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(Reference retrieved automatically from Web of Science through information on FAPESP grant and its corresponding number as mentioned in the publication by the authors.)

Vaccine Containing the Three Allelic Variants of the Plasmodium vivax Circumsporozoite Antigen Induces Protection in Mice after Challenge with a Transgenic Rodent Malaria Parasite

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Gimenez, Alba Marina [1] ; Lima, Luciana Chagas [2, 1] ; Francoso, Katia Sanches [2] ; Denapoli, Priscila M. A. [1] ; Panatieri, Raquel [3, 4] ; Bargieri, Daniel Y. [3] ; Thiberge, Jean-Michel [4] ; Andolina, Chiara [5, 6] ; Nosten, Francois [5, 6] ; Renia, Laurent [7] ; Nussenzweig, Ruth S. [8] ; Nussenzweig, Victor [8] ; Amino, Rogerio [4] ; Rodrigues, Mauricio M. [1] ; Soares, Irene S. [2]
Total Authors: 15
[1] Univ Fed Sao Paulo, Ctr Cellular & Mol Therapy CTCMol, Dept Microbiol Immunol & Parasitol, Sao Paulo - Brazil
[2] Univ Sao Paulo, Sch Pharmaceut Sci, Dept Clin & Toxicol Anal, Sao Paulo - Brazil
[3] Univ Sao Paulo, Dept Parasitol, Sao Paulo - Brazil
[4] Inst Pasteur, Unit Malaria Infect & Immun, Paris - France
[5] Mahidol Univ, Fac Trop Med, Shoklo Malaria Res Unit, Mahidol Oxford Trop Med Res Unit, Mae Sot - Thailand
[6] Univ Oxford, Nuffield Dept Med Res Bldg, Ctr Trop Med & Global Hlth, Oxford - England
[7] Agcy Sci Technol & Res, Biopolis, Singapore Immunol Network, Singapore - Singapore
[8] NYU, Sch Med, New York, NY - USA
Total Affiliations: 8
Document type: Journal article
Source: FRONTIERS IN IMMUNOLOGY; v. 8, OCT 11 2017.
Web of Science Citations: 2

Plasmodium vivax is the most common species that cause malaria outside of the African continent. The development of an efficacious vaccine would contribute greatly to control malaria. Recently, using bacterial and adenoviral recombinant proteins based on the P. vivax circumsporozoite protein (CSP), we demonstrated the possibility of eliciting strong antibody-mediated immune responses to each of the three allelic forms of P. vivax CSP (PvCSP). In the present study, recombinant proteins representing the PvCSP alleles (VK210, VK247, and P. vivax-like), as well as a hybrid polypeptide, named PvCSP-All epi-topes, were generated. This hybrid containing the conserved C-terminal of the PvCSP and the three variant repeat domains in tandem were successfully produced in the yeast Pichia pastoris. After purification and biochemical characterization, they were used for the experimental immunization of C57BL/6 mice in a vaccine formulation containing the adjuvant Poly(I: C). Immunization with a recombinant protein expressing all three different allelic forms in fusion elicited high IgG antibody titers reacting with all three different allelic variants of PvCSP. The antibodies targeted both the C-terminal and repeat domains of PvCSP and recognized the native protein on the surface of P. vivax sporozoites. More importantly, mice that received the vaccine formulation were protected after challenge with chimeric Plasmodium berghei sporozoites expressing CSP repeats of P. vivax sporozoites (Pb/PvVK210). Our results suggest that it is possible to elicit protective immunity against one of the most common PvCSP alleles using soluble recombinant proteins expressed by P. pastoris. These recombinant proteins are promising candidates for clinical trials aiming to develop a multiallele vaccine against P. vivax malaria. (AU)

FAPESP's process: 12/13032-5 - Generation and analysis of the immunogenicity of recombinant proteins based on the different allelic forms of the circumsporozoite antigen of Plasmodium vivax aiming at the development of a universal vaccine against malaria
Grantee:Irene da Silva Soares
Support type: Research Projects - Thematic Grants