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Functional CB2 type cannabinoid receptors at CNS synapses.

Nicola H Morgan1, Ian M Stanford, Gavin L Woodhall

  • 1Biomedical Sciences, School of Life & Health Sciences, Aston University, Aston Triangle, Birmingham B4 7ET, UK.

Neuropharmacology
|July 21, 2009
PubMed
Summary
This summary is machine-generated.

Cannabinoid receptor type 2 (CB2R) is functionally present at central nervous system (CNS) synapses, not just in the periphery. This study provides pharmacological evidence for CB2R

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Area of Science:

  • Neuroscience
  • Pharmacology
  • Cannabinoid research

Background:

  • Cannabinoid receptors in the CNS were thought to be primarily CB1R, with CB2R limited to glia and peripheral tissues.
  • Emerging evidence suggests neuronal expression of CB2R in the CNS.

Purpose of the Study:

  • To investigate the functional presence and role of CB2R at neuronal synapses in the rat medial entorhinal cortex.
  • To determine if CB2R mediates GABAergic inhibition modulated by endogenous cannabinoids.

Main Methods:

  • Pharmacological blockade and activation of cannabinoid receptors (CB1R and CB2R) in rat brain slices.
  • Administration of specific CB2R agonists (JWH-133) and inverse agonists (AM-630, JTE-907).
  • Analysis of miniature inhibitory postsynaptic currents (mIPSCs) to assess GABAergic neurotransmission.

Main Results:

  • Blockade of CB1R did not fully explain the effects of 2-arachidonoylglycerol (2-AG) on GABAergic inhibition.
  • CB2R agonist JWH-133 mimicked 2-AG's suppressive effects, which were reversed by CB2R inverse agonist AM-630.
  • CB2R inverse agonist JTE-907 increased GABAergic neurotransmission, indicating functional CB2R at CNS synapses.
  • CB2R modulation of GABA release was dependent on action potentials.

Conclusions:

  • Functional CB2 receptors are present at CNS synapses, playing a role in regulating GABAergic inhibition.
  • These findings challenge the traditional view of cannabinoid receptor distribution and function in the brain.
  • CB2R represents a potential therapeutic target for CNS disorders involving GABAergic neurotransmission.