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• W2046292099 abstract "Normal human ectocervical epithelial (hECE) cells undergo apoptosis in culture. Baseline apoptosis could be increased by shifting cells to serum-free medium and blocked by lowering extracellular calcium. Treatment with the ATPase apyrase attenuated baseline apoptosis, suggesting that extracellular ATP and purinergic mechanisms control the apoptosis. Treatment with ATP and the P2X 7 receptor analog 2′-3′- O-(4-benzoylbenzoyl)adenosine 5′-triphosphate (BzATP) increased apoptosis significantly, in a time- and dose-related manner. The threshold of ATP effect was 0.5 μM in hECE cells and ∼1 μM in CaSki cancer cells. The apoptotic effect of BzATP was additive in part to that of tumor necrosis factor (TNF)-α, and it could be attenuated by lowering extracellular calcium and by treatment with the caspase-9 inhibitor Leu-Glu-His-Asp- O-methyl-fluoromethylketone (LEHD-FMK). Treatment with BzATP activated caspase-9, and, in contrast to TNF-α, it had only a mild effect on caspase-8. Both BzATP and TNF-α activated caspase-3, suggesting that BzATP activates predominantly the mitochondrial apoptotic pathway. Both hECE and CaSki cells secrete ATP into the extracellular fluid, and mean ATP activity in conditioned medium was ∼0.5 μM, which is in the range of values that suffice to activate the P2X 7 receptor. On the basis of these findings we propose a novel autocrine-paracrine mechanism of cervical cell apoptosis that operates by P2X 7 receptor control of cytosolic calcium and utilizes the mitochondrial apoptotic pathway." @default.
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• W2046292099 date "2004-11-01" @default.
• W2046292099 modified "2023-10-17" @default.
• W2046292099 title "P2X₇receptor-mediated apoptosis of human cervical epithelial cells" @default.
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• W2046292099 doi "https://doi.org/10.1152/ajpcell.00256.2004" @default.
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