Abstract:
:Coeliac disease probably results from a T-cell response to wheat gliadin and is associated to HLA-DQ2. No gliadin epitopes recognized by intestinal T cells have yet been identified, limiting our understanding of the pathogenesis. Gut-lesion-derived DQ2-restricted T cells from coeliac disease patients were used to identify an epitope within a purified gamma-type gliadin. The structure of the epitope was characterized by mass spectrometry and verified by synthesis. The epitope (QPQQSFPEQQ) results from deamidation of a distinct glutamine in the native structure. This deamidation is important for binding to DQ2 and T-cell recognition. Other gut-derived T cells fail to recognize the epitope, although deamidation of unfractionated gliadin enhances the response of all gut-derived DQ2-restricted T cells isolated from several patients. Several DQ2-restricted T-cell epitopes exist, but for all of them deamidation of glutamine residues appears to be critical for creation of active epitopes. Native gliadin has few negatively charged residues but is very rich in glutamine. After deamidation gliadin becomes a rich source of DQ2 epitopes thus providing a link between DQ2, gliadin and coeliac disease. The necessity for modification may have general immunological relevance.
journal_name
Scand J Immunoljournal_title
Scandinavian journal of immunologyauthors
Sjöström H,Lundin KE,Molberg O,Körner R,McAdam SN,Anthonsen D,Quarsten H,Norén O,Roepstorff P,Thorsby E,Sollid LMdoi
10.1046/j.1365-3083.1998.00397.xsubject
Has Abstractpub_date
1998-08-01 00:00:00pages
111-5issue
2eissn
0300-9475issn
1365-3083journal_volume
48pub_type
杂志文章abstract::Spleen effector cells for IgG- and IgM-induced antibody-dependent cellular cytotoxicity (ADCC) were characterized with respect to density and cell surface markers by using sheep erythrocytes (SRBC) coated with hybridoma-derived monoclonal anti-SRBC IgG or anti-SRBC IgM antibodies as targets. While basically the same e...
journal_title:Scandinavian journal of immunology
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journal_title:Scandinavian journal of immunology
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journal_title:Scandinavian journal of immunology
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journal_title:Scandinavian journal of immunology
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journal_title:Scandinavian journal of immunology
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journal_title:Scandinavian journal of immunology
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journal_title:Scandinavian journal of immunology
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journal_title:Scandinavian journal of immunology
pub_type: 杂志文章
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更新日期:1983-07-01 00:00:00
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journal_title:Scandinavian journal of immunology
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journal_title:Scandinavian journal of immunology
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更新日期:1987-02-01 00:00:00
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journal_title:Scandinavian journal of immunology
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更新日期:1977-01-01 00:00:00
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journal_title:Scandinavian journal of immunology
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journal_title:Scandinavian journal of immunology
pub_type: 杂志文章
doi:10.1111/j.1365-3083.1981.tb00121.x
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journal_title:Scandinavian journal of immunology
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journal_title:Scandinavian journal of immunology
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journal_title:Scandinavian journal of immunology
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journal_title:Scandinavian journal of immunology
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更新日期:2001-05-01 00:00:00
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pub_type: 杂志文章
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