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3D Printed Multifunctional Biomimetic Bone Scaffold Combined with TP-Mg Nanoparticles for the Infectious Bone Defects
Xulin Hu1,2, Jiao Chen3, Shuhao Yang4
1Clinical Medical College and Affiliated Hospital of Chengdu University, Chengdu University, Chengdu, Sichuan, 610081, China.
Small (Weinheim an Der Bergstrasse, Germany)
|May 28, 2024
Summary
This study developed a novel ceramic scaffold for infected bone defects. The multifunctional scaffold (α/β-TCP@TP-Mg) demonstrates antibacterial, anti-inflammatory, and bone-enhancing properties for improved healing.
Area of Science:
- Biomaterials Science
- Orthopedic Surgery
- Nanotechnology
Background:
- Infected bone defects pose significant treatment challenges due to high antibiotic failure rates and limited bone graft options.
- Current treatments often struggle to address the complex microenvironment of infected bone defects effectively.
Purpose of the Study:
- To develop a multifunctional ceramic scaffold for treating infected bone defects.
- To create a bionic cancellous bone substitute integrating antibacterial, anti-inflammatory, and osteoinductive properties.
Main Methods:
- Low-temperature 3D printing was used to fabricate α/β-tricalcium phosphate (α/β-TCP) scaffolds incorporating gelatin.
- Tea polyphenol-magnesium (TP-Mg) nanoparticles were loaded into the scaffolds to create the α/β-TCP@TP-Mg composite.
- The mechanical strength, antibacterial activity against Staphylococcus aureus, macrophage polarization, and osteogenic potential of the scaffolds were evaluated.
Main Results:
- The α/β-TCP@TP-Mg scaffolds exhibited high mechanical strength (>100 MPa) and mimicked cancellous bone structure.
- The scaffolds demonstrated significant inhibition of Staphylococcus aureus (S. aureus) growth.
- TP-Mg loading promoted the M1 to M2 macrophage phenotype transition and enhanced bone regeneration via synergistic Mg2+ and Ca2+ effects.
Conclusions:
- A multifunctional ceramic scaffold (α/β-TCP@TP-TCP) was successfully constructed, integrating anti-inflammatory, antibacterial, and osteoinductive capabilities.
- This composite scaffold shows promise for treating infected bone defects by modulating the early microenvironment and promoting late bone healing.
- The developed scaffold offers a promising therapeutic strategy for infected bone defects, addressing limitations of current treatments.
