Systemic immunization with streptococcal immunoglobulin-binding protein Sib 35 induces protective immunity against group: a Streptococcus challenge in mice.
The streptococcal immunoglobulin (Ig)-binding protein Sib 35 binds to IgG, IgM and IgA in human, mouse and bovine. Since all group A Streptococcus pyogenes (GAS) strains examined express the sib 35 gene, we evaluated the Sib 35 as a vaccine candidate against GAS infections. We detected significantly higher anti-Sib 35 IgG antibody titers in sera from patients with GAS infections than from healthy volunteers. Immunization of mice with Sib 35 induced antigen-specific IgG antibodies in their sera, and rabbit Sib 35-specific antiserum showed opsonic activity. Immunization with Sib 35 enhanced survival rates in mice challenged with a GAS strain, while exhibiting no toxicity in hosts. We conclude that Sib 35 is a promising vaccine for prevention of GAS infections.
Department of Oral and Molecular Microbiology, Osaka University Graduate School of Dentistry, 1-8 Yamada-oka, Suita-Osaka 565-0871, Japan.
Shigefumi
S
Okamoto
Yasuharu
Y
Tamura
Yutaka
Y
Terao
Shigeyuki
S
Hamada
Shigetada
S
Kawabata
D000293:Adolescent; D000328:Adult; D000818:Animals; D000907:Antibodies, Bacterial / Q000097:blood; D001425:Bacterial Outer Membrane Proteins / Q000276:immunology*; D004797:Enzyme-Linked Immunosorbent Assay; D005260:Female; D006801:Humans; D007074:Immunoglobulin G / Q000097:blood; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D008809:Mice, Inbred C3H; D008810:Mice, Inbred C57BL; D009895:Opsonin Proteins / Q000097:blood; D010587:Phagocytosis; D011817:Rabbits; D013290:Streptococcal Infections / Q000517:prevention & control*; D022541:Streptococcal Vaccines / Q000008:administration & dosage / Q000276:immunology*; D013297:Streptococcus pyogenes / Q000276:immunology
D000907:Antibodies, Bacterial; D001425:Bacterial Outer Membrane Proteins; D007074:Immunoglobulin G; D009895:Opsonin Proteins; C508570:Sib35 protein, Streptococcus pyogenes; D022541:Streptococcal Vaccines