Importance of early environment in the development of post-traumatic stress disorder-like behaviors
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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SPS rats exhibit stress-induced analgesia compared to Sham rats.
“Furthermore, we recently demonstrated that SPS rats exhibit enhanced contextual freezing, increased anxiety-like behavior in the elevated plus maze, and stress-induced analgesia compared to rats subjected to Sham treatment (Imanaka et al, 2006;Takahashi et al, 2006).”
From Effects of Single Prolonged Stress and D-Cycloserine on Contextual Fear Extinction and Hippocampal NMDA Receptor Expression in a Rat Model of PTSD (2008) · cites this paper as Imanaka et al, 2006
SPS rats exhibit enhanced contextual freezing compared to Sham rats.
“Furthermore, we recently demonstrated that SPS rats exhibit enhanced contextual freezing, increased anxiety-like behavior in the elevated plus maze, and stress-induced analgesia compared to rats subjected to Sham treatment (Imanaka et al, 2006;Takahashi et al, 2006).”
From Effects of Single Prolonged Stress and D-Cycloserine on Contextual Fear Extinction and Hippocampal NMDA Receptor Expression in a Rat Model of PTSD (2008) · cites this paper as Imanaka et al, 2006
SPS rats exhibit increased anxiety-like behavior in the elevated plus maze compared to Sham rats.
“Furthermore, we recently demonstrated that SPS rats exhibit enhanced contextual freezing, increased anxiety-like behavior in the elevated plus maze, and stress-induced analgesia compared to rats subjected to Sham treatment (Imanaka et al, 2006;Takahashi et al, 2006).”
From Effects of Single Prolonged Stress and D-Cycloserine on Contextual Fear Extinction and Hippocampal NMDA Receptor Expression in a Rat Model of PTSD (2008) · cites this paper as Imanaka et al, 2006
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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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