Nature Cell Biology
3, 973 - 982 (2001)
doi:10.1038/ncb1101-973
There is a Corrigendum (September 2002) associated with this Article.
HER-2/neu induces p53 ubiquitination via Akt-mediated MDM2 phosphorylationBinhua P. Zhou1, 2, Yong Liao1, 2, Weiya Xia1, Yiyu Zou1, Bill Spohn1
& Mien-Chie Hung11
Department of Molecular and Cellular Oncology, Breast Cancer Basic Research Program, The University of Texas M. D. Anderson Cancer Center, Houston, Texas 77030, USA
2
These authors contributed equally to this work
Correspondence should be addressed to Mien-Chie Hung mhung@notes.mdacc.tmc.eduPublished 8 October 2001
HER-2/neu amplification or overexpression can make cancer cells resistant to apoptosis and promotes their growth. p53 is crucial in regulating cell growth and apoptosis, and is often mutated or deleted in many types of tumour. Moreover, many tumours with a wild-type gene for p53 do not have normal p53 function, suggesting that some oncogenic signals suppress the function of p53. In this study, we show that HER-2/neu-mediated resistance to DNA-damaging agents requires the activation of Akt, which enhances MDM2-mediated ubiquitination and degradation of p53. Akt physically associates with MDM2 and phosphorylates it at Ser166 and Ser186. Phosphorylation of MDM2 enhances its nuclear localization and its interaction with p300, and inhibits its interaction with p19ARF, thus increasing p53 degradation. Our study indicates that blocking the Akt pathway mediated by HER-2/neu would increase the cytotoxic effect of DNA-damaging drugs in tumour cells with wild-type p53.
You have created an error.
|
