Abstract
Natural killer T cells expressing 'invariant' T cell receptor α-chains (TCRα chains) containing variable (V) and joining (J) region Vα14-Jα18 (Vα14i) rearrangements recognize both endogenous and microbial glycolipids in the context of CD1d. How cells expressing an invariant TCRα chain and a restricted set of TCRβ chains recognize structurally diverse antigens is not clear. Here we show that a Vα14i TCR recognized many α-linked glycolipids by means of a 'hot-spot' of germline-encoded amino acids in complementarity-determining regions 3α, 1α and 2β. This hot-spot did not shift during the recognition of structurally distinct antigens, suggesting that the Vα14i TCR functions as a pattern-recognition receptor, conferring on natural killer T cells the ability to sense and respond in an innate way to pathogens displaying antigenic α-linked glycolipids.
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Acknowledgements
We thank J. Cambier, P. Henson, E. Huseby and R. Torres for discussions and comments on the manuscript; J. Loomis for assistance with flow cytometry; and the National Institutes of Health core facility for CD1d tetramers. The GSL-1′ compound was provided by M. Kronenberg and Y. Kinjo (La Jolla Institute for Allergy and Immunology); the mouse stem cell virus–based retroviral plasmids with a human nerve growth factor reporter were provided by S. Reiner (University of Pennsylvania); and B78hi cells were provided by H. Levitski (Johns Hopkins University). Supported by the National Institutes of Health (AI057485 to L.G., AI18785 to P.M. and AI17134 to J.K.), the Howard Hughes Medical Institute (P.M. and J.K.), the Australian Research Council Federation (J.R.), the National Health and Medical Research Council (J.M. and J.R.; Peter Doherty Fellowship to N.A.B.), the Cancer Council of Victoria (J.M. and J.R.) and the American Cancer Society (J.L.M.).
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J.P.S.-B., J.L.M., T.M. and L.G. did the experimental work and analysis and prepared the manuscript; J.W., N.A.B., J.M. and J.R. provided reagents and crystallographic data; and J.P.S.-B., J.K., P.M. and L.G. devised the project, analyzed the data and wrote the manuscript.
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Scott-Browne, J., Matsuda, J., Mallevaey, T. et al. Germline-encoded recognition of diverse glycolipids by natural killer T cells. Nat Immunol 8, 1105–1113 (2007). https://doi.org/10.1038/ni1510
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DOI: https://doi.org/10.1038/ni1510
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