Mineralized Enzyme-Based Biomaterials with Superior Bioactivities for Bone Regeneration.

Area of Science:

• Biomaterials Science
• Biomineralization
• Tissue Engineering

Background:

• Bone formation relies on biomineralization, a process involving cells, biomolecules, and ions.
• Alkaline phosphatase (ALP) is a critical enzyme in bone metabolism and biomineralization.

Purpose of the Study:

• To develop a biomimetic strategy for creating mineralized alkaline phosphatase nanoparticles (MALPNs).
• To evaluate the efficacy of MALPNs in promoting bone regeneration and vascularization.

Main Methods:

• A biomimetic mineralization strategy was employed to synthesize MALPNs using ALP and calcium ions.
• In vitro studies assessed cell proliferation and osteogenic differentiation of bone marrow mesenchymal stem cells.
• MALPNs were incorporated into gelatin methacryloyl scaffolds for in vivo bone regeneration studies in rats.

Main Results:

• The biomimetic strategy successfully produced MALPNs while preserving ALP activity.
• MALPNs significantly enhanced mesenchymal stem cell proliferation and osteogenic differentiation in vitro.
• MALPN-incorporated scaffolds demonstrated excellent mechanical properties, sustained ALP release, and promoted bone regeneration and vascularization in vivo.

Conclusions:

• The biomimetic mineralization strategy is a versatile method for creating bioactive protein/enzyme-based materials.
• MALPNs show significant potential as advanced materials for bone tissue regeneration and engineering.
• This approach can be extended to mineralize other proteins, broadening applications in regenerative medicine.