Abstract
Purpose: To study the anticancer effect of licoflavanone against human nasopharyngeal HKI carcinoma, and the mechanism involved.
 Methods: The 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyl tetrazolium bromide (MTT) assay was used to determine the effect of licoflavanone on cell viability, while DAPI staining and western blotting were used to study its proapoptotic effect. Morphological examination was performed under phase contrast microscopy. Transwell chamber assays were used to study cell migration and invasion. The expression levels of mTOR/PI3K/AKT signal pathway-related proteins were assayed by Western blotting.
 Results: Licoflavanone markedly suppressed the proliferation of nasopharyngeal HK1 cancer cells in a concentration-reliant pattern (p < 0.01). The anticancer effects of licoflavanone were mediated via induction of pro-apoptotic effects and blocking of mTOR/PI3K/AKT signal pathway. Licoflavanone enhanced the activities of caspase-3, caspase-8, caspase-9 and cleaved caspase-3, as well as Bax and Bad. Moreover, licoflavanone blocked the migration and invasion of HK1 nasopharyngeal cancer cells.
 Conclusion: Licoflavanone exerts potent anticancer effects on human nasopharyngeal cancer cells via caspase activation, inhibition of cell migration and cell invasion, and down-regulation of m-TOR/PI3K/AKT signal pathway. Therefore, licoflavanone may be a useful lead drug for the development of a treatment strategy for nasopharyngeal cancer.
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