title: A Prime/Boost PfCS14KM/MVA-sPfCSMVaccination Protocol Generates Robust CD8+T Cell and Antibody Responses to Plasmodium falciparum Circumsporozoite Protein and Protects Mice against Malaria.
abstract: Vaccines against the preerythrocytic stages of malaria are appealing because the parasite can be eliminated before disease onset and because they offer the unique possibility of targeting the parasite with both antibodies and T cells. Although the role of CD8+T cells in preerythrocytic malaria stages is well documented, a highly effective T cell-inducing vaccine remains to be advanced. Here we report the development of a prime-boost immunization regimen with thePlasmodium falciparumcircumsporozoite protein (PfCS) fused to the oligomer-forming vaccinia virus A27 protein and a modified vaccinia virus Ankara (MVA) vector expressing PfCS. This protocol induced polyfunctional CD8+T cells with an effector memory phenotype and high PfCS antibody levels. These immune responses correlated with inhibition of liver-stage parasitemia in 80% and sterile protection in 40% of mice challenged with a transgenicP. bergheiparasite line that expressed PfCS. Our findings underscore the potential of T and B cell immunization strategies for improving protective effectiveness against malaria.
authors.affiliation: Department of Molecular and Cellular Biology, Centro Nacional de Biotecnología, Consejo Superior de Investigaciones Científicas (CNB-CSIC), Madrid, Spain.
authors.forename: Aneesh
authors.initials: A
authors.lastname: Vijayan
authors.affiliation: Department of Molecular and Cellular Biology, Centro Nacional de Biotecnología, Consejo Superior de Investigaciones Científicas (CNB-CSIC), Madrid, Spain.
authors.forename: Ernesto
authors.initials: E
authors.lastname: Mejías-Pérez
authors.affiliation: Department of Molecular Microbiology and Immunology, Malaria Research Institute, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, Maryland, USA.
authors.forename: Diego A
authors.initials: DA
authors.lastname: Espinosa
authors.affiliation: Department of Molecular and Cellular Biology, Centro Nacional de Biotecnología, Consejo Superior de Investigaciones Científicas (CNB-CSIC), Madrid, Spain.
authors.forename: Suresh C
authors.initials: SC
authors.lastname: Raman
authors.affiliation: Biocomputing Unit, Centro Nacional de Biotecnología, Consejo Superior de Investigaciones Científicas (CNB-CSIC), Madrid, Spain.
authors.forename: Carlos Oscar S
authors.initials: COS
authors.lastname: Sorzano
authors.affiliation: Department of Molecular Microbiology and Immunology, Malaria Research Institute, Bloomberg School of Public Health, Johns Hopkins University, Baltimore, Maryland, USA.
authors.forename: Fidel
authors.initials: F
authors.lastname: Zavala
authors.affiliation: Department of Molecular and Cellular Biology, Centro Nacional de Biotecnología, Consejo Superior de Investigaciones Científicas (CNB-CSIC), Madrid, Spain mesteban@cnb.csic.es.
authors.forename: Mariano
authors.initials: M
authors.lastname: Esteban
mesh_terms: D000818:Animals; D000913:Antibodies, Protozoan / Q000276:immunology*; D018414:CD8-Positive T-Lymphocytes / Q000276:immunology*; D017780:Malaria Vaccines / Q000276:immunology*; D016778:Malaria, Falciparum / Q000276:immunology* / Q000517:prevention & control; D051379:Mice; D015800:Protozoan Proteins / Q000276:immunology*; D019444:Vaccines, DNA / Q000276:immunology
chemical_list: D000913:Antibodies, Protozoan; D017780:Malaria Vaccines; D015800:Protozoan Proteins; D019444:Vaccines, DNA
keywords: MVA-PfCS; P. falciparum circumsporozoite; antibodies; malaria vaccine; oligomeric PfCS; polyfunctional CD8+ T cells; transgenic P. berghei