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- W1520488118 abstract "The effects of opsonised zymosan and of acetylated low-density lipoprotein (AcLDL) on the synthesis and secretion of apolipoprotein E (apoE), and of apoE mRNA abundance, have been studied in human-monocyte-derived macrophages (MDM). Stimulation by opsonised zymosan led to a concentration-dependent increase in apoE secretion; non-opsonised zymosan was without effect. Incubation with AcLDL led to a concentration-dependent elevation in apoE synthesis which paralleled the increase in cellular cholesterol content. The opsonised-zymosan-induced stimulation of apoE production was additive to that resulting from cholesterol loading with AcLDL. Opsonised zymosan alone did not affect the cholesterol content of MDM. Cholesterol-loaded MDM remained responsive to opsonised zymosan stimulation, displaying a 3.5-fold elevation in apoE secretion as compared to their non-stimulated counterparts. Cell-associated apoE remained at trace levels under all conditions of cell treatment. Studies involving [35S]methionine incorporation showed de novo synthesis of apoE to be enhanced in both cholesterol-loaded and opsonised-zymosan-stimulated macrophages. Estimation of apoE mRNA in opsonised-zymosan-stimulated and control MDM by dot-blot analysis revealed similar message abundance; by contrast, elevation in cellular cholesterol content following incubation with modified LDL led to a significant increase in apoE mRNA levels. We conclude that the opsonised-zymosan-induced stimulation of apoE synthesis and secretion in human MDM may occur by a mechanism(s) independent of cellular cholesterol content." @default.
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- W1520488118 date "1990-04-01" @default.
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- W1520488118 title "Apolipoprotein E expression by human-monocyte-derived macrophages. Modulation by opsonised zymosan and cholesterol" @default.
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- W1520488118 doi "https://doi.org/10.1111/j.1432-1033.1990.tb15509.x" @default.
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