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A novel balanced-lethal host-vector system based on glmS.

Kwangsoo Kim1, Jae Ho Jeong, Daejin Lim

  • 1Department of Microbiology, Chonnam National University Medical School, Dong-gu, Gwangju, Republic of Korea.

Plos One
|April 5, 2013
PubMed
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Researchers developed a novel bacterial system to prevent therapeutic plasmid loss in cancer treatment. This balanced-lethal system ensures bacteria maintain essential genes for tumor-targeted therapies.

Area of Science:

  • Microbiology
  • Biotechnology
  • Cancer Therapy

Background:

  • Bacteria like E. coli and S. typhimurium are explored for cancer treatment due to tumor accumulation and engineered therapeutic protein delivery.
  • A key challenge is the loss of plasmids carrying therapeutic genes, as these are not essential for bacterial survival.

Purpose of the Study:

  • To develop a stable, balanced-lethal host-vector system for bacteria used in cancer therapy.
  • To ensure the retention of therapeutic plasmids within bacteria delivered to tumor sites.

Main Methods:

  • Created a balanced-lethal system by deleting the glmS gene in E. coli and S. typhimurium.
  • Utilized the GlmS(-) mutant phenotype, which requires specific nutrients (D-glucosamine or N-acetyl-D-glucosamine) for survival, leading to lysis in their absence.

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  • Complemented GlmS(-) mutants with plasmids containing the glmS gene (GlmS(+)p) to ensure plasmid maintenance.

    • Main Results:

    • GlmS(+)p restored the GlmS(-) mutant's ability to proliferate, ensuring plasmid stability both in vitro and in vivo without selection pressure.
    • Bioluminescent signals from GlmS(+)pLux in tumor-bearing mice were significantly stronger (hundreds-fold) than controls, confirming faithful plasmid maintenance.
    • Demonstrated a correlation between photon flux and bacterial number for in vivo imaging.

    Conclusions:

    • The developed balanced-lethal host-vector system effectively prevents therapeutic plasmid loss in bacteria.
    • This system enables reliable bacterial delivery of therapeutic genes to tumors and allows for accurate quantification of bacteria using in vivo imaging.