SAN DIEGO -- Research released today underscores both the dangers and the therapeutic promise of marijuana, revealing different effects across the lifespan. Marijuana exposure in the womb or during adolescence may disrupt learning and memory, damage communication between brain regions, and disturb levels of key neurotransmitters and metabolites in the brain. In Alzheimer's disease, however, compounds found in marijuana, such as the psychoactive compound delta-9-tetrahydrocannabinol (THC), may improve memory and mitigate some of the disease's symptoms. The findings were presented at Neuroscience 2018, the annual meeting of the Society for Neuroscience and the world's largest source of emerging news about brain science and health.
Marijuana is the most commonly used illicit drug in the United States and its popularity is expected to rise as it is legalized in more places. It is also the illegal drug most commonly used by pregnant women, despite the potential for long-term harm to the fetus. Many people start using marijuana as teenagers -- a particularly vulnerable time as the brain is still developing -- when there is evidence for increased risk. At the same time, a growing number of people are turning to marijuana for the relief of symptoms of chronic diseases such as epilepsy and multiple sclerosis. These use patterns highlight the need to better understand the long-term effects of marijuana, particularly in sensitive populations such as unborn children and adolescents.
Today's new findings show that:
"Today's findings lend new understanding of the complex effects that cannabis has on the brain," said press conference moderator Michael Taffe, PhD, of Scripps Research Institute and an expert in substance abuse research. "While it may have therapeutic potential in some situations, it is important to get a better understanding of the negative aspects as well, particularly for pregnant women, teens, and chronic users."
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This research was supported by national funding agencies such as the National Institutes of Health, as well as other public, private, and philanthropic organizations worldwide. Find out more about cannabis on BrainFacts.org .
Related Neuroscience 2018 Presentation: Minisymposia: Insular Cortex Neurocircuits: Relationships Among Function, Connectivity, and Drug and Alcohol Abuse Monday, Nov. , 8:30-11 a.m., SDCC 6E