Smart Device for Biologically Enhanced Functional Regeneration of Osteo-Tendon Interface.

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Regenerative Medicine

Background:

• Tendon lacerations heal with scar tissue, leading to reduced functionality.
• Chronic tendon injuries often necessitate surgical intervention.
• Tissue engineering scaffolds aim to improve surgical outcomes and enhance healing.

Purpose of the Study:

• To design an electrospun hybrid tubular scaffold mimicking native tendon structure and extracellular matrix (ECM).
• To incorporate human platelet lysate (PL) for enhanced functional regeneration of the osteo-tendon interface.
• To investigate the synergistic effects of hydroxyapatite nanoparticles (HP) and PL in scaffold performance.

Main Methods:

• Fabrication of pullulan/chitosan based tubular scaffolds enriched with hydroxyapatite nanoparticles (HP).
• Vertical electrospinning to align nanofibers, mimicking tendon fascicle direction.
• Loading scaffolds with human platelet lysate (PL) and evaluating protein diffusion.
• In vitro studies using tenocytes and osteoblasts to assess cell adhesion, proliferation, and ECM production.

Main Results:

• Scaffolds exhibited tendon-like mechanical properties, influenced by HP content and tube size.
• PL proteins successfully permeated the scaffold wall.
• Tenocytes and osteoblasts adhered, proliferated, and produced key ECM components (collagen, sialoproteins) on the scaffold in the presence of PL.
• HP and PL demonstrated a synergistic effect on new tissue formation.

Conclusions:

• PL-loaded, HP-doped aligned tubular scaffolds represent a promising strategy for tendon-to-bone interface regeneration.
• The scaffold design effectively supports cell activity and ECM production crucial for functional tissue repair.
• This approach holds potential for improving outcomes in treating tendon injuries.