Abstract
The inability to deliver growth factors locally in a transient but sustained manner is a substantial barrier to tissue regeneration. Systems capable of localized plasmid gene delivery for prolonged times may offer lower toxicity and should be well-suited for growth factor therapeutics. We investigated the potency of plasmid gene delivery from genes physically entrapped in a polymer matrix (gene activated matrix) using bone regeneration as the endpoint in vivo. Implantation of gene activated matrices at sites of bone injury was associated with retention and expression of plasmid DNA for at least 6 weeks, and with the induction of centimeters of normal new bone in a stable, reproducible, dose- and time-dependent manner.
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Acknowledgements
The authors acknowledge the assistance of M. Wagner (illustrations) and J. Baker, C. Debano, D. Kayner, K. Sweet, and R. Taylor (canine models and tissue preparation). J.B. thanks M. Young, Z. Shaked, D. Mooney, B. Abbott, and A. Baird for discussions. Thanks to P. Hoyle for advice and support. These studies were supported by a grant from NIH and by a Sponsored Research Agreement from Selective Genetics to the University of Michigan.
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Bonadio, J., Smiley, E., Patil, P. et al. Localized, direct plasmid gene delivery in vivo: prolonged therapy results in reproducible tissue regeneration. Nat Med 5, 753–759 (1999). https://doi.org/10.1038/10473
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DOI: https://doi.org/10.1038/10473
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