Abstract：
:Statins are inhibitors of cholesterol biosynthesis and protein prenylation that also have been studied in cancer therapy and chemoprevention. With regard to natural killer (NK) cells, only inhibitory effects of statins such as suppression of granule exocytosis have been reported so far. In this study, we show that statins can cooperate with IL-2 to potently induce the activation of CD56(dim) NK cells in a synergistic, time- and dose-dependent fashion. Supplementation experiments revealed that the statin effect was specific to inhibition of their target hydroxymethylglutaryl coenzyme A reductase and that downstream depletion of geranylgeranyl pyrophosphate was responsible for cooperating with IL-2 in NK cell activation. Mechanistic studies revealed that CD56(+)HLA-DR(+)CD14(+) dendritic cell (DC)-like accessory cells mediated the ability of statin to activate NK cells. In contrast, BDCA-1(+) (CD1c(+)) myeloid DCs, which partially expressed CD56, were somewhat less potent. Conventional blood monocytes, which lack CD56, exhibited the lowest accessory cell capacity. NK cell IFN-γ production was IL-12 independent but required endogenous IL-18, IL-1β, and caspase-1 activity. Statins directly induced apoptosis in human cancer cell lines and cooperated with NK cell-derived IFN-γ to generate potent cytotoxic antitumor effects in vitro even in the presence of statin-mediated inhibitory effects on granule exocytosis. Our work reveals novel and unexpected immunomodulatory properties of statins, which might be harnessed for the treatment of cancer.
journal_name
Cancer Resjournal_title
Cancer researchauthors
Gruenbacher G,Gander H,Nussbaumer O,Nussbaumer W,Rahm A,Thurnher Mdoi
10.1158/0008-5472.CAN-10-1968subject
Has Abstractpub_date
2010-12-01 00:00:00pages
9611-20issue
23eissn
0008-5472issn
1538-7445pii
0008-5472.CAN-10-1968journal_volume
70pub_type
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