Enzymatically biomineralized chitosan scaffolds for tissue-engineering applications

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Biomineralization

Background:

• Porous biodegradable scaffolds are crucial for tissue engineering, enabling cell seeding.
• Current methods often require osteogenic growth factors for effective biomineralization.
• Chitosan scaffolds offer potential but require optimization for enhanced mineralization.

Purpose of the Study:

• To develop an uncrosslinked chitosan scaffold for enzyme-mediated apatite formation.
• To induce biomineralization without relying on osteogenic growth factors.
• To evaluate the scaffold's efficacy in supporting cell activity.

Main Methods:

• Incorporation of alkaline phosphatase (ALP) into uncrosslinked chitosan scaffolds.
• Physicochemical analysis to characterize mineral formation and phase structure.
• Assessment of MC3T3 cell behavior on the mineralized scaffolds.

Main Results:

• Homogeneous mineralization was observed within the chitosan scaffolds.
• Mineral phase structure resembled apatite at low ALP concentrations and dicalcium phosphate dihydrate (DCPD) at higher concentrations.
• Mineralized scaffolds significantly improved MC3T3 cell adhesion, proliferation, and colonization.

Conclusions:

• Uncrosslinked chitosan scaffolds incorporating ALP effectively induce biomineralization.
• The scaffold promotes cell activity, indicating suitability for tissue engineering.
• This approach offers a growth factor-free strategy for creating bone-like mineralized tissues.