Pharmaceutical Sciences Faculty Publications

Document Type

Article

Publication Date

11-1-2009

Journal Title

Cell Metabolism

ISSN

1932-7420

Volume

10

Issue

5

First Page

392

Last Page

404

DOI

10.1016/j.cmet.2009.09.009

PubMed ID

19883617

PubMed Central® ID

PMC2785075

Abstract

The nuclear bile acid receptor FXR is critical for regulation of lipid and glucose metabolism. Here, we report that FXR is a target of SIRT1, a deacetylase that mediates nutritional and hormonal modulation of hepatic metabolism. Lysine 217 of FXR is the major acetylation site targeted by p300 and SIRT1. Acetylation of FXR increases its stability but inhibits heterodimerization with RXRalpha, DNA binding, and transactivation activity. Downregulation of hepatic SIRT1 increased FXR acetylation with deleterious metabolic outcomes. Surprisingly, in mouse models of metabolic disease, FXR interaction with SIRT1 and p300 was dramatically altered, FXR acetylation levels were elevated, and overexpression of SIRT1 or resveratrol treatment reduced acetylated FXR levels. Our data demonstrate that FXR acetylation is normally dynamically regulated by p300 and SIRT1 but is constitutively elevated in metabolic disease states. Small molecules that inhibit FXR acetylation by targeting SIRT1 or p300 may be promising therapeutic agents for metabolic disorders.

Keywords

Acetylation, dimerization, liver diseases, protein, RNA

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