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

Endocrinology
Matthew J DuringLei Cao

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 t...Continue Reading

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