Cited by 475Stress Responses and CortisolNeuroendocrine regulation and behaviorAnimal Behavior and Welfare Studies

Visible burrow system as a model of chronic social stress: behavioral and neuroendocrine correlates

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Blanchard, D.Caroline, Spencer, Robert L., Weiss, Scott M., Blanchard, Robert J., McEwen, Bruce, Sakai, Randall R.·1995·Psychoneuroendocrinology

Abstract

In mixed-sex rat groups maintained in visible burrow systems (VBS), consistent asymmetries in offensive and defensive behaviors of male dyads are associated with the development of dominance hierarchies. Subordinate males are characterized by particular wound patterns, severe weight loss, and a variety of behavioral changes, many of them isomorphic to target symptoms of clinical depression. In two VBS studies, subordinate males showed increased basal levels of plasma corticosterone (CORT), and increased adjusted adrenal and spleen weights compared to controls, and often, to dominants as well. Thymus weights and testosterone levels of subordinates were not reliably different in one study using highly aggressive males, but were reduced, along with testes weights, in a second study using unselected males. Glucocorticoid receptor binding levels in hippocampus, hypothalamus, and pituitary were not different, nor were aldosterone levels. When tested in a restraint stress procedure, subordinates had higher basal CORT levels, but about 40% of these animals showed a reduced, or absent, CORT response to restraint. These findings indicate that subordination may be reflected in high magnitude changes consistent with physiological indices of prolonged stress. Dominant rats of such groups may also show physiological changes suggesting stress, particularly when the groups are comprised of highly aggressive males only. The VBS colony model thus appears to enable rat groups to produce natural…

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Crossref · 10.1016/0306-4530(94)e0045-b

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  • Social defeat stress provides a potential means to investigate components of the basic neuropathology underlying affective illnesses, which is providing fundamentally new information about the molecular basis of affective disorders to aid in the development of novel antidepressant treatment strategies.

    “Thus, social defeat stress provides a potential means to investigate components of the basic neuropathology underlying affective illnesses8,33–36, which is providing fundamentally new information about the molecular basis of affective disorders to aid in the development of novel antidepressant treatment strategies20.”
  • In the visible burrow system, rats rapidly form stable dominance hierarchies.

    “This can be simulated in the laboratory using a visible burrow system, a semi-naturalistic enclosure that replicates many of the challenges and opportunities of group-living in nature; in this setting, rats rapidly form stable dominance hierarchies (Fig. 3) (Blanchard et al., 1995, Blanchard et al., 1988, Opendak et al., 2016).”
  • In LE rats in laboratory enclosure, subordinate rats have elevated CORT compared to dominants and can be prone to illness and weight loss due to chronic stress.

    “When LE rats form a dominance hierarchy within a laboratory enclosure, it has been shown that subordinate rats have elevated levels of CORT compared to dominants and can be prone to illness and weight loss due to chronic stress (Blanchard et al., 1995, Hardy et al., 2002).”

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Authors
Blanchard, D. C., Spencer, R. L., Weiss, S. M., Blanchard, R. J., McEwen, B., & Sakai, R. R.
Affiliations
  • University of Hawaii System (US)
  • Rockefeller University (US)
  • University of Hawaiʻi at Mānoa (US)
  • University of Pennsylvania (US)
Corresponding author
Blanchard, D.Caroline
Venue
Psychoneuroendocrinology
Publisher
Elsevier BV
Published
1995
Volume
20
Issue
2
Pages
117-134
ISSN
0306-4530 (ISSN-L)
OpenAlex
W2121061650
Cited by
475
References
53
Citations by year
2026: 5 · 2025: 5 · 2024: 6 · 2023: 12 · 2022: 11 · 2021: 12 · 2020: 7 · 2019: 17 · 2018: 12 · 2017: 28 · 2016: 24 · 2015: 24 · 2014: 22 · 2013: 19 · 2012: 29
FWCI
4.81
Type
journal article
Language
en
Open access
Locations
  • Psychoneuroendocrinology (publishedVersion, cc-by-nc-nd)
  • PubMed (publishedVersion)
Funders
  • National Institutes of Health (5r01da004081-03, 5r01aa006220-06, 5r01mh042803-03)
  • National Institute on Alcohol Abuse and Alcoholism (AA-06220)
  • National Institute of Mental Health (MH42803)
  • National Institute on Drug Abuse (DA04081)
Topics
  • Life Sciences › Neuroscience › Behavioral Neuroscience › Stress Responses and Cortisol
  • Social Sciences › Psychology › Social Psychology › Neuroendocrine regulation and behavior
  • Health Sciences › Veterinary › Small Animals › Animal Behavior and Welfare Studies
Keywords
chronic social stress, dominance hierarchy, subordination, depression-like behavior, corticosterone, neuroendocrine stress response, glucocorticoid receptor binding, restraint stress, testosterone, thymus weight, adrenal weight, spleen weight
MeSH terms
Adrenal Glands, Aggression, Aldosterone, Animals, Behavior, Animal, Body Weight, Corticosterone, Dominance-Subordination, Female, Male, Models, Psychological, Neurosecretory Systems, Organ Size, Receptors, Steroid, Social Behavior, Spleen, Stress, Psychological, Testosterone, Thymus Gland, Rats

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