title: Synthetic oligodeoxynucleotide containing CpG motif induces an anti-polysaccharide type 1-like immune response after immunization of mice with Haemophilus influenzae type b conjugate vaccine.
abstract: Synthetic oligodeoxynucleotides containing CpG motifs [immunostimulatory sequences (ISS)] have been described as potent adjuvants of type 1 immune responses when co-administered with protein or peptide vaccines. To investigate their role in the immune response to polysaccharides (CHO), different preparations of anti-Haemophilus influenzae type b (Hib) conjugate vaccine were administered to mice. The unconjugated CHO did not induce the synthesis of specific antibodies even in the presence of ISS. On the other hand, anti-CHO-specific antibodies significantly increased in the presence of ISS, when tetanus (TT) or diphtheria [cross-reacting material (CRM)] toxoid-conjugated CHO were used to immunize mice. The adjuvant effect was also observed for the immune response against the carrier protein (TT and CRM). ISS insured an early and long-lasting specific IgG production. The effects of ISS on the anti-CHO immune response could be attributed to the amplification of the T help provided by the carrier. The analysis of anti-CHO IgG subclasses showed a significant increase of IgG2a and IgG3 in the presence of ISS. ISS caused a rapid release of IL-12 and IFN-gamma in sera from treated mice. This data provide a first evidence for the ability of ISS to induce an anti-CHO type 1-like immune response and demonstrate that ISS have the potential to increase host antibody response against both the CHO and the protein component of a conjugated vaccine.
authors.affiliation: Laboratorio di Batteriologia e Micologia Medica, Istituto Superiore di Sanità, Viale Regina Elena 299, 00161 Roma, Italy.
authors.forename: C
authors.initials: C
authors.lastname: von Hunolstein
authors.forename: R
authors.initials: R
authors.lastname: Teloni
authors.forename: S
authors.initials: S
authors.lastname: Mariotti
authors.forename: S
authors.initials: S
authors.lastname: Recchia
authors.forename: G
authors.initials: G
authors.lastname: Orefici
authors.forename: R
authors.initials: R
authors.lastname: Nisini
mesh_terms: D000276:Adjuvants, Immunologic / Q000494:pharmacology*; D000818:Animals; D000907:Antibodies, Bacterial / Q000096:biosynthesis*; D016667:Bacterial Capsules; D018899:CpG Islands; D016207:Cytokines / Q000378:metabolism; D004168:Diphtheria Toxoid / Q000276:immunology; D004337:Drug Carriers; D005260:Female; D018073:Haemophilus Vaccines / Q000276:immunology*; D007114:Immunization; D007074:Immunoglobulin G / Q000096:biosynthesis* / Q000276:immunology; D051379:Mice; D008807:Mice, Inbred BALB C; D009838:Oligodeoxyribonucleotides / Q000276:immunology*; D011135:Polysaccharides, Bacterial / Q000276:immunology*; D013745:Tetanus Toxoid / Q000276:immunology; D018417:Th1 Cells / Q000276:immunology*
chemical_list: D000276:Adjuvants, Immunologic; D000907:Antibodies, Bacterial; D016207:Cytokines; D004168:Diphtheria Toxoid; D004337:Drug Carriers; D018073:Haemophilus Vaccines; C055753:Haemophilus influenza type b polysaccharide vaccine-tetanus toxin conjugate; C044237:Haemophilus influenzae type b polysaccharide vaccine; C052180:Haemophilus influenzae type b-polysaccharide vaccine-diphtheria toxoid conjugate; D007074:Immunoglobulin G; D009838:Oligodeoxyribonucleotides; D011135:Polysaccharides, Bacterial; D013745:Tetanus Toxoid