Overexpressing a cannabinoid receptor protein in rat brains produced schizophrenia-like symptoms
Overexpressing CNRIP1, a protein that regulates the CB1 cannabinoid receptor, in the ventral hippocampus of rats produced behavioral and neurological changes resembling schizophrenia.
Quick Facts
What This Study Found
Viral-mediated overexpression of CNRIP1 in the ventral hippocampus caused impairments in latent inhibition and social interaction (behavioral correlates of schizophrenia) and increased dopamine neuron population activity in the ventral tegmental area, a putative marker of psychosis.
Key Numbers
CNRIP1 overexpression impaired latent inhibition and social interaction. VTA dopamine neuron population activity was significantly increased.
How They Did This
Sprague Dawley rats received viral-mediated CNRIP1 overexpression in the ventral hippocampus. They were tested for latent inhibition, social interaction, and VTA dopamine neuron activity via electrophysiology.
Why This Research Matters
Previous studies found abnormal CNRIP1 DNA methylation in postmortem brains of people with schizophrenia. This study shows that simply overexpressing this cannabinoid-regulating protein is enough to produce schizophrenia-like changes in rats.
The Bigger Picture
This adds a new piece to the cannabis-psychosis puzzle. Rather than focusing on THC or the CB1 receptor itself, this research points to a regulatory protein in the cannabinoid system as a potential contributor to schizophrenia pathology.
What This Study Doesn't Tell Us
Animal model; behavioral correlates in rats are imperfect proxies for human schizophrenia symptoms. Only one brain region (ventral hippocampus) was targeted.
Questions This Raises
- ?Do people with schizophrenia have elevated CNRIP1 levels in the hippocampus?
- ?Could CNRIP1 serve as a biomarker or drug target for psychosis?
- ?Does adolescent cannabis use alter CNRIP1 expression?
Trust & Context
- Key Stat:
- CNRIP1 overexpression alone was sufficient to produce psychosis-like changes
- Evidence Grade:
- Preliminary: single animal study using viral overexpression in one brain region.
- Study Age:
- Published in 2019.
- Original Title:
- Ventral hippocampal overexpression of Cannabinoid Receptor Interacting Protein 1 (CNRIP1) produces a schizophrenia-like phenotype in the rat.
- Published In:
- Schizophrenia research, 206, 263-270 (2019)
- Authors:
- Perez, Stephanie M, Donegan, Jennifer J, Boley, Angela M, Aguilar, David D, Giuffrida, Andrea, Lodge, Daniel J
- Database ID:
- RTHC-02224
Evidence Hierarchy
Tests effects in animals (usually mice or rats), not humans.
What do these levels mean? →Frequently Asked Questions
What is CNRIP1?
Cannabinoid Receptor Interacting Protein 1 is an intracellular protein that regulates the activity of the CB1 cannabinoid receptor. Abnormal levels have been found in postmortem brains of people with schizophrenia.
How does this relate to cannabis use and psychosis?
The study suggests that disruptions to the cannabinoid system beyond just receptor activation can contribute to psychosis-like states. Cannabis use could potentially alter CNRIP1 expression, though this was not directly tested.
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Cite This Study
https://rethinkthc.com/research/RTHC-02224APA
Perez, Stephanie M; Donegan, Jennifer J; Boley, Angela M; Aguilar, David D; Giuffrida, Andrea; Lodge, Daniel J. (2019). Ventral hippocampal overexpression of Cannabinoid Receptor Interacting Protein 1 (CNRIP1) produces a schizophrenia-like phenotype in the rat.. Schizophrenia research, 206, 263-270. https://doi.org/10.1016/j.schres.2018.11.006
MLA
Perez, Stephanie M, et al. "Ventral hippocampal overexpression of Cannabinoid Receptor Interacting Protein 1 (CNRIP1) produces a schizophrenia-like phenotype in the rat.." Schizophrenia research, 2019. https://doi.org/10.1016/j.schres.2018.11.006
RethinkTHC
RethinkTHC Research Database. "Ventral hippocampal overexpression of Cannabinoid Receptor I..." RTHC-02224. Retrieved from https://rethinkthc.com/research/perez-2019-ventral-hippocampal-overexpression-of
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.