A novel Listeria monocytogenes-based DNA delivery system for cancer gene therapy.
Authorsvan Pijkeren, Jan Peter
Monk, Ian R
O'Sullivan, Gerald C
Gahan, Cormac G M
AffiliationCork Cancer Research Centre, Mercy University Hospital and Leslie C. Quick Jnr., Laboratory, University College Cork, Cork, Ireland.
Cell Line, Tumor
*Gene Transfer Techniques
Genetic Vectors/*administration & dosage/genetics/metabolism
Mice, Inbred BALB C
MetadataShow full item record
CitationHum Gene Ther. 2010 Apr;21(4):405-16.
JournalHuman gene therapy
AbstractBacteria-mediated transfer of plasmid DNA to mammalian cells (bactofection) has been shown to have significant potential as an approach to express heterologous proteins in various cell types. This is achieved through entry of the entire bacterium into cells, followed by release of plasmid DNA. In a murine model, we show that Listeria monocytogenes can invade and spread in tumors, and establish the use of Listeria to deliver genes to tumors in vivo. A novel approach to vector lysis and release of plasmid DNA through antibiotic administration was developed. Ampicillin administration facilitated both plasmid transfer and safety control of vector. To further improve on the gene delivery system, we selected a Listeria monocytogenes derivative that is more sensitive to ampicillin, and less pathogenic than the wild-type strain. Incorporation of a eukaryotic-transcribed lysin cassette in the plasmid further increased bacterial lysis. Successful gene delivery of firefly luciferase to growing tumors in murine models and to patient breast tumor samples ex vivo was achieved. The model described encompasses a three-phase treatment regimen, involving (1) intratumoral administration of vector followed by a period of vector spread, (2) systemic ampicillin administration to induce vector lysis and plasmid transfer, and (3) systemic administration of combined moxifloxacin and ampicillin to eliminate systemic vector. For the first time, our results reveal the potential of Listeria monocytogenes for in vivo gene delivery.
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