Secretory-IgA antibodies play an important role in the immunity to Streptococcus pneumoniae

Academic Article


  • 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 PspAplus a plasmid expressing Flt3 ligand (pFL) cDNAas 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. Copyright © 2010 by The American Association of Immunologists, Inc. -/-
  • Published In

    Digital Object Identifier (doi)

    Author List

  • Fukuyama Y; King JD; Kataoka K; Kobayashi R; Gilbert RS; Oishi K; Hollingshead SK; Briles DE; Fujihashi K
  • Start Page

  • 1755
  • End Page

  • 1762
  • Volume

  • 185
  • Issue

  • 3