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Blue Light Emitting Diode Suppresses Sarcoma Cell Proliferation via the Endogenous Apoptotic Pathway Without Damaging
Shinji Kawaguchi1, Toshihiko Nishisho1, Shunichi Toki1
1Department of Orthopedics, Institute of Biomedical Sciences, Tokushima University Graduate School, Tokushima, Japan.
Background:
The development of novel therapies for sarcoma is urgently required because most sarcomas are refractory to adjuvant therapy and the treatment options are limited. Although antitumor effects of blue light (BL) have been reported for several malignant tumors, its impact on various sarcomas remains unknown. In this study, we examined the antitumor effects of BL on several kinds of bone and soft tissue sarcomas.
Methods:
We used human osteosarcoma, undifferentiated pleomorphic sarcoma, liposarcoma, and myxofibrosarcoma cell lines, as well as a human dermal fibroblast cell line as normal cells. We continuously irradiated these cells with BL in an incubator.
Results:
BL inhibited cell proliferation in sarcoma cells, but hardly affected normal cells. BL increased intracellular reactive oxygen species (ROS) levels in sarcoma cells, but not in normal cells. Interestingly, oxidative stress occurred after BL irradiation in both sarcoma and normal cells. In addition, apoptosis, autophagy, and mitochondrial dysfunction, which were induced by ROS, occurred in sarcoma cells. In undifferentiated pleomorphic sarcoma cells, BL caused cell death through activation of the endogenous apoptotic pathway, and autophagy counteracted the apoptosis.
Conclusion:
Our results indicate that BL might specifically kill sarcoma cells without injuring normal cells and may become a new treatment option for sarcoma.
Insights
Blue light (BL) shows promise as a novel sarcoma treatment. This therapy selectively targets sarcoma cells, inhibiting their growth and inducing cell death while sparing normal cells.
Area of Science:
- Oncology
- Photomedicine
Background:
- Sarcoma treatment options are limited, with many tumors resistant to conventional therapies.
- Novel therapeutic strategies are urgently needed for bone and soft tissue sarcomas.
Purpose of the Study:
- To investigate the antitumor effects of blue light (BL) on various human sarcoma cell lines.
- To determine if BL exhibits selective toxicity towards sarcoma cells compared to normal cells.
Main Methods:
- Human sarcoma cell lines (osteosarcoma, undifferentiated pleomorphic sarcoma, liposarcoma, myxofibrosarcoma) and normal dermal fibroblasts were continuously irradiated with BL.
- Intracellular reactive oxygen species (ROS) levels, apoptosis, autophagy, and mitochondrial dysfunction were assessed.
Main Results:
- BL inhibited proliferation in all tested sarcoma cell lines but had minimal impact on normal fibroblasts.
- BL increased ROS levels in sarcoma cells, leading to apoptosis, autophagy, and mitochondrial dysfunction.
- In undifferentiated pleomorphic sarcoma, BL induced cell death via apoptosis, with autophagy playing a counteracting role.
Conclusions:
- Blue light demonstrates specific antitumor effects against sarcoma cells, suggesting potential as a novel therapeutic approach.
- BL may offer a targeted treatment option for sarcomas, minimizing damage to healthy tissues.
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