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Photodynamic therapy using talaporfin sodium and semiconductor laser induces dose and time dependent cytocidal effect
Megumi Ichikawa1, Jiro Akimoto2, Srivalleesha Mallidi1
1Wellman Center for Photomedicine, Massachusetts General Hospital, Harvard Medical School, Boston, MA, USA.
Abstract:
One of the key factors contributing to the poor prognosis of glioblastoma is the treatment resistance of glioma stem cells (GSCs). In this study, the efficacy of photodynamic therapy (PDT) using talaporfin sodium (NPe6), a second-generation photosensitizer, in combination with a semiconductor laser approved for clinical use in Japan was evaluated. The evaluation was performed in a patient-derived glioma stem cell (GSC) line, MGG8, which was established from human glioblastoma tissue. Under favorable oxygenation conditions, NPe6-PDT induced a dose- and fluence-dependent suppression of mitochondrial metabolic activity in MGG8 cells. Both apoptosis and necrosis occurred in a time-dependent manner. Secondary reactive oxygen species (ROS) levels were also increased following PDT, indicating sustained intracellular oxidative stress. Given that GSC resistance is partly attributed to hypoxic microenvironments that diminish treatment-induced oxidative damage, these findings suggest that strategies to enhance tissue oxygenation could improve the therapeutic efficacy of NPe6-PDT against GSCs. To our knowledge, this is the first study to investigate NPe6-PDT in patient-derived GSCs and provides a foundation for future translational research.
Insights
Photodynamic therapy (PDT) using talaporfin sodium (NPe6) effectively reduced glioblastoma stem cell viability and induced cell death. Enhancing oxygen levels may improve NPe6-PDT efficacy against treatment-resistant glioma stem cells.
Area of Science:
- Oncology
- Biomedical Engineering
- Photochemistry
Background:
- Glioblastoma (GBM) poses a significant therapeutic challenge due to the treatment resistance of glioma stem cells (GSCs).
- Photodynamic therapy (PDT) is an emerging treatment modality with potential against resistant cancer cells.
- Talaporfin sodium (NPe6) is a second-generation photosensitizer used in PDT.
Purpose of the Study:
- To evaluate the efficacy of NPe6-based PDT against patient-derived GSCs.
- To investigate the mechanisms of cell death induced by NPe6-PDT in GSCs.
- To explore potential strategies for enhancing NPe6-PDT effectiveness.
Main Methods:
- Utilized a patient-derived GSC line (MGG8) from human glioblastoma.
- Administered NPe6 followed by semiconductor laser irradiation.
- Assessed mitochondrial metabolic activity, apoptosis, necrosis, and reactive oxygen species (ROS) levels.
Main Results:
- NPe6-PDT demonstrated dose- and fluence-dependent suppression of mitochondrial activity in MGG8 cells.
- Induced both apoptosis and necrosis in a time-dependent manner.
- Increased secondary ROS levels, indicating sustained oxidative stress.
Conclusions:
- NPe6-PDT is effective against patient-derived GSCs under normoxic conditions.
- Hypoxic microenvironments may limit PDT efficacy by reducing oxidative damage.
- Strategies to improve tissue oxygenation could enhance NPe6-PDT therapeutic outcomes for glioblastoma.
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