Protective Immunity Induced by Virus-Like Particle Containing Merozoite Surface Protein 9 of Plasmodium berghei

SH Lee, HJ Kang, KB Chu, S Basak, DH Lee, EK Moon… - Vaccines, 2020 - mdpi.com
SH Lee, HJ Kang, KB Chu, S Basak, DH Lee, EK Moon, FS Quan
Vaccines, 2020mdpi.com
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 …
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.
MDPI
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