Health · Mental Health · 12 hrs ago
Study links cannabis-related anxiety in mice to central amygdala neurons
Researchers at Northwestern University studied how a synthetic cannabinoid affects mice facing a scent derived from fox urine.
The mice given the drug froze more and spent less time near the scent than mice given a placebo.
The drug is in the same class of substances as THC, the main psychoactive ingredient in cannabis.
Brain recordings linked the stronger fear response to somatostatin neurons in the central amygdala, a region involved in fear and stress.
The researchers found that the drug weakened signals that normally restrain these neurons, while silencing them reduced the mice’s avoidance of the scent.
The findings may help explain why cannabis can intensify anxiety when a person is stressed or in a threatening situation.
The experiments used mice and a synthetic drug, so researchers still need to test whether the same brain mechanism operates in people.
The researchers say this pathway could also offer a possible target for treating anxiety, but that has not been established.
A study in mice linked cannabinoid-related anxiety-like behavior under threat to somatostatin neurons in the central amygdala.
Mice given a synthetic cannabinoid froze more and spent less time near a predator odor than mice given a placebo.
Brain recordings showed greater activity in the neurons, with activity increasing at higher doses.
Silencing the neurons reduced the drug-treated mice’s avoidance of the odor.
Researchers said it remains unknown whether the same pathway operates in people.
- Who
- Northwestern University researchers, including senior author Sachin Patel.
- What
- The study linked somatostatin neurons in the central amygdala to anxiety-like behavior in cannabinoid-treated mice exposed to a threatening odor.
- When
- The study was published October 2, 2026.
- Where
- In mice, in laboratory experiments; the researchers were at Northwestern University.
- Why
- Researchers investigated how cannabinoids may heighten anxiety when surroundings are threatening.
This story does not have two clearly opposing sides.
Higher doses of cannabinoids and environmental stress worked together to synergistically release the ‘brake’ on the central amygdala, which in turn drove excessive anxiety.
The results of this study could explain why a good trip can turn bad pretty quickly if people consume too much cannabis or the situation they are in turns stressful or scary.
Understanding how cannabis affects brain function to generate its psychoactive effects could ultimately reveal new ways to counteract negative consequences should they arise in some people.
Suppressing the activity of somatostatin neurons in the central amygdala could represent a final pathway for reducing anxiety symptoms, not just in the context of cannabis side effects.
Researchers already knew that cannabinoids strongly affect the central amygdala, which helps regulate anxiety, stress responses and emotional behavior.
Researchers gave mice a synthetic cannabinoid and exposed them to a predator odor; treated mice froze more and spent less time near the odor than placebo-treated mice.
Brain recordings showed increased activity in central amygdala somatostatin neurons, with higher doses linked to more activity.
Silencing the neurons reduced the cannabinoid-treated mice’s avoidance of the predator odor.
The study was published in Nature Communications.
- Study animals
- Mice
- Drug used
- Synthetic cannabinoid CP 55,940
- Brain region
- Central amygdala
- Neurons studied
- Somatostatin neurons
- Threat stimulus
- Synthetic predator odor similar to a compound found in fox poop
- Journal
- Nature Communications
Sources
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