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Cutting Edge |


*
Department of Molecular Microbiology and Immunology and Graduate Program in Pathobiology, Division of Biology and Medicine, Brown University, Providence, RI 02912; and
Gemini Science, San Diego, CA 92121
The killer cell lectin-like receptor G1 (KLRG1) is the mouse
homolog of the rat mast cell function-associated Ag and contains an
immunoreceptor tyrosine-based inhibitory motif in its cytoplasmic
domain. In this study we demonstrate that both pathogenic and
nonpathogenic in vivo activation of NK cells induces the expression of
KLRG1 on their cell surface. Upon infection with murine CMV, this
induction peaks between days 5 and 7 with
90% of the NK cells
expressing KLRG1. On day 1.5 post-murine CMV infection of C57BL/6 mice,
the main producers of IFN-
are the KLRG1-negative NK cells. This
effect has been recapitulated in vitro as we show that engagement of
KLRG1 on a transfected NK cell line inhibits both cytokine
production and NK cell-mediated cytotoxicity. Taken together, these
data illustrate the crucial role played by KLRG1 during the termination
of mouse NK cell activation.
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