CBD reduced cocaine withdrawal symptoms and normalized brain gene changes in mice

What the researchers found

Mice undergoing spontaneous cocaine withdrawal showed increased motor activity, somatic signs, and anxiety. CBD normalized all these behavioral disturbances. At the molecular level, CBD blocked the cocaine-induced increase in dopamine transporter (DAT) and tyrosine hydroxylase (TH) gene expression in the VTA, regulated the decrease of CNR1, and further upregulated CNR2 gene expression in the nucleus accumbens.

Why it matters

Cocaine withdrawal causes severe anxiety and behavioral disruption that drives relapse. CBD's ability to address both behavioral symptoms and underlying molecular changes suggests it could be a comprehensive treatment candidate.

The numbers in context

Cocaine 15-60 mg/kg/day for 12 days; withdrawal at 6 hours; CBD 10, 20, 40 mg/kg tested; CBD normalized motor activity, somatic signs, and anxiety; blocked DAT and TH upregulation in VTA; regulated CNR1 decrease; upregulated CNR2 in nucleus accumbens

How the study worked

Male CD-1 mice received escalating cocaine doses (15-60 mg/kg/day) for 12 days. Spontaneous withdrawal was assessed 6 hours after the last dose. CBD (10, 20, 40 mg/kg) was tested on motor activity, somatic signs, and anxiety. Gene expression of DAT, TH, CNR1, and CNR2 was measured by real-time PCR.

What this study cannot tell us

Male mice only. Acute withdrawal (6 hours) may not represent the protracted withdrawal experienced by humans. CBD doses may not translate directly to human equivalents. Single cocaine withdrawal model; different cocaine exposure patterns could yield different results.

How to read the evidence

Well-designed animal study with both behavioral and molecular endpoints, but limited to male mice and acute withdrawal.

When this study was published

Published in 2021.

The bigger picture

The finding that CBD modulates both dopaminergic and endocannabinoid gene expression during cocaine withdrawal supports the concept that these two systems interact extensively, and that targeting the endocannabinoid system may be a viable strategy for cocaine addiction treatment.

Questions still open

• Would CBD be effective during protracted cocaine withdrawal or only the acute phase? Do the gene expression changes normalize permanently or only while CBD is present?

Common questions

Read the original research

Cannabidiol Modulates Behavioural and Gene Expression Alterations Induced by Spontaneous Cocaine Withdrawal.

Neurotherapeutics : the journal of the American Society for Experimental NeuroTherapeutics, 18(1), 615-623

Citation

Gasparyan, Ani; Navarrete, Francisco; Rodríguez-Arias, Marta; Miñarro, José; Manzanares, Jorge. (2021). Cannabidiol Modulates Behavioural and Gene Expression Alterations Induced by Spontaneous Cocaine Withdrawal.. Neurotherapeutics : the journal of the American Society for Experimental NeuroTherapeutics, 18(1), 615-623. https://doi.org/10.1007/s13311-020-00976-6

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