Multifunctional Nanoparticles as Radiosensitizers to Overcome Hypoxia-Associated Resistance in Cancer Radiotherapy

Area of Science:

• Biomedical Engineering
• Nanotechnology
• Oncology

Background:

• Tumor hypoxia is a major challenge in cancer treatment, causing resistance to radiotherapy and chemotherapy.
• Developing novel oxygen carriers is crucial for improving oncological outcomes.
• Current treatments face limitations due to tumor microenvironment complexities.

Purpose of the Study:

• To develop and evaluate a new multifunctional oxygen carrier, SPIO@PFH-CHC nanodroplets, for cancer therapy.
• To investigate the potential of these nanodroplets as radiosensitizers and in chemodynamic therapy.
• To assess the efficacy and safety profile of SPIO@PFH-CHC nanodroplets in hypoxic tumors.

Main Methods:

• Synthesis and characterization of carboxymethyl hexanoyl chitosan (CHC) nanodroplets decorated with perfluorohexane (PFH) and superparamagnetic iron oxide (SPIO) nanoparticles.
• Evaluation of oxygen-carrying capacity and tumor oxygenation enhancement.
• Assessment of radiosensitizing effects, chemodynamic therapy potential (Fenton reaction), and cytotoxicity in vitro and in vivo.

Main Results:

• SPIO@PFH-CHC nanodroplets effectively augment oxygen levels in hypoxic tumor tissues.
• The nanodroplets exhibit dual mechanisms: enhancing radiosensitivity via oxygen fixation and enabling chemodynamic therapy through ROS generation.
• Demonstrated low cytotoxicity and enhanced cellular uptake, indicating a favorable safety profile.

Conclusions:

• SPIO@PFH-CHC nanodroplets are a promising multifunctional platform for cancer treatment.
• These nanodroplets can overcome tumor hypoxia-induced radioresistance and chemoresistance.
• The developed nanocarrier shows significant potential as an efficient radiosensitizer for radiation therapy.