title: p110gamma and p110delta phosphoinositide 3-kinase signaling pathways synergize to control development and functions of murine NK cells.
abstract: Phosphoinositide 3-kinases (PI-3Ks) are key enzymes for cell development, activation, and survival. Here we showed that PI-3K class IB and class IA catalytic subunits, p110gamma and p110delta, played a crucial role in the development and functions of murine NK cells. p110gamma deficiency and impairment of G protein-coupled receptor (GPRC) signaling prevented full NK cell maturation. Concomitant loss of p110gamma and p110delta exacerbated this defect, resulting in a very small population of NK cells with a highly immature phenotype in the bone marrow and periphery. Moreover, combined p110gamma and p110delta signals were required for cytotoxicity and activation of the kinase ERK during NK cell-target cell interaction. p110gamma played a major role in receptor-induced interferon-gamma (IFN-gamma) production through a pathway that involved the kinase ERK and 5-Lipoxigenase, which most likely generates lipid mediators activating GPRCs. Conversely, PI3Ks negatively regulated interleukin-12 (IL-12) and IL-18-induced IFN-gamma by modulating p38 kinase activation. Our data shed light on the multiple intersecting pathways through which PI3Ks control NK cell-mediated innate responses.
authors.affiliation: Department of Pathology and Immunology, Washington University School of Medicine, St. Louis, MO 63110, USA.
authors.forename: Ilaria
authors.initials: I
authors.lastname: Tassi
authors.forename: Marina
authors.initials: M
authors.lastname: Cella
authors.forename: Susan
authors.initials: S
authors.lastname: Gilfillan
authors.forename: Isaiah
authors.initials: I
authors.lastname: Turnbull
authors.forename: Thomas G
authors.initials: TG
authors.lastname: Diacovo
authors.forename: Josef M
authors.initials: JM
authors.lastname: Penninger
authors.forename: Marco
authors.initials: M
authors.lastname: Colonna
mesh_terms: D000818:Animals; D001094:Arachidonate 5-Lipoxygenase / Q000378:metabolism; D058534:Class I Phosphatidylinositol 3-Kinases; D003602:Cytotoxicity, Immunologic; D007113:Immunity, Innate; D007371:Interferon-gamma / Q000378:metabolism; D018664:Interleukin-12 / Q000378:metabolism; D020382:Interleukin-18 / Q000378:metabolism; D007694:Killer Cells, Natural / Q000201:enzymology / Q000276:immunology*; D008213:Lymphocyte Activation; D051379:Mice; D019950:Mitogen-Activated Protein Kinase 1 / Q000378:metabolism; D048052:Mitogen-Activated Protein Kinase 3 / Q000378:metabolism; D019869:Phosphatidylinositol 3-Kinases / Q000235:genetics / Q000378:metabolism*; D015398:Signal Transduction; D048051:p38 Mitogen-Activated Protein Kinases / Q000378:metabolism
chemical_list: D020382:Interleukin-18; D018664:Interleukin-12; D007371:Interferon-gamma; D001094:Arachidonate 5-Lipoxygenase; D019869:Phosphatidylinositol 3-Kinases; C509622:1-phosphatidylinositol 3-kinase p110 subunit, mouse; D058534:Class I Phosphatidylinositol 3-Kinases; C421683:Pik3cd protein, mouse; D019950:Mitogen-Activated Protein Kinase 1; D048052:Mitogen-Activated Protein Kinase 3; D048051:p38 Mitogen-Activated Protein Kinases