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Plos Biology : Rev-erbα Participates in Circadian Srebp Signaling and Bile Acid Homeostasis, Volume 7

By Vidal-puig, Antonio J.

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Book Id: WPLBN0003930860
Format Type: PDF eBook :
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Reproduction Date: 2015

Title: Plos Biology : Rev-erbα Participates in Circadian Srebp Signaling and Bile Acid Homeostasis, Volume 7  
Author: Vidal-puig, Antonio J.
Volume: Volume 7
Language: English
Subject: Journals, Science, Biology
Collections: Periodicals: Journal and Magazine Collection (Contemporary), PLoS Biology
Historic
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Publisher: Plos

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Vidal-Puig, A. J. (n.d.). Plos Biology : Rev-erbα Participates in Circadian Srebp Signaling and Bile Acid Homeostasis, Volume 7. Retrieved from http://worldebooklibrary.org/


Description
Description : In mammals, many aspects of behavior and physiology, and in particular cellular metabolism, are coordinated by the circadian timing system. Molecular clocks are thought to rely on negative feedback loops in clock gene expression that engender oscillations in the accumulation of transcriptional regulatory proteins, such as the orphan receptor REV-ERBa. Circadian transcription factors then drive daily rhythms in the expression of clock-controlled output genes, for example genes encoding enzymes and regulators of cellular metabolism. To gain insight into clock output functions of REV-ERBa, we carried out genome-wide transcriptome profiling experiments with liver RNA from wild-type mice, Rev-erba knock-out mice, or REV-ERBa overexpressing mice. On the basis of these genetic loss- and gain-of-function experiments, we concluded that REV-ERBa participates in the circadian modulation of sterol regulatory element-binding protein (SREBP) activity, and thereby in the daily expression of SREBP target genes involved in cholesterol and lipid metabolism. This control is exerted via the cyclic transcription of Insig2, encoding a trans-membrane protein that sequesters SREBP proteins to the endoplasmic reticulum membranes and thereby interferes with the proteolytic activation of SREBPs in Golgi membranes. REV-ERBa also participates in the cyclic expression of cholesterol-7a-hydroxylase (CYP7A1), the rate-limiting enzyme in converting cholesterol to bile acids. Our findings suggest that this control acts via the stimulation of LXR nuclear receptors by cyclically produced oxysterols. In conclusion, our study suggests that rhythmic cholesterol and bile acid metabolism is not just driven by alternating feeding–fasting cycles, but also by REV-ERBa, a component of the circadian clockwork circuitry.

 

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