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J. Exp. Med.,
Volume 186, Number 12, December 15, 1997 1957-1963
Is Essential for Activation Signal
through NKR-P1 (CD161) in Natural Killer (NK)
Cells and NK1.1+ T Cells
By

From the * Division of Molecular Genetics, Center for Biological Science, Chiba University School of
Medicine, Chiba 260, Japan; and the Natural killer (NK) cells exhibit cytotoxicity against variety of tumor cells and virus-infected cells
without prior sensitization and represent unique lymphocytes involved in primary host defense. NKR-P1 is thought to be one of NK receptors mediating activation signals because cross-linking of NKR-P1 activates NK cells to exhibit cytotoxicity and IFN-
Department of Immunology, Juntendo University School of
Medicine, Tokyo 113, Japan
production. However,
molecular mechanism of NK cell activation via NKR-P1 is not well elucidated. In this study,
we analyzed the cell surface complex associated with NKR-P1 on NK cells and found that
NKR-P1 associates with the FcR
chain which is an essential component of Fc receptors for IgG
and IgE. The association between FcR
and NKR-P1 is independent of Fc receptor complexes. Furthermore, NK cells from FcR
-deficient mice did not show cytotoxicity or IFN-
production upon NKR-P1 cross-linking. Similarly, NK1.1+ T cells from FcR
-deficient mice
did not produce IFN-
upon NKR-P1 crosslinking. These findings demonstrate that the
FcR
chain plays an important role in activation of NK cells via the NKR-P1 molecule.
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