Autoimmunity-associated T cell receptors recognize HLA-B*27-bound peptides

Nature. 2022 Dec;612(7941):771-777. doi: 10.1038/s41586-022-05501-7. Epub 2022 Dec 7.

Abstract

Human leucocyte antigen B*27 (HLA-B*27) is strongly associated with inflammatory diseases of the spine and pelvis (for example, ankylosing spondylitis (AS)) and the eye (that is, acute anterior uveitis (AAU))1. How HLA-B*27 facilitates disease remains unknown, but one possible mechanism could involve presentation of pathogenic peptides to CD8+ T cells. Here we isolated orphan T cell receptors (TCRs) expressing a disease-associated public β-chain variable region-complementary-determining region 3β (BV9-CDR3β) motif2-4 from blood and synovial fluid T cells from individuals with AS and from the eye in individuals with AAU. These TCRs showed consistent α-chain variable region (AV21) chain pairing and were clonally expanded in the joint and eye. We used HLA-B*27:05 yeast display peptide libraries to identify shared self-peptides and microbial peptides that activated the AS- and AAU-derived TCRs. Structural analysis revealed that TCR cross-reactivity for peptide-MHC was rooted in a shared binding motif present in both self-antigens and microbial antigens that engages the BV9-CDR3β TCRs. These findings support the hypothesis that microbial antigens and self-antigens could play a pathogenic role in HLA-B*27-associated disease.

Publication types

  • Research Support, Non-U.S. Gov't
  • Research Support, N.I.H., Extramural
  • Research Support, U.S. Gov't, Non-P.H.S.

MeSH terms

  • Amino Acid Motifs
  • Autoantigens / chemistry
  • Autoantigens / immunology
  • Autoantigens / metabolism
  • Autoimmunity*
  • CD8-Positive T-Lymphocytes / immunology
  • CD8-Positive T-Lymphocytes / metabolism
  • Cross Reactions
  • HLA-B Antigens* / immunology
  • HLA-B Antigens* / metabolism
  • Humans
  • Peptide Library
  • Peptides* / chemistry
  • Peptides* / immunology
  • Peptides* / metabolism
  • Receptors, Antigen, T-Cell* / chemistry
  • Receptors, Antigen, T-Cell* / immunology
  • Receptors, Antigen, T-Cell* / metabolism
  • Spondylitis, Ankylosing / immunology
  • Synovial Fluid / immunology
  • Uveitis, Anterior / immunology

Substances

  • Autoantigens
  • HLA-B Antigens
  • Peptides
  • Receptors, Antigen, T-Cell
  • Peptide Library