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PPIP5K2 promotes colorectal carcinoma pathogenesis through facilitating DNA homologous recombination repair

Chen-Hui Cao1, Han Ling1, Kai Han1,2

  • 1Sun Yat-sen University Cancer Center, State Key Laboratory of Oncology in South China, Collaborative Innovation Center for Cancer Medicine, Guangzhou, 510060, China.

Oncogene
|October 14, 2021
PubMed

Insights

Diphosphoinositol pentakisphosphate kinase 2 (PPIP5K2) promotes colorectal cancer (CRC) survival by enhancing DNA repair. Targeting PPIP5K2, particularly its S1006 dephosphorylation, offers a potential therapeutic strategy for CRC patients.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cancer Genetics

Background:

  • Colorectal carcinoma (CRC) is a leading cause of cancer mortality globally.
  • Targeting DNA repair defects is a promising therapeutic avenue in oncology, yet underexplored in CRC.
  • The role of Diphosphoinositol Pentakisphosphate Kinase 2 (PPIP5K2) in CRC remains largely unknown.

Purpose of the Study:

  • To investigate the role and mechanism of PPIP5K2 in colorectal cancer progression.
  • To determine the association between PPIP5K2 expression and patient prognosis.
  • To explore PPIP5K2 as a potential therapeutic target in CRC.

Main Methods:

  • In vitro and in vivo functional assays to assess PPIP5K2's impact on CRC cell proliferation and migration.
  • Analysis of PPIP5K2 subcellular localization and its regulation by S1006 phosphorylation.
  • Investigation of PPIP5K2's role in DNA damage response, specifically homologous recombination (HR) repair, using DNA damage treatments (doxorubicin, irradiation).
  • Assessment of PPIP5K2's interaction with DNA repair proteins like RPA70.

Main Results:

  • PPIP5K2 is highly expressed in CRC and correlates with poor patient prognosis.
  • PPIP5K2 enhances CRC cell proliferation and migration independently of its kinase activity.
  • S1006 dephosphorylation of PPIP5K2 promotes its nuclear translocation.
  • Nuclear PPIP5K2 acts as a scaffold protein, facilitating HR repair by recruiting RPA70 to DNA damage sites.
  • DNA damage induces PPIP5K2 nuclear translocation and enhances DNA repair capacity.

Conclusions:

  • PPIP5K2 plays a critical role in enhancing colorectal cancer cell survival through the facilitation of DNA homologous recombination repair.
  • PPIP5K2's function is modulated by S1006 phosphorylation, influencing its nuclear localization and DNA repair activity.
  • PPIP5K2 represents a novel therapeutic target for colorectal cancer, with its S1006 phosphorylation status being a key factor.

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