Cited by 154Posttraumatic Stress Disorder ResearchMemory and Neural MechanismsStress Responses and Cortisol

Importance of early environment in the development of post-traumatic stress disorder-like behaviors

Imanaka, Akihiro, Morinobu, Shigeru, Toki, Shigeru, Yamawaki, Shigeto·2006·Behavioural Brain Research

Abstract

A number of clinical studies in which early adversities were defined retrospectively, demonstrated that early adverse experiences increased the morbidity rate of post-traumatic stress disorder (PTSD) in later life. However, no prospective studies have yet been conducted to elucidate whether early adversity affects the risk or severity of PTSD. Thus, we examined whether early adversity would strengthen the severity of PTSD symptoms in later life by using neonatal isolation (NI) and single prolonged stress (SPS) as an animal model of PTSD. We measured anxiety-like behavior in the elevated plus maze (EPM), contextual freezing in the contextual fear (CF) test, and analgesia in the flinch-jump and hot-plate tests in four groups of adult rats (sham, NI, SPS, and NI+SPS). NI significantly enhanced the SPS-induced decrease in the percentage of open arm time and open arm entries in the EPM, enhanced the SPS-induced increase in contextual freezing, and strengthened SPS-induced analgesia, without any changes in locomotor activity in the open field locomotor test. In addition, we examined the effect of environmental enrichment (EE). Repeated exposure to EE ameliorated the NI-induced enhancement of contextual freezing, but not anxiety-like behavior or analgesia, in response to SPS. The results of the present study demonstrated that while early adversity strengthened PTSD-like symptoms, EE alleviated the enhanced contextual freezing by NI and SPS. These findings suggest that early adversity may worsen dysfunction of the amygdala and hippocampus in PTSD, and an early intervention may alleviate the early adversity-mediated enhancement of hippocampal dysfunction in PTSD.

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Crossref · 10.1016/j.bbr.2006.06.012

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Authors
Imanaka, A., Morinobu, S., Toki, S., & Yamawaki, S.
Affiliations
Hiroshima University (JP)
Corresponding author
Yamawaki, Shigeto
Venue
Behavioural Brain Research
Publisher
Elsevier BV
Published
2006-10
Volume
173
Issue
1
Pages
129-137
ISSN
0166-4328 (ISSN-L)
OpenAlex
W1978971276
Cited by
154
References
44
Citations by year
2026: 3 · 2025: 9 · 2024: 6 · 2023: 9 · 2022: 5 · 2021: 9 · 2020: 6 · 2019: 8 · 2018: 3 · 2017: 14 · 2016: 5 · 2015: 8 · 2014: 16 · 2013: 10 · 2012: 9
FWCI
7.74
Type
journal article
Language
en
Open access
closed
Locations
  • Behavioural Brain Research (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Ministry of Education, Culture, Sports, Science and Technology
  • Ministry of Health, Labour and Welfare
Topics
  • Social Sciences › Psychology › Clinical Psychology › Posttraumatic Stress Disorder Research
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
  • Life Sciences › Neuroscience › Behavioral Neuroscience › Stress Responses and Cortisol
Keywords
post-traumatic stress disorder, childhood adversity, neonatal isolation, single prolonged stress, environmental enrichment, anxiety-like behavior, contextual fear, analgesia, hippocampal dysfunction, amygdala, animal model of PTSD, early intervention
MeSH terms
Age Factors, Animals, Anxiety, Conditioning, Classical, Disease Models, Animal, Environment, Exploratory Behavior, Fear, Female, Male, Random Allocation, Social Isolation, Stress Disorders, Post-Traumatic, Stress, Psychological, Rats, Sprague-Dawley, Freezing Reaction, Cataleptic, Rats

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