Abstract
DNA vaccination has historically failed to raise strong immune responses in humans. Recent delivery techniques such as the gene gun and in vivo electroporation (EP)/electrotransfer (ET) have completely changed the efficiency of DNA vaccines in humans. In vivo EP exerts multiple effects that contribute to its efficiency. The two central factors are most likely the increased DNA uptake due to the transient membrane destabilization, and the local tissue damage acting as an adjuvant. To date, several studies in humans have used in vivo EP/ET to deliver DNA. Some of these results have been quite promising with strong T cell responses and/or transient effects on the viral replication. This suggests that improved strategies of in vivo EP/ET can be a future way to deliver DNA in humans.
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Acknowledgments
Much of the work described herein has been funded by Swedish Science Council, the Swedish Cancer Foundation, the Stockholm County Council, Karolinska Institutet, and Chrontech Pharma.
Conflict of interest
MS is a board member of Chrontech which holds the commercial rights to the NS3/4A-based DNA vaccine.
Ethical standard
All studies discussed herein reported on clinical trials that had been approved by the appropriate ethical committees and government agencies.
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This article is part of the special issue “Therapeutic vaccination in chronic hepatitis B—approaches, problems, and new perspectives.”
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Sällberg, M., Frelin, L., Ahlén, G. et al. Electroporation for therapeutic DNA vaccination in patients. Med Microbiol Immunol 204, 131–135 (2015). https://doi.org/10.1007/s00430-014-0384-8
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DOI: https://doi.org/10.1007/s00430-014-0384-8