Prenatal exposure to CBD and THC is linked to concerning brain changes (Jul 2024, rats) Prenatal tetrahydrocannabinol and cannabidiol exposure produce sex-specific pathophysiological phenotypes in the adolescent prefrontal cortex and hippocampus Study 

Michael Harrop

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https://www.psypost.org/prenatal-exposure-to-cbd-and-thc-is-linked-to-concerning-brain-changes/

As the legal and social acceptance of cannabis continues to grow, so does its use among pregnant women. Many expectant mothers turn to cannabis to alleviate pregnancy-related symptoms, believing it to be a natural and safe remedy. However, a recent study published in the journal Neurobiology of Disease suggests that prenatal exposure to cannabis, particularly its primary components Δ9-tetrahydrocannabinol (THC) and cannabidiol (CBD), can have significant long-term effects on brain development and behavior in rodents.

The study found that prenatal exposure to THC, CBD, or a combination of both can lead to reduced birth size, behavioral changes during adolescence, and disrupted neuronal activity in key brain regions. These findings provide insights into how cannabis constituents impact fetal brain development and highlight potential risks associated with prenatal cannabis use.

Previous studies have linked prenatal cannabis exposure to low birth weight, cognitive deficits, and a higher risk of neuropsychiatric disorders. However, there is a lack of detailed understanding of the specific neuronal and molecular mechanisms underlying these effects and how different cannabis constituents might contribute to these outcomes.

https://www.sciencedirect.com/science/article/pii/S0969996124001888

Highlights​

  • Gestational treatment with THC, CBD and THC + CBD reduced offspring birth size.
  • Prenatal THC, CBD and THC + CBD induced distinct sex-specific adolescent behavioural phenotypes.
  • PFC-vHIPP neuronal activity was disrupted by prenatal cannabinoid exposure.
  • Associated with endocannabinoid, GABA and glutamatergic system mRNA alterations.
  • Excitatory/inhibitory signalling imbalance in PFC-vHIPP network may underly effects.

Abstract​

Clinical and preclinical evidence has demonstrated an increased risk for neuropsychiatric disorders following prenatal cannabinoid exposure. However, given the phytochemical complexity of cannabis, there is a need to understand how specific components of cannabis may contribute to these neurodevelopmental risks later in life.

To investigate this, a rat model of prenatal cannabinoid exposure was utilized to examine the impacts of specific cannabis constituents (Δ9-tetrahydrocannabinol [THC]; cannabidiol [CBD]) alone and in combination on future neuropsychiatric liability in male and female offspring.

Prenatal THC and CBD exposure were associated with low birth weight. At adolescence, offspring displayed sex-specific behavioural changes in anxiety, temporal order and social cognition, and sensorimotor gating. These phenotypes were associated with sex and treatment-specific neuronal and gene transcriptional alterations in the prefrontal cortex, and ventral hippocampus, regions where the endocannabinoid system is implicated in affective and cognitive development. Electrophysiology and RT-qPCR analysis in these regions implicated dysregulation of the endocannabinoid system and balance of excitatory and inhibitory signalling in the developmental consequences of prenatal cannabinoids.

These findings reveal critical insights into how specific cannabinoids can differentially impact the developing fetal brains of males and females to enhance subsequent neuropsychiatric risk.

Graphical abstract​

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