Sirtuin 3-mediated pyruvate dehydrogenase activity determines brown adipocytes phenotype under high-salt conditions

Cell Death Dis. 2019 Aug 14;10(8):614. doi: 10.1038/s41419-019-1834-4.

Abstract

Previous study indicated that Sirtuin 3 (SIRT3) is a central regulator of adaptive thermogenesis in brown adipose tissue (BAT). Here we investigate the role of SIRT3 in the modulation of cellular phenotype in BAT under high salt intake (HS). HS downregulated SIRT3 level in BAT, accompanied by decreased oxygen consumption rate, and caused a severe loss of BAT characteristics. Mechanically, SIRT3 interacted with pyruvate dehydrogenase E1α (PDHA1) and deacetylated Lys-83 both in vitro and in vivo under HS. In parallel, HS suppressed salt-induced kinase (Sik) 2 phosphorylation. Silencing Sik2 further diminished SIRT3 activity and enhanced acetylation of PDHA1 K83 level. Reconstruction of SIRT3 restored PDH activity and thermogenic markers expression in differentiated brown adipocytes from SIRT3 knockout (KO) mice. In addition, loss of SIRT3 induced selective remodelling of phospholipids and glycerolipids in BAT exposure to HS. These data indicate that SIRT3 is an essential enzymatic switch that controls brown adipose cell phenotype.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Acetylation / drug effects
  • Adipocytes, Brown / drug effects
  • Adipocytes, Brown / metabolism*
  • Animals
  • Mice
  • Mice, Knockout
  • Oxidation-Reduction
  • Oxygen Consumption / drug effects
  • Oxygen Consumption / genetics
  • Phenotype
  • Phosphorylation / drug effects
  • Protein Serine-Threonine Kinases / antagonists & inhibitors
  • Protein Serine-Threonine Kinases / drug effects
  • Protein Serine-Threonine Kinases / genetics*
  • Pyruvate Dehydrogenase (Lipoamide) / genetics*
  • Salts / pharmacology
  • Sirtuin 3 / genetics*
  • Thermogenesis / drug effects
  • Thermogenesis / genetics*

Substances

  • Salts
  • Sirt3 protein, mouse
  • Pyruvate Dehydrogenase (Lipoamide)
  • pyruvate dehydrogenase E1alpha subunit
  • salt-inducible kinase-2, mouse
  • Protein Serine-Threonine Kinases
  • Sirtuin 3