Rat offspring exposed to THC in utero showed impaired emotional memory, decreased neuropeptide Y neurons in limbic regions, and increased alcohol drinking and relapse behavior during adolescence.
Prenatal health researchers, people interested in cannabis use during pregnancy
THC-exposed offspring showed both impaired emotional memory and increased alcohol-seeking behavior
What the researchers found
In utero THC-exposed adolescent rats showed impaired aversive limbic memory (but intact neutral memory), decreased NPY-positive neurons in limbic regions, altered Homer protein expression, and increased alcohol consumption, relapse, and compulsive-like drinking behavior in operant chambers.
Why it matters
As cannabis use during pregnancy increases alongside legalization, understanding potential long-term effects on offspring brain development and vulnerability to addiction is a growing public health concern.
The numbers in context
THC dose: 2 mg/kg subcutaneous to pregnant dams. Offspring showed decreased NPY-positive neurons and region-specific Homer protein changes. Increased alcohol drinking, relapse, and conflict behavior were observed in operant chamber testing.
How the study worked
Pregnant rats received subcutaneous THC (2 mg/kg) during gestation. Adolescent male offspring were assessed in two cohorts: one for behavioral reactivity, memory, and neurobiological markers (NPY, Homer proteins); another for instrumental learning and alcohol self-administration through early adulthood.
What this study cannot tell us
Animal model with subcutaneous THC administration, which differs from human cannabis use routes and patterns; only male offspring studied; single THC dose level.
How to read the evidence
Single animal study with one dose level and only male offspring examined.
When this study was published
Published in 2020.
The bigger picture
This study links prenatal THC exposure to both cognitive and addiction-related outcomes in offspring, suggesting the endocannabinoid system disruption during fetal development may have cascading effects.
Questions still open
- Would female offspring show similar vulnerabilities? Do these findings translate to the doses and routes typical of human prenatal cannabis exposure?
Common questions
Did prenatal THC affect all types of memory in the offspring?
Does this prove prenatal cannabis use causes alcohol problems in children?
Read the original research
In utero Δ9-tetrahydrocannabinol exposure confers vulnerability towards cognitive impairments and alcohol drinking in the adolescent offspring: Is there a role for neuropeptide Y?
Journal of psychopharmacology (Oxford, England), 34(6), 663-679
Citation
Brancato, Anna; Castelli, Valentina; Lavanco, Gianluca; Marino, Rosa Anna Maria; Cannizzaro, Carla. (2020). In utero Δ9-tetrahydrocannabinol exposure confers vulnerability towards cognitive impairments and alcohol drinking in the adolescent offspring: Is there a role for neuropeptide Y?. Journal of psychopharmacology (Oxford, England), 34(6), 663-679. https://doi.org/10.1177/0269881120916135
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