4.7 Article

Staphylococcal enterotoxin B-derived haptens promote sensitization

期刊

CELLULAR & MOLECULAR IMMUNOLOGY
卷 10, 期 1, 页码 78-83

出版社

CHIN SOCIETY IMMUNOLOGY
DOI: 10.1038/cmi.2012.32

关键词

intestine; food allergy; hapten; microbial products; immunization

资金

  1. Canadian Institute of Health Research (CIHR) [191063, 220058]
  2. Natural Sciences, Engineering Research Council of Canada (NSERC) [371268]
  3. CIHR [177843]

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T helper 2 (Th2) polarization is a major pathological feature in allergic diseases; its etiology is not fully understood. This study aims to elucidate the adjuvant effect of the microbial product-derived small peptides in the initiation of antigen-specific Th2 polarization. In this study, a clinical survey of patients with chronic rhinosinusitis (CRS) and food allergy (FA) was carried out. The Staphylococcal enterotoxin B (SEB)-derived small peptides (Ssps) were examined in the human stool extracts. The formation of Ssp/antigen adducts was tested in a protein-protein combination assay. The bone marrow-derived dendritic cells (BMDCs) were employed to test the role of Ssp/ovalbumin (OVA) adducts in the dendritic cell (DC) maturation. A mouse model was developed to test the role of Ssp/OVA adducts in the initiation of Th2 polarization in the intestine. The results showed that 54 (18.2%) patients with FA were diagnosed among 296 patients with SEB+ CRS; only eight (2.9%) FA patients were identified among 272 patients with SEB 2 CRS. Ssps were detected in the stool protein extracts from FA patients with SEB+ CRS, but not in those with SEB- CRS. Ssp/OVA adducts induced DC maturation, speeded up DC migration, activated CD4(+) T cells in the regional lymph nodes and induced skewed Th2 polarization in the local tissue. We conclude that patients with SEB+ CRS are prone to suffering from FA. SEB- can be degraded to Ssps in the gastrointestinal tract. The Ssps can bind macromolecular antigens to form adducts to promote the antigenicity of the antigens and induction of the antigen-specific Th2 polarization and inflammation in the local tissue. Cellular & Molecular Immunology (2013) 10, 78-83; doi:10.1038/cmi.2012.32; published online 3 September 2012

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