Abstract
We evaluated the cytotoxic effects (apoptosis, necrosis and early senescence) of human interferon-β (hIFNβ) gene lipofection. The cytotoxicity of hIFNβ gene lipofection resulted equivalent to that of the corresponding addition of the recombinant protein (rhIFNβ) on human tumor cell lines derived from Ewing's sarcoma (EW7 and COH) and colon (HT-29) carcinomas. However, it was stronger than rhIFNβ on melanoma (M8) and breast adenocarcinoma (MCF7). To reveal the mechanisms involved in these differences, we compared the effects of hIFNβ gene and rhIFNβ protein on EW7 and M8 (sensitive and resistant to rhIFNβ protein, respectively). Lipofection with hIFNβ gene caused a mitochondrial potential decrease simultaneous with an increase of oxidative stress in both cell lines. However, rhIFNβ protein displayed the same pattern of response only in EW7-sensitive cell line. The great bystander effect of the hIFNβ gene lipofection, involving the production of reactive oxygen species, would be among the main causes of its success. In EW7, this effect killed >60% of EW7 cell population, even though only 1% of cells were expressing the transgene. As hIFNβ gene was effective even in the rhIFNβ protein-resistant M8 cell line and in a way not limited by low lipofection efficiency, these results strongly support the clinical potential of this approach.
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Acknowledgements
We thank Dr Juana Wietzerbin for EW7 and COH cells, and Ana Bihary and Graciela Zenobi for technical assistance. This study was partially supported by grants from ANPCYT/FONCYT (PICT 2002-12084 and PICT 2007-00539) and UBA (PID-UBACYT-2008/2010-M027). GCG and LMEF are investigators, and MSV and MLG-C are fellows of the Consejo Nacional de Investigaciones Científicas y Técnicas (CONICET, Argentina).
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Villaverde, M., Gil-Cardeza, M., Glikin, G. et al. Interferon-β lipofection II. Mechanisms involved in cell death and bystander effect induced by cationic lipid-mediated interferon-β gene transfer to human tumor cells. Cancer Gene Ther 19, 420–430 (2012). https://doi.org/10.1038/cgt.2012.19
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DOI: https://doi.org/10.1038/cgt.2012.19