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• W2000875437 abstract "Leukemic lymphocytes possess a cytolytic P2Z/P2X7 receptor which, when activated by extracellular ATP, opens a Ca2+- and Ba2+-permeable ion channel. This ATP-stimulated influx of divalent cations has been shown to activate an intracellular phospholipase D (PLD) which hydrolyzes membrane phosphatidylcholine. Lymphocytes that were exposed to ATP for 20 min at 37 degrees C, washed, and then incubated without ATP for 2 h showed an increased uptake of propidium2+, a dye widely used to measure cytotoxicity. The potent P2Z/P2X7 receptor inhibitor, KN-62, which is known to prevent the channel opening when added with ATP, did not block development of the permeability lesion when added 15 min before dye addition. The activity of lymphocyte PLD was stimulated fourfold by ATP and a proportion of this increased activity persisted for several hours after removal of ATP. Loading lymphocytes with intracellular choline+ by prior incubation of cells with ATP in isotonic choline chloride abolished both ATP-stimulated PLD activity and the ATP-induced permeability lesion. Addition of PLD but not phospholipase C to the extracellular medium increased lymphocyte permeability to propidium2+ and this effect was not observed in a choline medium. The cytolytic effect of exogenous PLD together with the inhibitory effect of choline, a product of the PLD reaction, suggests that sustained activation of intracellular PLD may be involved in the ATP-initiated cytolytic pathway." @default.
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• W2000875437 date "1999-02-01" @default.
• W2000875437 modified "2023-09-25" @default.
• W2000875437 title "Activation of the P2Z/P2X7Receptor in Human Lymphocytes Produces a Delayed Permeability Lesion: Involvement of Phospholipase D" @default.
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• W2000875437 doi "https://doi.org/10.1006/abbi.1998.1045" @default.
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