Cited by 815Neurogenesis and neuroplasticity mechanismsStress Responses and CortisolMemory and Neural Mechanisms

Cell Proliferation in Adult Hippocampus is Decreased by Inescapable Stress: Reversal by Fluoxetine Treatment

Malberg, Jessica E, Duman, Ronald S·2003·Neuropsychopharmacology

Abstract

Adult hippocampal neurogenesis has been demonstrated in several species and is regulated by both environmental and pharmacological stimuli. The present study seeks to determine whether hippocampal proliferation and neurogenesis are altered in adult animals exposed to inescapable shock (IS) in the learned helplessness model of depression. We report that exposure to avoidance testing, regardless of pre-exposure to IS, decreases cell proliferation in the hippocampus, extending previous studies demonstrating downregulation of neurogenesis by exposure to acute stressors. In addition, when the analysis was conducted 9 days after exposure to IS we observed a significant decrease in cell proliferation compared to nonshocked animals. Administration of fluoxetine, a serotonin selective reuptake inhibitor, from days 2-8 blocked the downregulation of cell proliferation resulting from IS. Fluoxetine treatment also reversed the deficit in escape latency observed in animals exposed to IS. Finally, at the 9 day time point, there was no significant difference in blood levels of corticosterone between nonshocked and IS exposed animals, indicating that the decreased cell proliferation that is observed is not due to increased levels of this adrenal steroid. These findings demonstrate that exposure to IS, which results in a state of behavioral despair, decreases hippocampal cell proliferation and that this effect can be reversed by fluoxetine treatment.

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Crossref · 10.1038/sj.npp.1300234

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  • Acute and chronic stress suppress hippocampal cell proliferation.

    “In this study, we demonstrate that acute, and chronic, stress suppress hippocampal cell proliferation, consistent with previous reports (12, 32, 33) and that the antiproliferative effect of stress is blocked by inhibition of IL-1RI.”
  • BrdU immunohistochemistry and its quantitative analysis used a modified unbiased stereology protocol.

    “BrdU immunohistochemistry and its quantitative analysis by using a modified unbiased stereology protocol (12) was conducted as described in SI Methods.”

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Authors
Malberg, J. E., & Duman, R. S.
Affiliations
Yale University (US)
Corresponding author
Duman, Ronald S
Venue
Neuropsychopharmacology
Published
2003-05-15
Volume
28
Issue
9
Pages
1562-1571
ISSN
  • 0893-133X (ISSN-L)
  • 1740-634X
OpenAlex
W2093541378
Cited by
815
References
6
Citations by year
2026: 4 · 2025: 15 · 2024: 15 · 2023: 22 · 2022: 16 · 2021: 31 · 2020: 20 · 2019: 24 · 2018: 23 · 2017: 35 · 2016: 39 · 2015: 29 · 2014: 49 · 2013: 35 · 2012: 45
FWCI
11.79
Type
journal article
Language
en
Open access
closed
Locations
  • Neuropsychopharmacology (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • U.S. Public Health Service (2 PO1 MH25642, MH45481)
  • National Institute of Mental Health (2-PO1-MH25642, MH-45481, P01MH025642)
Topics
  • Life Sciences › Neuroscience › Developmental Neuroscience › Neurogenesis and neuroplasticity mechanisms
  • Life Sciences › Neuroscience › Behavioral Neuroscience › Stress Responses and Cortisol
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
Keywords
adult hippocampal neurogenesis, hippocampal cell proliferation, inescapable shock, learned helplessness, depression, fluoxetine, serotonin reuptake inhibitors, avoidance learning, escape latency, corticosterone, behavioral despair
MeSH terms
Animals, Behavior, Animal, Bromodeoxyuridine, Cell Count, Cell Division, Conditioning, Operant, Corticosterone, Depression, Disease Models, Animal, Electroshock, Escape Reaction, Fluoxetine, Helplessness, Learned, Hippocampus, Male, Nerve Growth Factors, S100 Proteins, Nuclear Proteins, Radiation-Sensitizing Agents, Reaction Time, Stress, Psychological, Time Factors, Rats, Sprague-Dawley, Antidepressive Agents, Second-Generation, Rats, S100 Calcium Binding Protein beta Subunit

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