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- W1918374492 abstract "Abstract We measured phospholipase A2 (PLA2; EC 3.1.1.4) activity in normal and uremic plasma, using [1-14C]oleate-labeled autoclaved Escherichia coli as substrate. Hydrolysis of bacterial phospholipid by crude plasma from both groups was optimal at pH 5.5, was specific for the 2-acyl position of phospholipids, and had an absolute requirement for calcium. Activity was greatest in the presence of added Ca2+, 5 mmol/L, but this increase was inhibited by several divalent cations (Mg2+, Zn2+, Cu2+, Ba2+, Co2+, Pb2+, Fe2+) and by Fe3+. PLA2 activity was also inhibited by heparin at acid and alkaline pH, normal plasma being more sensitive than uremic plasma to this inhibition. Enzyme activity in undiluted plasma was eightfold greater in uremic than in normal plasma. Dilution of plasma by two to fourfold increased the total activity of both normal and uremic plasma. However, the relative differences in total activity between the groups remained constant (eight- to 11-fold). The cause and consequences of the increased PLA2 activity in uremia remain to be established." @default.
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- W1918374492 date "1990-02-01" @default.
- W1918374492 modified "2023-10-11" @default.
- W1918374492 title "Activity of phospholipase A2 in plasma increases in uremia" @default.
- W1918374492 doi "https://doi.org/10.1093/clinchem/36.2.198" @default.
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