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Human NK cells and subsets of T cells or NKT cells express the orphan C-type lectin receptor CD161 (NKR-P1A) of unknown function. In contrast to rodents that possess several NKR-P1 genes coding for either activating or inhibitory receptors, the nature of signals delivered by the single human NKR-P1A receptor is still to be clarified. In this article, we show that the lectin-like transcript 1 (LLT1) molecule is a ligand for the CD161 receptor. Engagement of CD161 on NK cells with LLT1 expressed on target cells inhibited NK cell-mediated cytotoxicity and IFN-gamma secretion. Conversely, LLT1/CD161 interaction in the presence of a TCR signal enhanced IFN-gamma production by T cells. These findings identify a novel ligand/receptor pair that differentially regulate NK and T cell functions.

Cutting Edge: Lectin-Like Transcript 1 Is a Ligand for the CD161 Receptor