Restoration of tumor suppression in prostate cancer by targeting the E3 ligase E6AP
Journal Title
Oncogene
Publication Type
Journal Article in press
Abstract
Restoration of tumor suppression is an attractive onco-therapeutic approach. It is particularly relevant when a tumor suppressor is excessively degraded by an overactive oncogenic E3 ligase. We previously discovered that the E6-associated protein (E6AP; as classified in the human papilloma virus context) is an E3 ligase that has an important role in the cellular stress response, and it directly targets the tumor-suppressor promyelocytic leukemia protein (PML) for proteasomal degradation. In this study, we have examined the role of the E6AP-PML axis in prostate cancer (PC). We show that knockdown (KD) of E6AP expression attenuates growth of PC cell lines in vitro. We validated this finding in vivo using cell line xenografts, patient-derived xenografts and mouse genetics. We found that KD of E6AP attenuates cancer cell growth by promoting cellular senescence in vivo, which correlates with restoration of tumor suppression by PML. In addition, we show that KD of E6AP sensitizes cells to radiation-induced death. Overall, our findings demonstrate a role for E6AP in the promotion of PC and support E6AP targeting as a novel approach for PC treatment, either alone or in combination with radiation.Oncogene advance online publication, 19 September 2016; doi:10.1038/onc.2016.159.
Publisher
Springer Nature
WEHI Research Division(s)
Molecular Genetics Of Cancer
PubMed ID
27641331
NHMRC Grants
NHMRC/1049720
Rights Notice
Refer to copyright notice on published article.


Creation Date: 2016-10-04 09:29:41
Last Modified: 2016-10-04 11:57:19
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