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• W1567175574 abstract "It has recently been reported (T. Shimizu et al., J. Biol. Chem., 273: 8669-8674, 1998) that the pro-apoptotic drug, camptothecin, an inhibitor of topoisomerase I, induces a protein kinase C-alpha-mediated phosphorylation of lamin B in HL-60 cells, which precedes both degradation of lamin B and fragmentation of DNA. In this paper, we report that, in HL-60 cells exposed to camptothecin, there is a rapid and sustained increase of nuclear protein kinase C-alpha activity that is due to an increase in the amount of protein kinase C-alpha present in the nucleus. The enhancement of nuclear kinase C activity is preceded by an increase in the mass of nuclear diacylglycerol. As demonstrated by its sensitivity to propranolol, the nuclear diacylglycerol mass increase is due to the activation of a phospholipase D. Indeed, inhibitors of neither phosphatidylcholine-specific phospholipase C nor phosphoinositide-specific phospholipase C blocked the rise in nuclear diacylglycerol. In vitro assays also demonstrated the activation of a nuclear phospholipase D, but not of a phosphoinositide-specific phospholipase C, after treatment with camptothecin. Propranolol was also able to block the rise in nuclear protein kinase C-alpha activity, thus suggesting that the increase in diacylglycerol mass is important for the activation of the kinase at the nuclear level. Moreover, propranolol was capable of drastically reducing the number of HL-60 cells that underwent apoptosis after treatment with camptothecin. Our results show the activation during apoptosis of a phospholipase D-mediated signaling pathway operating at the nuclear level. This pathway may represent an attractive therapeutic target for the modulation of apoptotic events in human disease." @default.
• W1567175574 created "2016-06-24" @default.
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• W1567175574 date "1999-08-15" @default.
• W1567175574 modified "2023-09-23" @default.
• W1567175574 title "The pro-apoptotic drug camptothecin stimulates phospholipase D activity and diacylglycerol production in the nucleus of HL-60 human promyelocytic leukemia cells." @default.
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