Enhanced inhibitory effect of curcumin via reactive oxygen species generation in human nasopharyngeal carcinoma cells following purple‑light irradiation

Wang,Dujuan; Hu,Jiang; Lv,Lin; Xia,Xiuwen; Liu,Jianzhong; Li,Xiaoyuan

doi:10.3892/ol.2013.1341

Enhanced inhibitory effect of curcumin via reactive oxygen species generation in human nasopharyngeal carcinoma cells following purple‑light irradiation

Authors:
- Dujuan Wang
- Jiang Hu
- Lin Lv
- Xiuwen Xia
- Jianzhong Liu
- Xiaoyuan Li
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Affiliations: Department of Pathology and Pathophysiology, Zhongshan School of Medicine, Sun Yat‑Sen University, Guangzhou, Guangdong 510080, P.R. China, Department of Biomedical Engineering, Zhongshan School of Medicine, Sun Yat‑Sen University, Guangzhou, Guangdong 510080, P.R. China, Department of Cell Biology, Zhongshan School of Medicine, Sun Yat‑Sen University, Guangzhou, Guangdong 510080, P.R. China
Published online on: May 8, 2013 https://doi.org/10.3892/ol.2013.1341
Pages: 81-85

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Abstract

Curcumin, a traditional medicine, exhibits anticarcinogenic properties in various cell lines and animals. As a phenolic compound, curcumin is light‑sensitive and photoactived curcumin exhibits a greater anticancer effect compared with curcumin alone. However, the mechanisms by which curcumin inhibits tumor cell growth in human nasopharyngeal carcinoma (NPC) cells following purple light (PL) irradiation remains unclear. In the present study, CNE1 and CNE2 cells were treated with curcumin and exposed to PL at various energy densities to determine the anticancer activity of curcumin using MTT assays, staining and flow cytometry. The subsequent changes in the cell viability, morphology, cell cycle, apoptosis and reactive oxygen species (ROS) generation were measured. Curcumin inhibited cell growth in a dose‑dependent manner. CNE1 and CNE2 cells tended to be arrested at the S or G2/M cell cycle stages following curcumin treatment and the levels of ROS increased in a time‑dependent manner. However, after treatment with curcumin followed by PL irradiation, the levels of cytotoxicity and apoptotic cell death were significantly increased compared with the curcumin-only group. ROS generation was also enhanced in an energy‑dependent manner. In summary, following PL irradiation, the anticancer effect of curcumin in human NPC cells was increased through apoptosis and cell cycle arrest.

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