Dual-Level Reactive Oxygen Species Amplifier for Enhanced Photothermal-Chemodynamic Therapy

Area of Science:

• Biomedical Engineering
• Materials Science
• Oncology

Background:

• Chemodynamic therapy shows promise for cancer treatment but is limited by low catalytic efficiency and high glutathione (GSH) levels in tumors.
• Glutathione (GSH) can scavenge reactive oxygen species (ROS), reducing the effectiveness of therapies that rely on oxidative stress.

Purpose of the Study:

• To develop a dual-level reactive oxygen species (ROS) amplifier for enhanced photothermal-chemodynamic therapy.
• To overcome the limitations of insufficient catalytic efficiency and GSH overexpression in tumor microenvironments.

Main Methods:

• Fabrication of a poly(o-phenylenediamine) (PoPD)@copper sulfide (CuS) nanoplatform.
• Evaluation of the nanoplatform's photothermal conversion efficiency, chemodynamic activity, and GSH-depleting capability.
• Assessment of the synergistic effects of photothermal therapy and chemodynamic therapy mediated by the nanoplatform.

Main Results:

• The PoPD@CuS nanoplatform demonstrated efficient photothermal conversion, pH-responsiveness, and chemodynamic activity.
• The nanoplatform effectively depleted GSH, reducing ROS scavenging and enhancing oxidative stress.
• Spatiotemporal temperature regulation via photothermal effect boosted chemodynamic activity and ROS production.

Conclusions:

• The PoPD@CuS nanoplatform acts as a dual-level ROS amplifier, significantly enhancing photothermal-chemodynamic therapy.
• This approach offers a promising strategy for overcoming therapeutic resistance in cancer treatment.
• The developed nanoplatform shows remarkable effectiveness in combination cancer therapy.