Polymer multilayer tattooing for enhanced DNA vaccination

Area of Science:

• Vaccinology
• Biomaterials Science
• Immunology

Background:

• DNA vaccines offer potential but struggle with low human immune responses.
• In vivo electroporation improves DNA vaccine efficacy but is not ideal.
• Safe, reproducible, and pain-free DNA vaccination strategies are needed.

Purpose of the Study:

• To develop a novel DNA vaccination method using microneedle-delivered polymer films.
• To assess the safety, reproducibility, and efficacy of this new vaccination approach.
• To enhance immune responses and gene expression compared to existing methods.

Main Methods:

• Developed vaccine-loaded polymer films containing DNA, immune-stimulatory RNA, and polycations.
• Utilized microneedles coated with releasable polyelectrolyte multilayers for film implantation into the epidermis.
• Assessed DNA and adjuvant persistence, local transfection, and immune responses in mice and non-human primates.

Main Results:

• The 'multilayer tattoo' DNA vaccines promoted local transfection and controlled DNA/adjuvant persistence.
• Immune responses against an HIV antigen in mice were comparable to electroporation.
• Gene expression in non-human primate skin was 140-fold higher than with intradermal DNA injection.
• Enhanced memory T-cell generation was observed.

Conclusions:

• Microneedle-delivered polymer films offer a promising strategy for enhancing DNA vaccination.
• This approach demonstrates potential for improved safety, reproducibility, and efficacy.
• The 'multilayer tattoo' method shows significant promise for future vaccine development.