An abundant merozoite surface protein of <i>Plasmodium falciparum</i> modulates susceptibility to inhibitory antibodies
Malaria merozoite surface proteins (MSPs) are thought to have important roles in red blood cell (RBC) invasion and their exposure on the parasite surface makes them attractive vaccine candidates. However, their role in invasion has not been directly demonstrated and their biological functions remain unknown. One of the most abundant merozoite surface proteins is Pf MSP2, a likely ancestral…
Plasmodium falciparum, a cause of malaria, harbors a protein known as merozoite surface protein 2 (MSP2). This protein, being the most abundant of its kind, is a prime target for vaccine development. However, a recent study has unveiled an unexpected role for MSP2 that could significantly impact our understanding of malaria immunity and vaccine design.
Scientists employed CRISPR-Cas9 gene editing to remove MSP2 from two distinct strains of P. falciparum. Remarkably, the absence of MSP2 did not affect the parasite's ability to invade red blood cells (RBCs) or alter its overall phenotype under laboratory conditions. This suggests that MSP2 is not indispensable for RBC invasion.
A more intriguing discovery emerged when researchers examined the impact of MSP2 loss on the efficacy of antibodies targeting other merozoite proteins involved in invasion, particularly Pf AMA1. They found that increasing concentrations of MSP2 protein reduced the binding of these protective antibodies in a dose-dependent manner. This indicates that MSP2 can modulate the susceptibility of merozoites to antibodies that would otherwise provide immunity.
The study's findings challenge the conventional view of MSP2's role in malaria. Traditionally, it has been considered a protein that aids in RBC invasion, but this research suggests a more complex function. MSP2 can potentially reduce the effectiveness of antibodies that target other merozoite proteins, thereby influencing the overall protective capacity of the immune system.
These results have profound implications for malaria research and vaccine development. They highlight the need to reconsider the functions of MSP2 and other surface proteins in the context of malaria immunity. Furthermore, they underscore the importance of exploring the intricate relationships between different merozoite proteins to design more effective vaccines that can elicit robust and durable immune responses against malaria.
Written by urgent.news from eLife's reporting — not their text. Machine-written — may contain errors; check the original before relying on it.
