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Staphylococcus aureus fibronectin-binding protein specifically binds IgE from patients with atopic dermatitis and requires antigen presentation for cellular immune responses.
J. Allergy Clin. Immunol. 128, 82-91 (2011)
BACKGROUND: Staphylococcus aureus superinfections occur in more than 90% of patients with atopic dermatitis (AD) and aggravate skin inflammation. S aureus toxins lead to tissue damage and augment T-cell-mediated skin inflammation by a superantigen effect. OBJECTIVE: To characterize IgE-reactive proteins from S aureus. METHODS: A genomic S aureus library was screened with IgE from patients with AD for DNA clones coding for IgE-reactive antigens. One was identified as fibronectin-binding protein (FBP). Recombinant FBP was expressed in Escherichia coli, purified, and tested for specific IgE reactivity in patients with AD. Its allergenic activity was studied in basophil activation experiments and T-cell cultures. The in vivo allergenic activity was investigated by sensitizing mice. RESULTS: Using IgE from patients with AD for screening of a genomic S aureus library, an IgE-reactive DNA clone was isolated that coded for FBP. Recombinant FBP was expressed in E coli and purified. It reacted specifically with IgE from patients with AD and exhibited allergenic activity in basophil degranulation assays. FBP showed specific T-cell reactivity requiring antigen presentation and induced the secretion of proinflammatory cytokines from PBMCs. Mice sensitized with FBP mounted FBP-specific IgE responses, showed FBP-specific basophil degranulation as well as FBP-specific T-cell proliferation, and mixed T(h)2/T(h)1 cytokine secretion. CONCLUSION: Evidence is provided that specific humoral and cellular immune responses to S aureus antigens dependent on antigen presentation represent a novel mechanism for S aureus-induced skin inflammation in AD. Furthermore, FBP may be used for the development of novel diagnostic and therapeutic strategies for S aureus infections.
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Publikationstyp
Artikel: Journalartikel
Dokumenttyp
Wissenschaftlicher Artikel
Sprache
englisch
Veröffentlichungsjahr
2011
HGF-Berichtsjahr
0
ISSN (print) / ISBN
0091-6749
e-ISSN
1097-6825
Zeitschrift
The journal of allergy and clinical immunology
Quellenangaben
Band: 128,
Heft: 1,
Seiten: 82-91
Verlag
Elsevier
Verlagsort
Amsterdam [u.a.]
Begutachtungsstatus
Peer reviewed
Institut(e)
Institute for Allergy Research (IAF)
PubMed ID
21513970
Erfassungsdatum
2011-12-31