The Journal of Experimental Medicine
StemCell Technologies
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Published online 6 February 2006 doi:10.1084/jem.20051986
Rockefeller University Press, 0022-1007 $8.00
JEM, Volume 203, Number 2, 289-295
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BRIEF DEFINITIVE REPORT

Killer cell lectin-like receptor G1 binds three members of the classical cadherin family to inhibit NK cell cytotoxicity

Masayuki Ito, Takuma Maruyama, Naotoshi Saito, Satoru Koganei, Kazuo Yamamoto, and Naoki Matsumoto

Department of Integrated Biosciences, Graduate School of Frontier Sciences, The University of Tokyo, Kashiwa, 277-8562 Chiba, Japan

CORRESPONDENCE Naoki Matsumoto: nmatsu{at}k.u-tokyo.ac.jp

Killer cell lectin-like receptor G1 (KLRG1) is an inhibitory receptor expressed on subsets of natural killer (NK) cells and T cells, for which no endogenous ligands are known. Here, we show that KLRG1 binds three of the classical cadherins (E-, N-, and R-), which are ubiquitously expressed in vertebrates and mediate cell–cell adhesion by homotypic or heterotypic interactions. By expression cloning using the mouse KLRG1 tetramer as a probe, we identified human E-cadherin as a xenogeneic ligand. We also identified a syngeneic interaction between mouse KLRG1 and mouse E-cadherin. Furthermore, we show that KLRG1 binds N- and R-cadherins. Finally, we demonstrate that E-cadherin binding of KLRG1 prevents the lysis of E-cadherin–expressing targets by KLRG1+ NK cells. These results suggest that KLRG1 ligation by E-, N-, or R-cadherins may regulate the cytotoxicity of killer cells to prevent damage to tissues expressing the cadherins.



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