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Synergistic anti-tumor effects of nitroreductase mutants and p53

Mahboobeh Razmkhah1, Mojtaba Habibagahi, Fatemeh Alizadeh

  • 1Shiraz Institute for Cancer Research, Shiraz University of Medical Sciences, Shiraz, Iran.

Journal of Cancer Research and Therapeutics
|October 15, 2014
PubMed
Abstract

Insights

Combining p53 gene therapy with specific nitroreductase (NTR) mutants, particularly T41L/F70A, significantly enhanced cancer cell death. This combination therapy shows promise for treating various cancers more effectively than p53 or NTR alone.

Area of Science:

  • Oncology
  • Molecular Biology
  • Gene Therapy

Background:

  • p53 gene therapy demonstrates efficacy in cancer treatment, often enhanced by combination with chemotherapy or radiotherapy.
  • Combining gene therapies can yield synergistic effects, offering new avenues for cancer treatment.

Purpose of the Study:

  • To investigate the combined effects of p53 gene therapy and nitroreductase (NTR) suicide gene therapy on various cancer cell lines.
  • To evaluate the efficacy of different NTR mutants in combination with p53.

Main Methods:

  • Adenoviral vectors expressing p53 alone or in combination with wild-type (WT) NTR, single mutant F124N, or double mutants T41L/N71S and T41L/F70A were used.
  • MTT assays determined cell survival rates across A549, QU-DB, MCF-7, MDA-MB-468, and DU145 cell lines.
  • Quantitative real-time PCR assessed MDM2 and TP53 transcript levels post-infection.

Main Results:

  • The combination of p53 with NTR double mutant T41L/F70A or single mutant F124N significantly reduced cancer cell viability compared to p53 or WT NTR alone (P < 0.05).
  • TP53 and MDM2 expressions were downregulated in T41L/F70A-infected cells, except for MCF-7.
  • The T41L/F70A mutant showed superior efficacy across all tested cancer cell lines.

Conclusions:

  • The combination of p53 with the T41L/F70A NTR mutant presents a promising strategy for treating diverse cancers.
  • This enhanced gene therapy approach may offer significant advantages over using p53 or other NTR variants alone.
  • These findings open new possibilities for achieving desired outcomes in cancer gene therapy.

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