Differences between the cell populations from the peritenon and the tendon core with regard to their potential implication in tendon repair.
Authors: Cadby Jennifer A, Buehler Evelyne, Godbout Charles, van Weeren P René, Snedeker Jess G
Journal: PloS one
Summary
# Editorial Summary: Peritenon versus Tendon Core Cells in Equine Healing Potential The relative contributions of extrinsic healing (from the peritenon sheath) and intrinsic healing (from within the tendon proper) remain incompletely understood in equine tendon injury, despite their clinical significance. Cadby and colleagues extracted and cultured cell populations from both the peritenon and core of equine superficial digital flexor tendons, then compared their plasticity, proliferative capacity, migration rates, and differentiation potential using colony-forming assays, multipotency testing, and gene expression analysis. Peritenon-derived cells demonstrated substantially superior healing characteristics: they migrated faster, replicated more rapidly, expressed higher levels of progenitor cell markers, and showed greater capacity to differentiate towards a myofibroblastic phenotype compared to core tendon cells—though notably, both populations retained the ability to differentiate into unwanted tissue types (bone and fat). These findings suggest that peritenon cells, long considered "extrinsic" contributors, play a far more active and potentially dominant role in tendon healing outcomes than previously appreciated. For practitioners managing equine tendon injuries, this work provides biological rationale for understanding why peritenon integrity and mobilisation strategies may be underestimated factors in rehabilitation, and highlights the importance of managing the broader peritendinous environment alongside the injured tendon itself.
Read the full abstract on PubMed
Practical Takeaways
- •Peritenon tissue appears to play a critical role in tendon repair through cell populations with superior healing potential; managing peritenon health during rehabilitation may be as important as protecting the tendon core itself
- •The capacity of peritenon cells to differentiate into multiple cell types (including myofibroblasts) suggests that inflammation and fibrosis in tendon healing may be partially driven by extrinsic healing; controlled early mobilization and inflammation management warrant careful consideration
- •Understanding that both intrinsic and extrinsic healing pathways are active and capable of different outcomes supports multi-faceted rehabilitation approaches rather than immobilization-only protocols
Key Findings
- •Peritenon-derived cells migrated faster and replicated more quickly than tendon core cells
- •Both peritenon and tendon core cells demonstrated capacity for adipogenic and osteogenic differentiation, with peritenon cells showing higher progenitor cell marker expression
- •Peritenon cells showed higher differentiation potential toward myofibroblastic phenotype compared to tendon core cells
- •Results suggest peritenon cells have substantial influence on tendon healing outcomes through extrinsic healing mechanisms