Collaborative Design of MgO/FeO_x Nanosheets on Titanium: Combining Therapy with Regeneration

Area of Science:

• Biomaterials Science
• Nanotechnology
• Orthopedic Oncology

Background:

• Osteosarcoma resection often leads to tumor recurrence and bacterial infections, complicating bone defect repair.
• Current treatments face challenges in simultaneously addressing tumor eradication, infection control, and bone regeneration.
• Developing multifunctional bone implants is crucial for effective osteosarcoma treatment.

Purpose of the Study:

• To create a multifunctional MgO/FeOₓ nanosheet coating on titanium implants.
• To evaluate the coating's efficacy in tumor therapy, bacterial elimination, and bone regeneration.
• To establish a promising platform for osteosarcoma treatment.

Main Methods:

• Constructed a MgO/FeOₓ nanosheet layer on a Ti implant.
• Investigated the peroxidase-like activity of MgO/FeOₓ to generate reactive oxygen species (ROS).
• Assessed the photothermal conversion capacity for synergistic tumor and bacterial killing.
• Evaluated the impact of the generated alkaline microenvironment on osteogenesis and angiogenesis in vitro and in vivo.

Main Results:

• The MgO/FeOₓ coating effectively catalyzed H₂O₂ to produce ROS, killing tumor cells.
• The coating exhibited significant photothermal conversion, enhancing antibacterial effects by creating an alkaline microenvironment.
• Mg ion release and the alkaline environment promoted osteogenic differentiation and angiogenesis.
• Accelerated bone formation was observed in vivo with the multifunctional implant.

Conclusions:

• The MgO/FeOₓ nanosheet-coated Ti implant offers a multifunctional platform for osteosarcoma treatment.
• This approach integrates tumor therapy, bacterial elimination, and bone regeneration.
• The developed implant shows significant potential for clinical application in treating osteosarcoma bone defects.