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• W1480600644 abstract "Abstract The occurrence and regulation of 1-ether-linked diradylglycerol in human neutrophils were investigated using a sensitive and practical analytical mass method which distinguishes 1-O-alkyl- (EAG) versus 1-acyl (DAG) diglycerides. After phosphorylation of diglycerides to the corresponding [32P]phosphatidic acids using [gamma-32P]ATP and diglyceride kinase (Preiss, J., Loomis, C. R., Bishop, W. R., Stein, R., Niedel, J. E., and Bell, R. M. (1986) J. Biol. Chem. 261, 8597-8600), lipase from Rhizopus arrhizus selectively degraded the 1-acyl-containing species (DAG), but the ether lipid (EAG) was resistant and was identified and quantified after thin layer chromatography separation. By using this method, unstimulated neutrophils were demonstrated to contain both DAG and EAG (100-180 and 40-95 pmol/10(7) cells, respectively). The chemoattractant formyl-methionyl-leucyl-phenylalanine (fMLP) caused a rapid (30 s) and transient increase (1.6-fold) in DAG, but no increase in EAG. Opsonized zymosan produced a 6-8-fold sustained increase in DAG peaking at 2 to 3 min, but only a small (1.7-fold) increase in EAG which was not seen until later times (10 min). Thus, under these stimulation conditions, the major diglyceride was DAG. However, in neutrophils primed with cytochalasin B or phorbol ester, formyl-methionyl-leucyl-phenylalanine caused a significant increase in EAG. Neutrophils pretreated with cytochalasin B and then stimulated by fMLP showed a rapid (15-60 s) increase (more than 3-fold) in total diglycerides which was sustained beyond 5 min. At the earliest time points (15-30 s), the increase was due almost entirely to DAG (3-fold), but at 1 min and beyond, EAG comprised as much as 40% of the total (up to a 5-fold increase in EAG). Neutrophils pretreated with phorbol ester prior to fMLP stimulation showed a rapid (around 30 s) more than 2-fold increase in both DAG and EAG. Thus, priming conditions (in particular cytochalasin B) may alter either the access of phospholipase(s) C and/or D to membrane phospholipids or may affect their activities, allowing hydrolysis of 1-O-alkyl-containing lipids to generate 1-O-alkyl-containing diglycerides." @default.
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• W1480600644 date "1989-08-01" @default.
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• W1480600644 title "On the Biological Occurrence and Regulation of 1-Acyl and 1-O-Alkyl-diradylglycerols in Human Neutrophils" @default.
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• W1480600644 doi "https://doi.org/10.1016/s0021-9258(18)51583-0" @default.
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