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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.)

Protective Malaria Vaccine in Mice Based on the Plasmodium vivax Circumsporozoite Protein Fused with the Mumps Nucleocapsid Protein

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Marques, Rodolfo F. [1] ; Gimenez, Alba Marina [1, 2] ; Aliprandini, Eduardo [3] ; Novais, Janaina T. [1] ; Cury, Diego P. [4] ; Watanabe, Ii-Sei [4] ; Dominguez, Mariana R. [1] ; Silveira, Eduardo L. V. [1] ; Amino, Rogerio [3] ; Soares, Irene S. [1]
Total Authors: 10
[1] Univ Sao Paulo, Sch Pharmaceut Sci, Dept Clin & Toxicol Anal, BR-05508000 Sao Paulo, SP - Brazil
[2] Univ Fed Sao Paulo, Ctr Cellular & Mol Therapy, BR-04044010 Sao Paulo, SP - Brazil
[3] Inst Pasteur, Unit Malaria Infect & Immun, F-75015 Paris - France
[4] Univ Sao Paulo, Inst Biomed Sci, Dept Anat, BR-05508000 Sao Paulo, SP - Brazil
Total Affiliations: 4
Document type: Journal article
Source: VACCINES; v. 8, n. 2 JUN 2020.
Web of Science Citations: 2

Plasmodium vivax is the most common species of human malaria parasite found outside Africa, with high endemicity in Asia, Central and South America, and Oceania. Although Plasmodium falciparum causes the majority of deaths, P. vivax can lead to severe malaria and result in significant morbidity and mortality. The development of a protective vaccine will be a major step toward malaria elimination. Recently, a formulation containing the three allelic variants of the P. vivax circumsporozoite protein (PvCSP-All epitopes) showed partial protection in mice after a challenge with the hybrid Plasmodium berghei (Pb) sporozoite, in which the PbCSP central repeats were replaced by the VK210 PvCSP repeats (Pb/Pv sporozoite). In the present study, the chimeric PvCSP allelic variants (VK210, VK247, and P. vivax-like) were fused with the mumps virus nucleocapsid protein in the absence (NLP-CSPR) or presence of the conserved C-terminal (CT) domain of PvCSP (NLP-CSPCT). To elicit stronger humoral and cellular responses, Pichia pastoris yeast was used to assemble them as nucleocapsid-like particles (NLPs). Mice were immunized with each recombinant protein adjuvanted with Poly (I:C) and presented a high frequency of antigen-specific antibody-secreting cells (ASCs) on days 5 and 30, respectively, in the spleen and bone marrow. Moreover, high IgG titers against all PvCSP variants were detected in the sera. Later, these immunized mice with NLP-CSPCT were challenged with Pb/Pv sporozoites. Sterile protection was observed in 30% of the challenged mice. Therefore, this vaccine formulation use has the potential to be a good candidate for the development of a universal 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 Opportunities: Research Projects - Thematic Grants
FAPESP's process: 14/18102-7 - Preclinical tests of recombinant adenovirus-based protein and vaccine formulations expressing the Plasmodium vivax circumsporozoite protein
Grantee:Alba Marina Gimenez
Support Opportunities: Scholarships in Brazil - Post-Doctorate