Abstract:
:Mucosal-associated invariant T (MAIT) cells are thought to detect microbial antigens presented by the HLA-Ib molecule MR1 through the exclusive use of a TRAV1-2-containing TCRα. Here we use MR1 tetramer staining and ex vivo analysis with mycobacteria-infected MR1-deficient cells to demonstrate the presence of functional human MR1-restricted T cells that lack TRAV1-2. We characterize an MR1-restricted clone that expresses the TRAV12-2 TCRα, which lacks residues previously shown to be critical for MR1-antigen recognition. In contrast to TRAV1-2(+) MAIT cells, this TRAV12-2-expressing clone displays a distinct pattern of microbial recognition by detecting infection with the riboflavin auxotroph Streptococcus pyogenes. As known MAIT antigens are derived from riboflavin metabolites, this suggests that TRAV12-2(+) clone recognizes unique antigens. Thus, MR1-restricted T cells can discriminate between microbes in a TCR-dependent manner. We postulate that additional MR1-restricted T-cell subsets may play a unique role in defence against infection by broadening the recognition of microbial metabolites.
journal_name
Nat Communjournal_title
Nature communicationsauthors
Meermeier EW,Laugel BF,Sewell AK,Corbett AJ,Rossjohn J,McCluskey J,Harriff MJ,Franks T,Gold MC,Lewinsohn DMdoi
10.1038/ncomms12506subject
Has Abstractpub_date
2016-08-16 00:00:00pages
12506issn
2041-1723pii
ncomms12506journal_volume
7pub_type
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