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http://purl.uniprot.org/citations/17324966http://www.w3.org/1999/02/22-rdf-syntax-ns#typehttp://purl.uniprot.org/core/Journal_Citation
http://purl.uniprot.org/citations/17324966http://www.w3.org/2000/01/rdf-schema#comment"

Objective

To test whether HLA-DR alleles influence the production of particular autoantibodies in rheumatoid arthritis (RA) patients, we screened synovial proteins with sera of RA patients homozygous for different HLA-DR alleles by using 2D blots. We found that sera of RA patients homozygous for HLA-DRB1*0404 recognised a 100-kDa synovial protein identified as calpastatin. We studied B and T cell epitopes on calpastatin and their association with HLA-DRB1*0404.

Methods

The frequency of positive sera in patients expressing different RA-associated HLA-DR allele combinations was calculated by inhouse ELISA using purified synovial calpastatin or calpastatin peptides encompassing the entire calpastatin protein as immunosorbent. Interaction between calpastatin peptides and HLA-DR alleles was tested by a direct binding assay. T cell responses to calpastatin were measured in RA patients and controls.

Results

We found that RA-associated HLA-DR alleles are associated with presence of autoantibodies to synovial calpastatin in RA patients' sera. HLA-DRB1*0404 is strongly associated with antisynovial calpastatin in RA sera. One linear B cell epitope is preferentially associated with HLA-DRB1*0404. Multiple peptides from calpastatin bind every tested HLA-DR allele associated or not with RA. Peptides from domain 1 and 4 of calpastatin are the best HLA-DR allele binders. The T cell response to calpastatin is frequent in RA patients and independent of the HLA-DR background.

Conclusions

HLA-DRB1*0404 is strongly associated with anticalpastatin antibodies in rheumatoid arthritis."xsd:string
http://purl.uniprot.org/citations/17324966http://purl.org/dc/terms/identifier"doi:10.1136/ard.2006.067231"xsd:string
http://purl.uniprot.org/citations/17324966http://purl.uniprot.org/core/author"Roudier J."xsd:string
http://purl.uniprot.org/citations/17324966http://purl.uniprot.org/core/author"Roudier C."xsd:string
http://purl.uniprot.org/citations/17324966http://purl.uniprot.org/core/author"Guis S."xsd:string
http://purl.uniprot.org/citations/17324966http://purl.uniprot.org/core/author"Balandraud N."xsd:string
http://purl.uniprot.org/citations/17324966http://purl.uniprot.org/core/author"Auger I."xsd:string
http://purl.uniprot.org/citations/17324966http://purl.uniprot.org/core/date"2007"xsd:gYear
http://purl.uniprot.org/citations/17324966http://purl.uniprot.org/core/name"Ann Rheum Dis"xsd:string
http://purl.uniprot.org/citations/17324966http://purl.uniprot.org/core/pages"1588-1593"xsd:string
http://purl.uniprot.org/citations/17324966http://purl.uniprot.org/core/title"HLA-DRB1*0404 is strongly associated with anticalpastatin antibodies in rheumatoid arthritis."xsd:string
http://purl.uniprot.org/citations/17324966http://purl.uniprot.org/core/volume"66"xsd:string
http://purl.uniprot.org/citations/17324966http://www.w3.org/2004/02/skos/core#exactMatchhttp://purl.uniprot.org/pubmed/17324966
http://purl.uniprot.org/citations/17324966http://xmlns.com/foaf/0.1/primaryTopicOfhttps://pubmed.ncbi.nlm.nih.gov/17324966
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