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- W4200508925 abstract "Although the mechanism of NK cell activation is still unclear, the strict calcium dependence remains the hallmark for lytic granule secretion. A plethora of studies claiming that impaired Ca2+ signaling leads to severely defective cytotoxic granule exocytosis accompanied by weak target cell lysis has been published. However, there has been little discussion about the effect of induced calcium signal on NK cell cytotoxicity. In our study, we observed that small-molecule inhibitor UNC1999, which suppresses global H3K27 trimethylation (H3K27me3) of human NK cells, induced a PKD2-dependent calcium signal. Enhanced calcium entry led to unbalanced vesicle release, which resulted into fewer target cells acquiring lytic granules and subsequently being killed. Further analyses revealed that the ability of conjugate formation, lytic synapse formation, and granule polarization were normal in NK cells treated with UNC1999. Cumulatively, these data indicated that induced calcium signal exclusively enhances unbalanced degranulation that further inhibits their cytotoxic activity in human NK cells." @default.
- W4200508925 created "2021-12-31" @default.
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- W4200508925 date "2022-01-15" @default.
- W4200508925 modified "2023-10-02" @default.
- W4200508925 title "Enhanced Calcium Signal Induces NK Cell Degranulation but Inhibits Its Cytotoxic Activity" @default.
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- W4200508925 doi "https://doi.org/10.4049/jimmunol.2001141" @default.
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