SIRT6 Promotes Hepatic Beta-Oxidation via Activation of PPARα.

Published

Journal Article

The pro-longevity enzyme SIRT6 regulates various metabolic pathways. Gene expression analyses in SIRT6 heterozygotic mice identify significant decreases in PPARα signaling, known to regulate multiple metabolic pathways. SIRT6 binds PPARα and its response element within promoter regions and activates gene transcription. Sirt6+/- results in significantly reduced PPARα-induced β-oxidation and its metabolites and reduced alanine and lactate levels, while inducing pyruvate oxidation. Reciprocally, starved SIRT6 transgenic mice show increased pyruvate, acetylcarnitine, and glycerol levels and significantly induce β-oxidation genes in a PPARα-dependent manner. Furthermore, SIRT6 mediates PPARα inhibition of SREBP-dependent cholesterol and triglyceride synthesis. Mechanistically, SIRT6 binds PPARα coactivator NCOA2 and decreases liver NCOA2 K780 acetylation, which stimulates its activation of PPARα in a SIRT6-dependent manner. These coordinated SIRT6 activities lead to regulation of whole-body respiratory exchange ratio and liver fat content, revealing the interactions whereby SIRT6 synchronizes various metabolic pathways, and suggest a mechanism by which SIRT6 maintains healthy liver.

Full Text

Duke Authors

Cited Authors

  • Naiman, S; Huynh, FK; Gil, R; Glick, Y; Shahar, Y; Touitou, N; Nahum, L; Avivi, MY; Roichman, A; Kanfi, Y; Gertler, AA; Doniger, T; Ilkayeva, OR; Abramovich, I; Yaron, O; Lerrer, B; Gottlieb, E; Harris, RA; Gerber, D; Hirschey, MD; Cohen, HY

Published Date

  • December 17, 2019

Published In

Volume / Issue

  • 29 / 12

Start / End Page

  • 4127 - 4143.e8

PubMed ID

  • 31851938

Pubmed Central ID

  • 31851938

Electronic International Standard Serial Number (EISSN)

  • 2211-1247

Digital Object Identifier (DOI)

  • 10.1016/j.celrep.2019.11.067

Language

  • eng

Conference Location

  • United States