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Updated: Jun 15, 2026

Growth, Purification, and Titration of Oncolytic Herpes Simplex Virus
06:14

Growth, Purification, and Titration of Oncolytic Herpes Simplex Virus

Published on: May 13, 2021

Transcriptional and translational dual-regulated oncolytic herpes simplex virus type 1 for targeting prostate tumors

Cleo Y F Lee1, Luke X X Bu, Arrigo DeBenedetti

  • 1The Prostate Centre at Vancouver General Hospital, Vancouver, British Columbia, Canada.

Molecular Therapy : the Journal of the American Society of Gene Therapy
|February 25, 2010
PubMed

Insights

This study developed a novel oncolytic herpes simplex virus (HSV-1) for prostate cancer. Dual transcriptional and translational regulation enhanced tumor specificity and viral replication, reducing tumor size by over 85% in mice.

Area of Science:

  • Oncolytic virotherapy
  • Gene expression regulation
  • Prostate cancer therapeutics

Background:

  • Oncolytic herpes simplex virus type 1 (HSV-1) offers potential for cancer treatment.
  • Achieving tumor-specific replication while maintaining high viral lytic activity is a key challenge.
  • Targeting essential viral genes like ICP27 is crucial for controlling viral replication.

Purpose of the Study:

  • To engineer an HSV-1 with dual transcriptional and translational regulation of the ICP27 gene.
  • To enhance tissue- and tumor-specific replication of the oncolytic virus.
  • To evaluate the efficacy and safety of the engineered virus in prostate cancer models.

Main Methods:

  • Generated recombinant viruses (A27 and AU27) with a prostate-specific promoter (ARR(2)PB) and 5'UTRs of rFGF-2 regulating ICP27.
  • Tested viral efficacy and toxicity in vitro and in vivo using prostate cancer cell lines and xenograft models.
  • Quantified viral replication and DNA presence in tumors and normal organs using real-time PCR.

Main Results:

  • The ARR(2)PB promoter increased ICP27 expression and viral replication in prostate cells.
  • 5'UTR-mediated translational regulation effectively constrained viral replication.
  • Mice treated with AU27 showed >85% tumor size reduction, with viral replication confined to tumors.

Conclusions:

  • Transcriptional and translational dual-regulated (TTDR) essential gene expression enhances oncolytic virus lytic activity and tumor specificity.
  • This strategy provides a foundation for developing novel, systemically administered oncolytic viruses for prostate cancer.
  • The engineered virus demonstrates potential for treating locally advanced and metastatic prostate cancers.

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