title: Secretory-IgA antibodies play an important role in the immunity to Streptococcus pneumoniae.
abstract: This study was designed to investigate whether secretory-IgA (S-IgA) Abs induced by a pneumococcal surface protein A (PspA)-based nasal vaccine are necessary for prevention of streptococcal colonization. Mice nasally immunized with PspA plus a plasmid expressing Flt3 ligand (pFL) cDNA as a mucosal adjuvant showed significantly higher levels of PspA-specific S-IgA and IgG Ab responses in both plasma and nasal washes when compared with naive mice. Although IgA(-/-) mice given nasal PspA plus pFL had significantly high levels of PspA-specific IgG Abs, high numbers of CFUs were detected in nasal washes and nasal passages. In contrast, vaccinated wild-type mice showed essentially no bacteria in the nasal cavity. Further, a nasal vaccine consisting of PspA plus pFL effectively reduced pre-existing Streptococcus pneumoniae in the nasal cavity. These results show that PspA-based vaccine-induced specific S-IgA Abs play a necessary role in the regulation of S. pneumoniae colonization in the nasal cavity.
authors.affiliation: Department of Pediatric Dentistry, Immunobiology Vaccine Center, Institute of Oral Health Research, University of Alabama at Birmingham, SDB 801A1, 1919 7th Avenue South, Birmingham, AL 35294-0007, USA.
authors.forename: Yoshiko
authors.initials: Y
authors.lastname: Fukuyama
authors.forename: Janice D
authors.initials: JD
authors.lastname: King
authors.forename: Kosuke
authors.initials: K
authors.lastname: Kataoka
authors.forename: Ryoki
authors.initials: R
authors.lastname: Kobayashi
authors.forename: Rebekah S
authors.initials: RS
authors.lastname: Gilbert
authors.forename: Kazunori
authors.initials: K
authors.lastname: Oishi
authors.forename: Susan K
authors.initials: SK
authors.lastname: Hollingshead
authors.forename: David E
authors.initials: DE
authors.lastname: Briles
authors.forename: Kohtaro
authors.initials: K
authors.lastname: Fujihashi
mesh_terms: D000276:Adjuvants, Immunologic / Q000008:administration & dosage / Q000235:genetics; D000281:Administration, Intranasal; D000818:Animals; D000907:Antibodies, Bacterial / Q000096:biosynthesis / Q000502:physiology*; D001426:Bacterial Proteins / Q000008:administration & dosage / Q000235:genetics / Q000276:immunology*; D001428:Bacterial Vaccines / Q000008:administration & dosage / Q000235:genetics / Q000276:immunology; D002478:Cells, Cultured; D015169:Colony Count, Microbial; D005260:Female; D007113:Immunity, Innate / Q000235:genetics; D007071:Immunoglobulin A, Secretory / Q000096:biosynthesis / Q000235:genetics / Q000502:physiology*; D008565:Membrane Proteins / Q000008:administration & dosage / Q000096:biosynthesis / Q000235:genetics / Q000276:immunology; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D013290:Streptococcal Infections / Q000276:immunology / Q000382:microbiology / Q000517:prevention & control*
chemical_list: D000276:Adjuvants, Immunologic; D000907:Antibodies, Bacterial; D001426:Bacterial Proteins; D001428:Bacterial Vaccines; D007071:Immunoglobulin A, Secretory; D008565:Membrane Proteins; C084881:flt3 ligand protein; C051592:pneumococcal surface protein A