alexa Systemic gene transfer of polyethylenimine (PEI)-plasmid DNA complexes to neonatal mice.
Molecular Biology

Molecular Biology

Journal of Cell Science & Therapy

Author(s): Wong SP, Argyros O, Howe SJ, Harbottle RP

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Abstract Non-viral vectors have not been extensively investigated in neonatal mice due to the poor efficiency of the delivery methods available. Understanding the effects of non-viral vectors during early development is vital to develop safe gene therapy treatments where irreversible pathological processes may be avoided by early gene reconstitution. Here we describe a simple and effective method for the systemic administration of non-viral vectors via the superior temporal vein of mouse pups at 1.5 days of age. We show that injection of polyethylenimine (PEI)-complexed plasmid DNA (pDNA) intravenously results in effective transfection in the liver, lung, heart, spleen, brain and kidney. We also investigate the specific targeting of transgene expression to the proliferating neonate liver using a liver-specific plasmid containing a Scaffold Matrix Attachment Region (S/MAR) element, which has previously been shown to confer long-term expression in adult mouse liver. Using bioluminescent imaging, a gradual increase in transgene expression was observed which peaked at days 11-12, before the reduction of expression to background levels by day 25, suggestive of vector copy number loss. We conclude that non-viral vectors can successfully be used for systemic delivery to neonatal mice and that this technique is likely to open a host of early therapeutic possibilities for gene transfer by a range of non-viral vector formulations. Copyright © 2011 Elsevier B.V. All rights reserved. This article was published in J Control Release and referenced in Journal of Cell Science & Therapy

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