Cited by 69Neurogenesis and neuroplasticity mechanismsStress Responses and CortisolTreatment of Major Depression

Imipramine protects against the deleterious effects of chronic corticosterone on depression-like behavior, hippocampal reelin expression, and neuronal maturation

Fenton, Erin Y., Fournier, Neil M., Lussier, April L., Romay-Tallon, Raquel, Caruncho, Hector J., Kalynchuk, Lisa E.·2015·Progress in Neuro-Psychopharmacology and Biological Psychiatry

Abstract

We have hypothesized that a downregulation of reelin and deficient maturation of adult-born hippocampal neurons are important factors in the pathogenesis of depression. This hypothesis is based on previous work showing that depression-like behavior in rats treated with protracted corticosterone develops in concert with decreased dendritic complexity in newborn hippocampal granule neurons and decreased reelin expression in the proliferative subgranular zone of the dentate gyrus. In addition, heterozygous reeler mice with approximately 50% of normal brain levels of reelin are more vulnerable to the depressogenic effects of corticosterone than wild-type mice. The purpose of this experiment was to provide pharmacological validation for the link between reelin, neuronal maturation, and depression by examining whether the deleterious effects of corticosterone on these measures could be prevented by co-administration of the antidepressant imipramine. Rats received corticosterone injections, corticosterone injections plus either 10 or 15mg/kg imipramine injections, or vehicle injections for 21 consecutive days. They were then subjected to the forced swim test to assess depression-like behavior and sacrificed for immunohistochemical examination of immature neuron number and dendritic complexity and the presence of reelin+cells. We found that corticosterone increases depression-like behavior, decreases the number of reelin+cells in the subgranular zone, and decreases the number and complexity of immature neurons in the granule cell layer. All of these behavioral and cellular phenotypes were prevented by imipramine, providing further support for the idea that reelin is involved in the pathogenesis of depression.

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Crossref · 10.1016/j.pnpbp.2015.02.001

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  • Imipramine is known to confer protection to depressive-like behavior through an increase in the dendritic arborization of immature neurons.

    “Likewise, imipramine is also known to confer protection to depressive-like behavior through an increase in the dendritic arborization of immature neurons.46”

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Authors
Fenton, E. Y., Fournier, N. M., Lussier, A. L., Romay-Tallon, R., Caruncho, H. J., & Kalynchuk, L. E.
Affiliations
  • University of Saskatchewan (CA)
  • Trent University (CA)
  • University of South Florida (US)
Corresponding author
Kalynchuk, Lisa E.
Venue
Progress in Neuro-Psychopharmacology and Biological Psychiatry
Publisher
Elsevier BV
Published
2015-07
Volume
60
Pages
52-59
ISSN
0278-5846 (ISSN-L)
OpenAlex
W2000875771
Cited by
69
References
45
Citations by year
2026: 1 · 2025: 4 · 2024: 3 · 2023: 4 · 2022: 8 · 2021: 5 · 2020: 6 · 2019: 5 · 2018: 9 · 2017: 12 · 2016: 10 · 2015: 2
FWCI
4.45
Type
journal article
Language
en
Open access
closed
Locations
  • Progress in Neuro-Psychopharmacology and Biological Psychiatry (publishedVersion)
  • PubMed (publishedVersion)
Funders
Natural Sciences and Engineering Council of Canada
Topics
  • Life Sciences › Neuroscience › Developmental Neuroscience › Neurogenesis and neuroplasticity mechanisms
  • Life Sciences › Neuroscience › Behavioral Neuroscience › Stress Responses and Cortisol
  • Health Sciences › Medicine › Pharmacology › Treatment of Major Depression
Keywords
imipramine, corticosterone, depression-like behavior, reelin, hippocampus, adult neurogenesis, neuronal maturation, dendritic complexity, subgranular zone, hippocampal granule cells, antidepressant effects, forced swim test, reeler mice
MeSH terms
Doublecortin Domain Proteins, Reelin Protein, Animals, Anti-Inflammatory Agents, Antidepressive Agents, Tricyclic, Corticosterone, Dendrites, Depression, Disease Models, Animal, Dose-Response Relationship, Drug, Gene Expression Regulation, Hippocampus, Imipramine, Male, Mice, Neurologic Mutants, Microtubule-Associated Proteins, Nerve Tissue Proteins, Neurons, Neuropeptides, Serine Endopeptidases, Swimming, Cell Adhesion Molecules, Neuronal, Extracellular Matrix Proteins, Rats, Long-Evans, Immobility Response, Tonic, Mice, Rats

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