title: A requirement for CD45 distinguishes Ly49D-mediated cytokine and chemokine production from killing in primary natural killer cells.
abstract: Engagement of receptors on the surface of natural killer (NK) cells initiates a biochemical cascade ultimately triggering cytokine production and cytotoxicity, although the interrelationship between these two outcomes is currently unclear. In this study we investigate the role of the cell surface phosphatase CD45 in NK cell development and intracellular signaling from activating receptors. Stimulation via the major histocompatibility complex I-binding receptor, Ly49D on CD45(-/-) primary NK cells resulted in the activation of phosphoinositide-3-kinase and normal cytotoxicity but failed to elicit a range of cytokines and chemokines. This blockage is associated with impaired phosphorylation of Syk, Vav1, JNK, and p38, which mimics data obtained using inhibitors of the src-family kinases (SFK). These data, supported by analogous findings after CD16 and NKG2D stimulation of CD45(-/-) primary NK cells, place CD45 upstream of SFK in NK cells after stimulation via immunoreceptor tyrosine-based activation motif-containing receptors. Thus we identify CD45 as a pivotal enzyme in eliciting a precise subset of NK cell responses.
authors.affiliation: The Walter and Eliza Hall Institute of Medical Research, Parkville, Victoria 3050, Australia. huntington@wehi.edu.au
authors.forename: Nicholas D
authors.initials: ND
authors.lastname: Huntington
authors.forename: Yuekang
authors.initials: Y
authors.lastname: Xu
authors.forename: Stephen L
authors.initials: SL
authors.lastname: Nutt
authors.forename: David M
authors.initials: DM
authors.lastname: Tarlinton
mesh_terms: D000818:Animals; D000950:Antigens, Ly / Q000276:immunology / Q000378:metabolism*; D018797:Cell Cycle Proteins / Q000378:metabolism; D002478:Cells, Cultured; D018925:Chemokines / Q000378:metabolism*; D016207:Cytokines / Q000378:metabolism*; D003601:Cytotoxicity Tests, Immunologic; D004792:Enzyme Precursors / Q000378:metabolism; D004797:Enzyme-Linked Immunosorbent Assay; D005434:Flow Cytometry; D047468:Immunoprecipitation; D047908:Intracellular Signaling Peptides and Proteins; D048031:JNK Mitogen-Activated Protein Kinases / Q000378:metabolism; D007694:Killer Cells, Natural / Q000276:immunology / Q000378:metabolism*; D037181:Lectins, C-Type; D017493:Leukocyte Common Antigens / Q000276:immunology / Q000378:metabolism*; D048670:MAP Kinase Kinase 4; D051379:Mice; D008810:Mice, Inbred C57BL; D018345:Mice, Knockout; D020929:Mitogen-Activated Protein Kinase Kinases / Q000378:metabolism; D055650:NK Cell Lectin-Like Receptor Subfamily A; D019869:Phosphatidylinositol 3-Kinases / Q000378:metabolism; D010766:Phosphorylation; D011505:Protein-Tyrosine Kinases / Q000378:metabolism; D011518:Proto-Oncogene Proteins / Q000378:metabolism; D051567:Proto-Oncogene Proteins c-vav; D055630:Receptors, NK Cell Lectin-Like; D015398:Signal Transduction / Q000276:immunology*; D000072377:Syk Kinase; D048051:p38 Mitogen-Activated Protein Kinases / Q000378:metabolism
chemical_list: D000950:Antigens, Ly; D018797:Cell Cycle Proteins; D018925:Chemokines; D016207:Cytokines; D004792:Enzyme Precursors; D047908:Intracellular Signaling Peptides and Proteins; C527092:Klra4 protein, mouse; D037181:Lectins, C-Type; D055650:NK Cell Lectin-Like Receptor Subfamily A; D011518:Proto-Oncogene Proteins; D051567:Proto-Oncogene Proteins c-vav; D055630:Receptors, NK Cell Lectin-Like; C496619:Vav1 protein, mouse; D019869:Phosphatidylinositol 3-Kinases; D011505:Protein-Tyrosine Kinases; D000072377:Syk Kinase; C000606897:Syk protein, mouse; D048031:JNK Mitogen-Activated Protein Kinases; D048051:p38 Mitogen-Activated Protein Kinases; D048670:MAP Kinase Kinase 4; D020929:Mitogen-Activated Protein Kinase Kinases; D017493:Leukocyte Common Antigens