Novel phase separated polycaprolactone/collagen scaffolds for cartilage tissue engineering.

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Regenerative Medicine

Background:

• Osteoarthritis is a major cause of global pain and disability, with limited long-term treatments for cartilage defects.
• Current cartilage tissue engineering approaches face challenges with scaffold material distribution and penetration.
• Collagen type I coating on scaffolds has shown poor distribution and penetration in previous studies.

Purpose of the Study:

• To fabricate porous hybrid polycaprolactone (PCL)/collagen type I scaffolds using thermally induced phase separation.
• To achieve an equal distribution of collagen type I throughout the PCL scaffold structure.
• To evaluate the impact of collagen concentration on scaffold porosity, mechanical properties, and chondrocyte viability.

Main Methods:

• Fabrication of PCL/collagen type I scaffolds using polycaprolactone, varying collagen type I concentrations, and acetic acid as a solvent.
• Characterization of scaffold structure, porosity, and collagen distribution using antibody staining.
• Assessment of scaffold compressive properties and chondrocyte attachment, proliferation, and viability over 14 days.

Main Results:

• Scaffolds exhibited an interconnected and porous structure, with porosity influenced by collagen concentration.
• Collagen type I antibody staining confirmed an equal distribution of collagen within the PCL fibers.
• Scaffolds with 0.2% wt/vol collagen displayed compressive properties comparable to native cartilage.
• PCL/collagen scaffolds supported chondrocyte attachment and showed greater cell viability compared to PCL-only scaffolds.

Conclusions:

• Thermally induced phase separation enables the fabrication of PCL/collagen type I scaffolds with tunable porosity and mechanical properties.
• The developed scaffolds demonstrate uniform collagen distribution and favorable mechanical characteristics for cartilage regeneration.
• Further research is needed to assess the long-term efficacy of these scaffolds in treating cartilage defects.