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R1 Regulates Prostate Tumor Growth and Progression By Transcriptional Suppression of the E3 Ligase HUWE1 to Stabilize

Tzu-Ping Lin1,2,3,4, Jingjing Li5, Qinlong Li6,7

  • 1Depatment of Pharmacology and Pharmaceutical Sciences, School of Pharmacy, University of Southern California, Los Angeles, California.

Molecular Cancer Research : MCR
|July 26, 2018
PubMed

Insights

Researchers discovered that elevated R1 protein levels in prostate cancer correlate with worse outcomes. R1 (CDCA7L) promotes tumor growth by stabilizing the c-Myc oncoprotein, suggesting R1 as a potential therapeutic target.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cancer Research

Background:

  • Prostate cancer poses a significant global health challenge, necessitating novel therapeutic strategies.
  • Identifying new molecular targets is crucial for improving patient outcomes and quality of life.

Purpose of the Study:

  • To investigate the role of R1 (CDCA7L), a c-Myc-interacting protein, in prostate cancer pathogenesis.
  • To explore R1 as a potential therapeutic and prognostic marker for prostate cancer.

Main Methods:

  • Analysis of R1 expression in human prostate cancer tissues and correlation with clinical data.
  • In vitro studies involving R1 overexpression and knockdown in prostate cancer cell lines.
  • In vivo experiments using prostate tumor xenografts in mice.
  • Mechanistic studies to elucidate R1's effect on c-Myc stability and HUWE1 expression.

Main Results:

  • R1 expression is elevated in prostate cancer tissues and associated with disease recurrence and reduced patient survival.
  • R1 overexpression enhances prostate cancer cell proliferation and colony formation.
  • Silencing R1 significantly inhibits prostate tumor xenograft growth in mice.
  • R1 stabilizes c-Myc by transcriptionally suppressing HUWE1, a c-Myc-targeting E3 ligase.

Conclusions:

  • R1 is a novel regulator of prostate tumor growth, acting by increasing c-Myc protein stability.
  • These findings highlight R1's potential as a therapeutic target and prognostic biomarker in prostate cancer.
  • Further research into R1's therapeutic and prognostic potential is warranted.

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