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Journal Article
Research Support, Non-U.S. Gov't
Apigenin potentiates TRAIL therapy of non-small cell lung cancer via upregulating DR4/DR5 expression in a p53-dependent manner.
Scientific Reports 2016 October 19
Apigenin (APG) is an edible plant-derived flavonoid that shows modest antitumor activities in vitro and in vivo. APG treatment results in cell growth arrest and apoptosis in various types of tumors by modulating several signaling pathways. In the present study, we evaluated interactions between APG and TRAIL in non-small cell lung cancer (NSCLC) cells. We observed a synergistic effect between APG and TRAIL on apoptosis of NSCLC cells. A549 cells and H1299 cells were resistant to TRAIL treatment alone. The presence of APG sensitized NSCLC cells to TRAIL-induced apoptosis by upregulating the levels of death receptor 4 (DR4) and death receptor 5 (DR5) in a p53-dependent manner. Consistently, the pro-apoptotic proteins Bad and Bax were upregulated, while the anti-apoptotic proteins Bcl-xl and Bcl-2 were downregulated. Meanwhile, APG suppressed NF-κB, AKT and ERK activation. Treatment with specific small-molecule inhibitors of these pathways enhanced TRAIL-induced cell death, mirroring the effect of APG. Furthermore, using a mouse xenograft model, we demonstrated that the combined treatment completely suppressed tumor growth as compared with APG or TRAIL treatment alone. Our results demonstrate a novel strategy to enhance TRAIL-induced antitumor activity in NSCLC cells by APG via inhibition of the NF-κB, AKT and ERK prosurvival regulators.
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