Abstract
Fully deleted adenovirus vectors (FD-AdVs) would appear to be promising tools for gene therapy. Since these vectors are deleted of all adenoviral genes, they require a helper adenovirus for their propagation. The contamination of the vector preparation by the helper limits the utility of currently existing FD-AdVs in gene therapy applications. We have developed an alternative system for the propagation of FD-AdVs, in which the adenoviral genes essential for replication and packaging of the vector are delivered into producer cells by a baculovirus–adenovirus hybrid. A hybrid baculovirus Bac-B4 was constructed to carry a Cre recombinase-excisable copy of the packaging-deficient adenovirus genome. Although the total size of the DNA insert in Bac-B4 was 38 kb, the genetic structure of this recombinant baculovirus was stable. Bac-B4 gave high yields in Sf9 insect cells, with titers of 5 × 108p.f.u./ml before concentration. Transfection of 293-Cre cells with lacZ-expressing FD-AdV plasmid DNA followed by infection by Bac-B4 at a MOI of 2000 p.f.u./ml resulted in rescue of the helper-free vector. Subsequent passaging of the obtained FD-AdV using Bac-B4 as a helper resulted in ∼100-fold increases of the vector titer at each passage. This resulting vector was completely free of helper virus and was able to transduce cultured 293 cells. However, scaling-up of FD-AdV production was prevented by the eventual emergence of replication-competent adenovirus (RCA). Experiments are underway to optimize this system for the large-scale production of helper virus-free FD-AdVs and to minimize the possibility of generation of replication-competent adenovirus (RCA) during vector production. This baculovirus-based system will be a very useful alternative to current methods for the production of FD-AdVs.
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This work was supported by NIH grants DK51700 to RCE and DK5333 to VAK.
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Cheshenko, N., Krougliak, N., Eisensmith, R. et al. A novel system for the production of fully deleted adenovirus vectors that does not require helper adenovirus. Gene Ther 8, 846–854 (2001). https://doi.org/10.1038/sj.gt.3301459
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DOI: https://doi.org/10.1038/sj.gt.3301459
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