title: Use of reconstituted influenza virus virosomes as an immunopotentiating delivery system for a peptide-based vaccine.
abstract: Immunopotentiating reconstituted influenza virosomes (IRIV) were used as a delivery system for the synthetic peptide-based malaria vaccine SPf66. The reduced SPf66 peptide molecules containing terminal cysteine residues were covalently attached to phosphatidylethanolamine with the heterobifunctional crosslinker gamma-maleimidobutyric acid N-hydroxysuccinimide ester. The SPf66-phosphatidylethanolamine was incorporated into IRIV and BALB/c mice were immunized twice by intramuscular injection with peptide-loaded virosomes. Titres of elicited anti-SPf66 IgG were determined by ELISA. These titres were significantly higher and the required doses of antigen were lower, when mice had been preimmunized with a commercial whole virus influenza vaccine. After preimmunization with the influenza vaccine, SPf66-IRIV elicited far more consistently anti-SPf66 antibody responses than SPf(66)n adsorbed to alum. MoAb produced by four B cell hybridoma clones derived from a SPf66-IRIV-immunized mouse cross-reacted with Plasmodium falciparum blood stage parasites in immunofluorescence assays. All four MoAbs were specific for the merozoite surface protein-1 (MSP-1)-derived 83.1 portion of SPf66. Sequencing of their functionally rearranged kappa light chain variable region genes demonstrated that the four hybridomas were generated from clonally related splenic B cells. Biomolecular interaction analyses (BIA) together with these sequencing data provided evidence for the selection of somatically mutated affinity-matured B cells upon repeated immunization with SPf66-IRIV. The results indicate that IRIV are a suitable delivery system for synthetic peptide vaccines and thus have a great potential for the design of molecularly defined combined vaccines targeted against multiple antigens and development stages of one parasite, as well as against multiple pathogens.
authors.affiliation: Swiss Tropical Institute, Basel.
authors.forename: F
authors.initials: F
authors.lastname: Pöltl-Frank
authors.forename: R
authors.initials: R
authors.lastname: Zurbriggen
authors.forename: A
authors.initials: A
authors.lastname: Helg
authors.forename: F
authors.initials: F
authors.lastname: Stuart
authors.forename: J
authors.initials: J
authors.lastname: Robinson
authors.forename: R
authors.initials: R
authors.lastname: Glück
authors.forename: G
authors.initials: G
authors.lastname: Pluschke
mesh_terms: D000595:Amino Acid Sequence; D000818:Animals; D000911:Antibodies, Monoclonal / Q000276:immunology; D000913:Antibodies, Protozoan / Q000276:immunology; D001483:Base Sequence; D003429:Cross Reactions; D018076:DNA, Complementary; D016503:Drug Delivery Systems; D019267:Hemagglutinin Glycoproteins, Influenza Virus; D009980:Influenza A virus; D008081:Liposomes; D017780:Malaria Vaccines / Q000008:administration & dosage / Q000276:immunology*; D051379:Mice; D008807:Mice, Inbred BALB C; D008969:Molecular Sequence Data; D010455:Peptides / Q000276:immunology; D010963:Plasmodium falciparum / Q000276:immunology*; D015800:Protozoan Proteins / Q000276:immunology*; D011994:Recombinant Proteins; D014407:Tumor Cells, Cultured; D014614:Vaccines, Synthetic / Q000008:administration & dosage / Q000276:immunology*
chemical_list: D000911:Antibodies, Monoclonal; D000913:Antibodies, Protozoan; D018076:DNA, Complementary; D019267:Hemagglutinin Glycoproteins, Influenza Virus; D008081:Liposomes; D017780:Malaria Vaccines; D010455:Peptides; D015800:Protozoan Proteins; D011994:Recombinant Proteins; C066269:SPf66 protein, Plasmodium; D014614:Vaccines, Synthetic