Regulator of Calcineurin 1 helps coordinate whole-body metabolism and thermogenesis

EMBO Rep. 2018 Dec;19(12):e44706. doi: 10.15252/embr.201744706. Epub 2018 Nov 2.

Abstract

Increasing non-shivering thermogenesis (NST), which expends calories as heat rather than storing them as fat, is championed as an effective way to combat obesity and metabolic disease. Innate mechanisms constraining the capacity for NST present a fundamental limitation to this approach, yet are not well understood. Here, we provide evidence that Regulator of Calcineurin 1 (RCAN1), a feedback inhibitor of the calcium-activated protein phosphatase calcineurin (CN), acts to suppress two distinctly different mechanisms of non-shivering thermogenesis (NST): one involving the activation of UCP1 expression in white adipose tissue, the other mediated by sarcolipin (SLN) in skeletal muscle. UCP1 generates heat at the expense of reducing ATP production, whereas SLN increases ATP consumption to generate heat. Gene expression profiles demonstrate a high correlation between Rcan1 expression and metabolic syndrome. On an evolutionary timescale, in the context of limited food resources, systemic suppression of prolonged NST by RCAN1 might have been beneficial; however, in the face of caloric abundance, RCAN1-mediated suppression of these adaptive avenues of energy expenditure may now contribute to the growing epidemic of obesity.

Keywords: Down syndrome; RCAN1; adaptive thermogenesis; obesity; sarcolipin.

Publication types

  • Research Support, N.I.H., Extramural
  • Research Support, Non-U.S. Gov't

MeSH terms

  • 3T3-L1 Cells
  • Adipocytes / cytology
  • Adipocytes / drug effects
  • Adipocytes / metabolism
  • Adipose Tissue / metabolism
  • Adipose Tissue, Beige / drug effects
  • Adipose Tissue, Beige / metabolism
  • Adipose Tissue, White / drug effects
  • Adipose Tissue, White / metabolism
  • Adrenergic Agents / pharmacology
  • Animals
  • Calcineurin / metabolism
  • Calcium-Binding Proteins
  • Cell Differentiation / drug effects
  • Cold Temperature
  • Female
  • Insulin Resistance
  • Intracellular Signaling Peptides and Proteins / deficiency
  • Intracellular Signaling Peptides and Proteins / metabolism*
  • Lipid Metabolism / drug effects
  • Liver / metabolism
  • Male
  • Metabolic Syndrome / metabolism
  • Metabolism* / drug effects
  • Mice
  • Mice, Knockout
  • Muscle Proteins / deficiency
  • Muscle Proteins / genetics
  • Muscle Proteins / metabolism*
  • Muscle, Skeletal / metabolism
  • Muscle, Striated / metabolism
  • Obesity / metabolism
  • Obesity / pathology
  • Peroxisome Proliferator-Activated Receptor Gamma Coactivator 1-alpha / metabolism
  • Promoter Regions, Genetic / genetics
  • Proteolipids / genetics
  • Proteolipids / metabolism
  • RNA, Messenger / genetics
  • RNA, Messenger / metabolism
  • Thermogenesis* / drug effects
  • Uncoupling Protein 1 / metabolism

Substances

  • Adrenergic Agents
  • Calcium-Binding Proteins
  • DSCR1 protein, mouse
  • Intracellular Signaling Peptides and Proteins
  • Muscle Proteins
  • Peroxisome Proliferator-Activated Receptor Gamma Coactivator 1-alpha
  • Proteolipids
  • RNA, Messenger
  • Uncoupling Protein 1
  • sarcolipin
  • Calcineurin