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NDRG2 suppresses cell proliferation through down-regulation of AP-1 activity in human colon carcinoma cells

Young Jun Kim1, Sun Young Yoon, Jong-Tae Kim

  • 1Stem Cell Center, Korea Research Institute of Bioscience and Biotechnology, Daejeon 305-333, Republic of Korea. wjkim@kribb.re.kr

International Journal of Cancer
|October 11, 2008
PubMed

Insights

N-myc downstream-regulated gene 2 (NDRG2) acts as a tumor suppressor by inhibiting colon cancer cell growth. NDRG2 regulates cyclin D1 expression via a phosphorylation pathway, leading to cell cycle arrest.

Area of Science:

  • Oncology
  • Molecular Biology
  • Cell Biology

Background:

  • The anti-tumor activity of N-myc downstream-regulated gene 2 (NDRG2) is recognized, but its precise tumor suppressor mechanism remains unclear.
  • Understanding NDRG2's molecular function is crucial for developing targeted cancer therapies.

Purpose of the Study:

  • To elucidate the molecular mechanism by which NDRG2 functions as a tumor suppressor.
  • To investigate the effect of NDRG2 expression on colon carcinoma cell growth and cell cycle regulation.

Main Methods:

  • Established stable SW620 colon carcinoma cell lines expressing wild-type NDRG2 or its mutants.
  • Analyzed the impact of NDRG2 on c-Jun phosphorylation, activator protein-1 (AP-1) activity, and cyclin D1 expression.
  • Utilized NDRG2-siRNA to assess the recovery of cellular functions.

Main Results:

  • Wild-type NDRG2 expression induced growth retardation in SW620 cells by decreasing c-Jun phosphorylation and AP-1 activity.
  • NDRG2 down-regulated cyclin D1 expression, causing G1/S phase cell cycle arrest.
  • NDRG2 mutants lacking C-terminal phosphorylation sites did not affect cyclin D1 or cell growth.

Conclusions:

  • NDRG2 acts as a tumor suppressor by modulating intracellular signals that control cell cycle progression.
  • The regulation of cyclin D1 expression through a phosphorylation pathway is a key mechanism for NDRG2's tumor-suppressive function.
  • NDRG2's tumor suppressor activity is dependent on its C-terminal phosphorylation sites.

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