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Heat-directed gene targeting of adenoviral vectors to tumor cells

A M Brade1, D Ngo, P Szmitko

  • 1Department of Medical Biophysics, University of Toronto, Ontario, Canada.

Cancer Gene Therapy
|March 3, 2001
PubMed

Insights

This study developed a heat-directed gene therapy for cancer using modified heat shock promoters. Enhanced heat responsiveness in tumor cells and xenografts shows promise for clinical hyperthermia.

Area of Science:

  • Oncology
  • Molecular Biology
  • Gene Therapy

Background:

  • Targeting gene expression to tumor cells is crucial for effective cancer gene therapy.
  • Heat shock genes exhibit strong transcriptional responses, and hyperthermia offers therapeutic benefits.
  • Heat shock factor 1 (HSF1) binding to heat shock elements (HSE) in promoters regulates heat-inducible genes.

Purpose of the Study:

  • To develop and analyze a heat-directed gene-targeting strategy for cancer treatment.
  • To quantitatively analyze heat-inducible gene expression using wild-type and modified hsp70b promoters.
  • To assess the efficacy of heat-inducible gene expression in cancer cell lines and in vivo tumor models.

Main Methods:

  • Quantitative analysis of beta-galactosidase (beta-gal) expression mediated by wild-type and modified hsp70b gene promoters.
  • Utilized adenoviral vectors (Ad.70b.betag and Ad.HSE.70b.betag) for gene delivery in human breast cancer cell lines.
  • Investigated gene expression under hyperthermic conditions (43°C for 30 minutes) and in a HeLa cell xenograft model.

Main Results:

  • Infection with Ad.70b.betag resulted in 50- to 800-fold induction of beta-gal expression.
  • Infection with Ad.HSE.70b.betag yielded a 200- to 950-fold increase in beta-gal expression, with a 1-2°C lower activation threshold.
  • The modified promoter (Ad.HSE.70b.betag) showed enhanced heat responsiveness in five of six tumor cell lines and under thermotolerant conditions.
  • Localized heating of a HeLa cell xenograft effectively targeted beta-gal gene expression after intratumoral injection of Ad.70b.betag.

Conclusions:

  • Modified hsp70b promoters with additional HSE sequences enhance heat-inducible gene expression.
  • This heat-directed gene-targeting strategy shows potential for improved cancer treatment.
  • Adenoviral vectors with heat-inducible genes may serve as valuable adjuncts in clinical hyperthermia treatments.

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