期刊
VACCINE
卷 27, 期 28, 页码 3692-3696出版社
ELSEVIER SCI LTD
DOI: 10.1016/j.vaccine.2009.04.013
关键词
Carcinoembryonic antigen; DNA vaccine; Electroporation
资金
- Swedish Research Council
- Swedish National Board for Health and Welfare
- Magn. Bergvall Foundation
- Lars Hierta Memorial Foundation
- Sigurd and Elsa Goljes Memorial Foundation
- Swedish Cancer and Allergy Fund
Heterologous boost immunisation is considered the most efficient way to enhance DNA-primed immune responses. We have previously shown that administration of recombinant carcinoembryonic antigen (CEA) efficiently boosts humoral responses in mice primed with CEA DNA. However, clinical grade recombinant proteins are far more intriguing to produce than plasmid DNA. Therefore, the possibility to use plasmid DNA for both priming and boosting would be beneficial. With the prospect of future use in a clinical trial, we investigated if electroporation-mediated delivery of DNA could be used to boost DNA-primed immune responses to CEA. The Biojector was used to prime BALB/c mice intradermally three times with CEA66 DNA, encoding an intracellular modified form of CEA. Twelve weeks after the last prime, the animals received either one injection of recombinant CEA or one intradermal injection of twtCEA DNA, encoding the wild type CEA fused to a tetanus T helper epitope, in combination with electroporation. Boosting with rCEA protein did not enhance T cell responses to CEA but induced CEA-specific IgG in 4 of 8 mice. In contrast, intradermal delivery of twtCEA DNA by electroporation led to a tenfold increase in IFN-gamma-producing CD8+ T cells, compared to the levels obtained after the third priming immunisation. The DNA boost also induced high CEA-specific IgG titers in all immunised animals (8/8). The data suggests that a late DNA boost, in combination with enhanced DNA delivery by electroporation, could be used to enhance the efficiency of DNA vaccination and substitute for a heterologous protein boost vaccination. (C) 2009 Elsevier Ltd. All rights reserved.
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