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Acute effects of Δ9-tetrahydrocannabinol and cannabidiol on auditory mismatch negativity

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Abstract

Rationale

Mismatch negativity (MMN) is a candidate endophenotype for schizophrenia subserved by N-methyl-D-aspartate receptor (NMDAR) function and there is increasing evidence that prolonged cannabis use adversely affects MMN generation. Few human studies have investigated the acute effects of cannabinoids on brain-based biomarkers of NMDAR function and synaptic plasticity.

Objectives

The current study investigated the acute effects of Δ9-tetrahydrocannabinol (THC) and cannabidiol (CBD) alone and in combination on the mismatch negativity (MMN).

Methods

In a randomised, double-blind, crossover placebo-controlled study, 18 frequent and 18 less-frequent cannabis users underwent 5 randomised drug sessions administered via vaporiser: (1) placebo; (2) THC 8 mg; (3) CBD 400 mg; (4) THC 8 mg + CBD 4 mg [THC + CBDlow]; (5) THC 12 mg + CBD 400 mg [THC + CBDhigh]. Participants completed a multifeature MMN auditory oddball paradigm with duration, frequency and intensity deviants (6% each).

Results

Relative to placebo, both THC and CBD were observed to increase duration and intensity MMN amplitude in less-frequent users, and THC also increased frequency MMN in this group. The addition of low-dose CBD added to THC attenuated the effect of THC on duration and intensity MMN amplitude in less-frequent users. The same pattern of effects was observed following high-dose CBD added to THC on duration and frequency MMN in frequent users.

Conclusions

The pattern of effects following CBD combined with THC on MMN may be subserved by different underlying neurobiological interactions within the endocannabinoid system that vary as a function of prior cannabis exposure. These results highlight the complex interplay between the acute effects of exogenous cannabinoids and NMDAR function. Further research is needed to determine how this process normalises after the acute effects dissipate and following repeated acute exposure.

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Acknowledgements

The authors are grateful to (1) Professor Antonio Zuardi and Dr Arno Hazekamp for advice around dosing and drug administration at the commencement of the study and (2) to Storz & Bickel, Tuttlingen, Germany, for supplying a Volcano® Vaporiser used in this study. Cannabinoid compounds were purchased from STI Pharmaceuticals, UK. The authors are grateful to Clare Bate, Camilla Beale, Andrew Bonney, Gary Chan, Francesca Fernandez, Sarah Gallagher, David Garne, Madeleine Godber, Stuart Johnstone, Lisa Lole, Elke Macdonald, David Martelozzo, Philip McGuire, Jelena Novakovic, Nagesh Pai, Gabrielle Puckett, Karina Rovere, Kuna Rueb, Beth Shaw and Lara Tramazzo for assistance with participant, trial and data management and logistics.

Funding

This research was supported by the National Health and Medical Research Council of Australia (NHMRC Project grant 1007593). NS was supported by the Australian Research Council (ARC Future Fellowship FT110100752) and LMG was supported by a National Institutes Grant (NIG). Neither the NHMRC, ARC nor the Australian Government had any further role in study design; in the collection, analysis and interpretation of data; in the writing of the report; or in the decision to submit the paper for publication.

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Correspondence to Lisa-Marie Greenwood.

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The authors declare no competing interests.

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This article belongs to a Special Issue on Cannabis and Cannabinoids

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Greenwood, LM., Broyd, S.J., van Hell, H.H. et al. Acute effects of Δ9-tetrahydrocannabinol and cannabidiol on auditory mismatch negativity. Psychopharmacology 239, 1409–1424 (2022). https://doi.org/10.1007/s00213-021-05997-3

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  • DOI: https://doi.org/10.1007/s00213-021-05997-3

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