title: DNA-PKcs controls an endosomal signaling pathway for a proinflammatory response by natural killer cells.
abstract: Endosomes are emerging as specialized signaling compartments that endow receptors with distinct signaling properties. The diversity of endosomal signaling pathways and their contribution to various biological responses is still unclear. CD158d, which is also known as the killer cell immunoglobulin-like receptor (KIR) 2DL4 (KIR2DL4), is an endosome-resident receptor in natural killer (NK) cells that stimulates the release of a unique set of proinflammatory and proangiogenic mediators in response to soluble human leukocyte antigen G (HLA-G). Here, we identified the CD158d signaling cascade. In response to soluble agonist antibody or soluble HLA-G, signaling by CD158d was dependent on the activation of nuclear factor kappaB (NF-kappaB) and the serine-threonine kinase Akt. CD158d associated with the catalytic subunit of DNA-dependent protein kinase (DNA-PKcs), promoted the recruitment of Akt to endosomes, and stimulated the DNA-PKcs-dependent phosphorylation of Akt. The sequential requirement for DNA-PKcs, Akt, and NF-kappaB in signaling by CD158d delineates a previously uncharacterized endosomal signaling pathway for a proinflammatory response in NK cells.
authors.affiliation: Laboratory of Immunogenetics, National Institute of Allergy and Infectious Diseases, National Institutes of Health, Rockville, MD 20852, USA. sumi@nih.gov
authors.forename: Sumati
authors.initials: S
authors.lastname: Rajagopalan
authors.forename: Mark W
authors.initials: MW
authors.lastname: Moyle
authors.forename: Irma
authors.initials: I
authors.lastname: Joosten
authors.forename: Eric O
authors.initials: EO
authors.lastname: Long
mesh_terms: D002460:Cell Line; D051747:DNA-Activated Protein Kinase / Q000378:metabolism*; D004591:Electrophoresis, Polyacrylamide Gel; D011992:Endosomes / Q000378:metabolism* / Q000502:physiology; D006680:HLA Antigens / Q000378:metabolism; D059951:HLA-G Antigens; D015395:Histocompatibility Antigens Class I / Q000378:metabolism; D006801:Humans; D047468:Immunoprecipitation; D007249:Inflammation / Q000378:metabolism*; D007694:Killer Cells, Natural / Q000502:physiology*; D013058:Mass Spectrometry; D018613:Microscopy, Confocal; D016328:NF-kappa B / Q000378:metabolism; D010766:Phosphorylation; D051057:Proto-Oncogene Proteins c-akt / Q000378:metabolism; D054345:Receptors, KIR2DL4 / Q000378:metabolism*; D015398:Signal Transduction / Q000502:physiology*
chemical_list: D006680:HLA Antigens; D059951:HLA-G Antigens; D015395:Histocompatibility Antigens Class I; C515079:KIR2DL4 protein, human; D016328:NF-kappa B; D054345:Receptors, KIR2DL4; D051747:DNA-Activated Protein Kinase; D051057:Proto-Oncogene Proteins c-akt