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Adolescent cannabis use and psychosis: epidemiology and neurodevelopmental models

Daniel T Malone, Matthew N Hill, Tiziana Rubino

British Journal of Pharmacology June 1, 2010 DOI: 10.1111/j.1476-5381.2010.00721.x (opens in new tab)

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AI-extracted from the abstract
Characteristics Review Peer reviewed
Topics Cannabis
Key findings Argues that adolescent cannabis exposure, through its effects on the endocannabinoid system during critical brain development, may increase susceptibility to schizophrenia and other psychoses, with proposed mechanisms supported by human and animal studies.

Abstract

Cannabis is one of the most widely used illicit drugs among adolescents, and most users first experiment with it in adolescence. Adolescence is a critical phase for brain development, characterized by neuronal maturation and rearrangement processes, such as myelination, synaptic pruning and dendritic plasticity. The endocannabinoid system plays an important role in fundamental brain developmental processes such as neuronal cell proliferation, migration and differentiation. Therefore changes in endocannabinoid activity during this specific developmental phase, induced by the psychoactive component of marijuana, Δ9‐tetrahydrocannabinol, might lead to subtle but lasting neurobiological changes that can affect brain functions and behaviour. In this review, we outline recent research into the endocannabinoid system focusing on the relationships between adolescent exposure to cannabinoids and increased risk for certain neuropsychiatric diseases such as schizophrenia, as highlighted by both human and animal studies. Particular emphasis will be given to the possible mechanisms by which adolescent cannabis consumption could render a person more susceptible to developing psychoses such as schizophrenia.This article is part of a themed issue on Cannabinoids. To view the editorial for this themed issue visithttp://dx.doi.org/10.1111/j.1476‐5381.2010.00831.x

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