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Modulation of CDK2-AP1 (p12(DOC-1)) expression in human colorectal cancer

Ziquan Yuan1, Anu G Gaba, Tara Sotsky Kent

  • 1Department of Molecular Genetics, Albert Einstein College of Medicine, 1300 Morris Park Avenue, Ullmann 707, New York, NY 10461, USA.

Oncogene
|April 5, 2005
PubMed

Insights

Microsatellite instability in colorectal cancer (CRC) is linked to mutations in the CDK2-AP1 gene, reducing its expression. Restoring CDK2-AP1 levels impacts CRC cell proliferation and apoptosis.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Microsatellite instability (MSI) is a hallmark of certain colorectal cancers (CRC).
  • Decreased expression of CDK2-AP1 (p12(DOC-1)) is observed in MSI CRC.
  • CDK2-AP1 modulates cell cycle arrest and apoptosis.

Purpose of the Study:

  • Investigate mechanisms of reduced CDK2-AP1 expression in MSI CRC.
  • Further elucidate the role of CDK2-AP1 in CRC cell proliferation and apoptosis using RNA interference (RNAi).

Main Methods:

  • Screened 24 CRC cell lines for mutations in the 3' poly (T)8 region of the CDK2-AP1 gene using direct sequencing.
  • Utilized an in vitro human mismatch repair (MMR) system to assess mutation correction and CDK2-AP1 expression changes after hMLH1 transfection.
  • Modulated CDK2-AP1 expression via RNAi and overexpression in various CRC cell contexts.

Main Results:

  • A del T poly (T)8 mutation in the CDK2-AP1 gene was identified in 25% of MSI CRC cell lines but not in microsatellite-stable (MSS) lines.
  • Induction of wild-type MLH1 in an in vitro system reversed the del T mutation and increased CDK2-AP1 expression.
  • RNAi-mediated CDK2-AP1 inhibition led to decreased apoptosis and increased proliferation in CRC cells lacking endogenous CDK2-AP1 deficiency.

Conclusions:

  • Mutations in the CDK2-AP1 microsatellite-like sequence contribute to reduced CDK2-AP1 expression in MSI CRC.
  • Modulating CDK2-AP1 expression significantly affects cell proliferation and apoptosis in human colorectal cancer.

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