A stapled p53 helix overcomes HDMX-mediated suppression of p53.
A stapled p53 helix overcomes HDMX-mediated suppression of p53.
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DOI:
10.1016/j.ccr.2010.10.024
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发表时间:
2010-11-16
期刊:
影响因子:
50.3
通讯作者:
Walensky LD
中科院分区:
文献类型:
--
作者:
Bernal F;Wade M;Godes M;Davis TN;Whitehead DG;Kung AL;Wahl GM;Walensky LD
Cancer cells neutralize p53 by deletion, mutation, proteasomal degradation, or sequestration to achieve a pathologic survival advantage. Targeting the E3 ubiquitin ligase HDM2 can lead to a therapeutic surge in p53 levels. However, the efficacy of HDM2 inhibition can be compromised by overexpression of HDMX, an HDM2 homologue that binds and sequesters p53. Here we report that a stapled p53 helix preferentially targets HDMX, blocks the formation of inhibitory p53-HDMX complexes, induces p53-dependent transcriptional upregulation, and thereby overcomes HDMX-mediated cancer resistance in vitro and in vivo. Importantly, our analysis of p53 interaction dynamics provides a blueprint for reactivating the p53 pathway in cancer by matching HDM2, HDMX, or dual inhibitors to the appropriate cellular context.
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