Hydrogen Peroxide Responsive Hafnium-Based Nanomaterials for Enhanced Tumor Radiosensitization

Area of Science:

• Materials Science
• Nanotechnology
• Radiotherapy

Background:

• Solid tumor therapy faces challenges from intrinsic tumor hypoxia and radioresistance.
• Developing effective radiosensitization strategies is crucial for improving treatment outcomes.

Purpose of the Study:

• To design and evaluate an intelligent Pt@Hf MOF nanotherapy platform for enhanced radiotherapy.
• To investigate the platform's ability to overcome tumor hypoxia and radioresistance through synergistic radiosensitization.

Main Methods:

• Rational design of a Pt@Hf MOF nanocomposite integrating dual high-Z elements (Pt, Hf).
• Evaluation of physical radiosensitization via enhanced X-ray energy deposition.
• Assessment of chemical radiosensitization through dual-enzyme activities (catalase-like and H2O2 catalysis).
• In vitro and in vivo studies to assess tumor inhibition and apoptosis induction.

Main Results:

• The Pt@Hf MOF platform significantly enhances X-ray energy deposition.
• The nanocomposite alleviates tumor hypoxia and reverses radioresistance via catalase-like activity.
• Dual-enzyme activities generate toxic hydroxyl radicals, inducing DNA damage and oxidative stress.
• Effective inhibition of tumor proliferation and induction of apoptosis observed in vitro and in vivo.
• Remarkable tumor suppression achieved in a triple-negative breast cancer model.

Conclusions:

• The Pt@Hf MOF nanotherapy platform offers a promising strategy for precision radiotherapy.
• Integrating microenvironment modulation with multimodal killing provides a robust approach against refractory solid tumors.
• This work presents a paradigm shift in radiotherapy by addressing hypoxia and enhancing radiosensitivity.