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Updated: Feb 18, 2026
Photodynamic Therapy with Blended Conducting Polymer/Fullerene Nanoparticle Photosensitizers
Published on: October 28, 2015
pH-Responsive Aerobic Nanoparticles for Effective Photodynamic Therapy
Lingyue Shen1, Yu Huang2, Dong Chen2
1Department of Oral & Maxillofacial-Head & Neck Oncology, Shanghai Key Laboratory of Stomatology Cosmetic Laser Center, Ninth People's Hospital, Shanghai Jiao Tong University School of Medicine, Shanghai 200011, P. R. China.
This study developed pH-responsive nanoparticles that generate oxygen for photodynamic therapy (PDT). This approach enhances anti-cancer efficacy in hypoxic tumors by overcoming oxygen deficiency.
Area of Science:
- Biomedical Engineering
- Nanotechnology
- Cancer Therapy
Background:
- Photodynamic therapy (PDT) efficacy is limited by tumor hypoxia.
- Hypoxic microenvironments reduce oxygen-dependent cancer treatment effectiveness.
Purpose of the Study:
- To develop a novel oxygen-self-sufficient drug delivery system for enhanced PDT.
- To overcome hypoxia-induced limitations in cancer treatment.
Main Methods:
- Prepared pH-responsive aerobic nanoparticles using Catalase and Chitosan.
- Encapsulated Chlorin e6 (Ce6) photosensitizer within the nanoparticles.
- Investigated nanoparticle stability, cellular uptake, and drug release in acidic conditions.
Main Results:
- Nanoparticles showed stability and efficient tumor cell uptake via EPR effect.
- Acidic conditions triggered nanoparticle disassembly, releasing Catalase and Ce6.
- Irradiation in acidic environments generated singlet oxygen, enhancing PDT efficacy in vitro and in vivo.
Conclusions:
- Developed a pH-triggered strategy to overcome hypoxia for effective PDT.
- Oxygen-self-sufficient nanoparticles demonstrated superior anticancer activity compared to free Ce6.
- This approach offers a promising solution for treating hypoxic tumors with PDT.
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