CeO₂-Decorated Metal-Organic Framework for Enhanced Photodynamic Therapy

Area of Science:

• Biomedical Engineering
• Nanotechnology
• Cancer Therapy

Background:

• Photodynamic therapy (PDT) shows promise for cancer treatment but faces limitations including tumor hypoxia, poor targeting, and photosensitizer aggregation.
• Hypoxic tumor microenvironments reduce the efficacy of PDT due to insufficient oxygen for photosensitizer activation.
• Targeting strategies are crucial for delivering therapeutic agents specifically to cancer cells, minimizing off-target effects.

Purpose of the Study:

• To develop a novel nanoplatform, PCN-224@CeO2-HA, for enhanced PDT and targeted cancer treatment.
• To address tumor hypoxia by utilizing CeO2 nanoparticles to generate oxygen in situ.
• To improve tumor targeting and cellular uptake via hyaluronic acid (HA) modification for CD44 receptor recognition.

Main Methods:

• Fabrication of hyaluronic acid-modified CeO2-nanoparticle-decorated metal-organic frameworks (PCN-224@CeO2-HA).
• In vitro evaluation of oxygen generation, targeting, and cytotoxicity against 4T1, MCF-7, and LO2 cells under laser irradiation.
• In vivo assessment of nanoparticle aggregation in tumors, tumor growth inhibition, and biocompatibility after intratumoral injection and laser irradiation.

Main Results:

• PCN-224@CeO2-HA effectively catalyzed H2O2 to produce O2, alleviating tumor hypoxia.
• The HA modification enabled targeted accumulation of nanoparticles in CD44-overexpressing tumor cells (4T1 and MCF-7), with minimal impact on normal LO2 cells.
• In vivo studies demonstrated significant tumor aggregation of PCN-224@CeO2-HA and remarkable inhibition of tumor growth upon laser irradiation, alongside good biocompatibility.

Conclusions:

• PCN-224@CeO2-HA is a promising nanoplatform for enhancing PDT efficacy by overcoming hypoxia and achieving targeted cancer therapy.
• The developed material exhibits excellent biocompatibility and potent antitumor activity, offering a new strategy for in situ oxygen generation in cancer treatment.
• This approach holds potential for improving clinical outcomes in photodynamic therapy for various solid tumors.