Magnetically driven thermoelectric-ROS cascade conversion in a scaffold for bone tumor and infection therapy

Area of Science:

• Biomaterials Engineering
• Nanotechnology
• Oncology

Background:

• Thermoelectric materials can convert temperature gradients into reactive oxygen species (ROS) for antitumor and antibacterial effects.
• Clinical application of thermoelectric materials for bone tumors is limited by the lack of spatiotemporal control over ROS release.

Purpose of the Study:

• To develop a magnetothermal-thermoelectric heterojunction scaffold for spatiotemporally controlled ROS generation in bone tissue.
• To investigate the synergistic therapeutic effects of magnetothermal, thermoelectric, and chemodynamic therapies for postoperative bone tumor treatment.

Main Methods:

• Fabrication of a Bi2Te3-MnFe2O4 heterojunction scaffold using additive manufacturing.
• Activation of ROS generation via alternating magnetic field-induced magnetothermal and thermoelectric effects.
• Evaluation of antitumor and antibacterial efficacy through in vitro and in vivo experiments.

Main Results:

• The scaffold successfully generated ROS in a controlled manner under an alternating magnetic field.
• ROS induced mitochondrial dysfunction and apoptosis in bone tumor cells and effectively killed bacteria.
• The combined magnetothermal, thermoelectric, and chemodynamic effects demonstrated synergistic therapeutic outcomes.

Conclusions:

• The developed magnetothermal-thermoelectric scaffold provides an innovative approach for comprehensive postoperative treatment of bone tumors.
• This strategy offers precise control over ROS generation, overcoming limitations of previous thermoelectric materials.
• The integrated therapeutic modalities present a promising solution for addressing both tumor recurrence and infection in bone cancer patients.