Abstract
The use of DNA vaccines has become an attractive approach for generating antigen-specific cytotoxic CD8+ T lymphocytes (CTLs), which can mediate protective antitumor immunity. The potency of DNA vaccines encoding weakly immunogenic tumor-associated antigens (TAAs) can be improved by using an adjuvant injected together with checkpoint antibodies. In the current study, we evaluated whether the therapeutic effects of a DNA vaccine encoding human papilloma virus type 16 (HPV-16) E7 can be enhanced by combined application of an immune checkpoint blockade directed against the programmed death-1 (PD-1) pathway and secondary lymphoid tissue chemokine (SLC) also known as CCL21 adjuvant, in a mouse cervical cancer model. The therapeutic effects of the DNA vaccine in combination with CCL21 adjuvant plus PD-1 blockade was evaluated using a tumor growth curve. To further investigate the mechanism underlying the antitumor response, cytolytic and lymphocyte proliferation responses in splenocytes were measured using non-radioactive cytotoxicity and MTT assays, respectively. Vascular endothelial growth factor (VEGF) and IL-10 expression in the tumor and the levels of IFN-γ and IL-4 in supernatants of spleno-lymphocyte cultures were measured using ELISA. The immune efficacy was evaluated by in vivo tumor regression assay. The results showed that vaccination with a DNA vaccine in combination with the CCL21 adjuvant plus PD-1 blockade greatly enhanced cytotoxic T lymphocyte production and lymphocyte proliferation rates and greatly inhibited tumor progression. Moreover, the vaccine in combination with adjuvant and blockade significantly reduced intratumoral VEGF, IL-10 and splenic IL-4 but induced the expression of splenic IFN-γ. This formulation could be an effective candidate for a vaccine against cervical cancers and merits further investigation.
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Abbreviations
- HPV:
-
Human papilloma virus
- APC:
-
Antigen-presenting cell
- CTL:
-
Cytolytic CD8+T lymphocyte
- DC:
-
Dendritic cells
- IFN- γ:
-
Interferon γ
- IL-4:
-
Interleukin 4
- VEGF:
-
Vascular endothelial growth factor
- IL-10:
-
Interleukin 10
- LDH:
-
Lactate dehydrogenase
- MTT:
-
3[4,5-Dimethylthiazol-2-ll]-2,5-diphenyltetrazolium bromide, thiazolyl-blue
- DMSO:
-
Dimethyl sulfoxide
- OD:
-
Optical density
- FBS:
-
Fetal bovine serum
- RPMI:
-
1640 Roswell Park Memorial Institute (name of the medium)
- Th:
-
T helper
- PD-1:
-
Programmed death-1
- SLC:
-
Secondary lymphoid tissue chemokine
- TAA:
-
Tumor-associated antigen
- TIL:
-
Tumor-infiltrating lymphocyte
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Acknowledgments
The authors would like to acknowledge Institute Pasteur of Iran and Golestan Medical University for the financial support. This project was extracted from a MSC thesis.
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This study was supported by Institute Pasteur of Iran and Research Deputy at Golestan Medical University through Grant Project Number 157495.
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The authors declare that they have no conflict of interest.
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The animal protocol used in this study was approved by the local animal ethics council of Golestan Ethics Committee of Golestan University of Medical Sciences (ethics number: et-157495). All experimental procedures involving mice were performed in accordance with the national experimental guidelines.
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The original version of this article was revised: “Unfortunately, the fourth author name “Mahdieh Mondanizadeh” was incorrectly published in this original version and the same is corrected here”.
An erratum to this article is available at http://dx.doi.org/10.1007/s00705-016-3160-9.
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Moeini, S., Saeidi, M., Fotouhi, F. et al. Synergistic effect of programmed cell death protein 1 blockade and secondary lymphoid tissue chemokine in the induction of anti-tumor immunity by a therapeutic cancer vaccine. Arch Virol 162, 333–346 (2017). https://doi.org/10.1007/s00705-016-3091-5
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DOI: https://doi.org/10.1007/s00705-016-3091-5