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Published in: Cancer Immunology, Immunotherapy 12/2020

01-12-2020 | Original Article

The adjuvant effect of melanin is superior to incomplete Freund’s adjuvant in subunit/peptide vaccines in mice

Authors: Stefania Cuzzubbo, Claire Banissi, Marie Sophie Rouchon, Thi Tran, Corinne Tanchot, Eric Tartour, Antoine F. Carpentier

Published in: Cancer Immunology, Immunotherapy | Issue 12/2020

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Abstract

Peptide vaccines represent an attractive alternative to conventional anti-tumor therapies, but have not yet achieved significant clinical efficacy with commonly used formulations. Combination of short antigenic peptides, synthetic melanin and TLR9 agonist (Toll-like receptor 9, CpG-28) was reported as highly efficient to trigger strong CD8 + T-cell responses. We compared this vaccine approach to the standard adjuvant formulation that combines the incomplete Freund’s adjuvant (IFA) and CpG-28, using either an ovalbumin epitope (pOVA30) or a spontaneously occurring tumor neoepitope (mAdpgk).
Melanin-based vaccine induced significantly higher cytotoxic T lymphocytes (CTL) responses than IFA-based vaccine in both pOVA30- and mAdpgk-targeted vaccines. The anti-tumor efficacy of melanin-based vaccine was further assessed in mice, grafted either with E.G7-OVA cells (E.G7 cells transfected with ovalbumin) or with MC38 cells that spontaneously express the mAdpgk neoepitope. Melanin-based vaccine induced a major inhibition of E.G7-OVA tumor growth when compared to IFA-based vaccine (p < 0.001), but tumors eventually relapsed from day 24. In the MC38 tumor model, no significant inhibition of tumor growth was observed. In both cases, tumor escape appeared related to the loss of antigen presentation by tumor cells (loss of ovalbumin expression in E.G7-OVA model; poor presentation of mAdpgk in MC38 model), although the CTL responses displayed an effector memory phenotype, a high cytolytic potential and low programmed cell death-1 (PD1) expression.
In conclusion, synthetic melanin can be efficiently used as an adjuvant to enhance T-cells response against subunit vaccine antigens and compared favorably to the classic combination of IFA and TLR9 agonist in mice.
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Metadata
Title
The adjuvant effect of melanin is superior to incomplete Freund’s adjuvant in subunit/peptide vaccines in mice
Authors
Stefania Cuzzubbo
Claire Banissi
Marie Sophie Rouchon
Thi Tran
Corinne Tanchot
Eric Tartour
Antoine F. Carpentier
Publication date
01-12-2020
Publisher
Springer Berlin Heidelberg
Published in
Cancer Immunology, Immunotherapy / Issue 12/2020
Print ISSN: 0340-7004
Electronic ISSN: 1432-0851
DOI
https://doi.org/10.1007/s00262-020-02631-7

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