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J. Exp. Med.,
Volume 187, Number 10, May 18, 1998 1681-1687
By


From the * Department of Immunobiology, DNAX Institute of Molecular and Cell Biology, Palo Alto,
California 94304; the Natural killer (NK) cells have been implicated in early immune responses against certain viruses, including cytomegalovirus (CMV). CMV causes downregulation of class I major histocompatibility complex (MHC) expression in infected cells; however, it has been proposed that
a class I MHC homolog encoded by CMV, UL18, may act as a surrogate ligand to prevent NK
cell lysis of CMV-infected cells. In this study, we examined the role of UL18 in NK cell recognition and lysis using fibroblasts infected with either wild-type or UL18 knockout CMV virus,
and by using cell lines transfected with the UL18 gene. In both systems, the expression of
UL18 resulted in the enhanced killing of target cells. We also show that the enhanced killing is
due to both UL18-dependent and -independent mechanisms, and that the killer cell inhibitory
receptors (KIRs) and CD94/NKG2A inhibitory receptors for MHC class I do not play a role
in affecting susceptibility of CMV-infected fibroblasts to NK cell-mediated cytotoxicity.
Division of Biology 156-29 and Howard Hughes Medical Institute,
California Institute of Technology, Pasadena, California 91125; and the § Department of Microbiology
and Immunology, Stanford University, Stanford, California 94305
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