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• W2044218480 abstract "The metabolism of phosphatidylcholine (PC) was investigated in sonicated suspensions of bovine pulmonary artery endothelial cells and in subcellular fractions using two PC substrates: 1-oleoyl-2-[3H]oleoyl-sn-glycero-3- phosphocholine and 1,2-dipalmitoyl-sn-glycero-3-phospho[14C]choline. When these substrates were incubated with the whole cell sonicate at pH 7.5, all of the metabolized 3H label was recovered in [3H]oleic acid (95%) and [3H]diacylglycerol (5%). All of the 14C label was identified in [14C]lysoPC (92%) and [14C]phosphocholine (8%). These data indicated that PC was metabolized via phospholipase(s) A and phospholipase C. Substantial diacylglycerol lipase activity was identified in the cell sonicate. Production of similar proportions of diacylglycerol and phosphocholine and the low relative activity of phospholipase C compared to phospholipase A indicated that the phospholipase C-diacylglycerol lipase pathway contributed little to fatty acid release from the sn-2 position of PC. Neither phospholipase A nor phospholipase C required Ca2+. The pH profiles and subcellular fractionation experiments indicated the presence of multiple forms of phospholipase A, but phospholipase C activity displayed a single pH optimum at 7.5 and was located exclusively in the participate fraction. The two enzyme activities demonstrated differential sensitivities to inhibition by p-bromophenacylbromide, phenylmethanesulfonyl fluoride and quinacrine. Each of these agents inhibited phospholipase A, whereas phospholipase C was inhibited only by p-bromophenacylbromide. The unique characteristics observed for phospholipase C activity towards PC indicated the existence of a novel enzyme that may play an important role in lipid metabolism in endothelial cells." @default.
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• W2044218480 date "1987-02-01" @default.
• W2044218480 modified "2023-09-25" @default.
• W2044218480 title "Phosphatidylcholine metabolism in endothelial cells: Evidence for phospholipase A and a novel Ca2+-independent phospholipase C" @default.
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• W2044218480 doi "https://doi.org/10.1016/0005-2760(87)90134-2" @default.
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