Both endocannabinoid-boosting drugs reduced anxiety-like behavior in mice without the sedation caused by THC
FAAH and MAGL inhibitors reduced compulsive marble-burying behavior in mice at doses that did not affect locomotion, while THC only reduced burying at sedating doses, suggesting endocannabinoid enhancement offers anxiolytic effects without sedation.
Quick Facts
What This Study Found
Researchers tested whether boosting either of the two main endocannabinoids could reduce anxiety-like behavior in a marble-burying test, a model relevant to compulsive behaviors in disorders like OCD.
The FAAH inhibitor PF-3845 (which boosts anandamide) and the MAGL inhibitor JZL184 (which boosts 2-AG) both reduced marble burying at doses that did not impair locomotor activity. The benzodiazepine diazepam also reduced burying.
In contrast, THC did not consistently reduce marble burying without also causing profound decreases in locomotor activity, meaning its apparent anxiolytic effect was inseparable from sedation.
The CB1 antagonist rimonabant blocked the anti-burying effects of both FAAH and MAGL inhibitors but not diazepam, confirming a CB1 receptor mechanism.
Key Numbers
PF-3845, JZL184, and diazepam reduced marble burying without affecting locomotion. THC reduced burying only at doses that also impaired movement. Rimonabant blocked FAAH/MAGL inhibitor effects but not diazepam.
How They Did This
Controlled animal study in mice using the marble burying assay. FAAH inhibitor PF-3845, MAGL inhibitor JZL184, diazepam, and THC tested at multiple doses. Locomotor activity measured concurrently. CB1 receptor involvement confirmed with rimonabant.
Why This Research Matters
The separation of anxiolytic effects from sedation was a key advantage of endocannabinoid-boosting drugs over direct cannabinoid agonists like THC, supporting their development as potential anxiety treatments.
The Bigger Picture
This study positioned endocannabinoid-enhancing drugs as a potentially superior anxiety treatment approach compared to direct cannabinoid agonists, avoiding sedation and other THC-related side effects.
What This Study Doesn't Tell Us
Mouse model with a single behavioral measure. Marble burying is only one model of anxiety/compulsive behavior. Translation to human anxiety disorders is uncertain.
Questions This Raises
- ?Would endocannabinoid-boosting drugs be effective for human OCD or anxiety disorders?
- ?Can the separation of anxiolytic and sedative effects be maintained at clinical doses?
Trust & Context
- Key Stat:
- Endocannabinoid boosters reduced anxiety without sedation; THC could not
- Evidence Grade:
- Well-controlled animal study with multiple comparators and receptor confirmation, but limited to one behavioral model.
- Study Age:
- Published in 2011. FAAH inhibitor clinical development for anxiety has progressed.
- Original Title:
- Inhibition of endocannabinoid catabolic enzymes elicits anxiolytic-like effects in the marble burying assay.
- Published In:
- Pharmacology, biochemistry, and behavior, 98(1), 21-7 (2011)
- Authors:
- Kinsey, Steven G(12), O'Neal, Scott T(2), Long, Jonathan Z(7), Cravatt, Benjamin F, Lichtman, Aron H
- Database ID:
- RTHC-00498
Evidence Hierarchy
Tests effects in animals (usually mice or rats), not humans.
What do these levels mean? →Frequently Asked Questions
Could endocannabinoid drugs treat anxiety without making you high?
In mice, drugs that boost the body's own endocannabinoids reduced anxiety-like behavior without sedation, unlike THC which only reduced anxiety at doses that also impaired movement.
What is marble burying?
A mouse behavioral test where rodents compulsively bury glass marbles in their bedding. It models repetitive, compulsive behaviors relevant to anxiety disorders like OCD.
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Cite This Study
https://rethinkthc.com/research/RTHC-00498APA
Kinsey, Steven G; O'Neal, Scott T; Long, Jonathan Z; Cravatt, Benjamin F; Lichtman, Aron H. (2011). Inhibition of endocannabinoid catabolic enzymes elicits anxiolytic-like effects in the marble burying assay.. Pharmacology, biochemistry, and behavior, 98(1), 21-7. https://doi.org/10.1016/j.pbb.2010.12.002
MLA
Kinsey, Steven G, et al. "Inhibition of endocannabinoid catabolic enzymes elicits anxiolytic-like effects in the marble burying assay.." Pharmacology, 2011. https://doi.org/10.1016/j.pbb.2010.12.002
RethinkTHC
RethinkTHC Research Database. "Inhibition of endocannabinoid catabolic enzymes elicits anxi..." RTHC-00498. Retrieved from https://rethinkthc.com/research/kinsey-2011-inhibition-of-endocannabinoid-catabolic
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.