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scFv6.C4 DNA vaccine with fragment C of Tetanus toxin increases protective immunity against CEA-expressing tumor

Abstract

The carcinoembryonic antigen (CEA) is the main tumor-associated antigen of colorectal cancers. Previously, we developed a DNA vaccine using scFv6.C4, a CEA surrogate, against CEA-expressing tumors; 40% of the vaccinated mice were tumor-free after tumor challenge. In order to enhance vaccine efficacy, fragment C of Tetanus Toxin (FrC) was tested as adjuvant. C57BL/6J-CEA2682 mice were electroporated intramuscularly 4 times with uP-PS/scFv6.C4-FrC or uP-PS/scFv6.C4, challenged by s.c. injection of 1 × 105 MC38-CEA cells, and tumor growth was monitored over 100 days. The humoral and cellular immune responses were assessed by ELISA, immunocytochemistry, in-vitro lymphocyte proliferation, and CTL cytotoxicity assays. Immunization with uP-PS/scFv6.C4-FrC or uP-PS/scFv6.C4 induced similar anti-CEA antibody titers. However, immunocytochemistry analysis showed stronger staining with uP-PS/scFv6.C4-FrC-immunized mice sera. When challenged with MC38-CEA cells, 63% of the FrC-vaccinated mice did not develop tumors, half of the rest had a significant tumor growth delay, and the probability of being free of tumors was on average 40% higher than that of scFv6.C4-immunized mice. Addition of the adjuvant led to higher CD4+ and CD8+ proliferative responses and strong CD8+ CTL response against MC38-CEA cells. DNA immunization with scFv6.C4 and FrC increased antitumor effect via induction of high and specific humoral and cellular immune responses to CEA.

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Acknowledgements

This work was supported by São Paulo Research Foundation (FAPESP; Grant Numbers: 2012/21861-1 and # 2013/17224-9). BFZ was a recipient of FAPESP scholarship (2012/21861-1).

Authors’ contributions

BFZ: conception and design of the study, acquisition of data, analysis and interpretation of the data, drafting of the manuscript; CPF: acquisition of data, analysis and interpretation of data; JRCV: analysis and interpretation of the data; SWH: conception and design of the study, drafting of the manuscript, critical review of the manuscript for important intellectual content, and final approval of the version to be submitted.

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Zanetti, B.F., Ferreira, C.P., de Vasconcelos, J.R.C. et al. scFv6.C4 DNA vaccine with fragment C of Tetanus toxin increases protective immunity against CEA-expressing tumor. Gene Ther 26, 441–454 (2019). https://doi.org/10.1038/s41434-019-0062-y

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