Modular hydrogel niche orchestrates microenvironment detoxification and stem cell redirecting toward precision...

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Tissue Engineering

Background:

• Osteoarthritis (OA) is a degenerative joint disease with limited therapeutic options.
• Mesenchymal stem cells (MSCs) show promise for OA but face challenges like poor survival and microenvironment hostility.
• Current treatments fail to adequately address chronic inflammation and cartilage degradation in OA.

Purpose of the Study:

• To develop a bioengineered hydrogel niche (PPT hydrogel) for sustained osteoarthritis treatment.
• To enhance bone marrow MSCs (BMSCs) survival and function within the OA joint.
• To promote stable hyaline cartilage regeneration and restore joint homeostasis.

Main Methods:

• Fabrication of a modular amphiphilic PPT hydrogel.
• Integration of antioxidative, anti-inflammatory, and pro-differentiation properties.
• Assessment of BMSCs survival, differentiation, and paracrine signaling within the hydrogel.
• Evaluation of chondrocyte response and joint tissue regeneration in an OA model.

Main Results:

• PPT hydrogel enhanced BMSCs survival via Hedgehog signaling activation.
• The hydrogel promoted stable hyaline cartilage regeneration, suppressing fibrosis and hypertrophy.
• BMSCs within the PPT hydrogel restored chondrocyte redox homeostasis and autophagy via FOXO1.
• A self-reinforcing therapeutic loop was established, improving joint tissue repair.

Conclusions:

• The PPT hydrogel platform effectively reprograms the joint microenvironment for sustained OA therapy.
• This bioengineered niche overcomes limitations of conventional MSC delivery for regenerative medicine.
• The PPT hydrogel offers a versatile platform for treating complex inflammatory and degenerative diseases beyond OA.