title: Immunogenicity of Plasmodium vivax combination subunit vaccine formulated with human compatible adjuvants in mice.
abstract: An effective malaria vaccine will probably require the delivery of multiple antigens that induce several layers of immunity. Malaria antigens expressed on the surface and in apical organelles of blood-stage merozoites are potential vaccine candidates given their importance in the invasion of erythrocytes. The present study examined the kinetics of humoral response in BALB/c mice following immunization with combination of two blood-stage Plasmodium vivax invasion related molecules, the N-terminal, cysteine-rich region II of P. vivax Duffy binding protein (PvRII) and the 19kDa C-terminal region of merozoite surface protein 1 (PvMSP1(19)) formulated with Montanide ISA 720 and alhydrogel. Immunization with combination of recombinant PvRII and PvMSP1(19) formulated with the Montanide ISA 720 elicited higher antibody titer compared to the alhydrogel formulation. In case of both the adjuvants tested, combination of PvRII and PvMSP1(19) did not result in suppression of antibody response against either antigen when compared to immunization with individual antigens alone. Analysis of IgG subclasses showed that combination of both the recombinant proteins induced a mixed Th1/Th2-type response with almost all IgG subtypes being expressed in equivalent amount. Antibodies elicited against PvRII showed significant inhibitory effect on the binding of PvRII to recombinant Duffy antigen receptor for chemokines (DARC) in an in vitro binding assay. The results of the present study provide a rationale for a combination vaccine against P. vivax malaria based on PvMSP1(19) and PvRII.
authors.affiliation: Malaria Group, International Centre for Genetic Engineering and Biotechnology (ICGEB), P.O. Box 10504, Aruna Asaf Ali Marg, New Delhi 110067, India.
authors.forename: Yengkhom Sangeeta
authors.initials: YS
authors.lastname: Devi
authors.forename: Paushali
authors.initials: P
authors.lastname: Mukherjee
authors.forename: Syed Shams
authors.initials: SS
authors.lastname: Yazdani
authors.forename: Ahmad Rushdi
authors.initials: AR
authors.lastname: Shakri
authors.forename: Suman
authors.initials: S
authors.lastname: Mazumdar
authors.forename: Sunita
authors.initials: S
authors.lastname: Pandey
authors.forename: Chetan E
authors.initials: CE
authors.lastname: Chitnis
authors.forename: Virander S
authors.initials: VS
authors.lastname: Chauhan
mesh_terms: D000276:Adjuvants, Immunologic / Q000008:administration & dosage; D000818:Animals; D000913:Antibodies, Protozoan / Q000097:blood; D000917:Antibody Formation / Q000276:immunology; D000953:Antigens, Protozoan / Q000235:genetics / Q000276:immunology*; D015153:Blotting, Western; D002851:Chromatography, High Pressure Liquid; D004797:Enzyme-Linked Immunosorbent Assay; D007114:Immunization / Q000379:methods; D007074:Immunoglobulin G / Q000097:blood; D017780:Malaria Vaccines / Q000008:administration & dosage / Q000276:immunology*; D016780:Malaria, Vivax / Q000276:immunology / Q000517:prevention & control; D008297:Male; D020066:Merozoite Surface Protein 1 / Q000235:genetics / Q000276:immunology; D051379:Mice; D008807:Mice, Inbred BALB C; D010966:Plasmodium vivax / Q000235:genetics / Q000276:immunology*; D015800:Protozoan Proteins / Q000235:genetics / Q000276:immunology*; D011956:Receptors, Cell Surface / Q000235:genetics / Q000276:immunology; D011994:Recombinant Proteins / Q000276:immunology; D013997:Time Factors
chemical_list: D000276:Adjuvants, Immunologic; D000913:Antibodies, Protozoan; D000953:Antigens, Protozoan; C066001:Duffy antigen binding protein, Plasmodium; D007074:Immunoglobulin G; D017780:Malaria Vaccines; D020066:Merozoite Surface Protein 1; D015800:Protozoan Proteins; D011956:Receptors, Cell Surface; D011994:Recombinant Proteins