Injectable chitosan hyaluronic acid hydrogels for cartilage tissue engineering

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Regenerative Medicine

Background:

• Injectable hydrogels offer advantages for tissue engineering by forming gels in situ.
• Cartilage repair remains a significant challenge due to the limited self-healing capacity of articular cartilage.

Purpose of the Study:

• To develop and characterize an injectable composite hydrogel for cartilage tissue engineering.
• To evaluate the cytocompatibility and chondrogenic potential of the hydrogel system.

Main Methods:

• Fabrication of methacrylated glycol chitosan (MeGC) and hyaluronic acid (HA) composite hydrogels via photocrosslinking.
• Assessment of hydrogel mechanical properties (compressive modulus) and encapsulated chondrocyte viability under varying irradiation times.
• Evaluation of chondrocyte morphology, viability, proliferation, and extracellular matrix deposition over a 21-day culture period.

Main Results:

• Stable hydrogels were formed with a minimum irradiation time of 40s, maintaining high chondrocyte viability (87-90%).
• Increased irradiation time enhanced hydrogel stiffness but reduced cell viability.
• MeGC/HA hydrogels with 300s irradiation supported chondrocyte viability (~80-87%) and morphology.
• Hyaluronic acid incorporation in MeGC hydrogels significantly increased chondrocyte proliferation and cartilaginous extracellular matrix deposition.

Conclusions:

• Methacrylated glycol chitosan/hyaluronic acid composite hydrogels are suitable for injectable cell delivery in cartilage tissue engineering.
• Optimized photocrosslinking conditions balance hydrogel stability and cell viability.
• The MeGC/HA hydrogel system demonstrates significant potential for promoting cartilage repair through enhanced chondrocyte function.