Definition of natural killer cell in English:

natural killer cell


  • A lymphocyte able to bind to certain tumor cells and virus-infected cells without the stimulation of antigens, and kill them by the insertion of granules containing perforin.

    ‘Animal studies indicate that it enhances the immune system by stimulating natural killer cells and T cells, and by decreasing cancerous tumor's size.’
    • ‘These cytokines recruit and activate neutrophils, lymphocytes, macrophages, eosinophils, and natural killer cells at the site of infection.’
    • ‘However, these lymphocytes have very few natural killer cells and low antitumor cytolytic activity.’
    • ‘The mouse first goes through a pre-leukemic stage marked by rapidly expanding T cells and natural killer cells, both major components of the immune system.’
    • ‘As part of the immune system, natural killer cells normally are present in the blood stream and play a role in defending the body against infection and against some cancers.’
    • ‘In addition, there is heightened expression of surface antigens and activity of natural killer cells.’
    • ‘In some animal studies, it stimulates natural killer cells and monocytes, which the immune system uses to fight off viruses.’
    • ‘Children with autism had 20 percent higher concentrations of antibody producing B cells and 40 percent more natural killer cells.’
    • ‘When we laugh, T cells, natural killer cells and cells that produce antibodies increase in number.’
    • ‘Researchers suggested that this is a result of an inability to replenish activated natural killer cells.’


natural killer cell

/ˈnaCH(ə)rəl ˈkilər sel/ /ˈnætʃ(ə)rəl ˈkɪlər sɛl/