Abstract
The development and function of natural killer (NK) cells is regulated by the interaction of inhibitory receptors of the Ly49 family with distinct peptide-laden major histocompatibility complex (MHC) class I molecules, although whether the Ly49 family is able bind to other MHC class I–like molecules is unclear. Here we found that the prototypic inhibitory receptor Ly49A bound the highly conserved nonclassical MHC class I molecule H2-M3 with an affinity similar to its affinity for H-2Dd. The specific recognition of H2-M3 by Ly49A regulated the 'licensing' of NK cells and mediated 'missing-self' recognition of H2-M3-deficient bone marrow. Host peptide–H2-M3 was required for optimal NK cell activity against experimental metastases and carcinogenesis. Thus, nonclassical MHC class I molecules can act as cognate ligands for Ly49 molecules. Our results provide insight into the various mechanisms that lead to NK cell tolerance.
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Change history
19 November 2012
In the version of this article initially published, two designations for major histocompatibility complex molecules in the second subsection of Results are incorrect. The correct text should read "The affinity of AGPARAAAL-loaded H-2Dd for Ly49A (2.05 ± 0.07 μM; Fig. 2c) was similar to published values36. In contrast, we observed no interaction between Ly49A and SIINFEKL-loaded H-2Kb (Fig. 2d)...." The error has been corrected for HTML and PDF versions of this article.
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Acknowledgements
We thank C. Paget for critical analysis of the manuscript; E. Hawkins, Q. Mundrea, B. Venville, N. McLaughlin and J. Sharkey for technical assistance; and B. Murphy (UC Davis Cancer Center) for the YE1/32 antibody to Ly49A. Supported by the National Health and Medical Research Council of Australia (D.M.A., L.C.S., R.B., M.J.S., A.G.B. and J.R.), Cancer Australia, the Cure Cancer Australia Foundation, the US National Institutes of Health (AI040310 to C.-R.W.) and the Howard Hughes Medical Institute (W.M.Y.).
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D.M.A. conceived of, designed and did the experiments with assistance from L.C.S., N.B., C.J.C., R.B., C.L.C., H.H., J.L., S.V.W., J.P.-L. and M.J.S.; C.-R.W., A.A.S., W.M.Y., J.R., A.G.B. and M.J.S. provided reagents and critical input to the analysis of results; and D.M.A., L.C.S., J.R., A.G.B. and M.J.S. wrote the manuscript.
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Andrews, D., Sullivan, L., Baschuk, N. et al. Recognition of the nonclassical MHC class I molecule H2-M3 by the receptor Ly49A regulates the licensing and activation of NK cells. Nat Immunol 13, 1171–1177 (2012). https://doi.org/10.1038/ni.2468
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DOI: https://doi.org/10.1038/ni.2468
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