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2003:
Pilgrim S; Stritzker J; Schoen C; Kolb-Mäurer A; Geginat G; Loessner M J; Gentschev I; Goebel W
Bactofection of mammalian cells by Listeria monocytogenes: improvement and mechanism of DNA delivery.
Gene therapy 2003;
10(
24):.
Bacteria-mediated transfer of plasmid DNA into mammalian cells (bactofection) is a potent approach to express plasmid-encoded heterologous proteins (protein antigens, toxins or enzymes) in a large set of different cell types including phagocytic and nonphagocytic mammalian cells. Previously, we have described a Listeria monocytogenes-mediated DNA delivery system, which releases plasmid DNA directly into the cytosol of mammalian cells by partial self-destruction of the carrier bacteria. Here we report on a second generation of this phage lysin supported bactofection system, which is greatly improved with respect to plasmid stability, transfer efficacy and biosafety. In this case, DNA release is initiated by spontaneous bacterial lysis in the infected cells cytosol which is subsequently enhanced by the simultaneously released phage lysin produced by the intracellular carrier bacteria. Bacteria that are capable of cell-to-cell spread are found to be much more efficient in bactofection than their non spreading counterparts.
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