title: Selective inhibition of human and mouse natural killer tumor recognition using retroviral antisense in primary natural killer cells: involvement with MHC class I killer cell inhibitory receptors.
abstract: The natural killer tumor recognition (NK-TR) protein has been shown to be a necessary component for the killing of NK-sensitive and virus-infected targets by the rat RNK-16 cell line. Class I-recognizing killer cell inhibitory receptors (KIR) have been found in the human (p58; NKAT family) and mouse (Ly-49 family). The principal functional characteristic of these receptors is their ability to block NK cell lysis by recognition of selected class I molecules on target cells. In the present study, we examined whether abrogation of NK-TR expression by retroviral infection of primary human or mouse NK cells with virus-producing antisense NK-TR also would demonstrate loss of non-MHC-restricted killing and whether the NK-TR was associated with KIR function in humans or with Ly-49 in the mouse. Using short term culture of fresh human or mouse NK cells, antisense NK-TR-treated NK cells demonstrated strong selective reduction of NK cytotoxicity. NK-TR was necessary for lytic activity even when KIR function was blocked by Ab in experiments involving NK3.3 lysis of HLA.cw3-expressing targets or killing of Dd targets by Ly-49A+ or Ly-49G2+ mouse NK cells. These studies extend our previous studies in rat NK cell lines to demonstrate that primary mouse and human NK cells require NK-TR for non-MHC-restricted lysis of tumor and virus-infected targets. In addition, the reversal of KIR or Ly-49 inhibition of NK cell lysis requires NK-TR expression for cellular killing in both human and mouse.
authors.affiliation: Laboratory of Experimental Immunology, National Cancer Institute, Frederick, MD 21702, USA.
authors.forename: J R
authors.initials: JR
authors.lastname: Ortaldo
authors.forename: A T
authors.initials: AT
authors.lastname: Mason
authors.forename: L H
authors.initials: LH
authors.lastname: Mason
authors.forename: R T
authors.initials: RT
authors.lastname: Winkler-Pickett
authors.forename: P
authors.initials: P
authors.lastname: Gosselin
authors.forename: S K
authors.initials: SK
authors.lastname: Anderson
mesh_terms: D000818:Animals; D001798:Blood Proteins / Q000502:physiology*; D003602:Cytotoxicity, Immunologic; D006183:H-2 Antigens / Q000276:immunology; D015236:HLA-C Antigens / Q000276:immunology; D015395:Histocompatibility Antigens Class I / Q000276:immunology*; D006801:Humans; D007111:Immunity, Cellular; D007694:Killer Cells, Natural / Q000276:immunology*; D051379:Mice; D008810:Mice, Inbred C57BL; D009369:Neoplasms / Q000276:immunology*; D016372:RNA, Antisense; D011971:Receptors, Immunologic / Q000276:immunology*; D055607:Receptors, Natural Killer Cell; D014162:Transfection
chemical_list: D001798:Blood Proteins; D006183:H-2 Antigens; D015236:HLA-C Antigens; C038653:HLA-C*03 antigen; D015395:Histocompatibility Antigens Class I; D016372:RNA, Antisense; D011971:Receptors, Immunologic; D055607:Receptors, Natural Killer Cell