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Related Experiment Video

Updated: Mar 2, 2026

Sequencing Small Non-coding RNA from Formalin-fixed Tissues and Serum-derived Exosomes from Castration-resistant Prostate Cancer Patients
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E6AP promotes prostate cancer by reducing p27 expression.

Dinesh Raghu1,2, Piotr Jan Paul1,2, Twishi Gulati1,2

  • 1The Sir Peter MacCallum Department of Oncology, The University of Melbourne, Melbourne, Victoria, Australia.

Oncotarget
|May 7, 2017
PubMed
Summary
This summary is machine-generated.

Elevated E6-Associated Protein (E6AP) promotes prostate cancer (PC) by degrading the tumor suppressor p27. Inhibiting E6AP restores p27 levels, offering a new therapeutic strategy for PC.

Keywords:
E2F1E6APp27prostate cancertumor suppression

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Area of Science:

  • Oncology
  • Molecular Biology
  • Biochemistry

Background:

  • Prostate cancer (PC) is a leading cancer in men, with elevated E3 ligase E6-Associated Protein (E6AP) implicated in its progression.
  • Dysregulated E3 ligase activity in cancer promotes the degradation of tumor suppressor proteins, highlighting E3 ligase inhibitors as a therapeutic avenue.
  • Identifying specific tumor suppressors targeted by E6AP in PC is crucial for developing targeted therapies.

Purpose of the Study:

  • To identify key tumor suppressor proteins targeted by E6AP in prostate cancer.
  • To elucidate the regulatory mechanism of E6AP on identified targets.
  • To evaluate the therapeutic potential of targeting the E6AP-tumor suppressor axis in PC.

Main Methods:

  • Western blotting to assess protein levels of E6AP and p27.
  • Quantitative real-time PCR (qRT-PCR) to measure gene transcription.
  • Immunofluorescence microscopy for nuclear accumulation studies.
  • Cell proliferation assays following gene knockdown.

Main Results:

  • p27, a critical cell cycle regulator, was identified as a direct target of E6AP in PC.
  • Downregulation of E6AP led to increased p27 expression and enhanced nuclear accumulation in PC cells.
  • E6AP was shown to inhibit p27 transcription in an E2F1-dependent manner.
  • Simultaneous knockdown of E6AP and p27 partially reversed PC cell growth, confirming p27's role.

Conclusions:

  • The E6AP-p27 signaling axis is a novel promoter of prostate tumorigenesis.
  • Targeting E6AP to restore p27 tumor suppressor function presents a promising therapeutic strategy for PC.
  • Further research into the E6AP-p27 interaction could lead to the development of effective PC treatments.