Antidepressant-like effect of cannabidiol injection into the ventral medial prefrontal cortex-Possible involvement of 5-HT1A and CB1 receptors

Behavioural Brain Research
A G SartimSâmia R L Joca

Abstract

Systemic administration of cannabidiol (CBD), the main non-psychotomimetic constituent of Cannabis sativa, induces antidepressant-like effects. The mechanism of action of CBD is thought to involve the activation of 5-HT1A receptors and the modulation of endocannabinoid levels with subsequent CB1 activation. The brain regions involved in CBD-induced antidepressant-like effects remain unknown. The ventral medial prefrontal cortex (vmPFC), which includes the infralimbic (IL) and prelimbic (PL) subregions, receives dense serotonergic innervation and plays a significant role in stress responses. To test the hypothesis that the administration of CBD into the IL or PL would induce an antidepressant-like effect through 5-HT1A and CB1 activation. Rats received intra-IL or -PL microinjections of CBD (10-60 nmol/side), 8-OH-DPAT (5-HT1A agonist, 5-10 nmol/side), anandamide (AEA, 0.5 pmol/side) or vehicle (0.2 μl/side) and were submitted to the forced swimming (FST) or to the open field (OFT) tests. Independent CBD-treated groups were pre-treated with WAY100635 (10, 30 nmol/side, 5-HT1A antagonist) or AM251 (10 pmol/side, CB1 antagonist) and submitted to the same tests. An additional group was treated with WAY100635 followed by anandamide....Continue Reading

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