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Targeting PRPK Function Blocks Colon Cancer Metastasis.

Tatyana Zykova1, Feng Zhu1, Lei Wang1

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Area of Science:

  • Oncology
  • Molecular Biology
  • Biochemistry

Background:

  • The biological roles of p53-related protein kinase (PRPK) are not fully understood.
  • Previously, PRPK was shown to be phosphorylated by TOPK, and this phosphorylated form (p-PRPK) enhances colon cancer metastasis.

Purpose of the Study:

  • To investigate the role of PRPK in colon cancer progression and metastasis.
  • To identify PRPK's molecular targets and potential therapeutic inhibitors.

Main Methods:

  • Analysis of p-PRPK expression in 87 human colon adenocarcinoma samples.
  • In vivo studies involving knockdown of PRPK in colon cancer cells.
  • In vitro kinase assays to identify PRPK substrates.
  • Evaluation of fusidic acid (FA) and 5-fluorouracil (5-FU) combination therapy in mouse models.

Main Results:

  • Higher p-PRPK levels correlated with advanced metastatic stages (III/IV) and increased metastasis in human colon adenocarcinomas.
  • PRPK knockdown reduced liver and lung metastasis in vivo.
  • PRPK directly phosphorylates survivin at Thr34, enhancing its stability and promoting colon cancer metastasis.
  • Fusidic acid (FA) was identified as a PRPK inhibitor; combined FA and 5-FU treatment suppressed PRPK activity and lung metastasis in mice.

Conclusions:

  • The PRPK signaling pathway promotes colon cancer metastasis by regulating survivin stability.
  • PRPK serves as a potential prognostic marker for colon cancer patient survival.
  • Combination therapy with FA and 5-FU presents a promising alternative treatment strategy for advanced colon cancer.