Role of hepatic STAT3 in brain-insulin action on hepatic glucose production

Cell Metab. 2006 Apr;3(4):267-75. doi: 10.1016/j.cmet.2006.02.009.


STAT3 regulates glucose homeostasis by suppressing the expression of gluconeogenic genes in the liver. The mechanism by which hepatic STAT3 is regulated by nutritional or hormonal status has remained unknown, however. Here, we show that an increase in the plasma insulin concentration, achieved either by glucose administration or by intravenous insulin infusion, stimulates tyrosine phosphorylation of STAT3 in the liver. This effect of insulin was mediated by the hormone's effects in the brain, and the increase in hepatic IL-6 induced by the brain-insulin action is essential for the activation of STAT3. The inhibition of hepatic glucose production and of expression of gluconeogenic genes induced by intracerebral ventricular insulin infusion was impaired in mice with liver-specific STAT3 deficiency or in mice with IL-6 deficiency. These results thus indicate that IL-6-STAT3 signaling in the liver contributes to insulin action in the brain, leading to the suppression of hepatic glucose production.

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Animals
  • Brain / metabolism*
  • Enzyme Activation
  • Gluconeogenesis
  • Glucose / metabolism*
  • Glucose / pharmacology
  • Glucose Clamp Technique
  • Glucose-6-Phosphatase / physiology
  • Homeostasis
  • Insulin / administration & dosage
  • Insulin / blood
  • Insulin / pharmacology
  • Insulin / physiology*
  • Insulin Resistance
  • Interleukin-6 / analysis
  • Interleukin-6 / physiology
  • Kupffer Cells / chemistry
  • Kupffer Cells / physiology
  • Liver / metabolism*
  • Male
  • Mice
  • Mice, Inbred C57BL
  • Phosphoenolpyruvate Carboxylase / physiology
  • Phosphorylation
  • Receptor, Insulin / physiology
  • STAT3 Transcription Factor / metabolism*
  • Signal Transduction


  • Insulin
  • Interleukin-6
  • STAT3 Transcription Factor
  • Stat3 protein, mouse
  • Receptor, Insulin
  • Glucose-6-Phosphatase
  • Phosphoenolpyruvate Carboxylase
  • Glucose