GSH-Responsive and Hypoxia-Activated Multifunctional Nanoparticles for Synergetically Enhanced Tumor Therapy

Area of Science:

• Biomedical Engineering
• Nanomedicine
• Cancer Therapy

Background:

• Chemodynamic therapy (CDT) and photodynamic therapy (PDT) show promise for synergistic antitumor effects.
• Tumor hypoxia and glutathione (GSH) hinder the efficacy of combined CDT and PDT strategies.
• Metal coordination-based nanomedicines offer a novel approach to overcome tumor microenvironment challenges.

Purpose of the Study:

• To develop novel metal-coordinated multifunctional nanoparticles (NPs) for synergistic cancer treatment.
• To address limitations of tumor hypoxia and GSH in existing therapeutic strategies.
• To create a nanomedicine platform utilizing copper ions, indocyanine green (ICG), and tirapazamine (TPZ).

Main Methods:

• Synthesized Cu-ICG/TPZ NPs via Cu2+-triggered assembly of ICG and TPZ.
• Utilized the enhanced permeability and retention (EPR) effect for tumor accumulation.
• Investigated nanoparticle-triggered cascade reactions including hyperthermia, GSH elimination, and reactive oxygen species (ROS) generation.

Main Results:

• Cu-ICG/TPZ NPs demonstrated effective tumor accumulation via the EPR effect.
• The NPs triggered hyperthermia, GSH elimination, and Cu+-mediated hydroxyl radical (•OH) generation.
• Hypoxia-activated TPZ exhibited a chemotherapeutic effect, leading to synergistic tumor therapy.
• In vitro and in vivo studies confirmed satisfactory therapeutic efficacy and biosafety.

Conclusions:

• Novel Cu-ICG/TPZ NPs offer a promising strategy for synergistic cancer treatment.
• The developed nanomedicine effectively overcomes tumor hypoxia and GSH inhibition.
• These metallodrug nanoagents hold significant potential for enhanced tumor therapy with excellent biosafety.