Abstract
CD1d-restricted invariant natural killer T cell (iNKT cells) have a limited T cell receptor (TCR) repertoire and share characteristics common to T cells and natural killer cells. While intrathymic selection facilitates the production of T cells carrying self major histocompatibility complex–restricted TCRs, natural killer cells carry an appropriate repertoire of self major histocompatibility complex–recognizing receptors to avoid self-reactivity. Here we show that chronic exposure to specific glycolipid antigen resulted in iNKT cell disappearance and thymus-dependent repopulation of iNKT cells with increased expression of inhibitory Ly-49 molecules that resulted in impaired responsiveness. Thymic selection of peripheral Ly-49-expressing iNKT cell repertoire inhibited cytokine production and other functions in vivo. These observations emphasize the acquisition of self-recognizing inhibitory receptors on NKT cells as a previously unknown mechanism of thymic tolerance after chronic antigen exposure.
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Acknowledgements
We thank M. Kronenberg and K. Takeda for discussions; R. Cameron and the staff of the Peter MacCallum Cancer Centre for their maintenance and care of the mice in this project; and A. Uldrich and D. Pellicci for their technical assistance. Supported by Cancer Research Institute (Y.H.), Cancer Council of Victoria (N.Y.C.) and National Health and Medical Research Council of Australia (M.J.S. and D.I.G.).
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Hayakawa, Y., Berzins, S., Crowe, N. et al. Antigen-induced tolerance by intrathymic modulation of self-recognizing inhibitory receptors. Nat Immunol 5, 590–596 (2004). https://doi.org/10.1038/ni1069
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DOI: https://doi.org/10.1038/ni1069