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<p>PACT (encoded by the <i>PRKRA</i> gene) is a double-stranded RNA binding protein with defined antiviral defense and cytoplasmic RNA-induced silencing actions in mammals. We previously described a further role for PACT as a modulator of nuclear receptor (NR)-regulated gene expression. Here, we investigated the role of PACT in prostate cancer (PCa) using a loss-of-function approach. Depletion of PACT in multiple PCa cell lines resulted in a reduction in cell proliferation, but viability was maintained. RNA-sequencing analysis of LNCaP PCa cells ± PACT revealed a depletion of biological processes involved in cell cycle, mitochondrial function, and NR-response pathways in the PACT knockout (KO) cells. In the PACT KO cells, downregulated genes included the androgen-regulated <i>KLK3</i> (prostate specific antigen, PSA), together with <i>H2AFJ, PSMD5, AQP3, TMEM45B</i>, and <i>SLC22A3,</i> and siRNA-mediated knockdown of these genes reduced cell growth and proliferation in LNCaP cells. Further, reducing PACT or PSA induced cell cycle arrest at G0/G1. Additionally, the hormone-mediated upregulation and AR antagonist-driven downregulation of PSA gene expression were respectively attenuated and enhanced in PACT KO cells. Taken together, these data support a pro-proliferative role for PACT in PCa, and siRNA therapeutic targeting of PACT, or downregulated genes with PACT KO, could represent a new therapeutic approach.</p>

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PACT is requisite for prostate cancer cell proliferation

  • 期刊论文

  • 出版模式：

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  • 发表日期：

    2025年10月21日

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  • Dianne J. Beveridge,
  • Andrew J. Woo,
  • Kirsty L. Richardson,
  • Rikki A. M. Brown,
  • Lisa M. Stuart,
  • Manjot Singh,
  • Andrew D. Redfern,
  • Peter J. Leedman

摘要

PACT (encoded by the PRKRA gene) is a double-stranded RNA binding protein with defined antiviral defense and cytoplasmic RNA-induced silencing actions in mammals. We previously described a further role for PACT as a modulator of nuclear receptor (NR)-regulated gene expression. Here, we investigated the role of PACT in prostate cancer (PCa) using a loss-of-function approach. Depletion of PACT in multiple PCa cell lines resulted in a reduction in cell proliferation, but viability was maintained. RNA-sequencing analysis of LNCaP PCa cells ± PACT revealed a depletion of biological processes involved in cell cycle, mitochondrial function, and NR-response pathways in the PACT knockout (KO) cells. In the PACT KO cells, downregulated genes included the androgen-regulated KLK3 (prostate specific antigen, PSA), together with H2AFJ, PSMD5, AQP3, TMEM45B, and SLC22A3, and siRNA-mediated knockdown of these genes reduced cell growth and proliferation in LNCaP cells. Further, reducing PACT or PSA induced cell cycle arrest at G0/G1. Additionally, the hormone-mediated upregulation and AR antagonist-driven downregulation of PSA gene expression were respectively attenuated and enhanced in PACT KO cells. Taken together, these data support a pro-proliferative role for PACT in PCa, and siRNA therapeutic targeting of PACT, or downregulated genes with PACT KO, could represent a new therapeutic approach.