II. Definitions

  1. Natural Killer Cell (NK cell)
    1. Lymphocytes providing protection against Intracellular Bacteria and viruses, as well as cancer cells
    2. Part of Innate Immunity in which response is not based on prior exposure to pathogen
      1. Contrast with B-Cells and T-Cells which have a learned pathogen response (Adaptive Immunity)

III. Physiology

  1. NK cells bind Major Histocompatibility Complex 1 (MHC-1)
    1. MHC-1 is present on normal cells and it inactivates NK cells
    2. MHC-1 is NOT expressed by infected cells
      1. NK activating receptor Ligand is expressed
      2. NK cells bind infected cells and destroy them
  2. NK cell mechanisms of infected cell destruction
    1. Cytoplasmic granules
      1. Perforin
        1. Generates pores on cells targeted for destruction
      2. Granzyme
        1. Induces programmed cell death (apoptosis) on entry into Target Cells
    2. Cytokines
      1. Interferon-Gamma (IFN-g)
        1. Activates Macrophages for Phagocytosis

IV. References

  1. Mahmoudi (2014) Immunology Made Ridiculously Simple, MedMaster, Miami, FL

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Related Studies

Ontology: Natural Killer Cells (C0022688)

Definition (MSH) Bone marrow-derived lymphocytes that possess cytotoxic properties, classically directed against transformed and virus-infected cells. Unlike T CELLS; and B CELLS; NK CELLS are not antigen specific. The cytotoxicity of natural killer cells is determined by the collective signaling of an array of inhibitory and stimulatory CELL SURFACE RECEPTORS. A subset of T-LYMPHOCYTES referred to as NATURAL KILLER T CELLS shares some of the properties of this cell type.
Definition (MSHCZE) Lymfocyty získané z kostní dřeně, které mají cytotoxické vlastnosti, přirozeně namířené proti transformovaným buňkám a buňkám infikovaným virem. NK buňky nejsou na rozdíl od T buněk a B buněk antigenově specifické (projevuje se nespecifickou imunitou). Cytotoxicita těchto buněk je zajištěna pomocí receptorů na povrchu buněk, které společně signalizují stavy inhibice a stimulace buněk. Jedná se o podskupina T-LYMPHOCYTŮ, která bývá označována jako „přirození zabíječi“ (NKT BUŇKY) (angl. natural killers) a sdílí s těmito buňkami některé vlastnosti. R
Definition (NCI) Natural killer cells are cells that resemble large granular lymphocytes. They do not express markers of either T or B cell lineage. They are positive for CD16, CD56, and CD 94. These cells do possess Fc receptors for IgG and can kill target cells using antibody-dependent cell-mediated cytotoxicity. They can also use perforin to kill cells in the absence of antibody and killing may occur without previous sensitization.
Definition (NCI_NCI-GLOSS) A type of immune cell that has granules (small particles) with enzymes that can kill tumor cells or cells infected with a virus. A natural killer cell is a type of white blood cell.
Definition (PSY) White blood cells that kill tumor- and virus-infected cells as part of the body's immune system.
Definition (CSP) type of cytotoxic leukocytes which attack and kill virus-infected or neoplastic cells independent of antibody coating or MHC restriction; may be derived from lymphocytes or monocytes.
Concepts Cell (T025)
MSH D007694
SnomedCT 259717003
LNC LA4573-7
English Cell, Natural Killer, Cell, NK, Cells, Natural Killer, Cells, NK, Killer Cell, Natural, Killer Cells, Natural, NK Cells, K lymphocyte, Killer cell, K cell, NK-cell (cell), Natural killer (NK)-cell, Natural killer cell, NK cell, nk cell, nk-cell, natural killer cells, nk cells, cells natural killer, Natural killer cell (cell), Natural killer (NK)-cell (cell), natural killer cell, NK-LGL, killer cell, NK (natural killer) cell, NK-cell, NK-cell (body structure), Natural Killer Cell, NK Cell, Killer Cell, NK-Cell, NK, Natural Killer Cells
Spanish célula NK, linfocito K, Células Asesinas Naturales, Células Killer Naturales, célula natural killer, célula asesina natural, Células Killer, linfocito citolítico natural (célula), linfocito citolítico natural, Células NK
French Cellule tueuse naturelle, Cellules tueuses naturelles, Cellules NK, Cellule NK
Swedish Mördarceller, naturliga
Czech buňky NK, buňky natural killer
Finnish Luonnolliset tappajasolut
Italian Cellule NK, Cellule Natural Killer
Russian KLETKI-KILLERY ESTESTVENNYE, NK-KLETKI, ESTESTVENNYE KLETKI-KILLERY, K-KLETKI, KILLERNYE KLETKI, КИЛЛЕРНЫЕ КЛЕТКИ, K-КЛЕТКИ, NK-КЛЕТКИ, ЕСТЕСТВЕННЫЕ КЛЕТКИ-КИЛЛЕРЫ, КЛЕТКИ-КИЛЛЕРЫ ЕСТЕСТВЕННЫЕ
Japanese NK細胞, キラー細胞-ナチュラル, ナチュラルキラー細胞
Croatian PRIROĐENO UBILAČKE STANICE
Polish Komórki NK, Komórki natural killer, Komórka-naturalny zabójca, Komórki naturalnej cytotoksyczności
Norwegian Natural killer-celler, Drepeceller, naturlige, Naturlige drapsceller, Drapsceller, naturlige, Naturlige drepeceller, NK-celler
Portuguese Células Exterminadoras, Células Destruidoras, Células Killer, Células Natural Killer, Células Destruidoras Naturais, Células Assassinas, Células Killer Naturais, Células Assassinas Naturais, Células Exterminadoras Naturais, Células NK, Células Matadoras Naturais
German NK-Zellen, Killerzellen, natürliche, Natürliche Killerzellen
Dutch K-cel, Killercellen, Natural-killercel, Natural-killercellen