title: Systematic analysis of natural antibody responses to P. falciparum merozoite antigens by protein arrays.
abstract: With the completion of the functional genome, merozoite proteome and stage-specific transcriptomes of the intraerythrocytic developmental cycle of Plasmoidum falciparum, the development of new vaccine candidates targeting Plasmodium merozoites is now possible. Here we report using protein array technology to detect antibody responses to Plasmodium merozoite proteins by screening the serum of Plasmodium-exposed individuals. A total of 138 genes encoding P. falciparum merozoite proteins were cloned using the In-Fusion cloning method and expressed using a wheat germ cell-free system (WGCF). These proteins were then screened with serum from Plasmodium-exposed individuals and unexposed subjects using protein arrays. A total of 30 highly immunoreactive merozoite antigens were identified (21.7% of 138 target proteins), including 10 well-characterized blood-stage vaccine candidates for P. falciparum. In addition, we report for the first time 7 proteins (MSP3.5, MRSP2, ETRAMP11.2, ETRAMP14.1 and RALP1, and two hypothetical proteins PFA0210c and PF14_0572) as being immunologically reactive. These novel Plasmodium merozoite antigens may be potential vaccine candidates for blood-stage malaria, and warrant further study.
authors.affiliation: National Institute of Parasitic Diseases, Chinese Center for Disease Control and Prevention, WHO Collaborating Centre for Malaria, Schistosomiasis and Filariasis, Key Laboratory of Parasite and Vector Biology Ministry of Health, Shanghai 200025, People's Republic of China.
authors.forename: Yan-Ting
authors.initials: YT
authors.lastname: Fan
authors.forename: Yue
authors.initials: Y
authors.lastname: Wang
authors.forename: Chuan
authors.initials: C
authors.lastname: Ju
authors.forename: Ting
authors.initials: T
authors.lastname: Zhang
authors.forename: Bin
authors.initials: B
authors.lastname: Xu
authors.forename: Wei
authors.initials: W
authors.lastname: Hu
authors.forename: Jun-Hu
authors.initials: JH
authors.lastname: Chen
mesh_terms: D000293:Adolescent; D000328:Adult; D000913:Antibodies, Protozoan / Q000097:blood / Q000276:immunology*; D000953:Antigens, Protozoan / Q000097:blood / Q000276:immunology*; D005260:Female; D006801:Humans; D016778:Malaria, Falciparum / Q000097:blood / Q000276:immunology*; D008297:Male; D052940:Merozoites / Q000276:immunology* / Q000378:metabolism; D008875:Middle Aged; D010963:Plasmodium falciparum / Q000276:immunology* / Q000378:metabolism; D040081:Protein Array Analysis / Q000379:methods*
chemical_list: D000913:Antibodies, Protozoan; D000953:Antigens, Protozoan