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Intramuscular electroporation delivery of IFN-α gene therapy for inhibition of tumor growth located at a distant site

Gene Therapy volume 8, pages 400–407 (2001)Cite this article

Abstract

Although electroporation has been shown in recent years to be a powerful method for delivering genes to muscle, no gene therapy via electro-injection has been studied for the treatment of tumors. In an immunocompetent tumor-bearing murine model, we have found that delivery of a low dose of reporter gene DNA (10 μg) to muscle via electroporation under specific pulse conditions (two 25-ms pulses of 375 V/cm) increased the level of gene expression by two logs of magnitude. Moreover, administration of 10 μg of interferon (IFN)-α DNA plasmid using these parameters once a week for 3 weeks increased the survival time and reduced squamous cell carcinoma (SCC) growth at a distant site in the C3H/HeJ-immunocompetent mouse. IFN-α gene therapy delivered to muscle using electroporation demonstrated statistically significant (P < 0.05) therapeutic efficacy for treating SCC located at a distant site, compared with interleukin (IL)-2 or endostatin gene, also delivered by electro-injection. The increased therapeutic efficacy was associated with a high level and extended duration of IFN-α expression in muscle and serum. We also discovered that the high level of IFN-α expression correlated with increased expression levels of the antiangiogenic genes IP-10 and Mig in local tumor tissue, which may have led to the reduction of blood vessels observed at the local tumor site. Delivery of increasing doses (10–100 μg) of IFN-α plasmid DNA by injection alone did not increase antitumor activity, whereas electroporation delivery of increasing doses (10–40 μg) of IFN-α plasmid DNA did increase the survival time. Our data clearly demonstrate the potential utility of electroporation for delivery of gene therapy to muscle for the treatment of residual or disseminated tumors.

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Acknowledgements

We would like to thank Valentis, Inc., and Gentronics, Inc., for allowing us to use their gene constructs and electroporator, respectively, for this study. This work was partially supported by the Sam Walton Fund and a University of Arkansas for Medical Sciences pilot grant.

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Authors and Affiliations

  1. Department of Otolaryngology/Head and Neck Surgery, University of Arkansas School of Medicine, 4001 W Capital Avenue, Little Rock, 72205, AR, USA

    S Li, X Zhang, X Xia, L Zhou, R Breau, J Suen & E Hanna

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Li, S., Zhang, X., Xia, X. et al. Intramuscular electroporation delivery of IFN-α gene therapy for inhibition of tumor growth located at a distant site. Gene Ther 8, 400–407 (2001). https://doi.org/10.1038/sj.gt.3301418

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