A Brain Chemical Linked to Schizophrenia Made THC's Impairing Effects Worse in Mice
The metabolite kynurenine amplified THC-induced sensorimotor impairment and classic behavioral effects in mice, possibly by increasing THC blood levels.
Quick Facts
What This Study Found
Mice given kynurenine before THC showed significantly worse sensorimotor responses, greater motor impairment, and deeper hypothermia compared to THC alone. Kynurenine also increased blood levels of THC and its psychoactive metabolite 11-OH-THC.
Key Numbers
Brain kynurenic acid levels significantly increased 1 hour after kynurenine administration; THC and 11-OH-THC plasma levels were higher in kynurenine-pretreated mice; kynurenine amplified THC effects on motor tests (bar test, drag test, rotarod) and hypothermia but not pain response
How They Did This
Adult male mice received THC (30 mg/kg) and kynurenine (20 mg/kg) alone or combined. Researchers measured body temperature, pain responses, motor activity, sensorimotor function, brain kynurenic acid levels, and plasma THC concentrations.
Why This Research Matters
The kynurenine pathway is dysregulated in schizophrenia, and THC can worsen psychotic symptoms. This study suggests a biological mechanism linking the two: elevated kynurenine may amplify THC's effects, potentially explaining why people with schizophrenia are especially vulnerable to cannabis-related harm.
The Bigger Picture
Understanding why some people are more vulnerable to THC's negative effects is a major research priority. This study points to the kynurenine pathway as one biological factor that could amplify THC-related impairment, with particular relevance for people with schizophrenia.
What This Study Doesn't Tell Us
Male mice only, high THC dose (30 mg/kg), kynurenine-THC interaction may be partly pharmacokinetic rather than pharmacodynamic, cannot confirm mechanism applies to humans
Questions This Raises
- ?Do people with elevated kynurenine levels experience stronger THC effects?
- ?Could kynurenine pathway activity predict individual vulnerability to cannabis-induced psychosis?
- ?Would lower THC doses show the same interaction?
Trust & Context
- Key Stat:
- Kynurenine pretreatment increased both THC blood levels and its behavioral effects in mice
- Evidence Grade:
- Single animal study with male mice only; first to demonstrate kynurenine-THC interaction on sensorimotor function
- Study Age:
- Published 2025
- Original Title:
- Kynurenine amplifies tetrahydrocannabinol-induced sensorimotor impairment and classic "tetrad" effects in mice.
- Published In:
- Progress in neuro-psychopharmacology & biological psychiatry, 138, 111342 (2025)
- Authors:
- Bilel, Sabrine(5), Corli, Giorgia(3), Tiziani, Edoardo, Chirenti, Daniele, Dall'Acqua, Stefano, Comai, Stefano, Ferraro, Luca, Marti, Matteo, Beggiato, Sarah
- Database ID:
- RTHC-06064
Evidence Hierarchy
Tests effects in animals (usually mice or rats), not humans.
What do these levels mean? →Frequently Asked Questions
What is kynurenine and why does it matter for cannabis?
Kynurenine is a metabolite in a brain chemical pathway that's overactive in schizophrenia. This study found it amplified THC's impairing effects in mice, suggesting a biological reason why some people may be more vulnerable to cannabis.
Did kynurenine change how THC is processed in the body?
Yes. Mice pretreated with kynurenine had higher blood levels of both THC and its psychoactive metabolite 11-OH-THC, suggesting the interaction may be partly about how the body processes THC.
Read More on RethinkTHC
- THC-purity-potency-label-meaning
- dab-concentrate-addiction-withdrawal
- delta-8-addiction-withdrawal
- edible-addiction-withdrawal-different
- edibles-psychosis-emergency-room
- healthiest-way-to-consume-cannabis
- how-cannabis-products-made-concentrates-edibles
- laced-weed-fentanyl-contaminated-vape
- legal-weed-vs-street-weed-quality-safety
- quitting-dabs-withdrawal
- quitting-edibles-withdrawal
- sativa-vs-indica-difference-myth
- weed-potency-withdrawal
Cite This Study
https://rethinkthc.com/research/RTHC-06064APA
Bilel, Sabrine; Corli, Giorgia; Tiziani, Edoardo; Chirenti, Daniele; Dall'Acqua, Stefano; Comai, Stefano; Ferraro, Luca; Marti, Matteo; Beggiato, Sarah. (2025). Kynurenine amplifies tetrahydrocannabinol-induced sensorimotor impairment and classic "tetrad" effects in mice.. Progress in neuro-psychopharmacology & biological psychiatry, 138, 111342. https://doi.org/10.1016/j.pnpbp.2025.111342
MLA
Bilel, Sabrine, et al. "Kynurenine amplifies tetrahydrocannabinol-induced sensorimotor impairment and classic "tetrad" effects in mice.." Progress in neuro-psychopharmacology & biological psychiatry, 2025. https://doi.org/10.1016/j.pnpbp.2025.111342
RethinkTHC
RethinkTHC Research Database. "Kynurenine amplifies tetrahydrocannabinol-induced sensorimot..." RTHC-06064. Retrieved from https://rethinkthc.com/research/bilel-2025-kynurenine-amplifies-tetrahydrocannabinolinduced-sensorimotor
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.