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DNA damage-induced cell cycle checkpoints involve both p53-dependent and -independent pathways: role of telomere

S Narayan1, A S Jaiswal, A S Multani

  • 1UF Shands Cancer Center and Anatomy and Cell Biology, College of Medicine, University of Florida, Gainesville, FL 32610, USA.

British Journal of Cancer
|September 15, 2001
PubMed

Insights

N-methyl-N-nitro-N-nitrosoguanidine (MNNG) treatment damages colon cancer cell DNA and reduces telomeres via p53. MNNG also triggers cell cycle arrest and apoptosis, with TRF2 levels potentially influencing these outcomes.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Colon cancer is a significant global health concern.
  • Understanding DNA damage response pathways is crucial for cancer therapy.
  • Telomeres and p53 are key regulators of genomic stability and cell fate.

Purpose of the Study:

  • To investigate the effects of MNNG on colon cancer cells.
  • To elucidate the role of p53 and TRF2 in MNNG-induced DNA damage and cell cycle arrest.

Main Methods:

  • Treatment of colon cancer cells with MNNG.
  • Analysis of DNA damage, telomeric signals, and cell cycle progression.
  • Assessment of p53 and TRF2 protein levels.

Main Results:

  • MNNG induced DNA damage and reduced telomeric signals in a p53-dependent manner.
  • Cell cycle arrest in S-G(2)/M phases occurred through both p53-dependent and independent pathways.
  • Cellular TRF2 levels were implicated in MNNG-induced cell cycle arrest and apoptosis.

Conclusions:

  • MNNG elicits complex DNA damage responses in colon cancer cells.
  • Both p53-dependent and independent mechanisms contribute to MNNG-induced cell cycle arrest.
  • TRF2 is a potential key player in MNNG-mediated apoptosis and cell cycle regulation in colon cancer.

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