Summary
Human adenovirus serotype 5 (Ad5) has been widely explored as a gene delivery vector. To achieve highly efficient and specific gene delivery, it is often necessary to re-direct Ad5 tropism. Because the capsid protein fiber plays an essential role in directing Ad5 infection, our laboratory attempted to re-target Ad5 through fiber modification. We have developed two strategies in this regard. One is a bi-specific adaptor protein strategy, in which the adaptor protein is designed to bind both the Ad5 fiber and an alternative cell-surface receptor. Another is genetic modification, in which alternative targeting motifs are genetically incorporated into the fiber knob domain so that the Ad5 vectors can infect cells through the alternative receptors. In this chapter, we will focus on the genetic fiber modification strategy and provide a detailed protocol for generation of fiber-modified Ad5 vectors. A series of techniques/procedures used in our laboratory will be described, which include the generation of fiber-modified Ad5 genome by homologous recombination in a bacterial system, rescuing the modified Ad5 viruses, virus amplification and purification, and virus titration.
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Acknowledgments
This work is supported in part by NIH grants (to D.T.C.) 1P01CA104177-01A2, 1P01HL076540, R01CA083821 and 1R01CA111569-01A1. H.W. is supported by NIH brain SPORE grant P50 CA097247 and Juvenile Diabetes Research Foundation grant 1-2005-71.
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Wu, H., Curiel, D.T. (2008). Fiber-modified Adenoviruses for Targeted Gene Therapy. In: Le Doux, J.M. (eds) Gene Therapy Protocols. Methods in Molecular Biology™, vol 434. Humana Press. https://doi.org/10.1007/978-1-60327-248-3_8
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DOI: https://doi.org/10.1007/978-1-60327-248-3_8
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