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PACT is requisite for prostate cancer cell proliferation.

Dianne J Beveridge1, Andrew J Woo1,2, Kirsty L Richardson1

  • 1Laboratory for Cancer Medicine, Harry Perkins Institute of Medical Research, and Centre for Medical Research, The University of Western Australia, Crawley, WA, 6009, Australia.

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|October 21, 2025
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PACT protein promotes prostate cancer (PCa) cell proliferation. Depleting PACT reduces PCa cell growth and may offer a new therapeutic strategy for prostate cancer treatment.

Keywords:
Cell-cyclePACTPSAProliferationProstate cancer

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Area of Science:

  • Molecular Biology
  • Cancer Research
  • Virology

Background:

  • PACT (PRKRA gene) is an RNA-binding protein involved in antiviral defense and nuclear receptor gene regulation.
  • Previous work identified PACT's role in modulating nuclear receptor-regulated gene expression.

Purpose of the Study:

  • To investigate the role of PACT in prostate cancer (PCa) pathogenesis.
  • To explore PACT as a potential therapeutic target in PCa.

Main Methods:

  • Loss-of-function studies using PACT depletion in PCa cell lines.
  • RNA-sequencing analysis to identify PACT-regulated genes and pathways.
  • siRNA-mediated knockdown of specific genes and assessment of cell proliferation.
  • Analysis of androgen receptor (AR) signaling and PSA gene expression.

Main Results:

  • PACT depletion reduced PCa cell proliferation but maintained viability.
  • RNA-seq revealed downregulation of cell cycle, mitochondrial function, and NR-response pathways in PACT knockout cells.
  • Downregulated genes, including KLK3 (PSA), upon PACT depletion also reduced cell growth.
  • PACT or PSA reduction induced G0/G1 cell cycle arrest.
  • PACT knockout cells showed altered PSA gene expression in response to hormonal stimuli and AR antagonists.

Conclusions:

  • PACT plays a pro-proliferative role in prostate cancer.
  • Therapeutic strategies targeting PACT or PACT-downregulated genes (like PSA) show promise for PCa treatment.