Abstract：
:One approach to develop a malaria blood-stage vaccine is to target proteins that play critical roles in the erythrocyte invasion of merozoites. The merozoite surface proteins (MSPs) and the erythrocyte-binding antigens (EBAs) are considered promising vaccine candidates, for they are known to play important roles in erythrocyte invasion and are exposed to host immune system. Here we focused on a Plasmodium falciparum antigen, PfMSPDBL1 (encoded by PF10_0348 gene) that is a member of the MSP3 family and has both Duffy binding-like (DBL) domain and secreted polymorphic antigen associated with merozoites (SPAM) domain. Therefore, we aimed to characterize PfMSPDBL1 as a vaccine candidate. Recombinant full-length protein (rFL) of PfMSPDBL1 was synthesized by a wheat germ cell-free system, and rabbit antiserum was raised against rFL. We show that rabbit anti-PfMSPDBL1 antibodies inhibited erythrocyte invasion of wild type parasites in vitro in a dose dependent manner, and the specificity of inhibitory activity was confirmed using PfMSPDBL1 knockout parasites. Pre-incubation of the anti-PfMSPDBL1 antibodies with the recombinant SPAM domain had no effect on the inhibitory activity suggesting that antibodies to this region were not involved. In addition, antibodies to rFL were elicited by P. falciparum infection in malaria endemic area, suggesting the PfMSLDBL1 is immunogenic to humans. Our results suggest that PfMSPDBL1 is a novel blood-stage malaria vaccine candidate.
journal_name
Vaccinejournal_title
Vaccineauthors
Sakamoto H,Takeo S,Maier AG,Sattabongkot J,Cowman AF,Tsuboi Tdoi
10.1016/j.vaccine.2012.01.010subject
Has Abstractpub_date
2012-03-02 00:00:00pages
1972-80issue
11eissn
0264-410Xissn
1873-2518pii
S0264-410X(12)00013-8journal_volume
30pub_type
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