title: Th1-directing adjuvants increase the immunogenicity of oligosaccharide-protein conjugate vaccines related to Streptococcus pneumoniae type 3.
abstract: Oligosaccharide (OS)-protein conjugates are promising candidate vaccines against encapsulated bacteria, such as Haemophilus influenzae, Neisseria meningitidis, and Streptococcus pneumoniae. Although the effects of several variables such as OS chain length and protein carrier have been studied, little is known about the influence of adjuvants on the immunogenicity of OS-protein conjugates. In this study, a minimal protective trisaccharide epitope of Streptococcus pneumoniae type 3 conjugated to the cross-reacting material of diphtheria toxin was used for immunization of BALB/c mice in the presence of different adjuvants. Subsequently, half of the mice received a booster immunization with conjugate alone. Independent of the use and type of adjuvant, all mice produced long-lasting anti-polysaccharide type 3 (PS3) antibody levels, which provided full protection against challenge with pneumococcal type 3 bacteria. All adjuvants tested increased the anti-PS3 antibody levels and opsonic capacities as measured by an enzyme-linked immunosorbent assay and an in vitro phagocytosis assay. The use of QuilA or a combination of the adjuvants CpG and dimethyl dioctadecyl ammonium bromide resulted in the highest phagocytic capacities and the highest levels of Th1-related immunoglobulin G (IgG) subclasses. Phagocytic capacity correlated strongly with Th1-associated IgG2a and IgG2b levels, to a lesser extent with Th2-associated IgG1 levels, and weakly with thiocyanate elution as a measure of avidity. Thus, the improved immunogenicity of OS-protein conjugates was most pronounced for Th1-directing adjuvants.
authors.affiliation: Vaccines Section, Eijkman-Winkler Institute for Microbiology, Infectious Diseases and Inflammation, University Medical Center, 3584 CX Utrecht, The Netherlands. D.J.Lefeber@lab.azu.nl
authors.forename: Dirk J
authors.initials: DJ
authors.lastname: Lefeber
authors.forename: Barry
authors.initials: B
authors.lastname: Benaissa-Trouw
authors.forename: Johannes F G
authors.initials: JF
authors.lastname: Vliegenthart
authors.forename: Johannis P
authors.initials: JP
authors.lastname: Kamerling
authors.forename: Wouter T M
authors.initials: WT
authors.lastname: Jansen
authors.forename: Kees
authors.initials: K
authors.lastname: Kraaijeveld
authors.forename: Harm
authors.initials: H
authors.lastname: Snippe
mesh_terms: D000276:Adjuvants, Immunologic / Q000494:pharmacology*; D000818:Animals; D000907:Antibodies, Bacterial / Q000097:blood; D000918:Antibody Specificity; D004168:Diphtheria Toxoid / Q000276:immunology*; D005260:Female; D007114:Immunization; D007117:Immunization, Secondary; D007074:Immunoglobulin G / Q000097:blood / Q000145:classification; D051379:Mice; D008807:Mice, Inbred BALB C; D009895:Opsonin Proteins; D010587:Phagocytosis; D011008:Pneumococcal Infections / Q000276:immunology / Q000517:prevention & control; D022242:Pneumococcal Vaccines / Q000008:administration & dosage / Q000276:immunology*; D011135:Polysaccharides, Bacterial / Q000276:immunology*; D013296:Streptococcus pneumoniae / Q000145:classification / Q000276:immunology; D018417:Th1 Cells / Q000276:immunology*; D018074:Vaccines, Conjugate / Q000008:administration & dosage / Q000276:immunology*
chemical_list: D000276:Adjuvants, Immunologic; D000907:Antibodies, Bacterial; D004168:Diphtheria Toxoid; D007074:Immunoglobulin G; D009895:Opsonin Proteins; D022242:Pneumococcal Vaccines; D011135:Polysaccharides, Bacterial; D018074:Vaccines, Conjugate; C026604:pneumococcal polysaccharide, type III