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Prophylactic naked DNA vaccination with the human vascular endothelial growth factor induces an anti-tumor response in C57Bl/6 mice

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Abstract

Passive immunotherapy against soluble pro-angiogenic factors and/or their receptors in endothelial cells has become a promising approach in cancer therapeutics. There is also experimental evidence indicating that an active immunotherapy strategy directed towards these target molecules could also be effective. In this paper we show that it is possible to reduce tumor growth or increase the survival of tumor-bearing C57Bl/6 mice when animals are vaccinated with the human vascular endothelial growth factor (VEGF) isoform 121 gene (hVEGF121), and later challenged with melanoma or lung carcinoma tumor cells. Immunization was done with 10 μg DNA doses of the hVEGF121 gene, which is highly homologous to its mouse counterpart, administered on a weekly basis using a plasmid bearing 5 CpG bacterial motifs. Histopathology analyses of tumors of hVEGF121 immunized animals showed a decrease in tumor cell density around vessels and in mitotic figures, as well as an increase in apoptotic tumor cells. A statistically significant cell cytotoxic response was found when spleen cells of immunized mice were co-cultured in vitro with mouse tumor VEGF-producing cells. Vaccination with an hVEGF121 gene mutated to make it deficient for VEGF receptor binding, produced similar in vitro and in vivo results, and significantly reduced the number of spontaneous metastases produced by the mouse Lewis lung carcinoma. Our results indicate that human VEGF DNA can be employed for anti-angiogenic active immunotherapy in mice, and that direct cell cytotoxicity is a contributor mechanism to the overall anti-tumor effects seen in immunized animals.

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Acknowledgements

We thank Y. Soria for excellent technical assistance in animal handling and A. Vásquez for the histopathology analyses. We are also grateful to Dr. T. C. Wu for providing the TC-1 carcinoma model.

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Authors and Affiliations

  1. Recombinant Antibodies Laboratory, Cancer Research Department, Center for Genetic Engineering and Biotechnology, Cubanacán, Playa, P.O. Box 6162, Havana, 10600, Cuba

    Mónica Bequet-Romero, Marta Ayala, Boris E. Acevedo, Omar López Ocejo, Isis Torrens & Jorge V. Gavilondo

  2. Vaccine Division, Center for Genetic Engineering and Biotechnology, Cubanacán, Playa, Havana, Cuba

    Ernesto Galbán Rodríguez

Authors
  1. Mónica Bequet-Romero
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  2. Marta Ayala
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  3. Boris E. Acevedo
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  4. Ernesto Galbán Rodríguez
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  5. Omar López Ocejo
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  7. Jorge V. Gavilondo
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Correspondence to Mónica Bequet-Romero.

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Bequet-Romero, M., Ayala, M., Acevedo, B.E. et al. Prophylactic naked DNA vaccination with the human vascular endothelial growth factor induces an anti-tumor response in C57Bl/6 mice. Angiogenesis 10, 23–34 (2007). https://doi.org/10.1007/s10456-006-9062-9

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  • DOI: https://doi.org/10.1007/s10456-006-9062-9

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