THC and CBD had different effects on brain growth factor in the adolescent hippocampus
In animal models, adolescent THC and CBD exposure had distinct effects on brain-derived neurotrophic factor (BDNF) and its receptor TrkB in the hippocampus, a region critical for learning and memory.
Quick Facts
What This Study Found
THC and CBD produced different patterns of BDNF and TrkB expression changes in the adolescent hippocampus. These findings suggest the two major cannabinoids may have opposing or distinct effects on neurodevelopmental signaling during a critical growth period.
Key Numbers
THC and CBD produced distinct patterns of BDNF and TrkB expression in the adolescent hippocampus. Effects differed between the two cannabinoids.
How They Did This
Animal study examining the effects of adolescent THC and CBD exposure on BDNF and TrkB receptor expression in the hippocampus using molecular biology techniques.
Why This Research Matters
BDNF is essential for synaptic plasticity, learning, and memory. If cannabis compounds alter BDNF signaling during adolescent brain development, it could help explain the cognitive effects reported in teen cannabis users.
The Bigger Picture
Adolescent brain development involves massive synaptic remodeling guided by neurotrophic factors like BDNF. Disrupting these signals with exogenous cannabinoids during this window could have lasting consequences for cognitive function.
What This Study Doesn't Tell Us
Animal study with unknown human translational relevance. Doses and timing may not reflect human adolescent cannabis use patterns. Molecular expression changes may not directly translate to functional cognitive effects. Single brain region examined.
Questions This Raises
- ?Do the opposing BDNF effects of THC and CBD explain why CBD may be neuroprotective while THC may be harmful during adolescence?
- ?Would combined THC+CBD exposure produce different BDNF changes than either alone?
Trust & Context
- Key Stat:
- THC and CBD produced distinct BDNF expression patterns in adolescent brain
- Evidence Grade:
- Animal study providing mechanistic insight. Cannot be directly applied to human adolescent brain development.
- Study Age:
- Published 2023.
- Original Title:
- Effects of Tetrahydrocannabinol and Cannabidiol on Brain-Derived Neurotrophic Factor and Tropomyosin Receptor Kinase B Expression in the Adolescent Hippocampus.
- Published In:
- Cannabis and cannabinoid research, 8(4), 612-622 (2023)
- Database ID:
- RTHC-05030
Evidence Hierarchy
Frequently Asked Questions
How does cannabis affect the developing teenage brain?
This animal study found THC and CBD changed levels of BDNF, a protein critical for brain cell growth and connections, in the adolescent hippocampus. The two cannabinoids had different effects, suggesting they may impact brain development differently. Whether these molecular changes translate to cognitive effects in human teens is unknown.
What is BDNF and why does it matter?
Brain-derived neurotrophic factor (BDNF) supports neuron survival, growth, and the formation of new connections. It is especially important during adolescence when the brain undergoes major remodeling. Changes in BDNF levels could affect learning, memory, and emotional regulation.
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Cite This Study
https://rethinkthc.com/research/RTHC-05030APA
Winstone, Joanna; Shafique, Hana; Clemmer, Madeleine E; Mackie, Ken; Wager-Miller, Jim. (2023). Effects of Tetrahydrocannabinol and Cannabidiol on Brain-Derived Neurotrophic Factor and Tropomyosin Receptor Kinase B Expression in the Adolescent Hippocampus.. Cannabis and cannabinoid research, 8(4), 612-622. https://doi.org/10.1089/can.2021.0025
MLA
Winstone, Joanna, et al. "Effects of Tetrahydrocannabinol and Cannabidiol on Brain-Derived Neurotrophic Factor and Tropomyosin Receptor Kinase B Expression in the Adolescent Hippocampus.." Cannabis and cannabinoid research, 2023. https://doi.org/10.1089/can.2021.0025
RethinkTHC
RethinkTHC Research Database. "Effects of Tetrahydrocannabinol and Cannabidiol on Brain-Der..." RTHC-05030. Retrieved from https://rethinkthc.com/research/winstone-2023-effects-of-tetrahydrocannabinol-and
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.