SIRT4 Represses Peroxisome Proliferator-activated Receptor α Activity to Suppress Hepatic Fat Oxidation

Overview

Journal Mol Cell Biol

Specialty Cell Biology

Date 2013 Sep 18

PMID 24043310

Citations 72

Authors

Gaelle Laurent

Vincent C J de Boer

Lydia W S Finley

Meredith Sweeney

Hong Lu

Thaddeus T Schug

Yana Cen

Seung Min Jeong

Xiaoling Li

Anthony A Sauve

Marcia C Haigis

Affiliations

Soon will be listed here.

Abstract

Sirtuins are a family of protein deacetylases, deacylases, and ADP-ribosyltransferases that regulate life span, control the onset of numerous age-associated diseases, and mediate metabolic homeostasis. We have uncovered a novel role for the mitochondrial sirtuin SIRT4 in the regulation of hepatic lipid metabolism during changes in nutrient availability. We show that SIRT4 levels decrease in the liver during fasting and that SIRT4 null mice display increased expression of hepatic peroxisome proliferator-activated receptor α (PPARα) target genes associated with fatty acid catabolism. Accordingly, primary hepatocytes from SIRT4 knockout (KO) mice exhibit higher rates of fatty acid oxidation than wild-type hepatocytes, and SIRT4 overexpression decreases fatty acid oxidation rates. The enhanced fatty acid oxidation observed in SIRT4 KO hepatocytes requires functional SIRT1, demonstrating a clear cross talk between mitochondrial and nuclear sirtuins. Thus, SIRT4 is a new component of mitochondrial signaling in the liver and functions as an important regulator of lipid metabolism.

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