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Dual-Targeted Nanoplatform Regulating the Bone Immune Microenvironment Enhances Fracture Healing
Wu Zhou1,2, Ze Lin1,2, Yuan Xiong1,2
1Department of Orthopaedics, Union Hospital, Tongji Medical College, Huazhong University of Science and Technology, Wuhan 430022, China.
ACS Applied Materials & Interfaces
|November 19, 2021
Summary
This study developed targeted nanoparticles delivering baicalein (BCL) to fracture sites. The nanoparticles promote M2 macrophage polarization, enhancing bone healing and osteogenic differentiation with improved safety.
Area of Science:
- Biomaterials Science
- Immunology
- Orthopedics
Background:
- The immune and skeletal systems are interconnected, with macrophages crucial for bone remodeling.
- Baicalein (BCL) promotes M2 macrophage polarization, aiding bone healing, but faces delivery and toxicity challenges.
- Targeted delivery systems are needed to overcome BCL's limitations in fracture treatment.
Purpose of the Study:
- To develop a targeted nanoparticle system for delivering baicalein (BCL) to fracture sites.
- To enhance macrophage recruitment and M2 polarization for improved bone regeneration.
- To investigate the therapeutic potential of BCL-loaded nanoparticles in promoting osteogenic differentiation.
Main Methods:
- Fabrication of mesoporous silica and Fe3O4 composite nanoparticles (MMSNPs) loaded with BCL.
- Surface modification with sulfhydrylation, amination, and NW-targeting peptide for macrophage targeting.
- Use of β-cyclodextrin as a gatekeeper, released by glutathione (GSH) for controlled BCL release.
- Magnetic delivery of nanoparticles to fracture sites and assessment of M2 polarization and osteogenic differentiation.
Main Results:
- The developed BCL@MMSNPs-SS-CD-NW nanoparticles were successfully synthesized and targeted to macrophages.
- Targeted delivery and controlled release of BCL induced M2 macrophage polarization at the fracture site.
- The treatment promoted mesenchymal stem cell (MSC) osteogenic differentiation and enhanced bone healing.
- The nanosystem demonstrated high biosafety and reduced off-target toxicity.
Conclusions:
- Targeted nanoparticles effectively deliver baicalein (BCL) to fracture sites, modulating macrophage phenotype for bone repair.
- This strategy overcomes BCL's delivery limitations, offering a promising therapeutic approach for bone fractures.
- The developed nanosystem shows significant potential for promoting osteogenic differentiation and bone regeneration with excellent safety.
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