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- W2137188051 abstract "The LXR nuclear receptors are intracellular sensors of cholesterol excess and are activated by various oxysterols. LXRs have been shown to regulate multiple genes of lipid metabolism, including ABCA1 (formerly known asABC1). ABCA1 is a lipid pump that effluxes cholesterol and phospholipid out of cells. ABCA1 deficiency causes extremely low high density lipoprotein (HDL) levels, demonstrating the importance of ABCA1 in the formation of HDL. The present work shows that the acetyl-podocarpic dimer (APD) is a potent, selective agonist for both LXRα (NR1H3) and LXRβ (NR1H2). In transient transactivation assays, APD was ∼1000-fold more potent, and yielded ∼6-fold greater maximal stimulation, than the widely used LXR agonist 22-(R)-hydroxycholesterol. APD induced ABCA1mRNA levels, and increased efflux of both cholesterol and phospholipid, from multiple cell types. Gas chromatography-mass spectrometry measurements demonstrated that APD stimulated efflux of endogenous cholesterol, eliminating any possible artifacts of cholesterol labeling. For both mRNA induction and stimulation of cholesterol efflux, APD was found to be more effective than was cholesterol loading. Taken together, these data show that APD is a more effective LXR agonist than endogenous oxysterols. LXR agonists may therefore be useful for the prevention and treatment of atherosclerosis, especially in the context of low HDL levels." @default.
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- W2137188051 date "2002-03-01" @default.
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- W2137188051 title "A Potent Synthetic LXR Agonist Is More Effective than Cholesterol Loading at Inducing ABCA1 mRNA and Stimulating Cholesterol Efflux" @default.
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- W2137188051 doi "https://doi.org/10.1074/jbc.m108225200" @default.
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