New CeF

Area of Science:

• Nanotechnology
• Materials Science
• Cancer Therapy

Background:

• Photodynamic therapy (PDT) is a promising cancer treatment.
• Radiotherapy often causes significant side effects due to high doses.
• Novel materials are needed to enhance radiotherapy efficacy and reduce toxicity.

Purpose of the Study:

• To synthesize and characterize a novel all-inorganic nanocomposite (NC) for self-lighted photodynamic therapy.
• To evaluate the NC's performance in enhancing x-ray therapy and generating cytotoxic reactive oxygen species.
• To assess the NC's efficacy in reducing cancer cell viability.

Main Methods:

• The NC was synthesized combining Cerium Fluoride (CeF3) and Zinc Oxide (ZnO).
• Characterization involved electron microscopy (TEM, STEM), energy dispersive x-ray spectrometry, and fluorescence spectroscopy.
• In vitro studies used human adenocarcinoma cells (A549) to assess cell cycle, viability, and clonogenic survival.

Main Results:

• The NC, composed of CeF3 and ZnO, effectively absorbs x-rays and activates ZnO to produce singlet oxygen.
• In the dark, the NC inhibited A549 cell cycle progression before mitosis.
• Low-dose x-ray irradiation (2 Gy) in combination with the NC generated reactive oxygen species, further blocking cell cycle and reducing cell viability by 18% compared to additive effects.

Conclusions:

• The developed all-inorganic nanocomposite demonstrates potential for self-lighted photodynamic therapy.
• The NC enhances the efficacy of x-ray radiotherapy by generating singlet oxygen.
• This novel approach may enable reduced radiotherapy doses, thereby minimizing unwanted side effects.