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Reserpine-induced rat model for depression: Behavioral, physiological and PET-based dopamine receptor availability

Lidia Miguel Telega1, Raissa Berti2, Ganna Blazhenets2

  • 1Lab of Stereotaxy and Interventional Neurosciences (SIN), Dept. of Stereotactic and Functional Neurosurgery, Medical Center - University Freiburg, Germany; Department of Stereotactic and Functional Neurosurgery, Medical Center - University Freiburg, Germany; Faculty of Biology, University of Freiburg, Germany; BrainLinks-BrainTools, IMBIT (Institute for Machine-Brain Interfacing Technology), Freiburg, Germany.

Progress in Neuro-Psychopharmacology & Biological Psychiatry
|April 18, 2024
PubMed

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Summary

Reserpine (RES) causes dopamine depletion and transient depression-like behaviors in rats, suggesting its potential as a chronic pharmacological model for depression research. This study validates RES as a tool for exploring antidepressant strategies.

Area of Science:

  • Neuroscience
  • Pharmacology
  • Animal Models of Disease

Background:

  • Reserpine (RES), a Vesicular Monoamine Transporter 2 (VMAT2) inhibitor, is used in preclinical research to model depression.
  • Limited evidence exists on RES's validity as a chronic depression model, with a lack of comprehensive behavioral and molecular studies.

Purpose of the Study:

  • To investigate the chronic effects of Reserpine (RES) administration on behavior and molecular outcomes in a rat model.
  • To assess the validity and potential of RES as a chronic pharmacological model for depression.

Main Methods:

  • Rats received vehicle or varying doses of RES (0.2 or 0.8 mg/kg) for 20 days, with behavioral testing before, during, and after treatment.
  • Brain mRNA expression and dopamine D2/3 receptor availability using [18F]DMFP PET scans were assessed.
Keywords:
BehaviorDopamine receptor PETReserpineRodent depression modelmRNA expression

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  • Weight and welfare were monitored throughout the study.

    • Main Results:

    • RES induced dose-dependent weight loss, hypo-locomotion, anhedonia, anxiety, and reduced exploration.
    • Dopamine D2 receptor mRNA expression decreased in the accumbal region in the low-dose RES group.
    • RES treatment significantly increased [18F]DMFP BPND, indicating striatal dopamine depletion persisting post-treatment.

    Conclusions:

    • Chronic RES administration leads to persistent striatal dopamine depletion in rats, even after a washout period.
    • Observed behavioral phenotypes were transient, suggesting RES has mild face validity as a rodent model for depression.
    • The study provides a longitudinal assessment of RES effects, supporting its use in preclinical depression research.