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- W2068034235 abstract "The mechanism by which dietary cholesterol regulates expression of the hepatic low-density lipoprotein (LDL) receptor was investigated. In a previous study (Arch. Biochem. Biophys.325, 242–248, 1996), we demonstrated that dietary cholesterol reduces the rate of LDL receptor protein degradation without affecting steady-state levels of receptor protein. In view of these findings, it was expected that dietary cholesterol would decrease the rate of transcription of the hepatic LDL receptor gene, resulting in lower mRNA levels and lower rates of synthesis of LDL receptor protein. Surprisingly, neither the rate of transcription nor the level of LDL receptor mRNA was reduced in response to dietary cholesterol, even though hepatic cholesterol levels were increased twofold. This suggests that under normal conditions, dietary cholesterol does not affect LDL receptor gene expression at the level of transcription. In contrast, feeding 2% cholesterol to rats fed a diet supplemented with 0.04% lovastatin significantly decreased hepatic LDL receptor mRNA levels and transcription rates. These results suggest that lovastatin unmasks transcriptional regulation of the hepatic LDL receptor by dietary cholesterol. The levels of the mature nuclear forms of sterol response element binding proteins-1 and -2 were unaffected despite significant changes in hepatic cholesterol levels, mRNA levels, and transcription rates caused by lovastatin treatment. This suggests that the observed changes in transcription rates may not be mediated by these proteins in rat liver." @default.
- W2068034235 created "2016-06-24" @default.
- W2068034235 creator A5046097404 @default.
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- W2068034235 date "1997-08-01" @default.
- W2068034235 modified "2023-09-23" @default.
- W2068034235 title "Inhibitors of 3-Hydroxy-3-methylglutaryl Coenzyme A Reductase Unmask Transcriptional Regulation of Hepatic Low-Density Lipoprotein Receptor Gene Expression by Dietary Cholesterol" @default.
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- W2068034235 doi "https://doi.org/10.1006/abbi.1997.0193" @default.
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