HLA A*24:02-restricted T-cell receptors cross recognise bacterial and preproinsulin peptides in type 1 diabetes

Dolton, Garry, Bulek, Anna, Wall, Aaron, Thomas, Hannah, Hopkins, Jade R, Rius, Cristina, Galloway, Sarah A.E., Whalley, Thomas, Tan, Li Rong, Morin, Theo, Omidvar, Nader, Fuller, Anna, Topley, Katie, Hasan, Samiul, Jain, Shika, D’Souza, Nirupa, Hodges-Hoyland, Tom, Spiller, Owen B. ORCID: https://orcid.org/0000-0002-9117-6911, Kronenberg-Versteeg, Deborah, Szomolay, Barbara ORCID: https://orcid.org/0000-0002-5375-5533, van den Berg, Hugo A., Jones, Lucy C. ORCID: https://orcid.org/0000-0002-3872-4376, Peakman, Mark, Cole, David K. ORCID: https://orcid.org/0000-0003-0028-9396, Rizkallah, Pierre J. ORCID: https://orcid.org/0000-0002-9290-0369 and Sewell, Andrew K. ORCID: https://orcid.org/0000-0003-3194-3135 2024. HLA A*24:02-restricted T-cell receptors cross recognise bacterial and preproinsulin peptides in type 1 diabetes. Journal of Clinical Investigation 134 (18) , e164535. 10.1172/JCI164535

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Abstract

CD8+ T cells destroy insulin-producing pancreatic β cells in type 1 diabetes through HLA class I–restricted presentation of self-antigens. Combinatorial peptide library screening was used to produce a preferred peptide recognition landscape for a patient-derived T cell receptor (TCR) that recognized the preproinsulin-derived (PPI-derived) peptide sequence LWMRLLPLL in the context of disease risk allele HLA A*24:02. Data were used to generate a strong superagonist peptide, enabling production of an autoimmune HLA A*24:02–peptide–TCR structure by crystal seeding. TCR binding to the PPI epitope was strongly focused on peptide residues Arg4 and Leu5, with more flexibility at other positions, allowing the TCR to strongly engage many peptides derived from pathogenic bacteria. We confirmed an epitope from Klebsiella that was recognized by PPI-reactive T cells from 3 of 3 HLA A*24:02+ patients. Remarkably, the same epitope selected T cells from 7 of 8 HLA A*24+ healthy donors that cross-reacted with PPI, leading to recognition and killing of HLA A*24:02+ cells expressing PPI. These data provide a mechanism by which molecular mimicry between pathogen and self-antigens could have resulted in the breaking of self-tolerance to initiate disease.

Item Type:	Article
Date Type:	Published Online
Status:	Published
Schools:	Medicine
Publisher:	American Society for Clinical Investigation
ISSN:	0021-9738
Funders:	Wellcome Trust, BBSRC
Date of First Compliant Deposit:	17 July 2024
Date of Acceptance:	25 June 2024
Last Modified:	15 Oct 2024 16:09
URI:	https://orca.cardiff.ac.uk/id/eprint/170364

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