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• W2028312892 abstract "Human serum paraoxonase 1 (PON1) activity is inversely related to the risk of developing an atherosclerotic lesion, which contains cholesterol-loaded macrophage foam cells. To assess a possible mechanism for this relationship, we analyzed the effect of PON1 on cellular cholesterol biosynthesis.Mouse peritoneal macrophages (MPMs) were harvested from PON1-deficient mice (PON1o and PON1o/Eo mice on the genetic background of C57BL/6J and Eo mice, respectively). PON1o/Eo mice exhibited a significantly 51% increased atherosclerotic lesion area and 35% increased macrophage cholesterol content compared with control E degrees mice. In parallel, macrophage cholesterol biosynthesis rates were increased in PON1-deficient mice MPMs by 50% compared with their controls. Incubation of macrophages with human PON1 revealed a dose-dependent inhibitory effect (up to 84%) on macrophage cholesterol biosynthesis. We demonstrated a PON1 phospholipase-A2-like activity on MPMs, evidenced by release of polyunsaturated fatty acids and formation of lysophosphatidylcholine. On incubation of macrophages with lysophosphatidylcholine, a dose-dependent inhibition (up to 40%) of cellular cholesterol biosynthesis was noted. The inhibitory effect of PON1 on macrophage cholesterol biosynthesis was shown to be downstream to mevalonate, probably at the lanosterol metabolic point.PON1 inhibits macrophage cholesterol biosynthesis and atherogenesis probably through its phospholipase-A2-like activity." @default.
• W2028312892 created "2016-06-24" @default.
• W2028312892 creator A5000348414 @default.
• W2028312892 creator A5000693838 @default.
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• W2028312892 date "2003-03-01" @default.
• W2028312892 modified "2023-09-23" @default.
• W2028312892 title "Human Serum Paraoxonase 1 Decreases Macrophage Cholesterol Biosynthesis" @default.
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• W2028312892 doi "https://doi.org/10.1161/01.atv.0000060462.35946.b3" @default.
• W2028312892 hasPubMedId "https://pubmed.ncbi.nlm.nih.gov/12615663" @default.
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