Photo-oxidative killing of human colonic cancer cells using indocyanine green and infrared light
1999
Killing Colonic Cancer Cells with Light and a Special Dye
publication
Evidence: moderate
Author Information
Author(s): Bäumler W, Abels C, Karrer S, Weiß T, Messmann H, Landthaler M, Szeimies R-M
Primary Institution: University of Regensburg
Hypothesis
The study investigates the efficacy and mechanism of action of indocyanine green (ICG) in photodynamic therapy for colonic cancer cells.
Conclusion
Indocyanine green effectively kills colonic cancer cells through the generation of singlet oxygen and lipid peroxides.
Supporting Evidence
- Cells treated with 500 μM ICG showed significantly lower viability after laser irradiation.
- Using D2O with 100 μM ICG increased lipid peroxidation markers.
- Quenchers of singlet oxygen reduced cell killing, indicating its role in the process.
Takeaway
This study shows that a special dye can help kill cancer cells when exposed to light, which could be useful for treating cancer.
Methodology
HT-29 cells were treated with different concentrations of ICG and irradiated with a diode laser to assess cell viability.
Digital Object Identifier (DOI)
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