses. By promoting the expression of beneficial proteins and adhering more effectively to the site of injury, they may be better equipped than current treatment alternatives to restore functionality and prolong the athletic lives of horses. However, as the study used ex vivo tissue cultures, further in vivo studies are essential to confirm and fully understand these findings.