3D-Printed PEG-PLA/Gelatin Hydrogel: Characterization toward In Vitro Chondrocyte Redifferentiation

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Regenerative Medicine

Background:

• 3D printing offers advanced solutions for tissue engineering and regenerative medicine.
• Effective 3D-printed hydrogels for cartilage regeneration are limited due to printability and chondrocyte redifferentiation challenges.

Purpose of the Study:

• To develop and characterize 3D-printed PEG-PLA/gelatin hydrogel scaffolds for cartilage regeneration.
• To investigate the impact of hydrogel composition on mechanical properties, swelling, degradation, and chondrocyte behavior.

Main Methods:

• PEG-PLA copolymer was combined with gelatin to create printable hydrogels.
• Hydrogel properties (mechanical, swelling, degradation) were analyzed based on PLA chain length, gelatin content, and cross-linker concentration.
• Porcine articular chondrocytes were seeded to evaluate cell adhesion, proliferation, and redifferentiation on the hydrogels.

Main Results:

• Increased gelatin content or decreased cross-linker/PLA chain length led to higher swelling, reduced mechanical strength, and faster degradation.
• Hydrogels with higher swelling ability enhanced initial cell adhesion and chondrocyte proliferation.
• Increased gelatin content improved chondrogenic redifferentiation and glycosaminoglycan secretion.
• Immunofluorescence confirmed type II collagen accumulation, indicating cartilaginous matrix formation.

Conclusions:

• PEG-PLA/gelatin hydrogels with optimized gelatin content provide a suitable environment for articular chondrocyte growth and redifferentiation.
• These 3D-printed hydrogels show significant potential for cartilage tissue engineering and cartilage defect treatment.