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Optimization of DNA vaccination against cutaneous leishmaniasis
Susana Méndez1, Yasmine Belkaid, Robert A Seder
1National Institute of Allergy and Infectious Diseases, National Institutes of Health, Room 126, Building 4, Center Dr MSC 0425, Bethesda, MD 20892-0425, USA.
Abstract:
The present studies were designed to examine the requirements of dose, route of inoculation and constituent antigens for the maintenance of complete and long lasting protection against cutaneous leishmaniasis due to Leishmania major conferred by a cocktail DNA vaccine encoding the Leishmania antigens LACK, LmST11 and TSA. Vaccination of C57Bl/6 mice with LACK DNA alone resulted in partial protection, whereas the combination of LmST11 and TSA provided stronger, though still incomplete protection compared to the combination of all three Ag DNAs. When intradermal (i.d), intramuscular (i.m.), and subcutaneous (s.c.) vaccination routes were compared, i.d. immunization reduced by five-fold the dose necessary to maintain complete protection. In vivo depletion of CD4+ or CD8+ T cells provided direct evidence that both populations are necessary to mediate complete protection. These results establish intradermal vaccination using DNA encoding multiple Leishmania antigens as a way to optimize priming of CD4+ and CD8+ T cells necessary for potent and durable protection against cutaneous leishmaniasis.
Insights
This study optimized DNA vaccination for cutaneous leishmaniasis. Intradermal delivery of multiple Leishmania antigens primes CD4+ and CD8+ T cells for durable protection.
Area of Science:
- Immunology
- Vaccinology
- Parasitology
Background:
- Cutaneous leishmaniasis remains a significant global health challenge.
- Developing effective and long-lasting vaccines against Leishmania major is crucial.
- Current vaccine strategies require optimization for robust immune responses.
Purpose of the Study:
- To investigate dose, route, and antigen requirements for a DNA vaccine against cutaneous leishmaniasis.
- To evaluate the efficacy of a cocktail DNA vaccine encoding LACK, LmST11, and TSA antigens.
- To determine the role of CD4+ and CD8+ T cells in vaccine-induced protection.
Main Methods:
- Vaccination of C57Bl/6 mice with DNA encoding Leishmania antigens.
- Comparison of different vaccination routes: intradermal (i.d.), intramuscular (i.m.), and subcutaneous (s.c.).
- Assessment of protection levels and T cell involvement (CD4+ and CD8+ depletion).
Main Results:
- A cocktail DNA vaccine encoding LACK, LmST11, and TSA demonstrated protective efficacy.
- Intradermal vaccination significantly reduced the required antigen dose for complete protection.
- Both CD4+ and CD8+ T cell populations were essential for mediating complete protection.
Conclusions:
- Optimized DNA vaccination strategies are key for effective cutaneous leishmaniasis control.
- Intradermal delivery of multi-antigen DNA vaccines enhances T cell priming.
- This approach offers a promising avenue for developing potent and durable vaccines against leishmaniasis.