Adolescent THC did not worsen schizophrenia-like symptoms in rats with prenatal immune activation
In rats with prenatal immune activation (a schizophrenia risk model), adolescent THC exposure impaired sociability but did not interact with or worsen the immune-activation-induced cognitive and sensory deficits.
Quick Facts
What This Study Found
MIA impaired working memory and sensorimotor gating but surprisingly increased sociability. THC alone impaired sociability and social memory. There were no interactions between MIA and THC, meaning THC did not trigger or aggravate schizophrenia-related symptoms in genetically vulnerable animals.
Key Numbers
MIA: impaired working memory and sensorimotor gating, increased sociability. THC: impaired sociability and social memory. No MIA x THC interactions on any measure.
How They Did This
Pregnant rats received LPS or vehicle. Offspring were exposed to mild THC during adolescence and tested in adulthood for working memory, sociability, anhedonia, sensorimotor gating, and incidental learning.
Why This Research Matters
The cannabis-psychosis debate often assumes THC acts as a trigger in vulnerable individuals. This study found no such interaction in a validated model, suggesting the relationship may be more nuanced than a simple trigger mechanism.
The Bigger Picture
If prenatal immune activation and adolescent THC do not interact, it suggests the two-hit hypothesis may require different vulnerability types, or that the relationship involves mechanisms not captured by this model.
What This Study Doesn't Tell Us
Single animal model with one vulnerability type. Mild THC dose. Rat behavioral assays are imperfect proxies for human psychosis. MIA model captures some but not all schizophrenia aspects.
Questions This Raises
- ?Would higher THC doses reveal interactions with MIA?
- ?Do other vulnerability models show different interactions with adolescent THC?
Trust & Context
- Key Stat:
- between prenatal immune activation and adolescent THC on any schizophrenia-relevant behavior measured
- Evidence Grade:
- Well-designed animal study with multiple behavioral measures, but limited translational applicability to human psychosis risk.
- Study Age:
- 2024 publication.
- Original Title:
- Lack of interactions between prenatal immune activation and Δ9-tetrahydrocannabinol exposure during adolescence in behaviours relevant to symptom dimensions of schizophrenia in rats.
- Published In:
- Progress in neuro-psychopharmacology & biological psychiatry, 129, 110889 (2024)
- Authors:
- Moreno-Fernández, Mario(2), Ucha, Marcos(3), Reis-de-Paiva, Raquel, Marcos, Alberto, Ambrosio, Emilio, Higuera-Matas, Alejandro
- Database ID:
- RTHC-05567
Evidence Hierarchy
Tests effects in animals (usually mice or rats), not humans.
What do these levels mean? →Frequently Asked Questions
Does THC trigger psychosis in vulnerable people?
This animal study found no interaction between a schizophrenia vulnerability model and adolescent THC, suggesting the relationship may be more complex than a simple trigger.
What is the MIA model?
Maternal immune activation involves triggering an immune response in pregnant animals, producing offspring with brain and behavioral changes resembling aspects of schizophrenia.
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Cite This Study
https://rethinkthc.com/research/RTHC-05567APA
Moreno-Fernández, Mario; Ucha, Marcos; Reis-de-Paiva, Raquel; Marcos, Alberto; Ambrosio, Emilio; Higuera-Matas, Alejandro. (2024). Lack of interactions between prenatal immune activation and Δ9-tetrahydrocannabinol exposure during adolescence in behaviours relevant to symptom dimensions of schizophrenia in rats.. Progress in neuro-psychopharmacology & biological psychiatry, 129, 110889. https://doi.org/10.1016/j.pnpbp.2023.110889
MLA
Moreno-Fernández, Mario, et al. "Lack of interactions between prenatal immune activation and Δ9-tetrahydrocannabinol exposure during adolescence in behaviours relevant to symptom dimensions of schizophrenia in rats.." Progress in neuro-psychopharmacology & biological psychiatry, 2024. https://doi.org/10.1016/j.pnpbp.2023.110889
RethinkTHC
RethinkTHC Research Database. "Lack of interactions between prenatal immune activation and ..." RTHC-05567. Retrieved from https://rethinkthc.com/research/moreno-fernandez-2024-lack-of-interactions-between
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.