Scientists have identified a neural mechanism that could explain how a psychedelic compound reduces alcohol intake. In a recent study published in JNeurosci, researchers at the University of North Carolina at Chapel Hill found that psilocin, the active metabolite of the psychedelic compound in “magic” mushrooms, also dampens activity in stress-sensitive neurons that typically drive alcohol use.
The study provides new preclinical evidence about how psychedelic compounds can alter brain activity linked to persistent behaviors like addiction.
A Closer Look at Psychedelics and Alcohol Use
Interest in psychedelic-assisted therapy for alcohol use has increased as studies point to reduced cravings and better emotional regulation. However, the biological mechanisms responsible for these effects remain poorly understood. In the human body, psilocybin is converted into psilocin, which impacts serotonin receptors in the brain. The specific neural changes that connect psilocin to alcohol consumption have remained largely unknown.
In an attempt to learn more about this connection, the UNC team, led by Sarah Magee and Melissa Herman, analyzed the central amygdala, a brain region that controls emotional processing and response to stress. Both of these factors contribute to alcohol dependence. Researchers have linked increased activity in this network to anxiety, negative emotions, and higher alcohol intake.
Herman notes that preclinical work like this is essential for understanding how psychedelic compounds exert their effects.
Why Female Mice?
The researchers selected only female mice for this trial because they typically consume more alcohol than their male counterparts. This characteristic makes them a more sensitive model for studying changes in drinking behavior and brain activity.
The team exposed the mice to long-term alcohol access and then administered psilocin to these subjects. Following the introduction of psilocin, the team monitored how neurons in the central amygdala responded to it.
Psilocin Calms Overactive Neurons Linked to Stress and Drinking
After long-term alcohol exposure, neurons in the central amygdala often become overactive. The UNC researchers found that psilocin lowered this heightened level of activity, calming the neurons connected to stress-driven drinking. The mice also drank less alcohol while under the effects of psilocin. This behavioral shift matched the changes observed in their brain activity.
Alcohol consumption eventually returned to baseline levels, indicating that the effect of psilocin is temporary. Still, this short-term reduction provides a direct biological connection between the compound and changes in behavior.
The researchers also observed a similar pattern in mice with lower levels of alcohol exposure. This finding is important because clinical studies suggest that psychedelics may help not only those with severe addiction, but also individuals experiencing a range of emotional and psychiatric challenges.
Connecting Neural Circuits to Treatment Possibilities
The study does not suggest that psilocin alone is a treatment for alcohol use disorder. Instead, it identifies a neural mechanism that may help explain the behavioral changes observed in human studies. This is particularly significant for enhancing emotional regulation and responses to stress.
The central amygdala is not only involved in addiction, but also in anxiety and depression. These are all areas where psychedelics have shown potential medical benefits. By reducing the activity of stress-sensitive neurons, psilocin may help restore brain states disrupted by psychological distress.
Herman notes that this insight aligns with both addiction science and the broader mental-health landscape. If increased activity in these neurons is tied to alcohol use disorders, reducing that activity provides a plausible biological route for why alcohol consumption decreases during psychedelic exposure.
The Road Ahead
Psilocin’s ability to quiet an overactive stress circuit offers insight into how psychedelics can influence the brain systems tied to addiction. While these early findings in mice do not capture the full complexity of alcohol use disorder in humans, they reinforce the connection between brain circuits, behavior, and possible treatment approaches.
Researchers now plan to replicate this study with male subjects, track the duration of the neural shifts, and investigate how these findings might align with existing behavioral therapies.
Austin Burgess is a writer and researcher with a background in sales, marketing, and data analytics. He holds a Master of Business Administration and a Bachelor of Science in Business Administration, as well as a certification in Data Analytics. His work combines analytical training with a focus on emerging science, aerospace, and astronomical research.