A Ligand for the Murine NK Activation Receptor Ly-49D: Activation of Tolerized NK Cells from β2-Microglobulin- Deficient Mice

• Published in: The Journal of immunology (1950) Vol. 169; no. 1; pp. 126 - 136
• Main Authors: Furukawa, Hiroshi, Iizuka, Koho, Poursine-Laurent, Jennifer, Shastri, Nilabh, Yokoyama, Wayne M.
• Format: Journal Article
• Language: English
• Published: 01.07.2002
• ISSN: 0022-1767; 1550-6606
• DOI: 10.4049/jimmunol.169.1.126

Abstract Mouse NK cells express inhibitory NK receptors that recognize target cell MHC class I molecules and activation receptors that are less well defined. The Ly-49D activation receptor on C57BL/6 NK cells recognizes Chinese hamster ovary cells and triggers natural killing. In this study, we demonstrate that a Chinese hamster classical MHC class I molecule is the ligand for Ly-49D in a reporter gene assay system as well as in NK cell killing assays. Ly-49D recognizes the Chinese hamster class I molecule better when it is expressed with Chinese hamster β2-microglobulin (β2m) than murine β2m. However, it is still controversial that Ly-49D recognizes H-2Dd, as we were unable to demonstrate the specificity previously reported. Using this one ligand-one receptor recognition system, function of an NK activation receptor was, for the first time, investigated in NK cells that are tolerized in β2m-deficient mice. Surprisingly, Ly-49D-killing activity against ligand-expressing targets was observed with β2m-deficient mouse NK cells, albeit reduced, even though “tolerized” function of Ly-49D was expected. These results indicate that Ly-49D specifically recognizes the Chinese hamster MHC class I molecule associated with Chinese hamster β2m, and indicate that the Ly-49D NK cell activation receptor is not tolerized in β2m deficiency.