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J. Exp. Med.,
Volume 189, Number 3, February 1, 1999 493-500
By


From the * Department of Medicine, University of California San Francisco, San Francisco, California
94143, and the Veterans Administration Medical Center, San Francisco, California 94121; the Although activation of natural killer (NK) cytotoxicity is generally inhibited by target major
histocompatibility complex (MHC) class I expression, subtle features of NK allorecognition suggest that NK cells possess receptors that are activated by target MHC I. The mouse Ly-49D
receptor has been shown to activate NK cytotoxicity, although recognition of MHC class I has
not been demonstrated previously. To define Ly-49D-ligand interactions, we transfected the
mouse Ly-49D receptor into the rat NK line, RNK-16 (RNK.mLy-49D). As expected, anti-
Ly-49D monoclonal antibody 12A8 specifically stimulated redirected lysis of the Fc receptor- bearing rat target YB2/0 by RNK.mLy-49D transfectants. RNK.mLy-49D effectors were
tested against YB2/0 targets transfected with the mouse MHC I alleles H-2Dd, Db, Kk, or Kb.
RNK.mLy-49D cells lysed YB2/0.Dd targets more efficiently than untransfected YB2/0 or
YB2/0 transfected with Db, Kk, or Kb. This augmented lysis of H-2Dd targets was specifically
inhibited by F(ab')2 anti-Ly-49D (12A8) and F(ab')2 anti-H-2Dd (34-5-8S). RNK.mLy-49D
effectors were also able to specifically lyse Concanavalin A blasts isolated from H-2d mice
(BALB/c, B10.D2, and DBA/2) but not from H-2b or H-2k mice. These experiments show
that the activating receptor Ly-49D specifically interacts with the MHC I antigen, H-2Dd,
demonstrating the existence of alloactivating receptors on murine NK cells.
Laboratory of Experimental Immunology, National Cancer Institute-Frederick Cancer Research and
Development Center, Frederick, Maryland 21702; and the § Department of Microbiology and
Immunology, University of California San Francisco, San Francisco, California 94143
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