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Department of Pathology, University of Texas Southwestern Medical Center, Dallas, TX 75235;
Laboratory of Experimental Immunology, Division of Basic Sciences, National Cancer Institute, Frederick Cancer Research and Development Center, Frederick, MD 21702; and
Human Health Research Center, Institut National de la Reserche Scientifique-Institute Armand-Frappier, University of Quebec, Laval, Canada
Class I-specific stimulatory and inhibitory receptors expressed by NK cell subsets contribute to the alloreactive potential of the self-tolerant murine NK cell repertoire. In this report, we have studied potential mechanisms of tolerance to the function of the positive signaling Ly49D receptor in mice that express one of its ligands, H2-Dd. Our results demonstrate that H2-Dd-expressing mice possess a large Ly49D+ subset of NK cells that is functionally capable of rejecting bone marrow cell (BMC) allografts in vivo and lysing allogeneic Con A lymphoblasts in vitro. Also, we show that the Ly49D receptor is responsible for the ability of H2b/d F1 hybrid mice to reject H2d/d parental BMC (hybrid resistance). Thus, deletion or anergy of Ly49D+ cells in H2-Dd+ hosts cannot explain self tolerance. Our functional studies revealed that coexpression of the Dd-specific Ly49A or Ly49G2 inhibitory receptors by Ly49D+ cells resulted in tolerance to Dd+ targets, while coexpression of Kb-specific inhibitory receptors Ly49C/I resulted in tolerance to Kb+ targets. Only in H2d/d cells did Ly49C/I dominantly inhibit Ly49D-Dd stimulation. This correlated with an increased mean fluorescence intensity of Ly49C expression, as well as an increased percentage of Ly49C+ cells in the Ly49D+A/G2- compartment. Therefore, we conclude that self tolerance of the Ly49D subset can be achieved through coexpression of a sufficient level of self-specific inhibitory receptors.
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