T cell receptor cross-reactivity between gliadin and bacterial peptides in celiac disease
Details
Publication Year 2020-01, Volume 27, Issue #1, Page 49-61
Journal Title
Nature Structural & Molecular Biology
Publication Type
Journal Article
Abstract
The human leukocyte antigen (HLA) locus is strongly associated with T cell-mediated autoimmune disorders. HLA-DQ2.5-mediated celiac disease (CeD) is triggered by the ingestion of gluten, although the relative roles of genetic and environmental risk factors in CeD is unclear. Here we identify microbially derived mimics of gliadin epitopes and a parental bacterial protein that is naturally processed by antigen-presenting cells and activated gliadin reactive HLA-DQ2.5-restricted T cells derived from CeD patients. Crystal structures of T cell receptors in complex with HLA-DQ2.5 bound to two distinct bacterial peptides demonstrate that molecular mimicry underpins cross-reactivity toward the gliadin epitopes. Accordingly, gliadin reactive T cells involved in CeD pathogenesis cross-react with ubiquitous bacterial peptides, thereby suggesting microbial exposure as a potential environmental factor in CeD.
WEHI Research Division(s)
Immunology
PubMed ID
31873306
NHMRC Grants
NHMRC/1113293
Rights Notice
Refer to copyright notice on published article.


Creation Date: 2020-01-21 11:05:28
Last Modified: 2020-02-10 05:19:16
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