Down-regulation of cholinergic signaling in the habenula induces anhedonia-like behavior

Sci Rep. 2017 Apr 18;7(1):900. doi: 10.1038/s41598-017-01088-6.


Dysfunction of cholinergic signaling in the brain has long been believed to be associated with depressive disorders. However, the functional impact of habenular cholinergic signaling on the specified depressive behaviors is not well understood. Here, we demonstrated that the expression levels of cholinergic signaling genes (CHAT, VACHT, CHT, CHRNA3, CHRNB3 and CHRNB4) were down-regulated in a chronic restraint stress (CRS) rat model of depression, in which rats display depression-like behaviors such as anhedonia and mood despair. Moreover, knockdown of CHAT in the rat habenula was sufficient to evoke anhedonia-like behavior. The anhedonia-like behavior induced by CHAT knockdown was not reversed by chronic administration of the selective serotonin reuptake inhibitor fluoxetine. To determine whether habenular cholinergic signaling is associated with regulation of dopamine neurons in the ventral tegmental area (VTA) and serotonin neurons in the dorsal raphe nucleus (DRN), we used CHAT::cre transgenic mice expressing the Designer Receptors Exclusively Activated by Designer Drugs (DREADD). Pharmacogenetic activation of habenular cholinergic neurons induces the excitation of dopamine neurons in the VTA and reduces the immunoreactivity of 5-hydroxytryptamine (5-HT) in the DRN. Habenular cholinergic gene down-regulation was recapitulated in the postmortem habenula of suicide victims diagnosed with major depressive disorder (MDD).

Publication types

  • Research Support, Non-U.S. Gov't

MeSH terms

  • Acetylcholine / metabolism*
  • Anhedonia*
  • Animals
  • Cholinergic Agonists / pharmacology
  • Cholinergic Antagonists / pharmacology
  • Cholinergic Neurons / drug effects
  • Cholinergic Neurons / metabolism*
  • Designer Drugs / pharmacology
  • Dopaminergic Neurons / metabolism
  • Habenula / cytology
  • Habenula / metabolism*
  • Habenula / physiology
  • Humans
  • Male
  • Rats
  • Rats, Sprague-Dawley
  • Receptors, Cholinergic / genetics
  • Receptors, Cholinergic / metabolism*
  • Signal Transduction*
  • Ventral Tegmental Area / cytology
  • Ventral Tegmental Area / metabolism
  • Ventral Tegmental Area / physiology
  • Vesicular Acetylcholine Transport Proteins / genetics
  • Vesicular Acetylcholine Transport Proteins / metabolism*


  • Cholinergic Agonists
  • Cholinergic Antagonists
  • Designer Drugs
  • Receptors, Cholinergic
  • Vesicular Acetylcholine Transport Proteins
  • Acetylcholine