Abstract
One immunization with murine polyomavirus (MPyV) VP1 virus-like particles containing a fusion protein between MPyV VP2 and the extra cellular and transmembrane domain of Her2 (Her21–683PyVLPs) efficiently protects BALB/c mice from outgrowth of the Her2 expressing tumor D2F2/E2. To possibly enhance the anti-Her2 immune response and abrogate the induced anti-VLP antibody response, immunization with murine dendritic cells (DCs) loaded with Her21–683PyVLPs was performed. Mice were immunized once or more with 5 or 50 μg Her21–683PyVLPs alone or loaded on DCs, and challenged 14 days after the last immunization with a lethal dose of Her2-positive D2F2/E2 cells. Mice were protected from tumor outgrowth, when immunized only once with 5 or 50 μg Her21–683PyVLPs loaded on DCs, or 50 μg of Her21–683PyVLPs alone, whereas immunization once or more with 5 μg of Her21–683PyVLPs alone only protected half of the mice. Immunization with recombinant Her2 protein alone, or loaded on DCs, did not induce tumor immunity. Using both immunization strategies, Her2-specific T cell immunity was demonstrated, while Her2-specific antibodies were not detected. Loading VLPs on DCs reduced anti-VLP antibodies sixfold, but did not influence the efficiency of subsequent immunizations. Notably, DC maturation by Her21–683PyVLPs in vitro was not demonstrated although the IL-12 production was significantly increased. In conclusion, loading of VLPs on DCs can enhance specific VLP immunization considerably.
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Acknowledgments
We thank Fredrik Eriksson and Pavel Pisa for help with dendritic cells and Margareta Hagelin and Maj-Britt Alter for excellent technical assistance. The Swedish Cancer Foundation, the Swedish Medical Research Council (VR), the Gustav Vth Jubileum Society, the Stockholm Cancer Society, the Stockholm City Council, the EC 6th Frame Work program: COMPUVAC and the Karolinska Institute are acknowledged for financial support.
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Tegerstedt, K., Franzén, A., Ramqvist, T. et al. Dendritic cells loaded with polyomavirus VP1/VP2Her2 virus-like particles efficiently prevent outgrowth of a Her2/neu expressing tumor. Cancer Immunol Immunother 56, 1335–1344 (2007). https://doi.org/10.1007/s00262-007-0281-8
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DOI: https://doi.org/10.1007/s00262-007-0281-8