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- W2091145752 abstract "Although previous studies suggested that the tumorigenicity of mouse double minute 2 (MDM2) was due to its negative regulation of p53, the p53-independent interactions may be equally as important. During recent studies utilizing MDM2 inhibitors, we noted that E2F transcription factor 1 (E2F1) was down regulated upon inhibition of MDM2, regardless of the p53 status of the cancer. The present study investigated the mechanisms responsible for the MDM2-mediated increase in E2F1 expression. MDM2 prolongs the half-life of the E2F1 protein by inhibiting its ubiquitination. MDM2 displaces SCF(SKP2), the E2F1 E3 ligase. Direct binding between MDM2 and E2F1 is necessary for the negative effects of MDM2 on E2F1 ubiquitination, and deletion of the MDM2 nuclear localization signal does not result in loss of the ability to increase the E2F1 protein level. The downregulation of E2F1 upon MDM2 inhibition was not due to either pRB or p14(Arf). In addition, E2F1 was responsible for at least part of the inhibition of cell proliferation induced by MDM2 knockdown. In conclusion, the present study provides evidence that stabilization of the E2F1 protein is likely another p53-independent component of MDM2-mediated tumorigenesis. More knowledge about the MDM2-E2F1 interaction may be helpful in developing novel anticancer therapies." @default.
- W2091145752 created "2016-06-24" @default.
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- W2091145752 date "2005-09-19" @default.
- W2091145752 modified "2023-09-25" @default.
- W2091145752 title "Stabilization of E2F1 protein by MDM2 through the E2F1 ubiquitination pathway" @default.
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- W2091145752 doi "https://doi.org/10.1038/sj.onc.1208814" @default.
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