Chronic cocaine sensitizes striatal GABAergic synapses to the stimulation of cannabinoid CB1 receptors

Diego Centonze, Silvia Rossi, Valentina De Chiara, Chiara Prosperetti, Natalia Battista, Giorgio Bernardi, Nicola B. Mercuri, Alessandro Usiello, Mauro Maccarrone

Research output: Contribution to journalArticle

Abstract

Behavioural studies indicate that cannabinoid receptors are implicated in cocaine addiction. The synaptic underpinning of cocaine-cannabinoid receptor interaction is however, obscure. We have studied electrophysiologically the sensitivity of cannabinoid receptors modulating synaptic transmission in the striatum of rats exposed to cocaine. One-day treatment with cocaine did not modify the synaptic response to HU210, a cannabinoid CB1 receptor agonist. Seven days cocaine-treatment, conversely, caused conditioned place preference, and sensitized striatal GABAergic synapses to the presynaptic effect of cannabinoid CB1 receptor stimulation. The cannabinoid receptor-induced modulation of glutamate transmission was unaltered by cocaine. Furthermore, the effects of chronic cocaine on cannabinoid-mediated regulation of striatal GABA synapses were attenuated one week after the discontinuation of cocaine, and absent two weeks later, indicating the progressive reversibility of the adaptations of cannabinoid system during abstinence of drug consumption. Our data support the concept that modulation of cannabinoid receptors might be useful against drug abuse.

Original languageEnglish
Pages (from-to)1631-1640
Number of pages10
JournalEuropean Journal of Neuroscience
Volume25
Issue number6
DOIs
Publication statusPublished - Mar 2007

Keywords

  • Addiction
  • Dopamine
  • Electrophysiology
  • Habit
  • IPSC

ASJC Scopus subject areas

  • Neuroscience(all)

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