Raloxifene microsphere-embedded collagen/chitosan/β-tricalcium phosphate scaffold for effective bone tissue...

Area of Science:

• Biomaterials Science
• Tissue Engineering
• Regenerative Medicine

Background:

• Developing functional scaffolds mimicking the extracellular matrix (ECM) is crucial for bone tissue engineering.
• Collagen/chitosan/β-tricalcium phosphate (CCTP) composites offer potential but require enhancement for improved regeneration.

Purpose of the Study:

• To fabricate and evaluate a novel CCTP-based scaffold embedded with raloxifene (RLX)-loaded PLGA microspheres (MS) for enhanced bone regeneration.
• To assess the scaffold's physical characteristics, drug release profile, and biological efficacy in promoting bone cell activity.

Main Methods:

• Fabrication of CCTP scaffolds incorporating RLX-loaded PLGA microspheres.
• Characterization of scaffold pore size (150-200μm), mechanical strength, and swelling/degradation properties.
• In vitro assessment of RLX release kinetics, cell proliferation (MC3T3-E1), Alizarin red staining (mineralization), and alkaline phosphatase (ALP) activity.

Main Results:

• The RLX-MS embedded CCTP scaffold exhibited ideal pore size, mechanical strength, and controlled RLX release.
• Significantly enhanced MC3T3-E1 cell proliferation was observed in the RLX-MS group.
• Higher Alizarin red staining and ALP activity indicated increased mineralization and bone regeneration capacity.

Conclusions:

• The novel RLX-MS embedded CCTP scaffold demonstrates excellent biocompatibility and osteogenic potential.
• This biomaterial shows significant promise for applications in bone tissue engineering and regeneration.
• The controlled release of RLX from the microspheres within the scaffold enhances cellular activity crucial for bone repair.