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5-HT2CRs expressed by pro-opiomelanocortin neurons regulate insulin sensitivity in liver

Yong Xu1, Eric D Berglund, Jong-Woo Sohn

  • 1Division of Hypothalamic Research and Department of Internal Medicine, UT Southwestern Medical Center, Dallas, Texas, USA.

Nature Neuroscience
|November 2, 2010
PubMed

Insights

Mice lacking serotonin 2C receptors (5-HT2CRs) developed insulin resistance. Reintroducing these receptors in pro-opiomelanocortin (POMC) neurons restored insulin sensitivity, highlighting POMC neurons

Area of Science:

  • Neuroendocrinology
  • Metabolic Regulation
  • Molecular Psychiatry

Background:

  • Serotonin 2C receptors (5-HT2CRs) are implicated in appetite and mood regulation.
  • The role of 5-HT2CRs in hepatic insulin sensitivity and glucose homeostasis remains incompletely understood.
  • Pro-opiomelanocortin (POMC) neurons are key regulators of energy balance.

Purpose of the Study:

  • To investigate the role of 5-HT2CRs in hepatic insulin resistance.
  • To determine if POMC neurons are the critical site for 5-HT2CR action in regulating glucose homeostasis.
  • To assess the therapeutic potential of targeting 5-HT2CRs for diabetes.

Main Methods:

  • Generation of mice lacking functional 5-HT2CRs.
  • Selective re-expression of 5-HT2CRs in POMC neurons using genetic techniques.
  • Assessment of insulin sensitivity and glucose tolerance in genetically modified mice.
  • Pharmacological studies using a 5-HT2CR agonist (meta-chlorophenylpiperazine).

Main Results:

  • Mice deficient in 5-HT2CRs exhibited significant hepatic insulin resistance.
  • Re-expression of 5-HT2CRs specifically in POMC neurons normalized insulin sensitivity and glucose homeostasis.
  • The anti-diabetic effects of a 5-HT2CR agonist were dependent on the presence of 5-HT2CRs in POMC neurons.

Conclusions:

  • 5-HT2CRs within POMC neurons are essential regulators of hepatic insulin sensitivity.
  • Targeting POMC neuron 5-HT2CRs represents a potential therapeutic strategy for type 2 diabetes.
  • These findings elucidate a novel neural pathway controlling glucose metabolism.

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