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- W2912424879 abstract "Primary biliary cholangitis (PBC) is an organ-specific, T cell-mediated autoimmune disease which is characterized by the breakdown of self-tolerance to the highly conserved pyruvate dehydrogenase complex, especially the pyruvate dehydrogenase E2 complex (PDC-E2). However, the molecular mechanism of breakdown of self-tolerance is still unclear.A combination of multiplex-PCR and immune repertoire sequencing (IR-seq) was used for a standardized analysis of memory T cell receptor (TCR) β-chain repertoire of PBC patient and healthy volunteers. In vitro induction and expansion of human PDC-E2163-176 (human PDC-E2)-specific T cells and E coli PDC-E231-44/134-147/235-248 (E coli PDC-E2)-specific T cells, and identified the human (and E coli) PDC-E2-specific TCRβ repertoire by IR-seq.Primary biliary cholangitis patients have shorter complementarity-determining region 3s (CDR3s), and higher degree of sequence overlap in the TCRβ repertoire of memory T cell. Moreover, altered insertion patterns and skewed TRBV segment usage were observed in PBC patients. With regard to the pathogenesis, the concentration of E coli was higher in PBC patients' faecal. The frequency of E coli (and human)-specific TCRs was higher in the memory TCRβ repertoire of PBC patients compared with healthy controls. Importantly, the TCRβ repertoire characteristics were almost identical between E coli PDC-E2-related TCRs and human PDC-E2-related TCRs, including the patterns of TRBV usage, CDR3 length and amino acid composition.Our findings comprehensively revealed the TCRβ repertoire characterization of PBC patients, and provided a TCR molecular basis to understand the mechanism of cross-recognition between human PDC-E2 and E coli PDC-E2, and the imbalance of immune tolerance in PBC." @default.
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- W2912424879 date "2019-02-24" @default.
- W2912424879 modified "2023-10-02" @default.
- W2912424879 title "<scp>TCR</scp> β repertoire of memory T cell reveals potential role for <i>Escherichia coli</i> in the pathogenesis of primary biliary cholangitis" @default.
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- W2912424879 doi "https://doi.org/10.1111/liv.14066" @default.
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