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Classification of psychedelics and psychoactive drugs based on brain-wide imaging of cellular c-Fos expression

Author

Listed:
  • Farid Aboharb

    (Cornell University
    Weill Cornell Medicine/Rockefeller/Sloan-Kettering Tri-Institutional MD/PhD Program)

  • Pasha A. Davoudian

    (Cornell University
    Yale University School of Medicine
    Yale University School of Medicine)

  • Ling-Xiao Shao

    (Cornell University
    Yale University School of Medicine)

  • Clara Liao

    (Cornell University
    Yale University School of Medicine)

  • Gillian N. Rzepka

    (Cornell University)

  • Cassandra Wojtasiewicz

    (Cornell University)

  • Jonathan Indajang

    (Cornell University)

  • Mark Dibbs

    (Yale University School of Medicine)

  • Jocelyne Rondeau

    (Yale University School of Medicine)

  • Alexander M. Sherwood

    (Usona Institute)

  • Alfred P. Kaye

    (Yale University School of Medicine
    VA National Center for PTSD
    Yale University)

  • Alex C. Kwan

    (Cornell University
    Yale University School of Medicine
    Weill Cornell Medicine)

Abstract

Psilocybin, ketamine, and MDMA are psychoactive compounds that exert behavioral effects with distinguishable but also overlapping features. The growing interest in using these compounds as therapeutics necessitates preclinical assays that can accurately screen psychedelics and related analogs. We posit that a promising approach may be to measure drug action on markers of neural plasticity in native brain tissues. We therefore developed a pipeline for drug classification using light sheet fluorescence microscopy of immediate early gene expression at cellular resolution followed by machine learning. We tested male and female mice with a panel of drugs, including psilocybin, ketamine, 5-MeO-DMT, 6-fluoro-DET, MDMA, acute fluoxetine, chronic fluoxetine, and vehicle. In one-versus-rest classification, the exact drug was identified with 67% accuracy, significantly above the chance level of 12.5%. In one-versus-one classifications, psilocybin was discriminated from 5-MeO-DMT, ketamine, MDMA, or acute fluoxetine with >95% accuracy. We used Shapley additive explanation to pinpoint the brain regions driving the machine learning predictions. Our results suggest a unique approach for characterizing and validating psychoactive drugs with psychedelic properties.

Suggested Citation

  • Farid Aboharb & Pasha A. Davoudian & Ling-Xiao Shao & Clara Liao & Gillian N. Rzepka & Cassandra Wojtasiewicz & Jonathan Indajang & Mark Dibbs & Jocelyne Rondeau & Alexander M. Sherwood & Alfred P. Ka, 2025. "Classification of psychedelics and psychoactive drugs based on brain-wide imaging of cellular c-Fos expression," Nature Communications, Nature, vol. 16(1), pages 1-15, December.
  • Handle: RePEc:nat:natcom:v:16:y:2025:i:1:d:10.1038_s41467-025-56850-6
    DOI: 10.1038/s41467-025-56850-6
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    References listed on IDEAS

    as
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