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Using the endogenous cannabinoid receptor agonist anandamide, the synthetic agonist CP 55940 [[1alpha,2beta(R)5alpha]-(-)-5-(1,1-dimethylheptyl+ ++)-2-[5-hydroxy-2-(3-hydroxypropyl)cyclohexyl]phenol], and the specific antagonist SR 141716 [N-(piperidin-1-yl)-5-(4-chlorophenyl)-1-(2,4-dichlorophenyl)-4-me thyl-1H-pyrazole-3-carboxamide hydrochloride], second messenger activation of the central cannabinoid receptor (CB1) was examined in rat striatal and cortical slices. The effects of these cannabinoid ligands on electrically evoked dopamine (DA) release from [3H] dopamine-prelabelled striatal slices were also investigated. CP 55940 (1 microM) and anandamide (10 microM) caused significant reductions in forskolin-stimulated cyclic AMP accumulation in rat striatal slices, which were reversed in the presence of SR 141716 (1 microM). CP 55940 (1 microM) had no effect on either KCl- or neurotransmitter-stimulated 3H-inositol phosphate accumulation in rat cortical slices. CP 55940 and anandamide caused significant reductions in the release of dopamine after electrical stimulation of [3H]dopamine-prelabelied striatal slices, which were antagonised by SR 141716. SR 141716 alone had no effect on electrically evoked dopamine release from rat striatal slices. These data indicate that the CB1 receptors in rat striatum are negatively linked to adenylyl cyclase and dopamine release. That the CB1 receptor may influence dopamine release in the striatum suggests that cannabinoids play a modulatory role in dopaminergic neuronal pathways.
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D A Kendall
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