کد مقاله | کد نشریه | سال انتشار | مقاله انگلیسی | نسخه تمام متن |
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2406580 | 1103086 | 2007 | 9 صفحه PDF | دانلود رایگان |
Collagen-binding protein (CNA) is the major Staphylococcus aureus adhesin responsible for high affinity binding to collagen and is assumed to be a major virulence factor in infection and disease. Mutants lacking the cna gene are less virulent than the parent strain in models of septic arthritis, osteomyelitis, keratinitis, and endocarditis. In order to investigate the immunological and protective properties of a CNA-based DNA vaccine, a eukaryotic expression vector pCNA was constructed which expressed the collagen-binding domain of this adhesin in transfected cells. Three groups of 11 Balb/c mice received three injection of either pCNA, the empty expression vector (pCI) or PBS. Those injected with pCNA showed hi titre (64 000) antibody and evidence of a cell-mediated immune response (CMI). The anti-CNA antibodies recognized the intact bacteria and prevented binding to collagen in vitro. However, the vaccination did not protect against bacterial challenge using the intra-peritoneal route of infection. Moreover, S. aureus that had been treated with sera from vaccinated mice caused a more severe infection than bacteria treated with sera from non-vaccinated mice. In summary, DNA vaccination against CNA produced a strong antibody and cellular response in mice but failed to protect from i.p. infection by S. aureus.
Journal: Vaccine - Volume 25, Issue 27, 28 June 2007, Pages 5053–5061