Bioactive Chitin-Based Thermosensitive Hydrogel Reinforces Stem Cell Therapy for Osteoarthritis

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Orthopedics

Background:

• Osteoarthritis (OA) is a degenerative joint disease with limited effective treatments.
• Current therapies for OA provide temporary relief and have adverse effects.
• Mesenchymal stem cell (MSC) therapy shows potential for OA but faces challenges with cell survival and retention.

Purpose of the Study:

• To develop an injectable, bioactive, thermosensitive hydroxypropyl chitin (HPCT) hydrogel.
• To evaluate the efficacy of HPCT hydrogel in enhancing MSC-based therapy for OA.
• To investigate the underlying mechanisms of HPCT hydrogel-mediated therapeutic effects.

Main Methods:

• Development of a bioactive, thermosensitive HPCT hydrogel.
• Intra-articular injection of MSCs combined with HPCT hydrogel in early and late-stage OA models.
• Assessment of therapeutic efficacy, chondrocyte ferroptosis, MSC viability, and retention.
• Analysis of mechanotransduction pathways, including Piezo1 and GPX4.

Main Results:

• HPCT hydrogel significantly enhanced MSC therapeutic efficacy in OA models.
• The hydrogel attenuated ferroptosis in chondrocytes by creating a protective microenvironment.
• MSCs within the hydrogel showed improved viability, anti-inflammatory properties, and prolonged retention.
• Cartilage repair, regeneration, and joint homeostasis were promoted, with modulated mechanotransduction pathways.

Conclusions:

• HPCT hydrogel is a promising injectable platform for enhancing MSC therapy in OA.
• This approach improves MSC function and retention, leading to significant cartilage repair.
• HPCT-based tissue engineering offers a viable strategy for improving long-term OA outcomes.