Deamidated gliadin peptides form epitopes that transglutaminase antibodies recognize
2008 (English)In: Journal of Pediatric Gastroenterology and Nutrition - JPGN, ISSN 0277-2116, Vol. 46, no 3, 253-261 p.Article in journal (Refereed) Published
OBJECTIVE: Deamidated gliadin peptides are efficient antigens in diagnostic tests for celiac disease, and results correlate better with transglutaminase 2-based assays than those with native gliadin. We investigated whether deamidated gliadin antigens are structurally similar to transglutaminase 2 or could mimic transglutaminase epitopes. PATIENTS AND METHODS: Serum samples from 74 celiac and 65 control patients, and 13 different transglutaminase 2-specific monoclonal mouse antibodies were investigated for their binding to commercially available deamidated gliadin peptides using enzyme-linked immunosorbent assay, competition studies, and molecular modelling. RESULTS: The enzyme-linked immunosorbent assay with deamidated gliadin peptides had 100% sensitivity and 98.5% specificity in patients. Deamidated gliadin epitopes also were recognized by 3 transglutaminase-specific monoclonal antibodies, and antibodies affinity-purified with deamidated gliadin peptides from celiac patient sera reacted with transglutaminase but did not show endomysial binding. The binding of the monoclonal antibodies to deamidated gliadin was inhibited dose dependently by full-length recombinant human transglutaminase, its fragments containing the binding sites of these monoclonal antibodies, or by celiac patient antibodies. Deamidated gliadin peptides decreased the binding of transglutaminase-specific monoclonal antibodies to transglutaminase. Three different cross-reacting transglutaminase epitopes were found, of which 2 are located in the C-terminal domain and 1 is conformational. The binding of celiac serum samples to deamidated gliadin peptides could not be abolished by transglutaminase or by any of the transglutaminase-specific monoclonals, indicating that celiac sera also contain additional antibodies to gliadin epitopes different from transglutaminase. CONCLUSIONS: Certain deamidated gliadin-derived peptides and transglutaminase 2 epitopes have similar 3-dimensional appearance. This homology may contribute to the induction of transglutaminase autoantibodies by molecular mimicry.
Place, publisher, year, edition, pages
2008. Vol. 46, no 3, 253-261 p.
antibody epitopes, celiac disease, deamidated gliadin peptides, molecular mimicry, transglutaminase antibody
Medical and Health Sciences
IdentifiersURN: urn:nbn:se:uu:diva-105064DOI: 10.1097/MPG.0b013e31815ee555ISI: 000253551300004PubMedID: 18376241OAI: oai:DiVA.org:uu-105064DiVA: diva2:220437