Cited by 70Stress Responses and CortisolNeuroendocrine regulation and behaviorNeuropeptides and Animal Physiology

Social defeat stress activates medial amygdala cells that express type 2 corticotropin-releasing factor receptor mRNA

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Fekete, É.M., Zhao, Y., Li, C., Sabino, V., Vale, W.W., Zorrilla, E.P.·2009·Neuroscience

Abstract

Defeat is a social stressor involving subordination by a threatening conspecific. Type 2 corticotropin-releasing factor receptors (CRF(2)) are abundant in brain regions implicated in defeat responses and are putative stress-related molecules. The present study sought to determine whether neuroactivation and CRF(2) expression co-occurred at brain region or cellular levels following acute defeat. Male "intruder" Wistar rats were placed into the cage of an aggressive "resident" Long-Evans rat (n=6). Upon defeat, intruders (n=6) were placed in a wire-mesh chamber and were returned to the resident's cage for an additional 75 min. Controls (n=6) were handled and returned to their home cage for the same duration. Coronal brain sections were stained for an immediate early gene product, Fos, as a neuronal activation marker. Combined immunohistochemistry with in situ hybridization was performed on a subset of brain sections from defeated intruders to visualize Fos immunoreactivity and CRF(2) mRNA jointly. Defeated rats had fivefold, sevenfold, and 10-fold more Fos-positive cells than controls in the arcuate, ventromedial nucleus of the hypothalamus, and medial amygdala post-defeat. Significant colocalization of CRF(2) mRNA and Fos-positive cells was observed in the posterior medial amygdala but not in the arcuate nucleus or ventromedial hypothalamus. The results indicate CRF(2) receptor-positive neurons in the posterior medial amygdala are involved in the neural response to social defeat.

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Crossref · 10.1016/j.neuroscience.2009.03.078

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Authors
Fekete, É. M., Zhao, Y., Li, C., Sabino, V., Vale, W. W., & Zorrilla, E. P.
Affiliations
  • Scripps Research Institute (US)
  • University of Virginia (US)
  • Salk Institute for Biological Studies (US)
Corresponding author
Zorrilla, E.P.
Venue
Neuroscience
Publisher
Elsevier BV
Published
2009-08
Volume
162
Issue
1
Pages
5-13
ISSN
0306-4522 (ISSN-L)
OpenAlex
W2000911005
Cited by
70
References
88
Citations by year
2026: 1 · 2025: 4 · 2024: 2 · 2023: 3 · 2022: 7 · 2021: 2 · 2020: 4 · 2019: 1 · 2018: 7 · 2017: 3 · 2016: 2 · 2015: 5 · 2014: 8 · 2013: 5 · 2012: 7
FWCI
2.04
Type
journal article
Language
en
Open access
Locations
  • Neuroscience (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
National Institute of Diabetes and Digestive and Kidney Diseases (P01DK026741)
Topics
  • Life Sciences › Neuroscience › Behavioral Neuroscience › Stress Responses and Cortisol
  • Social Sciences › Psychology › Social Psychology › Neuroendocrine regulation and behavior
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuropeptides and Animal Physiology
Keywords
social defeat stress, CrF2, medial amygdala, FOS, immediate early gene expression, hypothalamic arcuate nucleus, ventromedial hypothalamus, neuronal activation, stress response
MeSH terms
Amygdala, Animals, Arcuate Nucleus of Hypothalamus, Dominance-Subordination, Immunohistochemistry, Male, Neurons, RNA, Messenger, Stress, Psychological, Ventromedial Hypothalamic Nucleus, Prosencephalon, Proto-Oncogene Proteins c-fos, Rats, Wistar, In Situ Hybridization, Receptors, Corticotropin-Releasing Hormone, Rats, Long-Evans, Rats

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