Cited by 496Neurotransmitter Receptor Influence on BehaviorStress Responses and CortisolNeuroscience and Neuropharmacology Research

Social defeat stress selectively alters mesocorticolimbic dopamine release: an in vivo microdialysis study

Tidey, Jennifer W., Miczek, Klaus A.·1996·Brain Research

Abstract

Exposure to various aversive stimuli ('stressors') as well as positively-reinforcing stimuli has been shown to increase extracellular dopamine concentrations in terminal areas of the mesocorticolimbic dopamine system. The magnitude and site specificity of the dopaminergic response may depend on the nature of the aversive stimulus. In the present study, in vivo microdialysis was used to examine the effects of an ethologically relevant stressor, namely threat of social defeat, on dopamine concentrations in nucleus accumbens, striatum, and prefrontal cortex of freely-moving male Long-Evans rats. During the test session, dialysate and video recording samples were collected from previously-defeated 'intruder' rats in consecutive phases, while (1) in the home cage, (2) when placed in the empty, soiled cage of a resident rat which had previously defeated them, (3) when exposed to threat of defeat by the resident, and (4) when returned to their home cages. Control animals were not defeated; in this group of rats video recording and dialysate samples were obtained when they were placed into an empty, clean novel cage and later returned to their home cage. The results indicated that levels of dopamine were elevated to approximately 130% of baseline in nucleus accumbens and prefrontal cortex when rats were placed into either the resident or novel cage. In defeated intruders, extracellular dopamine levels in accumbens and prefrontal cortex were increased further (approximately 160% of baseline), during social threat; these biochemical changes were synchronous with high levels of orienting toward the resident but not with heightened motor activity. Extracellular dopamine levels in lateral striatum were not affected by either manipulation. These results suggest that altered accumbens and cortical extracellular dopamine concentrations during social threat are not secondary to motor activation but instead reflect increased attention to the provocative stimulus or attempts by the intruder to 'cope' with the stimulus.

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Crossref · 10.1016/0006-8993(96)00159-x

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Authors
Tidey, J. W., & Miczek, K. A.
Affiliations
Tufts University (US)
Corresponding author
Miczek, Klaus A.
Venue
Brain Research
Publisher
Elsevier BV
Published
1996-05
Volume
721
Issue
1-2
Pages
140-149
ISSN
0006-8993 (ISSN-L)
OpenAlex
W2033735816
Cited by
496
References
0
Citations by year
2026: 6 · 2025: 9 · 2024: 13 · 2023: 11 · 2022: 13 · 2021: 16 · 2020: 16 · 2019: 17 · 2018: 27 · 2017: 18 · 2016: 36 · 2015: 31 · 2014: 27 · 2013: 28 · 2012: 21
FWCI
2.75
Type
journal article
Language
en
Open access
closed
Locations
  • Brain Research (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurotransmitter Receptor Influence on Behavior
  • Life Sciences › Neuroscience › Behavioral Neuroscience › Stress Responses and Cortisol
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
Keywords
social defeat stress, mesocorticolimbic dopamine system, extracellular dopamine, nucleus accumbens, prefrontal cortex, lateral striatum, social danger, orienting, coping, aversive stimuli, Long-Evans rats
MeSH terms
Animals, Chromatography, High Pressure Liquid, Dopamine, Homovanillic Acid, Male, Motor Activity, Nucleus Accumbens, Social Behavior, Social Dominance, Stress, Psychological, 3,4-Dihydroxyphenylacetic Acid, Neostriatum, Prefrontal Cortex, Microdialysis, Rats

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