natural killer cells


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nat·u·ral kill·er cells (NK),

large granular lymphocytes that do not express markers of either T or B cell lineage. These cells do possess Fc receptors for IgG and can kill target cells using antibody-dependent cell-mediated cytotoxicity. NK cells can also use perforin to kill cells in the absence of antibody. Killing occurs without previous sensitization.
Synonym(s): NK cells

natural killer cells

A class of large, granular lymphocytes that bind directly to cells bearing foreign ANTIGENS and kill them. Natural killer cells do not require prior exposure of the immune system to the antigen and kill their victims by programmed cell death (apoptosis).
References in periodicals archive ?
In addition to T cells and natural killer cells, Cistanche also helps activate other important immune cells, including macrophages, dendritic cells, and B cells.
Kratzschmar et al., "Frequency of blood CX3CR1-positive natural killer cells correlates with disease activity in multiple sclerosis patients," The FASEB Journal, vol.
Meyer-Monard et al., "Pre-emptive immunotherapy with purified natural killer cells after haploidentical SCT: a prospective phase II study in two centers," Bone Marrow Transplantation, vol.
Natural killer cells are characterized by the concomitantly increased interferon-gamma and cytotoxicity in acute resolved hepatitis B patients.
Lorraine had to pay privately to find out whether she had a higher than usual level of natural killer cells as the treatment is not funded by the NHS.
Natural killer cells respond quickly to cells that have been infected with a virus.
The test will look for the presence of natural killer cells in the lining of the womb, which recent research has indicated could be a cause of repeat miscarriages.
Summary: TEHRAN (FNA)- Researchers could find the reason why natural killer cells are powerless against HIV, a fact that has bedeviled science for over 20 years.

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