natural killer cell

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Related to NK cell: mast cell, B cell, T cell

natural killer cell

[¦nach·rəl ′kil·ər ‚sel]
(histology)
A large, granular lymphocyte that can lyse a variety of target cells when it is activated by interferon. Abbreviated NK.
References in periodicals archive ?
Loss-of-function mutations in these proteins result in loss of target cell killing by NK cells and CD8+ T cells, resulting in a life-threatening sepsis-like condition.
NK cells were cultured in RPMI1640 medium supplemented with 10% heat-inactivated fetal calf serum (PAA, Pasching, Austria), 2 mM L-glutamine, 100 U/ml penicillin and 100 U/ml streptomycin (all from Life Technologies, Paisley, UK).
Potential role of NK cells in the induction of immune responses: implications for NK cell-based immunotherapy for cancers and viral infections.
The investigators found that patients were far more likely to have survived the transplant and far less likely to have their disease progress if their new bone marrow came from donors whose NK cells included the same version of the protein, rather than the alternative form.
The role of NK cells in the control of HIV-1 infection is being investigated with many genetic association studies of the role of select KIR receptors in isolation, or in combination with their HLA ligands, on HIV-1 disease progression and to a more limited extent HIV-1 adult transmission.
Mitotic figures are easily found, and Giemsa-stained touch preparations commonly highlight the azurophilic granules within the cytoplasm, which resemble those found in normal NK cells (3).
Moreover, low-level NK cell activity may be useful for predicting patient outcome (23); therefore, a suitable clinical assay for NK cell activity is necessary.
8) Substance P was shown to induce and mediate inflammation, angiogenesis, infections, intestinal mucosal immunity and stress and also activate several immune cells, such as CD4+ and CD8+ T lymphocytes, mast cells, NK cells and macrophages.
NK cells normally play a central role in immune surveillance against the metastatic spread of cancer.
1,3,4) In addition, many proliferating T cells have been shown to express an additional marker (CD56), which suggests an NK cell origin; these tumors are classified as T/NK cell lymphomas.
As expected for NK cell activity, increasing the effector:target cell ratio resulted in increased specific mortality of target cells (Fig.