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• W1980202854 abstract "We investigated the hydrolysis of the minor glycerophospholipids of human HDL3, total HDL and LDL using human group IIA, V and X secretory phospholipases A2 (sPLA2s). For this purpose we employed the enzyme and substrate concentrations and incubation times optimized for hydrolysis of phosphatidylcholine (PtdCho), the major glycerophospholipid of plasma lipoproteins. In contrast to PtdCho, which was readily hydrolyzed by group V and X sPLA2s, and to a lesser extent by group IIA sPLA2, the minor ethanolamine, inositol and serine glycerophospholipids exhibited marked resistance to hydrolysis by all three sPLA2s. Thus, when PtdCho was hydrolyzed about 80%, the ethanolamine and inositol glycerophospholipids reached a maximum of 40% hydrolysis. The hydrolysis of phosphatidylserine (PtdSer), which was examined to a more limited extent, showed similar resistance to group IIA, V and X sPLA2s, although the group V sPLA2 attacked it more readily than group X sPLA2 (52% versus 39% hydrolysis, respectively). Surprisingly, the group IIA sPLA2 hydrolysis remained minimal at 10–15% for all minor glycerophospholipids, and was of the order seen for the PtdCho hydrolysis by group IIA sPLA2 at the 4-h digestion time. All three enzymes attacked the oligo- and polyenoic species in proportion to their mole percentage in the lipoproteins, although there were exceptions. There was evidence of a more rapid destruction of the palmitoyl compared to the stearoyl arachidonoyl glycerophospholipids. Overall, the characteristics of hydrolysis of the molecular species of the lipoprotein-bound diradyl GroPEtn, GroPIns and GroPSer by group V and X sPLA2s differed significantly from those observed with lipoprotein-bound PtdCho. As a result, the acidic inositol and serine glycerophospholipids accumulated in the digestion residues of both LDL and HDL, and presumably increased the acidity of the residual particles. An accumulation of the ethanolamine glycerophospholipids in the sPLA2 digestion residues also had not been previously reported. These results further emphasize the diversity in the enzymatic activity of the group IIA, V and X sPLA2s. Since these sPLA2s possess comparable tissue distribution, their combined activity may exacerbate their known proinflammatory and proatherosclerotic function." @default.
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• W1980202854 date "2007-01-01" @default.
• W1980202854 modified "2023-09-27" @default.
• W1980202854 title "Hydrolysis of minor glycerophospholipids of plasma lipoproteins by human group IIA, V and X secretory phospholipases A2" @default.
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• W1980202854 doi "https://doi.org/10.1016/j.bbalip.2006.11.008" @default.
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