Abstract
Non-human adenovirus vectors have attractive immunological properties for gene therapy but are frequently restricted by inefficient transduction of human target cells. Using chicken embryo lethal orphan (CELO) virus, we employed a nongenetic mechanism of polymer coating and retargeting with basic fibroblast growth factor (bFGF-pc-CELOluc), a strategy that permits efficient tropism modification of human adenovirus. bFGF-pc-CELOluc showed efficient uptake and transgene expression in chick embryo fibroblasts (CEF), and increased levels of binding and internalization in a variety of human cell lines. Transgene expression was also greater than unmodified CELOluc in PC-3 human prostate cells, although the specific activity (RLU per internalized viral genome) was decreased. In CEF, the specific activity of bFGF-pc-CELOluc was considerably higher than in the human prostate cell line PC-3. Retargeted virus was fully resistant to inhibition by human serum with known adenovirus-neutralizing activity in vitro, while in mice CELOluc was cleared less rapidly from the blood than Adluc following i.v. administration in the presence of adenovirus neutralizing serum. Polymer coating and retargeting with bFGF further reduced rates of clearance for both viruses, suggesting protection against both neutralizing and opsonizing factors. The data indicate that CELO virus may be retargeted to infect human cells via alternative, potentially disease-specific, receptors and resist the effects of pre-existing humoral immunity.
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Acknowledgements
We specially thank Sue Phipps, Elizabeth Hodgkins, Oliver Hayward and Sarah Hale for assistance with Ad5 production. We are especially grateful to Norman Maitland for supplying the PNT1a and PNT-2 prostate cell lines and for Matt Cotten for the CELO virus (AIM 46). Funding from the European Union framework V research grant supported this work.
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Stevenson, M., Boos, E., Herbert, C. et al. Chick embryo lethal orphan virus can be polymer-coated and retargeted to infect mammalian cells. Gene Ther 13, 356–368 (2006). https://doi.org/10.1038/sj.gt.3302655
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DOI: https://doi.org/10.1038/sj.gt.3302655
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