Morin inhibits 12-O-tetradecanoylphorbol-13-acetate-induced hepatocellular transformation via activator protein 1 signaling pathway and cell cycle progression |
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Authors: | Hsiang Chien-Yun Wu Shih-Lu Ho Tin-Yun |
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Affiliation: | Graduate Institute of Medical Science, China Medical University, Taichung, Taiwan. cyhsiang@mail.cmu.edu.tw |
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Abstract: | Flavonoids are constituents of fruits, vegetables, and plant-derived beverages, as well as components in herbal containing dietary supplements. They exhibit a remarkable spectrum of biochemical and pharmacological activities. In this study, we examined morin (3,5,7,2',4'-pentahydroxyflavone) for its effect on 12-O-tetradecanoylphorbol-13-acetate (TPA)-treated human hepatocytes. Morin inhibited TPA-induced cellular transformation in Chang liver cells in a dose-dependent manner. Luciferase assay and electrophoretic mobility shift assay revealed that morin suppressed TPA-induced AP-1 activity, and the inhibition of AP-1 activity by morin was mediated through the inhibition of p38 kinase. Moreover, morin induced the S-phase arrest and inhibited the DNA synthesis in TPA-treated hepatocytes, suggesting that a cell cycle checkpoint was activated by morin to block DNA synthesis in S phase. In conclusion, our results suggested that morin was a potent anti-hepatocellular transformation agent that inhibited cellular transformation by suppressing the AP-1 activity and inducing the S-phase arrest in human hepatocytes. |
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Keywords: | TPA, 12-O-tetradecanoylphorbol-13-acetate AP-1, activator protein 1 MAP, mitogen-activated protein ATCC, American Type Culture Collection MTT, 3-(4,5-dimethylthiazol-2-yl)-2,5-diphenyltetrazolium bromide DMEM, Dulbecco modified Eagle medium FBS, fetal bovine serum INT, p-iodonitrotetrazolium violet RLU, relative luciferase unit EMSA, electrophoretic mobility shift assay JNKs, c-Jun N-terminal kinases ERKs, extracellular signal-regulated kinases MEK 1/2, MAP kinase kinase 1/2 |
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