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Updated: May 31, 2025

Photodynamic Therapy with Blended Conducting Polymer/Fullerene Nanoparticle Photosensitizers
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Multifunctional Near Infrared Polymer Dots for Enhanced Synergistic Photodynamic/Photothermal Effect In Vitro.

Yingfen Wu1, Diane C Darland2, Colin K Combs3

  • 1Department of Chemistry, University of North Dakota, Grand Forks, North Dakota 58202, United States.

ACS Applied Bio Materials
|January 22, 2025
PubMed
Summary

This study developed multifunctional nanoparticles that convert tumor hydrogen peroxide into oxygen, enhancing photodynamic therapy (PDT) and photothermal therapy (PTT) for cancer treatment. These nanoparticles show promise for improved cancer cell ablation with reduced side effects.

Keywords:
MnPCPDTBTPSMAPdotscancer treatment

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Area of Science:

  • Biomedical Engineering
  • Nanotechnology
  • Oncology

Background:

  • Synergistic photodynamic/photothermal therapy (PDT/PTT) offers enhanced cancer cell ablation but is limited by tumor hypoxia.
  • Low oxygen levels in tumors impede the efficacy of PDT/PTT due to insufficient reactive oxygen species generation and thermal distribution.

Purpose of the Study:

  • To develop multifunctional nanoparticles capable of converting tumor hydrogen peroxide into oxygen to overcome hypoxia.
  • To enhance the efficiency of synergistic PDT/PTT by improving oxygen levels and photosensitizer performance.

Main Methods:

  • Synthesized manganese-doped polymer dots (Pdots) using poly(styrene-co-maleic anhydride) and a near-infrared photosensitizer (PCPDTBT).
  • Incorporated manganese ions into Pdots to catalyze the conversion of hydrogen peroxide (H2O2) to oxygen (O2).
  • Evaluated Pdot performance for singlet oxygen generation, photothermal conversion efficiency, and in vitro cytotoxicity in MCF7 cells.

Main Results:

  • Mn-doped Pdots significantly increased O2 production and singlet oxygen quantum yield in the presence of H2O2.
  • Achieved a photothermal conversion efficiency of 53% for Pdots.
  • Demonstrated biocompatibility and pronounced cancer cell killing under laser irradiation via synergistic PDT/PTT.

Conclusions:

  • Developed Pdots effectively overcome tumor hypoxia by generating oxygen from H2O2.
  • The multifunctional nanoparticles show potential for balancing PDT and PTT performance.
  • These Pdots enhance therapeutic efficacy for in vitro cancer treatment, highlighting their promise for future clinical applications.