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Evaluation of Substrate Ubiquitylation by E3 Ubiquitin-ligase in Mammalian Cell Lysates
09:47

Evaluation of Substrate Ubiquitylation by E3 Ubiquitin-ligase in Mammalian Cell Lysates

Published on: May 10, 2022

Ubiquitin E3 ligase WWP1 as an oncogenic factor in human prostate cancer

C Chen1, X Sun, P Guo

  • 1Winship Cancer Institute and Department of Hematology and Oncology, Emory University School of Medicine, Atlanta, GA 30322, USA.

Oncogene
|October 4, 2006
PubMed

Insights

The E3 ubiquitin ligase WWP1 gene amplification and overexpression are common in prostate cancer, promoting tumor growth by inactivating the TGF-beta tumor suppressor pathway. This study provides evidence for WWP1 acting as an oncogene in human prostate cancer.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cancer Genetics

Background:

  • The WWP1 gene, encoding an E3 ubiquitin ligase, is located in the 8q21 region, frequently amplified in human cancers.
  • WWP1 negatively regulates the TGF-beta tumor suppressor pathway, suggesting a potential oncogenic role in carcinogenesis.

Purpose of the Study:

  • To investigate the role of WWP1 in human prostate cancer by examining gene dosage, mRNA expression, mutation status, and functional impact.
  • To provide direct evidence for WWP1's oncogenic function in prostate cancer development and progression.

Main Methods:

  • Analysis of WWP1 gene copy number, mRNA expression, and mutations in prostate cancer cell lines, xenografts, and clinical samples.
  • Functional studies including colony formation assays and cell proliferation assays following WWP1 manipulation (overexpression and knockdown).

Main Results:

  • WWP1 gene copy number gain was observed in 44% of prostate cancer xenografts/cell lines and 31% of clinical samples.
  • WWP1 was overexpressed in 60% of prostate cancer xenografts/cell lines.
  • WWP1 overexpression promoted colony formation, while WWP1 knockdown suppressed proliferation and enhanced TGF-beta-mediated growth inhibition in prostate cancer cells.

Conclusions:

  • WWP1 acts as an oncogene in human prostate cancer, frequently undergoing genomic amplification at 8q21.
  • WWP1 overexpression is a common mechanism contributing to the inactivation of the TGF-beta tumor suppressor pathway in prostate cancer.

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