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• W2016988125 endingPage "456" @default.
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• W2016988125 abstract "Farnesol (FOH) inhibits the CDP-choline pathway for PtdCho (phosphatidylcholine) synthesis, an activity that is involved in subsequent induction of apoptosis. Interestingly, the rate-limiting enzyme in this pathway, CCTα (CTP:phosphocholine cytidylyltransferase α), is rapidly activated, cleaved by caspases and exported from the nucleus during FOH-induced apoptosis. The purpose of the present study was to determine how CCTα activity and PtdCho synthesis contributed to induction of apoptosis by FOH and oleyl alcohol. Contrary to previous reports, we show that the initial effect of FOH and oleyl alcohol was a rapid (10–30 min) and transient activation of PtdCho synthesis. During this period, the mass of DAG (diacylglycerol) decreased by 40%, indicating that subsequent CDP-choline accumulation and inhibition of PtdCho synthesis could be due to substrate depletion. At later time points (&gt;1 h), FOH and oleyl alcohol promoted caspase cleavage and nuclear export of CCTα, which was prevented by treatment with oleate or DiC8 (dioctanoylglycerol). Protection from FOH-induced apoptosis required CCTα activity and PtdCho synthesis since (i) DiC8 and oleate restored PtdCho synthesis, but not endogenous DAG levels, and (ii) partial resistance was conferred by stable overexpression of CCTα and increased PtdCho synthesis in CCTα-deficient MT58 cells. These results show that DAG depletion by FOH or oleyl alcohol could be involved in inhibition of PtdCho synthesis. However, decreased DAG was not sufficient to induce apoptosis provided nuclear CCTα and PtdCho syntheses were sustained." @default.
• W2016988125 created "2016-06-24" @default.
• W2016988125 creator A5052665648 @default.
• W2016988125 creator A5090983361 @default.
• W2016988125 date "2005-12-06" @default.
• W2016988125 modified "2023-10-16" @default.
• W2016988125 title "Induction of apoptosis by lipophilic activators of CTP:phosphocholine cytidylyltransferase α (CCTα)" @default.
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• W2016988125 doi "https://doi.org/10.1042/bj20051021" @default.
• W2016988125 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/1316283" @default.
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