Ayahuasca modulation of traumatic-like fear memories requires infralimbic cortex BDNF-dependent mechanisms in rats.
Isabel Werle, Francisco S Guimarães, Rafael G. Dos Santos, Jaime E. C. Hallak, Leandro J Bertoglio
European Neuropsychopharmacology February 1, 2026 DOI: 10.1016/j.euroneuro.2025.11.009 (opens in new tab)
Study at a glance
AI-extracted from the abstract| Characteristics | Experimental study Peer reviewed |
|---|---|
| Population | Adult male and female rats |
| Intervention | Ayahuasca (AYA) |
| Dose | 0.3 mg/kg of DMT |
| Duration | Two extinction sessions on consecutive days |
| Topics | Microdosing Neuroplasticity Serotonin Ayahuasca |
| Keywords | Behavioral flexibility Threat conditioning |
| Key findings | Ayahuasca enhances fear extinction and reduces generalized fear in rats through BDNF-TrkB signaling in the infralimbic cortex. |
Abstract
Rodent studies have shown that psychedelic drugs can enhance fear extinction. However, investigations to date have relied on normative aversive conditioning procedures, which limit their relevance to trauma-related memories, as these tend to be overgeneralized and resistant to extinction. Fear extinction depends on activity and plasticity within the infralimbic (IL) region of the medial prefrontal cortex and is regulated by brain-derived neurotrophic factor (BDNF). Ayahuasca (AYA), a brew containing the serotonergic psychedelic N,N-dimethyltryptamine (DMT), facilitates fear extinction in rodents and increases BDNF levels/signaling. Here, we investigated whether AYA attenuates extinction deficits and generalized fear induced by preconditioning restraint stress or high-intensity contextual fear conditioning, and whether these effects depend on BDNF-TrkB receptor signaling in the IL cortex. Adult male and female rats underwent the protocols above and received oral AYA one hour before each of the two extinction sessions conducted on consecutive days. Repeated administration of AYA containing 0.3 mg/kg of DMT enhanced extinction learning and its retention, effects that were abolished by bilateral intra-IL cortex infusion of an anti-BDNF antibody or the TrkB receptor antagonist ANA-12. AYA treatment also reduced fear generalization, an action that was BDNF-dependent in the IL cortex of females but not males. Overall, these findings indicate that AYA can modulate maladaptive fear memories through cortical mechanisms involving BDNF signaling, highlighting the potential of psychedelics as enhancers for extinguishing difficult-to-treat memories like those underlying post-traumatic stress disorder.
Comparable studies
Other preclinical and animal studies on ayahuasca, most cited first.
Citations in the library
Cited by 3
- Preclinical Comparison of DMT and 5-MeO-DMT Reveals Behavioral Dissociation, Distinct TrkB Activation and Differential Plasticity Profiles bioRxiv (Cold Spring Harbor Laboratory) August 12, 2026
- Ayahuasca Impairs Fear Memory Reconsolidation and Promotes Rapid Structural Plasticity in the Hippocampus and Prelimbic Cortex. Molecular Neurobiology October 12, 2026
- Where is the sweet spot for psychedelic-enhanced fear extinction? An integrative quantitative synthesis of dose-effect patterns in rodent models. Journal of Psychopharmacology August 3, 2026
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