Broad CD8+T cell cross-recognition of distinct influenza A strains in humans.Grant, E.J., Josephs, T.M., Loh, L., Clemens, E.B., Sant, S., Bharadwaj, M., Chen, W., Rossjohn, J., Gras, S., Kedzierska, K.
(2018) Nat Commun 9: 5427-5427
- PubMed: 30575715
- DOI: 10.1038/s41467-018-07815-5
- Primary Citation of Related Structures:
6MT6, 6MT5, 6MT4, 6MT3, 6MTM, 6MTL
- PubMed Abstract:
Newly-emerged and vaccine-mismatched influenza A viruses (IAVs) result in a rapid global spread of the virus due to minimal antibody-mediated immunity. In that case, established CD8 + T-cells can reduce disease severity. However, as mutat ...
Newly-emerged and vaccine-mismatched influenza A viruses (IAVs) result in a rapid global spread of the virus due to minimal antibody-mediated immunity. In that case, established CD8 + T-cells can reduce disease severity. However, as mutations occur sporadically within immunogenic IAV-derived T-cell peptides, understanding of T-cell receptor (TCRαβ) cross-reactivity towards IAV variants is needed for a vaccine design. Here, we investigate TCRαβ cross-strain recognition across IAV variants within two immunodominant human IAV-specific CD8 + T-cell epitopes, HLA-B*37:01-restricted NP 338-346 (B37-NP 338 ) and HLA-A*01:01-restricted NP 44-52 (A1-NP 44 ). We find high abundance of cross-reactive TCRαβ clonotypes recognizing distinct IAV variants. Structures of the wild-type and variant peptides revealed preserved conformation of the bound peptides. Structures of a cross-reactive TCR-HLA-B37-NP 338 complex suggest that the conserved conformation of the variants underpins TCR cross-reactivity. Overall, cross-reactive CD8 + T-cell responses, underpinned by conserved epitope structure, facilitates recognition of distinct IAV variants, thus CD8 + T-cell-targeted vaccines could provide protection across different IAV strains.
Department of Microbiology and Immunology, The University of Melbourne, at the Peter Doherty Institute for Infection and Immunity, Melbourne, VIC, 3010, Australia. email@example.com.