Adipose VEGF Links the White-to-Brown Fat Switch With Environmental, Genetic, and Pharmacological Stimuli in Male Mice

Endocrinology. 2015 Jun;156(6):2059-73. doi: 10.1210/en.2014-1905. Epub 2015 Mar 12.

Abstract

Living in an enriched environment (EE) decreases adiposity, increases energy expenditure, causes resistance to diet induced obesity, and induces brown-like (beige) cells in white fat via activating a hypothalamic-adipocyte axis. Here we report that EE stimulated vascular endothelial growth factor (VEGF) expression in a fat depot-specific manner prior to the emergence of beige cells. The VEGF up-regulation was independent of hypoxia but required intact sympathetic tone to the adipose tissue. Targeted adipose overexpression of VEGF reproduced the browning effect of EE. Adipose-specific VEGF knockout or pharmacological VEGF blockade with antibodies abolished the induction of beige cell by EE. Hypothalamic brain-derived neurotrophic factor stimulated by EE regulated the adipose VEGF expression, and VEGF signaling was essential to the hypothalamic brain-derived neurotrophic factor-induced white adipose tissue browning. Furthermore, VEGF signaling was essential to the beige cells induction by exercise, a β3-adrenergic agonist, and a peroxisome proliferator-activated receptor-γ ligand, suggesting a common downstream pathway integrating diverse upstream mechanisms. Exploiting this pathway may offer potential therapeutic interventions to obesity and metabolic diseases.

Publication types

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

MeSH terms

  • Adipose Tissue / metabolism*
  • Adipose Tissue, Brown / metabolism*
  • Adipose Tissue, White / metabolism*
  • Animals
  • Male
  • Mice
  • Mice, Inbred C57BL
  • Mice, Knockout
  • Reverse Transcriptase Polymerase Chain Reaction
  • Vascular Endothelial Growth Factor A / genetics
  • Vascular Endothelial Growth Factor A / metabolism*

Substances

  • Vascular Endothelial Growth Factor A