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Recharging cationic DNA complexes with highly charged polyanions for in vitro and in vivo gene delivery

Gene Therapy volume 10, pages 261–271 (2003)Cite this article

Abstract

The intravenous delivery of plasmid DNA complexed with either cationic lipids (CL) or polyethyleneimine (PEI) enables high levels of foreign gene expression in lung. However, these cationic DNA complexes cause substantial toxicity. The present study found that the inclusion of polyacrylic acid (pAA) with DNA/polycation and DNA/CL complexes prevented the serum inhibition of the transfection complexes in cultured cells. The mechanism mediating this increase seems to involve both particle size enlargement due to flocculation and electrostatic shielding from opsonizing serum proteins. The use of pAA also increased the levels of lung expression in mice in vivo substantially above the levels achieved with just binary complexes of DNA and linear PEI (lPEI) or CL and reduced their toxicity. Also, the use of a ‘chaser’ injection of pAA 30 min after injection of the ternary DNA/lPEI/pAA complexes further aided this effort to reduce toxicity while not affecting foreign gene expression. By optimizing the amount of pAA, lPEI, and DNA within the ternary complexes and using the ‘chaser’ injection, substantial levels of lung expression were obtained while avoiding adverse effects in lung or liver. These developments will aid the use of cationic DNA complexes in animals and for eventual human gene therapy.

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Acknowledgements

We would like to thank Mark Noble, Julia Hegge, and Stephanie Bertin for technical support and Hans Herweijer for helpful discussions. This study was funded in part by NIST ATP grant # 70NANB8H4064.

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Authors and Affiliations

  1. Mirus Corporation, Madison, WI, USA

    V S Trubetskoy, S C Wong, V Subbotin, A Loomis & J E Hagstrom

  2. Departments of Pediatrics and Medical Genetics, Waisman Center, University of Wisconsin-Madison, Madison, WI, USA

    V G Budker & J A Wolff

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  1. V S Trubetskoy
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  2. S C Wong
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  3. V Subbotin
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  4. V G Budker
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  7. J A Wolff
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Trubetskoy, V., Wong, S., Subbotin, V. et al. Recharging cationic DNA complexes with highly charged polyanions for in vitro and in vivo gene delivery. Gene Ther 10, 261–271 (2003). https://doi.org/10.1038/sj.gt.3301888

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  • DOI: https://doi.org/10.1038/sj.gt.3301888

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