Custom-Made Piezoelectric Solid Solution Material for Cancer Therapy.

Area of Science:

• Biomedical Engineering
• Materials Science
• Nanotechnology

Background:

• Piezoelectric materials offer potential for cancer therapy via sonodynamic therapy (SDT).
• Conventional piezoelectric materials have limitations in medical applications.
• Modulating energy band structures is crucial for optimizing piezoelectric material performance in medicine.

Purpose of the Study:

• To synthesize PEGylated piezoelectric solid solution nanoparticles (0.7BiFeO3 -0.3BaTiO3 NPs, P-BF-BT NPs) with tuned energy band structures.
• To enable P-BF-BT NPs to produce superoxide radicals and oxygen via water splitting through the piezoelectric effect.
• To augment chemodynamic therapy (CDT) with ultrasound-initiated Fenton reactions for enhanced cancer treatment.

Main Methods:

• Synthesis of PEGylated 0.7BiFeO3 -0.3BaTiO3 nanoparticles (P-BF-BT NPs).
• Band engineering to tune the electronic structure of P-BF-BT NPs.
• In vitro and in vivo studies to evaluate therapeutic efficacy and biosafety.
• Utilizing the piezoelectric effect for water splitting and initiating Fenton reactions.

Main Results:

• Achieved excellent piezoelectric properties and tuned band structure in P-BF-BT NPs.
• Synchronous production of superoxide radicals and oxygen self-supply via water splitting.
• Ultrasound-initiated piezo-Fenton process enabled synergistic SDT/CDT.
• Demonstrated effective hypoxic tumor elimination with high therapeutic biosafety in vitro and in vivo.

Conclusions:

• Engineered piezoelectric nanoparticles (P-BF-BT NPs) offer a novel strategy for multimodal imaging-guided cancer therapy.
• The tuned band structure facilitates synergistic sonodynamic and chemodynamic therapy via the piezo-Fenton process.
• This approach presents a promising platform for developing "custom-made" piezoelectric materials for future cancer treatments.