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E2F1 inhibits MDM2 expression in a p53-dependent manner

机译:E2F1以p53依赖性方式抑制MDM2表达

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MDM2 expression is down-regulated upon E2F1 over-expression, but the mechanism is not well defined. In the current study, we found that E2F1 inhibits MDM2 expression by suppressing its promoter activity. Although E2F1 binds to the MDM2 promoter, the inhibitory effect of E2F1 on the MDM2 promoter does not require the direct binding. We demonstrate that E2F1 inhibits MDM2 promoter activity in a p53-dependent manner. Knockdown of p53 in U2OS cells impairs the inhibitory effect of E2F1 on the MDM2 promoter. Consistent with this observation, E2F1 does not inhibit MDM2 promoter activity in p53-deficient H1299 cells, and the inhibition is restored when p53 is expressed exogenously. Both E2F1 and p53 are up-regulated after DNA damage stimulation. We show that such stimulation induces E2F1 to inhibit MDM2 promoter activity and promote p53 accumulation. Furthermore, inhibition of MDM2 by E2F1 promotes E2F1 induced apoptosis. These data suggest that E2F1 regulates the MDM2-p53 pathway by inhibiting p53 induced up-regulation of MDM2.
机译:MDM2的表达在E2F1过表达时下调,但机制尚不明确。在当前的研究中,我们发现E2F1通过抑制其启动子活性来抑制MDM2的表达。尽管E2F1与MDM2启动子结合,但E2F1对MDM2启动子的抑制作用不需要直接结合。我们证明,E2F1以p53依赖性方式抑制MDM2启动子活性。敲除U2OS细胞中的p53会削弱E2F1对MDM2启动子的抑制作用。与该观察结果一致,E2F1在缺乏p53的H1299细胞中不抑制MDM2启动子活性,并且当p53外源表达时,这种抑制作用得以恢复。 DNA损伤刺激后,E2F1和p53均上调。我们显示这种刺激诱导E2F1抑制MDM2启动子活性并促进p53积累。此外,E2F1抑制MDM2会促进E2F1诱导的细胞凋亡。这些数据表明,E2F1通过抑制p53诱导的MDM2上调来调节MDM2-p53途径。

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