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Neoantigen-specific T cell help outperforms non-specific help in multi-antigen DNA vaccination against cancer. | LitMetric

AI Article Synopsis

Article Abstract

CD4 T helper antigens are essential components of cancer vaccines, but the relevance of the source of these MHC class II-restricted antigens remains underexplored. To compare the effectiveness of tumor-specific versus tumor-unrelated helper antigens, we designed three DNA vaccines for the murine MC-38 colon carcinoma, encoding CD8 T cell neoantigens alone (noHELP) or in combination with either "universal" helper antigens (uniHELP) or helper neoantigens (neoHELP). Both types of helped vaccines increased the frequency of vaccine-induced CD8 T cells, and particularly uniHELP increased the fraction of KLRG1 and PD-1 effector cells. However, when mice were subsequently injected with MC-38 cells, only neoHELP vaccination resulted in significantly better tumor control than noHELP. In contrast to uniHELP, neoHELP-induced tumor control was dependent on the presence of CD4 T cells, while both vaccines relied on CD8 T cells. In line with this, neoHELP variants containing wild-type counterparts of the CD4 or CD8 T cell neoantigens displayed reduced tumor control. These data indicate that optimal personalized cancer vaccines should include MHC class II-restricted neoantigens to elicit tumor-specific CD4 T cell help.

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Source
http://www.ncbi.nlm.nih.gov/pmc/articles/PMC11261851PMC
http://dx.doi.org/10.1016/j.omton.2024.200835DOI Listing

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