Nano-Silicate-Reinforced and SDF-1α-Loaded Gelatin-Methacryloyl Hydrogel for Bone Tissue Engineering

Area of Science:

• Biomaterials Science
• Regenerative Medicine
• Tissue Engineering

Background:

• Autologous bone grafts are limited by supply and donor site morbidity.
• Injectable osteogenic hydrogels offer minimally invasive solutions for bone defects.
• Current methods for fabricating injectable osteogenic hydrogels are often complex and inconvenient.

Purpose of the Study:

• To develop a simple and convenient strategy for fabricating an injectable osteogenic hydrogel.
• To create a bone graft material that overcomes the limitations of autologous bone grafts.
• To enhance bone regeneration using an injectable hydrogel system.

Main Methods:

• Synthesized gelatin-methacryloyl (GelMA) pre-polymer.
• Incorporated nano silicate (SN) and stromal cell-derived factor-1 alpha (SDF-1α) into the GelMA pre-polymer.
• Evaluated hydrogel injectability, controlled release, stem cell homing, osteogenic potential, and in vivo bone regeneration in a rat calvaria defect model.

Main Results:

• The GelMA-SN-SDF-1α hydrogel demonstrated excellent injectability and controlled release of SDF-1α.
• The hydrogel promoted mesenchymal stem cell (MSC) migration, homing, proliferation, and osteogenic differentiation.
• Significant bone regeneration was observed in critical-sized calvaria defects in rats treated with the hydrogel.

Conclusions:

• The developed GelMA-SN-SDF-1α hydrogel offers a simple and convenient method for creating injectable osteogenic bone graft materials.
• This hydrogel shows promising potential for treating bone defects with enhanced bone regeneration.
• The strategy provides a viable alternative to traditional autologous bone grafting.