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• W2056522555 abstract "The activation of mitogen-activated protein/extracellular signal-regulated kinase (MEK) is well known to be associated with tumor invasion and metastasis. We previously reported that a polymethoxyflavonoid, nobiletin (5,6,7,8,3',4'-hexamethoxyflavone), derived from Citrus depressa (Hayata), inhibits the phosphorylation of MEK and thereby suppresses matrix metalloproteinase (MMP) expression in a tumor-metastasis stimulator, 12-O-tetradecanoyl phorbol 13-acetate (TPA)-stimulated human fibrosarcoma HT-1080 cells [Mol. Cancer Ther. 3 (2004) 839-847]. In the present study, we investigated whether or not nobiletin might directly influence MEK activity to exhibit the antitumor metastatic activity in vitro. MEK kinase assay using myelin basic protein (MBP) revealed that TPA-augmented MEK activity in HT-1080 cells and that the augmented MEK activity was diminished by nobiletin treatment. In addition, the decrease in MEK activity caused by nobiletin was found to inhibit the phosphorylation of extracellular regulated kinases (ERK), a downstream signaling factor for MEK. Furthermore, when an immunoprecipitated active MEK was incubated with nobiletin under cell-free conditions, nobiletin was found to inhibit the MEK-mediated MBP phosphorylation. In contrast, other citrus polymethoxyflavonoids such as 3-hydroxy-5,6,7,8,3',4'-hexamethoxyflavone (natsudaidain) and 3,5,6,7,8,3',4'-heptamethoxyflavone, did not directly inhibit MEK activity. Moreover, natsudaidain and 3,5,6,7,8,3',4'-heptamethoxyflavone exhibited no or less inhibitory effect than nobiletin on the proMMP-9/progelatinase B production in HT-1080 cells. Therefore, these results provide novel evidence that nobiletin directly inhibits MEK activity and decreases the sequential phosphorylation of ERK, exhibiting the antitumor metastatic activity by suppressing MMP expression in HT-1080 cells." @default.
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• W2056522555 date "2008-02-01" @default.
• W2056522555 modified "2023-10-12" @default.
• W2056522555 title "A citrus polymethoxyflavonoid, nobiletin, is a novel MEK inhibitor that exhibits antitumor metastasis in human fibrosarcoma HT-1080 cells" @default.
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• W2056522555 doi "https://doi.org/10.1016/j.bbrc.2007.11.100" @default.
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