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Ribonucleotide reductase small subunit p53R2 suppresses MEK-ERK activity by binding to ERK kinase 2

C Piao1, M Jin, H B Kim

  • 1DNA Repair Research Center, Chosun University, Seosuk-dong, Gwangju, South Korea.

Oncogene
|April 29, 2009
PubMed

Insights

The p53R2 protein suppresses cancer cell invasion by negatively regulating the MEK-ERK signaling pathway. This interaction is crucial for controlling the malignancy potential of human cancer cells.

Area of Science:

  • Molecular Biology
  • Cancer Research
  • Cell Signaling

Background:

  • The p53R2 protein is involved in DNA repair and has been implicated in suppressing human cancer cell invasiveness.
  • The precise cellular mechanisms by which p53R2 regulates cancer cell invasiveness are not fully understood.

Purpose of the Study:

  • To elucidate the cellular mechanism by which p53R2 suppresses the invasive potential of human cancer cells.
  • To investigate the interaction between p53R2 and components of the Ras-Raf-MAPK signaling pathway.

Main Methods:

  • Co-immunoprecipitation and immunofluorescence assays to detect physical interactions between p53R2 and MEK2.
  • Utilizing small-interfering RNA (siRNA) to knockdown p53R2 expression and overexpression of p53R2 in human cancer cells.
  • Analyzing the phosphorylation status of MEK1/2 and ERK1/2.
  • Assessing invasive ability and anchorage-independent growth of lung cancer cells.

Main Results:

  • p53R2 physically interacts with MEK2, a key component of the Ras-Raf-MAPK pathway, with amino acids 161-206 of p53R2 being critical for this interaction.
  • Knockdown of p53R2 expression enhanced MEK1/2 and ERK1/2 phosphorylation, increasing invasive ability and anchorage-independent growth of H1299 lung cancer cells.
  • Overexpression of p53R2 attenuated MEK1/2 and ERK1/2 phosphorylation, suggesting a negative regulatory role.

Conclusions:

  • p53R2 negatively modulates serum-induced MEK-ERK activity.
  • p53R2 inhibits the malignancy potential of human cancer cells by suppressing the MEK-ERK signaling pathway.

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