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• W1610263906 endingPage "3504" @default.
• W1610263906 startingPage "3498" @default.
• W1610263906 abstract "Abstract Agents which elevate cellular cAMP (prostaglandin E2, theophylline, and forskolin) or mimic cAMP action (dibutyryl cAMP) are known to inhibit human neutrophil activation (superoxide generation and secretion) by receptor-linked agonists such as formyl-methionyl-leucyl-phenylalanine (fMLP). Herein, we show that these agents also markedly inhibit fMLP-stimulated diradylglycerol generation (assayed by mass methods). The magnitude of inhibition correlated with the ability of a given agent or combination of agents to elevate cAMP. Both 1,2-diacylglycerol and 1-O-alkyl,2-acyl glycerol generation were affected. Effects on the latter species, as well as a lack of effect on fMLP-stimulated inositol phosphate release, implied that cAMP affected diradylglycerol generation from a source other than phospholipase C-dependent phosphoinositide hydrolysis, since phosphatidylinositols do not contain appreciable quantities of the 1-O-alkyl linkage. In cells in which the phosphatidylcholine pool was prelabeled using 1-O-[3H]octadecyl-2-lyso-sn-glycero-3-phosphocholine, prostaglandin E2 plus theophylline inhibited the fMLP-activated rapid generation of [3H]phosphatidic acid and its subsequent conversion to [3H]diradylglycerol, implying an effect at the level of phospholipase D. In the presence of ethanol, the fMLP-activated transphosphatidylation of [3H]phosphatidylcholine to generate [3H]phosphatidylethanol (a phospholipase D-dependent reaction) was also markedly inhibited. In contrast, when phorbol 12-myristate 13-acetate was used to activate cells, cAMP-related agents had no effect on phospholipase D activity, diradylglycerol generation, or superoxide generation. The data indicate an inhibitory effect of cyclic AMP on receptor-mediated phospholipase D activation at a site proximal to phospholipase D (e.g., the receptor or G protein). These studies provide a new example of cross-talk among signal transduction systems." @default.
• W1610263906 created "2016-06-24" @default.
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• W1610263906 date "1991-02-01" @default.
• W1610263906 modified "2023-10-18" @default.
• W1610263906 title "Cyclic AMP-elevating agents block chemoattractant activation of diradylglycerol generation by inhibiting phospholipase D activation" @default.
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• W1610263906 doi "https://doi.org/10.1016/s0021-9258(19)67823-3" @default.
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• W1610263906 hasPublicationYear "1991" @default.
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