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Psychopharmacology (Berl). 2018 Feb;235(2):447-458. doi: 10.1007/s00213-017-4766-7. Epub 2017 Oct 24.

Phytocannabinoids modulate emotional memory processing through interactions with the ventral hippocampus and mesolimbic dopamine system: implications for neuropsychiatric pathology.

Author information

1
Department of Anatomy and Cell Biology, University of Western Ontario, London, ON, N6A 3K7, Canada.
2
Department of Psychiatry, Schulich School of Medicine & Dentistry, University of Western Ontario, London, ON, Canada.
3
Department of Anatomy and Cell Biology, University of Western Ontario, London, ON, N6A 3K7, Canada. steven.laviolette@schulich.uwo.ca.
4
Department of Psychiatry, Schulich School of Medicine & Dentistry, University of Western Ontario, London, ON, Canada. steven.laviolette@schulich.uwo.ca.

Abstract

Growing clinical and preclinical evidence suggests a potential role for the phytocannabinoid cannabidiol (CBD) as a pharmacotherapy for various neuropsychiatric disorders. In contrast, delta-9-tetrahydrocannabinol (THC), the primary psychoactive component in cannabis, is associated with acute and neurodevelopmental propsychotic side effects through its interaction with central cannabinoid type 1 receptors (CB1Rs). CB1R stimulation in the ventral hippocampus (VHipp) potentiates affective memory formation through inputs to the mesolimbic dopamine (DA) system, thereby altering emotional salience attribution. These changes in DA activity and salience attribution, evoked by dysfunctional VHipp regulatory actions and THC exposure, could predispose susceptible individuals to psychotic symptoms. Although THC can accelerate the onset of schizophrenia, CBD displays antipsychotic properties, can prevent the acquisition of emotionally irrelevant memories, and reverses amphetamine-induced neuronal sensitization through selective phosphorylation of the mechanistic target of rapamycin (mTOR) molecular signaling pathway. This review summarizes clinical and preclinical evidence demonstrating that distinct phytocannabinoids act within the VHipp and associated corticolimbic structures to modulate emotional memory processing through changes in mesolimbic DA activity states, salience attribution, and signal transduction pathways associated with schizophrenia-related pathology.

KEYWORDS:

Cannabidiol; Dopamine; Emotional salience; Endocannabinoid; Memory; Psychosis; Rapamycin; Schizophrenia; THC

PMID:
29063964
DOI:
10.1007/s00213-017-4766-7
[Indexed for MEDLINE]

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