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    E6AP promotes prostate cancer by reducing p27 expression

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    Author
    Raghu, D; Paul, PJ; Gulati, T; Deb, S; Khoo, C; Russo, A; Gallo, E; Blandino, G; Chan, A-L; Takano, E; ...
    Date
    2017-06-27
    Source Title
    Oncotarget
    Publisher
    IMPACT JOURNALS LLC
    University of Melbourne Author/s
    Gulati, Twishi; Sandhu, Shahneen; Fox, Stephen; Williams, Scott; Gamell-Fulla, Cristina; Haupt, Ygal; Raghu, Dinesh; Paul, Piotr Jan; Haupt, Susan
    Affiliation
    Sir Peter MacCallum Department of Oncology
    Clinical Pathology
    Bio21
    Metadata
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    Document Type
    Journal Article
    Citations
    Raghu, D., Paul, P. J., Gulati, T., Deb, S., Khoo, C., Russo, A., Gallo, E., Blandino, G., Chan, A. -L., Takano, E., Sandhu, S. K., Fox, S. B., Williams, S., Haupt, S., Gamell, C. & Haupt, Y. (2017). E6AP promotes prostate cancer by reducing p27 expression. ONCOTARGET, 8 (26), pp.42939-42948. https://doi.org/10.18632/oncotarget.17224.
    Access Status
    Open Access
    URI
    http://hdl.handle.net/11343/259340
    DOI
    10.18632/oncotarget.17224
    NHMRC Grant code
    NHMRC/1063389
    Abstract
    Prostate cancer (PC) is the most common cancer in men. Elevated levels of E3 ligase, E6-Associated Protein (E6AP) were previously linked to PC, consistent with increased protein expression in a subset of PC patients. In cancers, irregular E3 ligase activity drives proteasomal degradation of tumor suppressor proteins. Accordingly, E3 ligase inhibitors define a rational therapy to restore tumor suppression. The relevant tumor suppressors targeted by E6AP in PC are yet to be fully identified. In this study we show that p27, a key cell cycle regulator, is a target of E6AP in PC. Down regulation of E6AP increases p27 expression and enhances its nuclear accumulation in PC. We demonstrate that E6AP regulates p27 expression by inhibiting its transcription in an E2F1-dependent manner. Concomitant knockdown of E6AP and p27 partially restores PC cell growth, supporting the contribution of p27 to the overall effect of E6AP on prostate tumorigenesis. Overall, we unravelled the E6AP-p27 axis as a new promoter of PC, exposing an attractive target for therapy through the restoration of tumor suppression.

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