title: The effect of adjuvants on the immune response induced by a DBL4ɛ-ID4 VAR2CSA based Plasmodium falciparum vaccine against placental malaria.
abstract: A vaccine protecting women against placental malaria could be based on the sub-domains of the VAR2CSA antigen, since antibodies against the DBL4ɛ-ID4 subunit of the VAR2CSA protein can inhibit parasite binding to the placental ligand chondroitin sulphate A (CSA). Here we tested the ability of DBL4ɛ-ID4 to induce binding-inhibitory antibodies when formulated with adjuvants approved for human use. We have characterized the immune response of DBL4ɛ-ID4 in combination with Freund's complete and incomplete adjuvant and with three adjuvants currently being used in clinical trials: Montanide(®) ISA 720, Alhydrogel(®) and CAF01. Antibodies induced against DBL4ɛ-ID4 in combination with these adjuvants inhibited parasite binding to CSA from 82% to 99%. Although, different epitope recognition patterns were obtained for the different formulations, all adjuvant combinations induced strong Th1 and Th2 type responses, resulting in IgG with similar binding strength, with to the DBL4ɛ-ID4 antigen. These results demonstrate that the DBL4ɛ-ID4 antigen is highly immunogenic and that binding inhibitory antibodies are induced when formulated with any of the tested adjuvants.
authors: Centre for Medical Parasitology, Department of International Health, University of Copenhagen, CSS, Øster Farimagsgade 5 A, DK-1014 Copenhagen K, Denmark. vvp@sund.ku.dk
authors: V V
authors: VV
authors: Pinto
authors: A
authors: A
authors: Salanti
authors: L M
authors: LM
authors: Joergensen
authors: M
authors: M
authors: Dahlbäck
authors: M
authors: M
authors: Resende
authors: S B
authors: SB
authors: Ditlev
authors: E M
authors: EM
authors: Agger
authors: D E
authors: DE
authors: Arnot
authors: T G
authors: TG
authors: Theander
authors: M A
authors: MA
authors: Nielsen
mesh_terms: D000276:Adjuvants, Immunologic / Q000008:administration & dosage*; D000818:Animals; D000913:Antibodies, Protozoan / Q000097:blood; D000953:Antigens, Protozoan / Q000276:immunology*; D002448:Cell Adhesion; D002809:Chondroitin Sulfates / Q000378:metabolism; D004195:Disease Models, Animal; D005260:Female; D017780:Malaria Vaccines / Q000008:administration & dosage / Q000276:immunology*; D016778:Malaria, Falciparum / Q000517:prevention & control*; D010922:Placenta Diseases / Q000517:prevention & control*; D011247:Pregnancy; D051381:Rats; D017208:Rats, Wistar
chemical_list: D000276:Adjuvants, Immunologic; D000913:Antibodies, Protozoan; D000953:Antigens, Protozoan; D017780:Malaria Vaccines; C512601:VAR2CSA protein, Plasmodium falciparum; D002809:Chondroitin Sulfates