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• W137487505 abstract "Macrophage scavenger receptors (MSR) bind and internalize oxidized low density lipoprotein (OxLDL), a modified lipoprotein that is thought to be the proximal source of lipids that accumulate within cells of atherosclerotic lesions. The role of lipoproteins in modulating MSR expression are undetermined. We studied the effect of lipoproteins, native and modified LDL (acetylated LDL (AcLDL) and OxLDL) on the expression of the MSR in RAW cells, a murine macrophage cell line. Exposure to lipoproteins resulted in a marked induction of MSR mRNA expression (12- to 17-fold) with OxLDL and AcLDL having the greatest effects. Maximum induction occurred 1 hour after treatment with OxLDL and LDL. AcLDL induced a fourfold increase at 1 hour followed by a return to baseline and peak expression (sixfold) at 14 hours. Scavenger receptor function, as measured by 125I-AcLDL binding, was only modestly increased in response to lipoproteins. Incubation of macrophages with a cholesterol acceptor particle resulted in a dose-dependent decrease in MSR mRNA expression, which paralleled cholesterol loss from the cells. OxLDL did not affect MSR mRNA stability, implying that MSR mRNA was transcriptionally regulated by lipoproteins. Finally, peritoneal macrophages were isolated from mice following intraperitoneal injection of lipoproteins. Macrophage expression of MSR mRNA was significantly (16-fold) increased by LDL, AcLDL, or OxLDL relative to mice infused with phosphate-buffered saline. This demonstration that exposure to lipoproteins increases expression of the macrophage scavenger receptor implies that lipoproteins can further contribute to foam cell development in atherosclerosis." @default.
• W137487505 created "2016-06-24" @default.
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• W137487505 creator A5061554211 @default.
• W137487505 date "1998-06-01" @default.
• W137487505 modified "2023-09-23" @default.
• W137487505 title "Lipoproteins modulate expression of the macrophage scavenger receptor." @default.
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• W137487505 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/1858437" @default.
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