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Nucleic acid (DNA) immunization as a platform for dengue vaccine development
Kevin R Porter1, Kanakatte Raviprakash1
1Naval Medical Research Center, Infectious Diseases Directorate, Silver Spring, MD, United States.
Vaccine
|October 14, 2015
Summary
Developing a dengue DNA vaccine faces challenges. While pre-clinical studies showed promise, early human trials revealed poor antibody responses, necessitating further research to improve DNA vaccine immunogenicity.
Area of Science:
- Vaccinology
- Molecular Biology
- Immunology
Background:
- Dengue fever poses a significant threat, particularly to military personnel in endemic areas.
- DNA immunization has been explored since the 1990s as a potential vaccine platform for dengue.
- Previous approaches included naked DNA and live virus vectors.
Purpose of the Study:
- To review the development of a tetravalent dengue DNA vaccine.
- To identify challenges and successes in pre-clinical and clinical evaluations.
- To highlight ongoing efforts to enhance DNA vaccine immunogenicity.
Main Methods:
- Exploration of various DNA immunization strategies, including naked DNA and viral vectors.
- Pre-clinical animal studies to assess immune responses and protection.
- Phase 1 clinical trial of a monovalent dengue 1 DNA vaccine (prM and E genes).
Main Results:
- Pre-clinical studies demonstrated effective cellular and humoral anti-dengue immune responses in animals.
- Phase 1 trials showed T cell responses but lacked significant neutralizing antibody production.
- Suboptimal clinical outcomes were attributed to poor DNA vaccine plasmid uptake and expression.
Conclusions:
- DNA immunization offers advantages in vaccine manufacturing, genetic flexibility, and stability.
- Improving DNA vaccine immunogenicity remains a critical area of research.
- Further methods are needed to overcome limitations in clinical efficacy for dengue prevention.
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