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

Gene Therapy
S LiE Hanna

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 microg) 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 microg of interferon (IFN)-alpha 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-alpha 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-alpha expression in muscle and serum. We also discovered that the high level of IFN-alpha expression correlated with increased expression levels ...Continue Reading

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Citations

Apr 5, 2008·Molecular Therapy : the Journal of the American Society of Gene Therapy·Ryan CraigShulin Li
Jun 17, 2005·Genes and Immunity·Wei-Yu ChenMing-Shi Chang
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