Abstract
In DNA vaccination, CD4+ T-cell help can be enhanced by fusion of a gene encoding an immunization protein with a foreign gene or its part providing Th epitopes. To study the effect of helper epitope localization in a protein molecule, the influence of the vicinity of the helper epitope, and the impact of chimeric protein cellular localization, we fused the helper epitope p30 from tetanus toxin (TT, aa 947–967) with the N- or C-terminus of the mutated E7 oncoprotein (E7GGG) of human papillomavirus type 16, enlarged the p30 epitope with the flanking residues containing potential protease-sensitive sites and altered the cellular localization of the fusion constructs by signal sequences. The p30 epitope enhanced the E7-specific response, but only in constructs without added signal sequences. After localization of the fusion proteins into the endoplasmic reticulum and endo/lysosomal compartment, the TT-specific Th2 response was increased. The synthetic Pan DR epitope (PADRE) induced a stronger E7-specific response than the p30 epitope and its stimulatory effect was not limited to nuclear/cytoplasmic localization of the E7 antigen. These results suggest that in the optimization of immune responses by adding helper epitopes to DNA vaccines delivered by the gene gun, the cellular localization of the antigen needs to be taken into account.
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Acknowledgements
We thank P Vesela and T Novakova for technical assistance. This work was supported by grants NT11541-4/2010 from the Ministry of Health of the Czech Republic, P501/12/1761 from the Czech Science Foundation, and ERDF OPPK CZ.2.16/3.1.00/24001.
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Smahel, M., Polakova, I., Duskova, M. et al. The effect of helper epitopes and cellular localization of an antigen on the outcome of gene gun DNA immunization. Gene Ther 21, 225–232 (2014). https://doi.org/10.1038/gt.2013.81
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DOI: https://doi.org/10.1038/gt.2013.81