A Multifunctional Therapeutic Platform: Ce/Zn/Sr-Doped Mesoporous Bioactive Glass Nanoparticles for Bone Repair

Area of Science:

• Biomaterials Science
• Nanotechnology
• Regenerative Medicine

Background:

• Bone tissue engineering faces challenges from surgical site infections and oxidative stress, hindering regeneration.
• Mesoporous bioactive glass nanoparticles (MBGNs) are a promising material for bone regeneration but require functionalization to address these challenges.

Purpose of the Study:

• To synthesize and characterize cerium (Ce), zinc (Zn), and strontium (Sr) co-doped MBGNs (xCe-yZn-Sr-MBGNs).
• To evaluate the in vitro antibacterial, antioxidant, osteogenic, and cytocompatibility effects of these doped MBGNs for bone tissue engineering applications.

Main Methods:

• MBGNs were synthesized using a microemulsion-assisted sol-gel route.
• Nanoparticle characterization included size, surface area, and ion release analysis.
• In vitro studies involved MC3T3-E1 pre-osteoblast cell culture, osteogenic differentiation assays, cell migration assays, radical scavenging assays, and antibacterial testing against S. aureus and P. aeruginosa.

Main Results:

• Spherical MBGNs (150-200 nm) with mesoporous structures and high surface areas (~340-425 m²/g) were successfully synthesized.
• Co-doped MBGNs showed dose-dependent cytocompatibility, with 1Ce-1Zn-Sr-MBGNs significantly enhancing osteogenic differentiation (2x gene expression, 45% increased calcium deposition) and cell migration (~70% scratch closure in 24h).
• 1Ce-1Zn-Sr-MBGNs demonstrated potent antibacterial activity against S. aureus and P. aeruginosa and strong radical scavenging capacity.

Conclusions:

• Optimized co-doping of MBGNs with Ce, Zn, and Sr yields multifunctional nanomaterials with antibacterial, antioxidant, and osteogenic properties.
• These 1Ce-1Zn-Sr-MBGNs effectively address critical challenges in bone healing: infection, oxidative stress, and promoting mineralized tissue formation.
• These multifunctional nanomaterials are highly promising for next-generation bone grafts and implant coatings, warranting further in vivo investigation.