Abstract
In situ expression of a foreign antigen and an immune-modulating cytokine by intratumoral DNA electroporation was tested as a cancer therapy regimen. Transgene expression in the tumors was sustained for 2–3 weeks after intratumoral electroporation with mammalian expression plasmid containing firefly luciferase cDNA. Electroporation with cDNA encoding tetanus toxin fragment C (TetC) induced tetanus toxin-binding antibody, demonstrating immune recognition of the transgene product. Intratumoral electroporation with TetC and IL-12 cDNA after mice were treated with CD25 mAb to remove regulatory T cells induced IFN-γ producing T-cell response to tumor-associated antigen, heavy inflammatory infiltration, regression of established tumors and immune memory to protect mice from repeated tumor challenge. Intratumoral expression of immune-modulating molecules may be most suitable in the neoadjuvant setting to enhance the therapeutic efficacy and provide long-term protection.
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This study was supported by NIH CA76340 and CA125680 (WZW).
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Radkevich-Brown, O., Piechocki, M.P., Back, J.B. et al. Intratumoral DNA electroporation induces anti-tumor immunity and tumor regression. Cancer Immunol Immunother 59, 409–417 (2010). https://doi.org/10.1007/s00262-009-0760-1
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DOI: https://doi.org/10.1007/s00262-009-0760-1