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Hepatic SREBP-2 and cholesterol biosynthesis are regulated by FoxO3 and Sirt6.


ABSTRACT: Cholesterol homeostasis is crucial for cellular function and organismal health. The key regulator for the cholesterol biosynthesis is sterol-regulatory element binding protein (SREBP)-2. The biochemical process and physiological function of SREBP-2 have been well characterized; however, it is not clear how this gene is epigenetically regulated. Here we have identified sirtuin (Sirt)6 as a critical factor for Srebp2 gene regulation. Hepatic deficiency of Sirt6 in mice leads to elevated cholesterol levels. On the mechanistic level, Sirt6 is recruited by forkhead box O (FoxO)3 to the Srebp2 gene promoter where Sirt6 deacetylates histone H3 at lysines 9 and 56, thereby promoting a repressive chromatin state. Remarkably, Sirt6 or FoxO3 overexpression improves hypercholesterolemia in diet-induced or genetically obese mice. In summary, our data suggest an important role of hepatic Sirt6 and FoxO3 in the regulation of cholesterol homeostasis.

SUBMITTER: Tao R 

PROVIDER: S-EPMC3770087 | biostudies-literature | 2013 Oct

REPOSITORIES: biostudies-literature

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Hepatic SREBP-2 and cholesterol biosynthesis are regulated by FoxO3 and Sirt6.

Tao Rongya R   Xiong Xiwen X   DePinho Ronald A RA   Deng Chu-Xia CX   Dong X Charlie XC  

Journal of lipid research 20130723 10


Cholesterol homeostasis is crucial for cellular function and organismal health. The key regulator for the cholesterol biosynthesis is sterol-regulatory element binding protein (SREBP)-2. The biochemical process and physiological function of SREBP-2 have been well characterized; however, it is not clear how this gene is epigenetically regulated. Here we have identified sirtuin (Sirt)6 as a critical factor for Srebp2 gene regulation. Hepatic deficiency of Sirt6 in mice leads to elevated cholestero  ...[more]

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