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- W60885041 abstract "In order to clarify the cytotoxic mechanism of curcumin, a well-known chemopreventive agent, the cytotoxicity (by MTT method), intracellular glutathione (using GSH detection kit) and intracellular reactive oxygen species (ROS) levels (with a flow cytometer), were measured in curcumin- and tetrahydrocurcumin (TH-curcumin)-treated cancer (HSG) and normal (HGF) cells under two different oxidation conditions: irradiation with visible light (VL) and enzymatic oxidation with horseradish peroxidase (HRP)/H2O2. The cytotoxicity of curcumin was highly enhanced by VL-irradiation, whereas that of TH-curcumin was enhanced by HRP/H2O2 treatment. The cytotoxicity of curcumin against HGF cells was greater than that against HSG cells. Curcumin significantly reduced the intracellular GSH level significantly under VL-irradiation, and increased it under HRP/H2O2, whereas TH-curcumin had no effect with either oxidation treatment. HRP/H2O2 treatment of TH-curcumin enhanced generation of ROS; in contrast, VL-irradiation of curcumin was considered to produce ROS preferably. In conclusion, curcumin was highly photo-toxic, caused a decrease in GSH and mediated ROS generation. In contrast, the cytotoxicity of TH-curcumin was enhanced by enzymatic oxidation. A low-level pro-oxidant intracellular milieu induced by TH-curcumin could be effectively useful for cancer prevention." @default.
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- W60885041 date "2007-03-14" @default.
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- W60885041 title "Comparative cytotoxicity and ROS generation by curcumin and tetrahydrocurcumin following visible-light irradiation or treatment with horseradish peroxidase." @default.
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