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Published on: May 18, 2016
Protective Immunity Induced by Virus-Like Particle Containing Merozoite Surface Protein 9 of Plasmodium berghei
Su-Hwa Lee1, Hae-Ji Kang1, Ki-Back Chu1
1Department of Biomedical Science, Graduate School, Kyung Hee University, Seoul 02447, Korea.
Abstract:
Merozoite surface protein 9 (MSP-9) from Plasmodium has shown promise as a vaccine candidate due to its location and possible role in erythrocyte invasion. In this study, we generated virus-like particles (VLPs) targeting P. berghei MSP-9, and investigated the protection against lethal doses of P. berghei in a mouse model. We found that VLP vaccination induced a P. berghei-specific IgG antibody response in the sera and CD4+ and CD8+ T cell populations in blood compared to a naïve control group. Upon challenge infection with P. berghei, vaccinated mice showed a significant increase in CD4+ and CD8+ effector memory T cell and memory B cell populations. Importantly, MSP-9 VLP immunization inhibited levels of the pro-inflammatory cytokines IFN-γ and IL-6 in the spleen and parasite replication in blood, resulting in significantly prolonged survival time. These results suggest that the MSP-9 VLP vaccine may constitute an effective malaria vaccine.
Insights
Virus-like particles (VLPs) targeting malaria merozoite surface protein 9 (MSP-9) induced immune responses in mice. This malaria vaccine candidate prolonged survival against Plasmodium berghei infection.
Area of Science:
- Immunology
- Vaccinology
- Parasitology
Background:
- Merozoite surface protein 9 (MSP-9) from Plasmodium is a potential malaria vaccine target.
- Its role in erythrocyte invasion makes it crucial for parasite lifecycle.
Purpose of the Study:
- To develop and evaluate virus-like particles (VLPs) targeting Plasmodium berghei MSP-9.
- To assess the protective efficacy of MSP-9 VLPs in a murine malaria model.
Main Methods:
- Generation of VLPs displaying P. berghei MSP-9.
- Immunization of mice with MSP-9 VLPs.
- Assessment of humoral and cellular immune responses (IgG, CD4+, CD8+ T cells).
- Evaluation of protection against lethal P. berghei challenge.
Main Results:
- VLP vaccination elicited P. berghei-specific IgG antibodies and T cell responses.
- Vaccinated mice showed increased CD4+ and CD8+ effector memory T cells and memory B cells.
- MSP-9 VLP immunization reduced pro-inflammatory cytokines (IFN-γ, IL-6), parasite replication, and prolonged survival.
Conclusions:
- MSP-9 VLPs effectively induced immune responses in mice.
- This malaria vaccine candidate demonstrated protection against P. berghei infection.
- MSP-9 VLPs show promise as a potential malaria vaccine.
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