Changes on the Structural Architecture and Growth Factor Release, and Degradation in Equine Platelet-Rich Fibrin Clots Cultured Over Time.

The study evaluates the microscopic structure of equine platelet-rich fibrin clots, and the release and degradation of transforming growth factor beta 1 and insulin-like growth factor type, within a period of 14 days.

Research Methodology

• The study was carried out using blood drawn from six different horses. The collected blood was placed in plain tubes and centrifuged at 240 g for 8 minutes to create the PRF clots.
• The researchers used microscopy techniques (histology, transmission electron microscopy and scanning electronic microscopy) to evaluate clot structure at various points in time.
• The concentration of transforming growth factor-beta 1 (TGF-β) and insulin-like growth factor type 1 (IGF-I), which are important substances released by the platelets, were measured over two-week period. The concentrations were measured every 48 hours using a technique called ELISA (enzyme-linked immunosorbent assay).
• The collected data was analyzed using one-way repeated-measures ANOVA.

Research Findings

• The structural study of the clots showed a fibrin layer and a cellular layer with platelets and leukocytes (a type of white blood cell).
• Scanning electron microscopy revealed that the cells were trapped by a budding fibrin network at first, but by day 8, these cells were wrapped in the fibrin network.
• By day 14, it was found that the leukocytes and platelet aggregates were absorbed into a structured web of fibrin threads.
• Transmission electron microscopy displayed platelets with undamaged cytoplasm and alpha granules scattered randomly by day 8. However, by day 14, the platelets showed signs of disintegration, characterized by a broken cytoplasm and organelle migration to the periphery.
• In terms of the release and degradation of TGF-β and IGF-I, a progressive increase in concentrations was observed until day 14. Specifically, TGF-β was gradually and methodically released from PRF clots, with concentrations escalating over a period of two weeks. This observation correlated with TEM findings, which revealed that platelet disintegration began around day 14.
• IGF-I production and release were reported to be constant over the duration of the study.

Conclusion

The study provides insights into the architecture and dynamic changes in equine PRF clots over time. The gradual structural reorganization of the clots and evolving growth factor release patterns could be crucial in understanding potential applications of PRF clots in equine regenerative medicine.