Changes on the Structural Architecture and Growth Factor Release, and Degradation in Equine Platelet-Rich Fibrin Clots Cultured Over Time.
Authors: Jiménez-Aristazábal Román F, Carmona Jorge U, Prades Marta
Journal: Journal of equine veterinary science
Summary
# Editorial Summary Platelet-rich fibrin (PRF) has gained traction as a regenerative therapy in equine practice, yet limited data exist on how clots evolve structurally and what growth factors they release over clinically relevant timeframes. Jiménez-Aristizabal Román and colleagues used microscopy (light, transmission electron, and scanning electron) alongside enzyme-linked immunosorbent assay (ELISA) to track the architectural changes and growth factor kinetics of equine PRF clots cultured for 14 days, sampling at 48-hour intervals. The clots demonstrated a progressive maturation pattern: at one hour, cells were loosely trapped in nascent fibrin; by day 8, they were more densely embedded; and by day 14, organised fibrin fibrils completely surrounded platelets and leukocytes, with ultrastructural evidence of platelet degradation occurring by the final timepoint. Both transforming growth factor beta 1 (TGF-β1) and insulin-like growth factor type I (IGF-I) concentrations increased consistently throughout the 14-day culture period, with TGF-β1 released in a gradual, controlled manner consistent with ongoing platelet breakdown, whilst IGF-I production remained sustained. These findings suggest PRF clots provide a prolonged and predictable release profile of key pro-regenerative cytokines—particularly relevant for practitioners choosing between injection of fresh clot versus allowing pre-incubation before clinical application, and indicating that the therapeutic window extends at least two weeks post-preparation.
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Practical Takeaways
- •PRF clots maintain controlled growth factor release over 2 weeks, supporting their use as biologics for tissue healing in equine practice
- •The sustained and gradual release of TGF-β1 and IGF-I suggests PRF may provide prolonged therapeutic benefit compared to other biological products with rapid factor depletion
- •PRF structural organization and growth factor kinetics support timing of application and re-treatment protocols in clinical equine rehabilitation cases
Key Findings
- •PRF clots develop organized fibrin architecture over 14 days with progressive cell embedding and fibrin network maturation
- •TGF-β1 release increases gradually and continuously over 14 days, correlating with platelet disintegration observed at day 14
- •IGF-I production and release from PRF clots is sustained over the 14-day culture period
- •Transmission electron microscopy revealed preserved platelet ultrastructure at day 8 with organelle damage and peripheralization evident by day 14