Do the effects of cannabis on the hippocampus and striatum increase risk for psychosis?

Yusuf Daniju, Matthijs G. Bossong, Kaz Brandt, Paul Allen

Research output: Contribution to journalReview article

Abstract

Cannabis use is associated with increased risk of psychotic symptoms and in a small number of cases it can lead to psychoses. This review examines the neurobiological mechanisms that mediate the link between cannabis use and psychosis risk. We use an established preclinical model of psychosis, the methylazoxymethanol acetate (MAM) rodent model, as a framework to examine if psychosis risk in some cannabis users is mediated by the effects of cannabis on the hippocampus, and this region’s role in the regulation of mesolimbic dopamine. We also examine how cannabis affects excitatory neurotransmission known to regulate hippocampal neural activity and output. Whilst there is clear evidence that cannabis/cannabinoids can affect hippocampal and medial temporal lobe function and structure, the evidence that cannabis/cannabinoids increase striatal dopamine function is less robust. There is limited evidence that cannabis use affects cortical and striatal glutamate levels, but there are currently too few studies to draw firm conclusions. Future work is needed to test the MAM model in relation to cannabis using multimodal neuroimaging approaches. © 2020, Published by Elsevier Ltd. All rights reserved. The attached document (embargoed until 11/02/2021) is an author produced version of a paper published in NEUROSCIENCE & BIOBEHAVIOURAL REVIEWS uploaded in accordance with the publisher’s self-archiving policy. The final published version (version of record) is available online at the link. Some minor differences between this version and the final published version may remain. We suggest you refer to the final published version should you wish to cite from it.
Original languageEnglish
Pages (from-to)324-335
Number of pages12
JournalNeuroscience & Biobehavioral Reviews
Volume112
Issue numberMay 2020
DOIs
Publication statusPublished - 11 Feb 2020

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