Hydrogel-filled polylactide porous scaffolds for cartilage tissue engineering

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Regenerative Medicine

Background:

• Polymer porous scaffolds and hydrogels are used as extracellular matrix (ECM) analogues but have limitations.
• Combining these materials could leverage their respective advantages for improved tissue regeneration.

Purpose of the Study:

• To develop a composite scaffold combining poly-L-lactide (PLLA) porous scaffolds and agar hydrogel.
• To evaluate the construct's ability to support chondrocyte growth, differentiation, and cartilage formation in vitro and in vivo.

Main Methods:

• PLLA scaffolds were fabricated using thermally induced phase separation and filled with agar hydrogel containing chondrocytes.
• Cell morphology, viability (MTT assay), and extracellular matrix (collagen, GAG) secretion were assessed.
• In vivo studies involved subcutaneous implantation in nude mice, followed by histological examination.

Main Results:

• The chondrocyte-laden hydrogel-PLLA scaffold promoted chondrogenesis and maintained cell viability.
• Addition of gelatin further enhanced glycosaminoglycan (GAG) secretion and cytoviability.
• In vivo implantation resulted in regenerated cartilage with high collagen and GAG content, maintaining the scaffold's shape.

Conclusions:

• The composite scaffold provides mechanical support and an ECM-like environment, enhancing cartilage regeneration.
• This approach offers a promising strategy for scaffold preparation and cell transplantation in tissue engineering.
• The developed material simultaneously achieves suitable mechanical properties and excellent cell performance.