title: Qa-1(b)-dependent modulation of dendritic cell and NK cell cross-talk in vivo.
abstract: Dendritic cells (DC) trigger activation and IFN-gamma release by NK cells in lymphoid tissues, a process important for the polarization of Th1 responses. Little is known about the molecular signals that regulate DC-induced NK cell IFN-gamma synthesis. In this study, we analyzed whether the interaction between Qa-1(b) expressed on DC and its CD94/NKG2A receptor on NK cells affects this process. Activation of DC using CpG-oligodeoxynucleotides in Qa-1(b)-deficient mice, or transfer of CpG-oligodeoxynucleotide-activated Qa-1(b)-deficient DC into wild-type mice, resulted in dramatically increased IFN-gamma production by NK cells, as compared with that induced by Qa-1(b)-expressing DC. Masking the CD94/NKG2A inhibitory receptor on NK cells in wild-type mice similarly enhanced the IFN-gamma response of these cells to Qa-1(b)-expressing DC. Furthermore, NK cells from CD94/NKG2A-deficient mice displayed higher IFN-gamma production upon DC stimulation. These results demonstrate that Qa-1(b) is critically involved in regulating IFN-gamma synthesis by NK cells in vivo through its interaction with CD94/NKG2A inhibitory receptors. This receptor-ligand interaction may be essential to prevent unabated cytokine production by NK cells during an inflammatory response.
authors: Department of Pathology, Stanford University School of Medicine, Palo Alto, CA 94304, USA. paucol@stanford.edu
authors: Paula
authors: P
authors: Colmenero
authors: Angela L
authors: AL
authors: Zhang
authors: Ting
authors: T
authors: Qian
authors: Linrong
authors: L
authors: Lu
authors: Harvey
authors: H
authors: Cantor
authors: Kalle
authors: K
authors: Söderström
authors: Edgar G
authors: EG
authors: Engleman
mesh_terms: D048868:Adaptor Proteins, Signal Transducing; D000818:Animals; D002135:Calcium-Binding Proteins; D002352:Carrier Proteins / Q000378:metabolism; D002450:Cell Communication / Q000276:immunology*; D002465:Cell Movement; D002478:Cells, Cultured; D003713:Dendritic Cells / Q000166:cytology / Q000276:immunology* / Q000378:metabolism*; D015395:Histocompatibility Antigens Class I / Q000235:genetics / Q000276:immunology* / Q000378:metabolism*; D007371:Interferon-gamma / Q000096:biosynthesis; D007694:Killer Cells, Natural / Q000276:immunology* / Q000378:metabolism*; D008198:Lymph Nodes / Q000166:cytology / Q000276:immunology; D051379:Mice; D018345:Mice, Knockout; D051920:NK Cell Lectin-Like Receptor Subfamily D / Q000235:genetics / Q000378:metabolism; D015854:Up-Regulation
chemical_list: D048868:Adaptor Proteins, Signal Transducing; D002135:Calcium-Binding Proteins; D002352:Carrier Proteins; D015395:Histocompatibility Antigens Class I; D051920:NK Cell Lectin-Like Receptor Subfamily D; C521558:Nkd2 protein, mouse; C032907:Q surface antigens; D007371:Interferon-gamma