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• W2509525501 abstract "Hypocrellin B (HB), a natural perylenequinone pigment, has been successfully employed in the photodynamic therapy (PDT) in a variety of human cancer cells due to its high singlet oxygen yield. To investigate the generation of nitric oxide (NO) and its role on cancer cell death induced by PDT, we used human hepatocellular carcinoma (HepG2) cells and HB as a photosensitizer. HB/light treatment decreased the growth of HepG2 cells in a dose-dependent manner with an IC50 of 3.10 μM, activated caspase-3, -9 and induced apoptosis in HepG2 cells. It was found that exposure of the cells to HB/light resulted in inducible nitric oxide synthase (iNOS) activation and followed by significant increase in NO generation. Incubating cells with a NOS inhibitor Nω-monomethyl-l-arginine (l-NMMA) and an NO scavenger 2-(4-carboxyphenyl)-4, 4, 5, 5-tetramethylimidazoline-1-oxyl-3-oxide (cPTIO) enhanced HB/light-induced caspase-3, -9 activation and apoptosis significantly while decreasing DAF fluorescence-assessed NO generation substantially. Cells could be rescued from HB/light-induced apoptosis by an exogenous NO donor, sodium nitroprusside (SNP). Our findings suggested that induced NO was acting cytoprotectively and PDT efficacy of HB could be improved by using pharmacological modulators of NO or NOS." @default.
• W2509525501 created "2016-09-16" @default.
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• W2509525501 date "2016-10-01" @default.
• W2509525501 modified "2023-09-26" @default.
• W2509525501 title "Cytoprotective role of nitric oxide in HepG2 cell apoptosis induced by hypocrellin B photodynamic treatment" @default.
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• W2509525501 doi "https://doi.org/10.1016/j.jphotobiol.2016.09.006" @default.
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