Adolescent THC caused lasting memory deficits in female rodents by disrupting synaptic plasticity and estrogen signaling
A 14-day THC course in adolescent rats and mice caused profound, sex-specific deficits in hippocampal synaptic plasticity and memory that persisted into adulthood, with females more severely affected through disrupted estrogen signaling.
Quick Facts
What This Study Found
Adolescent THC exposure produced selective, lasting deficits in synaptic plasticity in two hippocampal pathways, primarily in females. In females, THC disrupted endocannabinoid-dependent long-term potentiation, impaired estrogen effects on synaptic responses, and caused deficits in both episodic-like and spatial memory. Effects were sexually dimorphic and pathway-specific.
Key Numbers
14-day adolescent THC treatment. Effects confirmed in both rats and mice (cross-species validation). Lateral perforant path LTP disrupted in females of both species and male mice. Schaffer-commissural LTP disrupted in females only.
How They Did This
Rats and mice received 14 days of daily THC during adolescence. In adulthood, researchers measured synaptic plasticity (long-term potentiation) in hippocampal brain slices and tested episodic and spatial memory behavior.
Why This Research Matters
This study identifies a specific mechanism for sex-specific adolescent cannabis vulnerability: THC disrupts the interaction between the endocannabinoid system and estrogen signaling in the hippocampus, with lasting consequences for memory.
The Bigger Picture
The finding that adolescent THC disrupts estrogen's role in synaptic plasticity provides a mechanistic explanation for why female cannabis users may be particularly vulnerable to memory impairment, with implications for the growing number of young women using cannabis.
What This Study Doesn't Tell Us
Animal study with uncertain human translation. Single THC dose regimen. Specific hippocampal pathways may not capture all relevant cognitive effects. Estrogen interaction mechanism needs confirmation in humans.
Questions This Raises
- ?Could estrogen-related treatments reverse these effects?
- ?Do hormonal contraceptives interact with cannabis to worsen or protect against these effects?
- ?Are human females similarly more vulnerable?
Trust & Context
- Key Stat:
- Females more severely affected via disrupted estrogen-synaptic signaling
- Evidence Grade:
- Cross-species validation (rats and mice) with mechanistic depth, but animal model limitations.
- Study Age:
- Published in 2022.
- Original Title:
- Persistent sexually dimorphic effects of adolescent THC exposure on hippocampal synaptic plasticity and episodic memory in rodents.
- Published In:
- Neurobiology of disease, 162, 105565 (2022)
- Authors:
- Le, Aliza A, Quintanilla, Julian, Amani, Mohammad, Piomelli, Daniele, Lynch, Gary, Gall, Christine M
- Database ID:
- RTHC-03991
Evidence Hierarchy
Tests effects in animals (usually mice or rats), not humans.
What do these levels mean? →Frequently Asked Questions
Does teen cannabis use cause lasting brain damage?
In this animal study, 14 days of adolescent THC caused persistent deficits in hippocampal synaptic plasticity and memory that were still present in adulthood, particularly in females.
Are girls more vulnerable to cannabis brain effects?
In this rodent study, females showed more severe and widespread deficits in hippocampal function after adolescent THC, linked to disruption of estrogen's role in synaptic plasticity.
Read More on RethinkTHC
Cite This Study
https://rethinkthc.com/research/RTHC-03991APA
Le, Aliza A; Quintanilla, Julian; Amani, Mohammad; Piomelli, Daniele; Lynch, Gary; Gall, Christine M. (2022). Persistent sexually dimorphic effects of adolescent THC exposure on hippocampal synaptic plasticity and episodic memory in rodents.. Neurobiology of disease, 162, 105565. https://doi.org/10.1016/j.nbd.2021.105565
MLA
Le, Aliza A, et al. "Persistent sexually dimorphic effects of adolescent THC exposure on hippocampal synaptic plasticity and episodic memory in rodents.." Neurobiology of disease, 2022. https://doi.org/10.1016/j.nbd.2021.105565
RethinkTHC
RethinkTHC Research Database. "Persistent sexually dimorphic effects of adolescent THC expo..." RTHC-03991. Retrieved from https://rethinkthc.com/research/le-2022-persistent-sexually-dimorphic-effects
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.