Immunogenicity Analysis of the Recombinant Plasmodium falciparum Surface-Related Antigen in Mice.

Yu, Jia-Li; Liu, Qing-Yang; Yang, Bo; Sun, Yi-Fan; Wang, Ya-Ju; Jiang, Jian; Wang, Bo; Cheng, Yang; Wang, Qiu-Bo

Plasmodium falciparum, mainly distributed in tropical and subtropical regions of the world, has received widespread attention owing to its severity. As a novel protein, P. falciparum surface-related antigen (PfSRA) has the structural and functional characteristics to be considered as a malaria vaccine candidate; however, limited information is available on its immunogenicity. Here, we expressed three fragments of recombinant PfSRA in an Escherichia coli system and further analyzed its immunogenicity. The results showed that rPfSRA-immunized mice produced specific antibodies with high endpoint titers (1:10,000 to 1:5,120,000) and affinity antibodies (i.e., rPfSRA-F1a (97.70%), rPfSRA-F2a (69.62%), and rPfSRA-F3a (91.87%)). In addition, the sera of immunized mice recognized both the native PfSRA and recombinant PfSRA, the rPfSRA antibodies inhibited the invasion of P. falciparum into the erythrocytes, and they were dose-dependent in vitro. This study confirmed PfSRA could be immunogenic, especially the F1a at the conserved region N-terminal and provided further support for it as a vaccine candidate against P.falciparum.

IMMUNE response; PLASMODIUM falciparum; ANTIGENS; ERYTHROCYTES; MALARIA vaccines; MICE; ESCHERICHIA coli

Pathogens, 2022, Vol 11, Issue 5, p550

2076-0817

Academic Journal

10.3390/pathogens11050550