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p53-dependent G2 arrest associated with a decrease in cyclins A2 and B1 levels in a human carcinoma cell line.

C Badie1, J Bourhis, J Sobczak-Thépot

  • 1Laboratoire de Pharmacotoxicologie et Pharmacogénétique UMR8532, Institut Gustave-Roussy, Villejuif, France.

British Journal of Cancer
|February 22, 2000
PubMed
Summary
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Adenoviral transfer of wild-type p53 (wt p53) gene into head and neck cancer cells induced a G1 cell cycle arrest. Combining wt p53 gene transfer with irradiation caused a permanent G2 arrest, enhancing cancer treatment potential.

Area of Science:

  • Oncology
  • Molecular Biology
  • Genetics

Background:

  • Wild-type p53 (wt p53) gene transfer via adenovirus shows promise in cancer therapy by inducing apoptosis and radiosensitivity.
  • Head and neck squamous cell carcinoma (SCC) often harbors p53 mutations, impacting treatment efficacy.

Purpose of the Study:

  • To investigate the effects of adenoviral-mediated wt p53 gene transfer on cell cycle progression and radiosensitivity in a p53-mutated human head and neck squamous cell carcinoma cell line (SCC97).
  • To explore the potential of combining p53 gene therapy with irradiation for enhanced anti-cancer effects.

Main Methods:

  • Adenoviral-mediated transfer of the wt p53 gene into SCC97 cells.
  • Cell cycle analysis (G1 and G2 arrest) following gene transfer and/or irradiation.

Related Experiment Videos

  • Quantification of WAF1/p21, cyclin A2, and cyclin B1 expression levels.

    • Main Results:

    • Ectopic expression of wt p53 in SCC97 cells led to a prolonged G1 arrest and increased WAF1/p21 expression.
    • Irradiation alone caused a transient G2 arrest.
    • Simultaneous wt p53 gene transfer and irradiation resulted in a permanent G2 arrest, decreased cyclin A2 and B1 levels, suggesting premature inactivation of the mitosis promoting factor.

    Conclusions:

    • Adenoviral-mediated wt p53 gene transfer in p53-mutated SCC97 cells increases WAF1/p21 expression and induces a permanent G2 arrest when combined with irradiation.
    • This combination therapy potentially enhances radiosensitivity by disrupting the G2/M transition through p53-dependent mechanisms.