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p57Kip2 is an unrecognized DNA damage response effector molecule that functions in tumor suppression and

H Jia1, Q Cong1, J F L Chua2

  • 1Bio-X Institutes, Key Laboratory for the Genetics of Developmental and Neuropsychiatric Disorders, Ministry of Education, Shanghai Jiao Tong University, Shanghai, China.

Oncogene
|September 9, 2014
PubMed

Insights

The DNA damage response (DDR) involves p57Kip2, a CDK inhibitor. This molecule suppresses tumor formation and contributes to chemoresistance by inhibiting cell death following DNA damage.

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Cell Cycle Regulation

Background:

  • The DNA damage response (DDR) is crucial for maintaining genomic stability and mediating cancer treatment efficacy.
  • p57Kip2, a cyclin-dependent kinase (CDK) inhibitor, is linked to Beckwith-Wiedemann syndrome, a condition predisposing to tumors.

Purpose of the Study:

  • To investigate the role of p57Kip2 as an effector molecule in the DNA damage response.
  • To elucidate the molecular pathways regulating p57Kip2 expression under genotoxic stress.
  • To determine the function of p57Kip2 in cell cycle regulation, cell death, and tumor suppression.

Main Methods:

  • Investigated p57Kip2 expression induction via BMP-Smad1 and Atm-p38MAPK-Atf2 pathways.
  • Analyzed the role of the Smad1-Atf2 complex in p57Kip2 promoter recruitment.
  • Assessed the impact of elevated p57Kip2 on cell cycle progression and apoptosis.
  • Examined p57Kip2 expression in clinical rectal tumor samples.
  • Evaluated the effect of targeting p57Kip2 on chemoresistance in rectal cancer models.

Main Results:

  • Genotoxic stress induces p57Kip2 expression through specific signaling pathways, requiring the Smad1-Atf2 complex.
  • Elevated p57Kip2 causes G1/S cell cycle arrest but inhibits DNA damage-induced cell death.
  • p57Kip2 functions in parallel with p53 to suppress cell transformation and tumor formation.
  • p57Kip2 is upregulated in early-stage rectal tumors.
  • Inhibition of p57Kip2 increases sensitivity to doxorubicin in rectal cancer cells, indicating a role in chemoresistance.

Conclusions:

  • p57Kip2 is a novel effector of the DNA damage response.
  • p57Kip2 suppresses tumorigenesis through cell cycle arrest and inhibition of apoptosis.
  • p57Kip2 contributes to chemoresistance in rectal cancer, suggesting therapeutic targeting potential.

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