Cited by 556Stress Responses and CortisolPosttraumatic Stress Disorder ResearchAdrenal Hormones and Disorders

Stress-restress: Effects on ACTH and fast feedback

Liberzon, Israel, Krstov, Melissa, Young, Elizabeth A.·1997·Psychoneuroendocrinology

Abstract

Glucocorticoid secretion is tightly regulated by negative feedback. Glucocorticoid feedback has been found to be altered in depression and post-traumatic stress disorder (PTSD). While hyposensitive glucocorticoid feedback has been found in depression, hypersensitive or enhanced negative feedback was described in PTSD. Enhanced negative feedback, can be seen as a sensitization of the inhibitory elements of HPA axis, and stress-restress or time dependent sensitization (TDS) model, has been suggested as an animal model for PTSD. We have studied the effects of this model on the HPA axis to determine whether it will produce increased sensitivity to negative feedback as found in PTSD patients. Adult Sprague-Dawley male rats were exposed to a single session of prolonged stress (restraint followed by a forced swim and exposure to ether vapors) and briefly restressed 7 days later. The effects of single prolonged stress on plasma ACTH and corticosterone responses (0, 5, and 30 min) and on glucocorticoid fast feedback (cortisol vs. saline pretreatment) were assessed in two studies. Animals exposed to single prolonged stress showed enhanced negative feedback in comparison to naive animals (F = 4.6371, df = 3, p = .0107), but there was no difference in ACTH or corticosterone responses during the restress. Pretreatment with cortisol, in the first stress session, did not prevent the development of the enhanced fast feedback when restressed. This can be seen as a sensitization of the inhibitory elements of HPA axis, suggesting that stress-restress paradigm might serve as a good animal model for HPA abnormalities found in PTSD patients.

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Crossref · 10.1016/s0306-4530(97)00044-9

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Authors
Liberzon, I., Krstov, M., & Young, E. A.
Affiliations
  • United States Department of Veterans Affairs (US)
  • University of Michigan (US)
Corresponding author
Liberzon, Israel
Venue
Psychoneuroendocrinology
Publisher
Elsevier BV
Published
1997-08
Volume
22
Issue
6
Pages
443-453
ISSN
0306-4530 (ISSN-L)
OpenAlex
W2039047753
Cited by
556
References
32
Citations by year
2026: 22 · 2025: 35 · 2024: 21 · 2023: 26 · 2022: 28 · 2021: 25 · 2020: 33 · 2019: 40 · 2018: 36 · 2017: 28 · 2016: 35 · 2015: 32 · 2014: 31 · 2013: 27 · 2012: 15
FWCI
1.78
Type
journal article
Language
en
Open access
closed
Locations
  • Psychoneuroendocrinology (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health (5r29mh045232-05)
  • National Institute of Mental Health (MH-00427, MH 45232)
Topics
  • Life Sciences › Neuroscience › Behavioral Neuroscience › Stress Responses and Cortisol
  • Social Sciences › Psychology › Clinical Psychology › Posttraumatic Stress Disorder Research
  • Health Sciences › Medicine › Endocrinology, Diabetes and Metabolism › Adrenal Hormones and Disorders
Keywords
post-traumatic stress disorder, glucocorticoid negative feedback, hypothalamic-pituitary-adrenal axis, ACTH, corticosterone, long-term stress, animal model of PTSD
MeSH terms
Adrenocorticotropic Hormone, Animals, Corticosterone, Feedback, Hydrocortisone, Hypothalamo-Hypophyseal System, Immunoassay, Male, Restraint, Physical, Stress Disorders, Post-Traumatic, Stress, Psychological, Rats, Sprague-Dawley, Rats

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