title: Notch signaling at later stages of NK cell development enhances KIR expression and functional maturation.
abstract: The Notch signaling pathway plays a substantial role in human NK cell development. However, the role of Notch on killer Ig-like receptor (KIR) upregulation and acquisition of effector function has not been explored. To evaluate how Notch influences terminal differentiation, cord blood-derived NK cells or sorted peripheral blood NK cells were cultured with IL-15 for 7 d with inhibitory or activating Notch signals. Inhibition of Notch signaling significantly decreased KIR expression, whereas activation enhanced it. Overexpression of activated Notch on cord blood-derived NK cells resulted in a 2-fold increase in KIR expression, indicating that Notch signaling plays a direct, cell-intrinsic role in KIR regulation. Moreover, Notch-mediated KIR expression on NK cells is regulated through cis inhibition by delta-like ligand 1. Notch signaling also enhances CD16 upregulation that precedes KIR expression. Concomitant with the upregulation of KIR and CD16, Notch signaling induces increased cytolytic effector capacity and cytokine secretion, even in posttransplant samples in which NK cell function is inherently defective. Given these attributes of Notch signaling, we propose that Notch agonists may enhance NK cell maturation and tumor killing in a posttransplant setting.
authors.affiliation: Division of Hematology, Oncology, and Transplantation, Department of Medicine, University of Minnesota, Minneapolis, MN 55455.
authors.forename: Martin
authors.initials: M
authors.lastname: Felices
authors.affiliation: Division of Hematology, Oncology, and Transplantation, Department of Medicine, University of Minnesota, Minneapolis, MN 55455.
authors.forename: Dave E M
authors.initials: DE
authors.lastname: Ankarlo
authors.affiliation: Division of Hematology, Oncology, and Transplantation, Department of Medicine, University of Minnesota, Minneapolis, MN 55455.
authors.forename: Todd R
authors.initials: TR
authors.lastname: Lenvik
authors.affiliation: Division of Hematology, Oncology, and Transplantation, Department of Medicine, University of Minnesota, Minneapolis, MN 55455.
authors.forename: Heather H
authors.initials: HH
authors.lastname: Nelson
authors.affiliation: Division of Hematology, Oncology, and Transplantation, Department of Medicine, University of Minnesota, Minneapolis, MN 55455.
authors.forename: Bruce R
authors.initials: BR
authors.lastname: Blazar
authors.affiliation: Division of Hematology, Oncology, and Transplantation, Department of Medicine, University of Minnesota, Minneapolis, MN 55455.
authors.forename: Michael R
authors.initials: MR
authors.lastname: Verneris
authors.affiliation: Division of Hematology, Oncology, and Transplantation, Department of Medicine, University of Minnesota, Minneapolis, MN 55455 mille011@umn.edu.
authors.forename: Jeffrey S
authors.initials: JS
authors.lastname: Miller
mesh_terms: D002135:Calcium-Binding Proteins; D016207:Cytokines / Q000276:immunology; D005260:Female; D058851:GPI-Linked Proteins / Q000276:immunology; D005786:Gene Expression Regulation / Q000276:immunology*; D006801:Humans; D036341:Intercellular Signaling Peptides and Proteins / Q000276:immunology; D020014:K562 Cells; D007694:Killer Cells, Natural / Q000166:cytology / Q000276:immunology*; D008297:Male; D008565:Membrane Proteins / Q000276:immunology; D017452:Receptors, IgG / Q000276:immunology; D054340:Receptors, KIR / Q000276:immunology*; D051880:Receptors, Notch / Q000276:immunology*; D015398:Signal Transduction / Q000276:immunology*
chemical_list: D002135:Calcium-Binding Proteins; D016207:Cytokines; C512941:DLK1 protein, human; C428200:FCGR3B protein, human; D058851:GPI-Linked Proteins; D036341:Intercellular Signaling Peptides and Proteins; D008565:Membrane Proteins; D017452:Receptors, IgG; D054340:Receptors, KIR; D051880:Receptors, Notch