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PCI-enhanced adenoviral transduction employs the known uptake mechanism of adenoviral particles

Cancer Gene Therapy volume 12, pages 439–448 (2005)Cite this article

Abstract

The development of methods for efficient and specific delivery of therapeutic genes into target tissues is an important issue for further development of in vivo gene therapy. In the present study, the physical targeting technique, photochemical internalization (PCI), has been used together with adenovirus. The combination of PCI and adenoviral transduction has previously been shown to be favorable compared to adenovirus used alone, and the aim of this study was to verify the role of the adenoviral receptors and identify the uptake pathway used by adenoviral particles in photochemically treated cells. All examined cell lines showed augmented transduction efficiency after PCI-treatment, with a maximum of 13-fold increase in transgene expression compared to conventionally infected cells. Blocking of CAR induced a complete inhibition of PCI-enhanced transgene expression. However, photochemical treatment managed to enhance the transduction efficiency of the retargeted virus AdRGD-GFP showing also that the virus-CAR interaction is not vital for obtaining a photochemical effect on adenoviral transduction. Blocking the αV-integrins reduced the gene expression significantly in photochemically treated cells. Subjecting HeLa cells expressing negative mutant-dynamin to light treatment after infection gave no significant increase in gene transfer, while the gene transfer were enhanced seven-fold in cells with wild-type dynamin. Furthermore, chlorpromazine inhibited photochemical transduction in a dose-dependent manner, whereas Filipin III had no effect on the gene transfer. In summary, the data presented imply that adenoviral receptor binding is important and clathrin-mediated endocytosis is the predominant uptake mechanism for adenoviral particles in photochemically treated cells.

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Acknowledgements

We are grateful to Frank L Graham (McMaster University, Canada) for providing the AdhCMV-lacZ, to Jeffery M Bergelson (Children's Hospital of Philadelphia, USA) for giving us the monoclonal antibody against CAR (RmcB) and to Ian Kirby (Kings College, UK) for supplying recombinant Ad5 fiber-knob. This work was supported by The Norwegian Radium Hospital, The Norwegian Cancer Society and the Gene Therapy Funding from the Norwegian Ministry of Health.

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Authors and Affiliations

  1. Department of Tumor Biology, The Norwegian Radium Hospital, Montebello, N-0310, Oslo, Norway

    Birgit Ø Engesæter, Olav Engebråten, Øystein Fodstad & Gunhild M Mælandsmo

  2. Department of Radiation Biology, The Norwegian Radium Hospital, Montebello, N-0310, Oslo, Norway

    Anette Bonsted & Kristian Berg

  3. PCI Biotech AS, Hoffsvn.48, N-0377, Oslo, Norway

    Anders Høgset

  4. Division of Human Gene Therapy, Departments of Medicine, Pathology and Surgery, and The Gene Therapy Center, University of Alabama at Birmingham, Alabama, USA

    David T Curiel

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  1. Birgit Ø Engesæter
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Correspondence to Birgit Ø Engesæter.

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Engesæter, B., Bonsted, A., Berg, K. et al. PCI-enhanced adenoviral transduction employs the known uptake mechanism of adenoviral particles. Cancer Gene Ther 12, 439–448 (2005). https://doi.org/10.1038/sj.cgt.7700808

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