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- W2000245817 abstract "HDL2 and HDL3 subfractions of two species of apo A-I-containing lipoprotein, one containing only apo A-I (LpA-I) and the other containing both apo A-I and apo A-II (LpA-I/A-II), were tested for reactivity to lecithin:cholesterol acyltransferase (LCAT). These subfractions and their mixtures were incubated with lipoprotein-deficient plasma (LCAT source), and the rate of cholesterol esterification and kinetic parameters were determined. Apparent Vmax (appVmax) and apparent Km (appKm) for HDL2 subfractions of LpA-I and LpA-I/A-II were significantly lower than those of their HDL3 counterparts. Differences between subfractions were much more prominent in LpA-I than in LpA-I/A-II. appVmax of the HDL2 subfraction of LpA-I (LpA-IHDL2) was one-fifth, and appKm was one-third of those for the HDL3 subfraction (LpA-IHDL3). appVmm and appKm of LpA-IHDL2 were both lowest among the apo A-I-containing lipoprotein subfractions. When LpA-IHDL2 was added to other subfractions, the molar rate of cholesterol esterification was suppressed. Since LpA-IHDL2 consists of a particle 11.1 nm in diameter, our observations suggest that LpA-IHDL2 suppresses cholesterol esterification in apo A-I-containing lipoprotein, possibly by displacing LCAT from other subfractions with higher appKm and higher appVmax to 11.1 nm LpA-I particles with lower appKm and lower appVmax. All of these data suggest that the relative amount of 11.1 nm LpA-I particles in plasma regulates the reactivity of apo A-I-containing lipoprotein to LCAT and may play a key role on the production of cholesteryl esters in plasma." @default.
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- W2000245817 date "2006-01-01" @default.
- W2000245817 modified "2023-09-26" @default.
- W2000245817 title "Th-P15:71 Reduced generation of reactive oxygen species by circulating lymphomononuclear cells and endothelial cellular model in post-prandial state" @default.
- W2000245817 doi "https://doi.org/10.1016/s1567-5688(06)82031-3" @default.
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