Abstract
In this study, a xenogeneic DNA vaccine encoding for human vascular endothelial growth factor receptor-2 (hVEGFR-2) was evaluated in two murine tumor models, the B16-F10 melanoma and the EO771 breast carcinoma model. The vaccine was administered by intradermal injection followed by electroporation. The immunogenicity and the biological efficacy of the vaccine were tested in (1) a prophylactic setting, (2) a therapeutic setting, and (3) a therapeutic setting combined with surgical removal of the primary tumor. The tumor growth, survival, and development of an immune response were followed. The cellular immune response was measured by a bioluminescence-based cytotoxicity assay with vascular endothelial growth factor-2 (VEGFR-2)-expressing target cells. Humoral immune responses were quantified by enzyme-linked immunosorbent assay (ELISA). Ex vivo bioluminescence imaging and immunohistological observation of organs were used to detect (micro)metastases. A cellular and humoral immune response was present in prophylactically and therapeutically vaccinated mice, in both tumor models. Nevertheless, survival in prophylactically vaccinated mice was only moderately increased, and no beneficial effect on survival in therapeutically vaccinated mice could be demonstrated. An influx of CD3+ cells and a slight decrease in VEGFR-2 were noticed in the tumors of vaccinated mice. Unexpectedly, the vaccine caused an increased quantity of early micrometastases in the liver. Lung metastases were not increased by the vaccine. These early liver micrometastases did however not grow into macroscopic metastases in either control or vaccinated mice when allowed to develop further after surgical removal of the primary tumor.
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Abbreviations
- CTC:
-
Circulating tumor cells
- eGFP:
-
Enhanced green fluorescent protein
- hVEGFR-2:
-
Human vascular endothelial growth factor-2
- IVIS:
-
In vivo imaging system
- PBS:
-
Phosphate buffered saline
- pDNA:
-
Plasmid DNA
- VEGFR-2:
-
Vascular endothelial growth factor-2
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Acknowledgements
This work was supported by a grant of Ghent University and by grants from the Fonds Wetenschappelijk onderzoek (G.0235.11N and G.0621.10N). The technical assistance of Sarah Loomans was greatly appreciated (Department of Pathology, Bacteriology and Avian Diseases, Faculty of Veterinary Medicine, Ghent University).
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SD and NNS conceived and designed the experiments. SD performed the experiments and together with NNS drafted the initial submission. BL managed the revision of the paper and together with NNS drafted the revised manuscript. HH and JDT assisted with the immunizations and the follow-up of the mice during the revision. SMC produced the pDNA vaccine and inoculated the mice during the revision. LC was involved in the immunizations of the initial submission. FC and MS assisted with the histology and immunohistochemistry.
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All experiments involving animals were in accordance with the ethical standards of the institution or practice at which the studies were conducted. The experiments were approved by the ethical committee of the Faculty of Veterinary Medicine (Ghent University, Belgium; EC-DI 2014-45).
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Denies, S., Leyman, B., Huysmans, H. et al. Evaluation of a xenogeneic vascular endothelial growth factor-2 vaccine in two preclinical metastatic tumor models in mice. Cancer Immunol Immunother 66, 1545–1555 (2017). https://doi.org/10.1007/s00262-017-2046-3
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DOI: https://doi.org/10.1007/s00262-017-2046-3