Immunization with attenuated Plasmodium falciparum sporozoites (PfSPZs) has been shown to be protective against malaria, but the features of the antibody response induced by this treatment remain unclear. To investigate this response in detail, we is ...
Immunization with attenuated Plasmodium falciparum sporozoites (PfSPZs) has been shown to be protective against malaria, but the features of the antibody response induced by this treatment remain unclear. To investigate this response in detail, we isolated IgM and IgG monoclonal antibodies from Tanzanian volunteers who were immunized with repeated injection of Sanaria PfSPZ Vaccine and who were found to be protected from controlled human malaria infection with infectious homologous PfSPZs. All isolated IgG monoclonal antibodies bound to P. falciparum circumsporozoite protein (PfCSP) and recognized distinct epitopes in its N terminus, NANP-repeat region, and C terminus. Strikingly, the most effective antibodies, as determined in a humanized mouse model, bound not only to the repeat region, but also to a minimal peptide at the PfCSP N-terminal junction that is not in the RTS,S vaccine. These dual-specific antibodies were isolated from different donors and were encoded by VH3-30 or VH3-33 alleles that encode tryptophan or arginine at position 52. Using structural and mutational data, we describe the elements required for germline recognition and affinity maturation. Our study provides potent neutralizing antibodies and relevant information for lineage-targeted vaccine design and immunization strategies.
Organizational Affiliation:
Biochemistry Department, University of Lausanne, Epalinges, Switzerland.,Center for Infectious Disease Research, Seattle, Washington, USA.,Swiss Institute of Bioinformatics (SIB), Lausanne, Switzerland.,Faculty of Science, University of Basel, Basel, Switzerland.,Radcliffe Department of Medicine, John Radcliffe Hospital, University of Oxford, Oxford, UK.,Ifakara Health Institute, Bagamoyo Clinical Trial Unit, Bagamoyo, Tanzania.,Department of Integrative Structural and Computational Biology, Scripps Research Institute, La Jolla, California, USA.,Skaggs Institute for Chemical Biology, Scripps Research Institute, La Jolla, California, USA.,Swiss Tropical and Public Health Institute, Clinical Immunology Unit, Basel, Switzerland.,Institute of Microbiology, ETH Zurich, Zurich, Switzerland.,Sanaria Inc., Rockville, Maryland, USA.,Institute for Research in Biomedicine, Università della Svizzera italiana, Bellinzona, Switzerland.
Download Mendeley
Download Endnote
