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Streptococcus pneumoniae antigens are good candidates for mucosal vaccines.
2002 DEC 18 - (NewsRx.com & NewsRx.net) -- by Maria G. Essig, MS, ELS, senior medical writer - Results of in vitro studies indicate that virulence proteins of Streptococcus pneumoniae are strongly antigenic in the upper respiratory tract of children, according to a report in Infection and Immunity.
Qibo Zhang and colleagues at the University of Bristol in Great Britain isolated adenoidal lymphocytes from 20 children who had undergone adenoidectomies and used the cells in a series of immunoassays to test the antigenicity of pneumolysin, pneumococcal surface protein A (PspA), pneumococcal surface antigen A (PsaA), and choline-binding protein A (CbpA).
When the lymphocytes were cultured in the presence of a supernatant from pneumococcus type 14 strain that secreted the four pneumococcal proteins, cells that secreted antibodies specific to each antigen were detected by ELISpot (Immune responses to novel pneumococcal proteins pneumolysin, PspA, PsaA, and CbpA in adenoidal B cells from children. Infect Immun, 2002;70(10):5363-5369).
The investigators found significantly higher levels of cells that produced anti-PsaA and anti-CbpA IgG antibodies compared with levels of cells that produced IgG antibodies against PspA and pneumolysin (p
The density of adenoidal cells secreting IgA antibodies specific for CbpA and PsaA was significantly greater than that found for cells secreting anti-pneumolysin IgA antibodies (p
Stimulation of the cultured adenoidal cells with the pneumococcus supernatant caused significant proliferation of the cells that produced anti-PspA, anti-PsaA, and anti-CbpA IgG antibodies. However, a greater ...
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Source: HighBeam Research, Streptococcus pneumoniae antigens are good candidates for mucosal...