Expression of functional cannabinoid CB2 receptor in VTA dopamine neurons in rats

Hai Ying Zhang, Ming Gao, Hui Shen, Guo Hua Bi, Hong Ju Yang, Qing Rong Liu, Jie Wu, Eliot L. Gardner, Antonello Bonci, Zheng Xiong Xi

Research output: Contribution to journalArticlepeer-review

Abstract

We have recently reported the expression of functional cannabinoid CB2 receptors (CB2Rs) in midbrain dopamine (DA) neurons in mice. However, little is known whether CB2Rs are similarly expressed in rat brain because significant species differences in CB2R structures and expression are found. In situ hybridization and immunohistochemical assays detected CB2 gene and receptors in DA neurons of the ventral tegmental area (VTA), which was up-regulated in cocaine self-administration rats. Electrophysiological studies demonstrated that activation of CB2Rs by JWH133 inhibited VTA DA neuronal firing in single dissociated neurons. Systemic administration of JWH133 failed to alter, while local administration of JWH133 into the nucleus accumbens inhibited cocaine-enhanced extracellular DA and i.v. cocaine self-administration. This effect was blocked by AM630, a selective CB2R antagonist. These data suggest that CB2Rs are expressed in VTA DA neurons and functionally modulate DA neuronal activities and cocaine self-administration behavior in rats.

Original languageEnglish (US)
Pages (from-to)752-765
Number of pages14
JournalAddiction Biology
Volume22
Issue number3
DOIs
StatePublished - May 1 2017

Keywords

  • CB receptor
  • JWH133
  • cannabinoid
  • cocaine
  • dopamine
  • self-administration

ASJC Scopus subject areas

  • Medicine (miscellaneous)
  • Pharmacology
  • Psychiatry and Mental health

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