Experimental Neurology
April 1, 2020
Jessica Winne, Barbara C Boerner, Thawann Malfatti et al.
34 citations
Salicylate intoxication, which causes tinnitus and anxiety in humans, induces anxiety-like behavior and a specific brain oscillation called type 2 theta (theta2) in the hippocampus of young mice with normal hearing, but not in older mice. A single dose of the hallucinogenic compound 5-MeO-DMT prevents both the anxiety-like behavior and the increase in theta2 and slow gamma oscillations in the ventral hippocampus and medial prefrontal cortex after salicylate injection. These findings suggest that the anxiety triggered by salicylate depends on normal hearing and that hallucinogenic compounds may be effective for treating tinnitus-related anxiety.
Molecular Psychiatry
January 1, 2025
Margareth Nogueira, Daiane C Ferreira Golbert, Richardson Menezes et al.
18 citations
A single dose of the short-acting psychedelic 5-MeO-DMT alters expression of genes related to plasticity and neuronal activity in specific brain regions of mice, including the anterior cingulate cortex, basolateral amygdala, and ventral hippocampus. Immediate early genes Arc and Zif268 changed within hours, while TRIP8b, a modulator of neuronal activity, increased in the ventral hippocampus after five days. Behaviorally, 5-MeO-DMT produced mixed anxiety-reducing and anxiety-increasing effects in standard tests, but mice pre-treated with the compound and then exposed to acute stress showed lower corticosterone levels and strong anxiety-reducing effects. The findings suggest molecular pathways through which 5-MeO-DMT may produce anxiolytic effects.
Scientific Reports
May 17, 2024
Annie C. Souza, Bryan C. Souza, Arthur França et al.
7 citations
The psychedelic 5-MeO-DMT alters brain activity in rats by increasing delta waves and decreasing theta waves in the hippocampus, changes that are not explained by movement. It also reduces slow and mid gamma power and disrupts theta phase modulation. The overall brain state resembles patterns seen during slow-wave sleep and REM sleep, suggesting that the drug's effects involve mixing waking behavior with sleep-like neural oscillations.
Research Square
December 28, 2023
Margareth Nogueira, Daiane C Ferreira Golbert, Richardson Menezes et al.
2 citations
A single high dose of the short-acting psychedelic 5-MeO-DMT alters gene expression in specific brain regions of mice, including the anterior cingulate cortex, basolateral amygdala, ventral hippocampus CA1 region, and dentate gyrus. The compound changed mRNA levels of immediate early genes Arc and Zif268 in several regions and increased TRIP8b expression in the ventral hippocampus after five days. Behaviorally, treated mice showed mixed anxiety-reducing and anxiety-increasing effects in standard tests. However, when pre-treated mice were subjected to acute stress, they had lower corticosterone levels and robust anxiety-reducing effects. These findings suggest molecular actions of 5-MeO-DMT related to its potential anxiolytic effects.
Scientific Reports
July 14, 2024
Annie C. Souza, Bryan C. Souza, Arthur França et al.
1 citation
No Summary
Psychedelics
January 25, 2024
Katarina E. Leão
1 citation
No Summary
bioRxiv (Cold Spring Harbor Laboratory)
June 5, 2023
Annie Da Costa Souza, Bryan Da Costa Souza, Arthur França et al.
preprint
The psychedelic 5-MeO-DMT increases delta power and decreases theta power in the hippocampus of freely moving rats, effects not explained by changes in locomotion. It also dose-dependently reduces slow and mid gamma power and theta phase modulation. The overall spectral profile of awake behavior after 5-MeO-DMT resembles electrophysiological states seen during slow-wave sleep and REM sleep. These findings suggest that classical psychedelics may integrate waking behaviors with sleep-like neural activity patterns.