Biological psychiatryMar 1, 2026

Psychedelics and the Brain’s Support Network: Changing Brain Flexibility for New Psychiatric Treatments

Psychedelic Science Weekly Brief ↗PubMed ↗DOI ↗

Updated Mar 2, 2026

Abstract

Classic psychedelics may activate serotonin receptors and key signaling pathways, leading to structural brain changes.

Psychedelics like psilocybin, LSD, and DMT are associated with increased neuroplasticity and metaplasticity in the adult brain.
These compounds induce synaptogenesis and dendritic spine remodeling by activating serotonin receptors and downstream signaling pathways.
The brain's extracellular matrix, especially perineuronal nets, plays a crucial role in synaptic stability and is targeted by psychedelics.
Psychedelics temporarily disrupt the integrity of the extracellular matrix, which may reopen critical periods of brain plasticity.
These effects on the extracellular matrix might contribute to the lasting therapeutic benefits observed in psychedelic-assisted treatments for conditions like depression and PTSD.

Simplified

Classic psychedelics such as psilocybin, lysergic acid diethylamide (LSD), and N,N-dimethyltryptamine (DMT) have emerged as potent modulators of neuroplasticity and metaplasticity in the adult brain, offering novel therapeutic strategies for neuropsychiatric disorders. Recent findings reveal that beyond their transient psychotropic effects, these compounds activate serotonin 5-HTreceptors and downstream signaling cascades-including CaMKII, ERK, mTOR, and brain-derived neurotrophic factor (BDNF) pathways-thereby inducing synaptogenesis, dendritic spine remodeling, and transcription of immediate early genes. Critically, the brain's extracellular matrix (ECM), particularly perineuronal nets (PNNs), has been identified as a central regulator of synaptic stability and a key target of psychedelic action. Psychedelics transiently disrupt ECM integrity by loosening PNNs and reorganizing pericellular scaffolds, a process that reopens developmentally restricted critical periods of plasticity and restores circuit-level flexibility. These ECM-mediated metaplastic effects appear essential to the sustained therapeutic outcomes observed in clinical studies of psychedelic-assisted therapy for depression, post-traumatic stress disorder (PTSD), addiction, and potentially neurodegenerative diseases. This manuscript synthesizes current cellular, molecular, and translational evidence highlighting the ECM as a dynamic and permissive substrate through which classic psychedelics exert long-lasting structural and functional brain changes, underscoring its potential as a target for precision interventions in neuropsychiatric care. 2A

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Psychedelics and the Brain’s Support Network: Changing Brain Flexibility for New Psychiatric Treatments

Abstract

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