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Photodynamic effects of pyropheophorbide-a methyl ester in nasopharyngeal carcinoma cells
Chuan Shan Xu1, Albert Wing Nang Leung
1Institute of Ultrasound Imaging, Chongqing University of Medical Sciences, Chongqing, China.
Background:
Nasopharyngeal carcinoma (NPC) is one of the most common cancers, and exploring novel therapeutic modalities will improve the clinical outcomes. It has been confirmed that photodynamic therapy can efficiently deactivate malignant cells. The aim of the present study was to explore the photodynamic effects of pyropheophorbide-a methyl ester (MPPa) in CNE2 nasopharyngeal carcinoma cells.
Material/Methods:
CNE2 cells were subjected to photodynamic therapy with MPPa, in which the drug concentration was 0.25 to 4 microM and light energy 1 to 8 J/cm(2). Photodynamic toxicity was investigated 24 h after treatment. Apoptosis was determined using flow cytometry with annexin V-FITC and propidum iodine staining and with nuclear staining with Hoechst 33258. The mitochondrial membrane potential (DeltaPsim) was evaluated by Rhodamine 123 assay.
Results:
There was no dark cytotoxicity of MPPa in the CNE2 cells at doses of 0.25-4 microM, and MPPa resulted in dose- and light-dependent phototoxicity. The apoptotic rate 8 h after PDT with MPPa (2 microM) increased to 16.43% under a light energy of 2 J/cm(2). Mitochondrial membrane potential (DeltaPsim) collapsed when the CNE2 cells were exposed to 2 microM MPPa for 20 h and then 2 J/cm(2) irradiation.
Conclusions:
Photodynamic therapy with MPPa significantly enhanced apoptosis and the collapse of DeltaPsim. This can be developed for treating nasopharyngeal carcinoma.
Insights
Photodynamic therapy using pyropheophorbide-a methyl ester (MPPa) effectively targets nasopharyngeal carcinoma cells. MPPa treatment significantly increased cancer cell death and mitochondrial dysfunction, showing promise for NPC treatment.
Area of Science:
- Oncology
- Photomedicine
Background:
- Nasopharyngeal carcinoma (NPC) is a prevalent cancer requiring novel treatments.
- Photodynamic therapy (PDT) is a proven method for cancer cell deactivation.
Purpose of the Study:
- To investigate the photodynamic effects of pyropheophorbide-a methyl ester (MPPa) on CNE2 nasopharyngeal carcinoma cells.
- To assess MPPa's potential as a therapeutic agent for NPC.
Main Methods:
- CNE2 cells were treated with MPPa (0.25–4 μM) and varying light energy (1–8 J/cm²).
- Phototoxicity, apoptosis (flow cytometry, nuclear staining), and mitochondrial membrane potential (ΔΨm) were evaluated.
Main Results:
- MPPa exhibited no dark toxicity but demonstrated dose- and light-dependent phototoxicity.
- PDT with 2 μM MPPa and 2 J/cm² light increased apoptosis to 16.43%.
- MPPa and irradiation induced mitochondrial membrane potential collapse.
Conclusions:
- Photodynamic therapy with MPPa significantly enhances apoptosis and mitochondrial dysfunction in NPC cells.
- MPPa-based PDT shows potential for nasopharyngeal carcinoma treatment development.
