THC and CBD had age-dependent effects on tic-like behaviors in mice, with CBD potentially worsening tics in juveniles
In a mouse model of Tourette syndrome, THC reduced some repetitive behaviors but caused catalepsy at higher doses, while CBD had no benefit in juveniles and actually increased head twitching in both age groups.
Quick Facts
What This Study Found
THC dose-dependently reduced some DOI-induced repetitive behaviors (ear scratch > grooming > head twitch) differently in juvenile versus young adult mice. THC at 5 mg/kg caused catalepsy in controls and increased ear scratching in juveniles. CBD had no effect on DOI-induced ear scratching or grooming in juveniles and actually increased head twitching in both age groups.
Key Numbers
THC potency rank in young adults: ESR > grooming > HTR; in juveniles: ESR = grooming > HTR; THC 5 mg/kg caused catalepsy in controls; CBD increased HTR frequency in both ages; CBD had no benefit for ESR or grooming in juveniles
How They Did This
Juvenile and young adult mice received DOI (2,5-dimethoxy-4-iodoamphetamine) to induce tic-like repetitive behaviors (head twitch, ear scratch, grooming). Effects of THC and CBD at various doses were compared between age groups.
Why This Research Matters
Tourette syndrome has childhood onset and adults increasingly use medical cannabis for tics, but pediatric use is growing without age-specific evidence. This study reveals concerning age-dependent effects that could worsen symptoms in younger patients.
The Bigger Picture
The finding that CBD may increase rather than decrease tic-like behaviors challenges assumptions about its therapeutic potential in Tourette syndrome, particularly in children, and highlights the importance of age-specific pharmacological testing.
What This Study Doesn't Tell Us
DOI-induced repetitive behaviors are an imperfect model of Tourette syndrome tics. Mouse responses may not predict human responses. Limited dose range tested. Acute administration only; chronic effects unknown.
Questions This Raises
- ?Could low-dose THC reduce peripheral tics without causing catalepsy?
- ?Why does CBD increase head twitching, and does this translate to tic worsening in human patients?
Trust & Context
- Key Stat:
- CBD increased head twitch frequency in both juvenile and young adult mice
- Evidence Grade:
- Systematic age comparison in a relevant animal model, but DOI model has limited translational validity for Tourette syndrome.
- Study Age:
- Published in 2021.
- Original Title:
- Different responses of repetitive behaviours in juvenile and young adult mice to Δ9 -tetrahydrocannabinol and cannabidiol may affect decision making for Tourette syndrome.
- Published In:
- British journal of pharmacology, 178(3), 614-625 (2021)
- Authors:
- Gorberg, Victoria(3), McCaffery, Peter(3), Anavi-Goffer, Sharon(3)
- Database ID:
- RTHC-03166
Evidence Hierarchy
Tests effects in animals (usually mice or rats), not humans.
What do these levels mean? →Frequently Asked Questions
Can cannabis help with Tourette syndrome tics?
THC reduced some tic-like behaviors in this mouse model but caused concerning side effects at higher doses including catalepsy. The therapeutic window was very narrow, especially in juveniles, suggesting careful dose titration would be needed.
Is CBD safe for children with tics?
In this mouse model, CBD showed no benefit for tic-like behaviors in juveniles and actually increased head twitching in both age groups. The authors caution that CBD "may not effectively treat motor tics in children and may even exacerbate tics."
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Cite This Study
https://rethinkthc.com/research/RTHC-03166APA
Gorberg, Victoria; McCaffery, Peter; Anavi-Goffer, Sharon. (2021). Different responses of repetitive behaviours in juvenile and young adult mice to Δ9 -tetrahydrocannabinol and cannabidiol may affect decision making for Tourette syndrome.. British journal of pharmacology, 178(3), 614-625. https://doi.org/10.1111/bph.15302
MLA
Gorberg, Victoria, et al. "Different responses of repetitive behaviours in juvenile and young adult mice to Δ9 -tetrahydrocannabinol and cannabidiol may affect decision making for Tourette syndrome.." British journal of pharmacology, 2021. https://doi.org/10.1111/bph.15302
RethinkTHC
RethinkTHC Research Database. "Different responses of repetitive behaviours in juvenile and..." RTHC-03166. Retrieved from https://rethinkthc.com/research/gorberg-2021-different-responses-of-repetitive
Access the Original Study
Study data sourced from PubMed, a service of the U.S. National Library of Medicine, National Institutes of Health.
This study breakdown was produced by the RethinkTHC research team. We analyze and report published research findings without making health recommendations. All interpretations are based solely on the published abstract and study data.