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Related Experiment Videos

Cell cycle checkpoint function in bladder cancer.

Sharon C Doherty1, Stephanie R McKeown, Valerie McKelvey-Martin

  • 1Cancer and Ageing Research Group, School of Biomedical Sciences, University of Ulster, Coleraine, Northern Ireland.

Journal of the National Cancer Institute
|December 18, 2003
PubMed
Summary
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Bladder cancer cells show faulty cell cycle checkpoints, particularly the p53-independent decatenation G2 checkpoint. This defect may contribute to genetic instability and tumor development.

Area of Science:

  • Cell Biology
  • Cancer Research
  • Genetics

Background:

  • Cell cycle checkpoints are crucial for maintaining genetic stability by enabling DNA repair and accurate cell division.
  • Some checkpoints, like the G1 checkpoint, rely on p53, while others, like the decatenation G2 checkpoint, are p53-independent.
  • Bladder transitional cell carcinomas (TCCs) exhibit chromosomal instability, prompting an investigation into their cell cycle checkpoint functions.

Purpose of the Study:

  • To analyze cell cycle checkpoint functions in bladder transitional cell carcinoma (TCC) cell lines.
  • To investigate the role of p53-dependent and p53-independent checkpoints in TCCs.
  • To understand the contribution of checkpoint defects to genomic instability in bladder cancer.

Main Methods:

  • Cell cycle arrest was induced in normal human fibroblasts (NHF1-hTERT), normal human uroepithelial cells (HUCs), and TCC lines.

Related Experiment Videos

  • Checkpoint functions were quantified using flow cytometry and fluorescence microscopy.
  • Specific checkpoints analyzed included G1 and G2 checkpoints (DNA damage), polyploidy checkpoint (colcemid), and decatenation G2 checkpoint (ICRF-193).

    • Main Results:

    • Normal human uroepithelial cells demonstrated effective G1 and G2 checkpoint responses to DNA damage and decatenation.
    • Three of five TCC lines showed severely attenuated G1 checkpoint function, while two had moderately attenuated responses.
    • All TCC lines exhibited a severe defect in the p53-independent decatenation G2 checkpoint.
    • Three of five TCC lines were defective in the polyploidy checkpoint.

    Conclusions:

    • Bladder TCC lines possess defective cell cycle checkpoint functions.
    • The p53-independent decatenation G2 checkpoint may collaborate with p53-dependent G1 checkpoints.
    • These cooperating checkpoints likely play a role in preserving chromosomal stability and suppressing bladder carcinogenesis.