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Life sciences · Journal article
European Journal of Pharmacology · August 1, 2026
Early or partial results. Treat as a signal, not a conclusion.
This is an exploratory mechanistic study using adolescent female pigs to characterize miRNA expression changes in brain tissue following a single psilocybin dose, with the primary contribution being methodological validation of a cross-species miRNA quantification pipeline rather than establishing biological mechanism. The authors explicitly disavow causality and mechanistic conclusions, limiting interpretability for clinical translation.
Exploratory uncontrolled animal study. Adolescent female pigs. Intervention: Single dose of psilocybin.
12 dysregulated miRNAs identified in prefrontal cortex 1 day after psilocybin; 2 in hippocampus at same timepoint 4 dysregulated miRNAs detected in hippocampus 7 days post-psilocybin 9 of 18 miRNAs across both regions previously linked to depression-related phenotypes
Safety was not reported in the material analysed. Check the source before drawing any conclusion about harm.
This methodological study does not directly inform clinical practice. Results may support future mechanistic research into psilocybin's effects in mammals, but the authors explicitly note that causality and antidepressant mechanism remain unestablished.
This is an exploratory, uncontrolled mechanistic study in animal tissue establishing a methodological pipeline; the authors explicitly state it does not establish causality or direct antidepressant mechanisms.
As stated by the source record.
Quoted from the source exactly as published.
This methodological study does not directly inform clinical practice. Results may support future mechanistic research into psilocybin's effects in mammals, but the authors explicitly note that causality and antidepressant mechanism remain unestablished.
Graded across the dimensions that decide whether you should act, each from what the source actually supports. There is no single score, and where a dimension was not assessed it says so.
Novel treatment strategies are needed to address treatment resistance and delayed onset of action in psychiatry. Psilocybin has shown promise as a treatment for major depressive disorder, but the molecular changes associated with its effects remain incompletely understood. In parallel, microRNAs (miRNAs) have been implicated in depression and in responses to antidepressant interventions. Here, adolescent female pigs were used to explore miRNA expression profiles in the prefrontal cortex (PFC) and hippocampus (HIP) 1 day and 7 days after a single dose of psilocybin. We established a conservative NanoString nCounter workflow for pig tissue using the Human v3b miRNA Assay panel, cross-species reannotation based on complete human-pig sequence conservation, and evaluation of multiple normalization strategies. Using this pipeline, 12 dysregulated miRNAs were identified in the PFC and two in the HIP 1 day after psilocybin administration, whereas four dysregulated miRNAs were detected in the HIP after 7 days. Nine of the 18 miRNAs identified across the two regions have previously been linked to depression-related phenotypes. miR-212-3p and miR-107 showed the most robust acute regulation in the PFC across all four normalization approaches. These findings indicate that psilocybin administration is associated with region- and time-dependent miRNA changes in the pig brain and support the utility of this conservative nCounter pipeline for cross-species miRNA profiling. The study is exploratory and does not establish causality or direct antidepressant mechanisms.
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