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Berlin Brandenburg

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  • 1
    Language: English
    In: FEBS Letters, 03 April 2007, Vol.581(7), pp.1317-1322
    Description: Treatment of transformed cells from leukemia or solid tumors with histone deacetylase inhibitors (HDACi) was shown to increase their sensitivity to NK cell lysis. In this study, treatment of IL-2-activated NK cells with HDACi including suberoylanilide hydroxamic acid and valproic acid was studied. Both drugs at therapeutic concentrations inhibited NK cell cytotoxicity on human leukemic cells. This inhibition was associated with decreased expression and function of NK cell activating receptors NKp46 and NKp30 as well as impaired granule exocytosis. NFκB activation in IL-2-activated NK cells was inhibited by both HDACi. Pharmacologic inhibition of NFκB activity resulted in similar effects on NK cell activity like those observed for HDACi. These results demonstrate for the first time that HDACi prevent NK cytotoxicity by downregulation of NK cell activating receptors probably through the inhibition of NFκB activation.
    Keywords: Cytotoxicity ; Nk Cells ; Histone Deacetylase Inhibitors ; Nk Cell Activating and Inhibitory Receptors ; Nuclear Factor Kappa B ; Biology ; Chemistry ; Anatomy & Physiology
    ISSN: 0014-5793
    E-ISSN: 1873-3468
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