Tenogenic potential of tendon-derived mesenchymal stem cells isolated post-mortem: Impact of cryopreservation.

This research study explores the potential use of tendon-derived mesenchymal stem cells (TDSCs) in treating tendinopathies (tendon injuries), and asserts that even after cryopreservation (freezing), these cells retain their ability to produce crucial types of collagen necessary for tendon repair.

Objective of the Study

• The main aim of this research was to investigate the ‘tenogenic’ potential (i.e., the capacity to form tendon tissue) of TDSCs post-cryopreservation, by evaluating their ability to produce type I and III collagen fibers. These particular types of collagen are integral to the construction and repair of tendon tissue.

Methodology of the Study

• TDSCs were harvested from the tendon within 72 hours post-mortem and their ‘stemness’ phenotype, essentially their stem-cell qualities, were analyzed with flow cytometry, a technology used to measure the physical and chemical characteristics of cells.
• The tenogenic potential of these cells was assessed through a technique called quantitative reverse transcriptase polymerase chain reaction (qRT-PCR). This method helped to analyze gene expression connected to tenogenic differentiation, or the process by which the TDSCs could develop into tendon tissue.
• To understand the ability of TDSCs to synthesize type I and III collagen fibers, they were cultured with Transforming Growth Factor-β1(TGF-β1), which is known to stimulate such processes.

Results and Findings of the Study

• All samples/conditions analyzed were positive for specific markers (CD105, CD90, CD29, CD44) and negative for MHC-II, aligning with the expected phenotype of mesenchymal stem cells as per the International Society for Cellular Therapy (ISCT).
• The analyses confirmed the tenogenic potential of TDSCs through qRT-PCR, indicating that these cells can indeed evolve into tendon tissue.
• Furthermore, under the influence of TGF-β1, TDSCs demonstrated the crucial ability to synthesize collagen fibers.
• The study affirmed that TDSCs, whether freshly harvested or cryopreserved, actively contribute to the tenogenic pathway. This means they could be effectively mobilized towards tendon repair when required.

Implications and Conclusion

• The study concludes that TDSCs possess qualities making them suitable for banking and subsequent clinical use for tendon repair. As cryopreservation does not affect their fundamental capabilities, these cells can be stored, increasing the feasibility and accessibility of this potentially effective treatment.