Overlapping neurobiology of learned helplessness and conditioned defeat: Implications for PTSD and mood disorders
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Exposure to traumatic events can increase the risk for major depressive disorder (MDD) as well as posttraumatic stress disorder (PTSD), and pharmacological treatments for these disorders often involve the modulation of serotonergic (5-HT) systems. Several behavioral paradigms in rodents produce changes in behavior that resemble symptoms of MDD and these behavioral changes are sensitive to antidepressant treatments. Here we review two animal models in which MDD-like behavioral changes are elicited by exposure to an acute traumatic event during adulthood, learned helplessness (LH) and conditioned defeat. In LH, exposure of rats to inescapable, but not escapable, tailshock produces a constellation of behavioral changes that include deficits in fight/flight responding and enhanced anxiety-like behavior. In conditioned defeat, exposure of Syrian hamsters to a social defeat by a more aggressive animal leads to a loss of territorial aggression and an increase in submissive and defensive behaviors in subsequent encounters with non-aggressive conspecifics. Investigations into the neural substrates that control LH and conditioned defeat revealed that increased 5-HT activity in the dorsal raphe nucleus (DRN) is critical for both models. Other key brain regions that regulate the acquisition and/or expression of behavior in these two paradigms include the basolateral amygdala (BLA), central nucleus of the amygdala (CeA) and bed nucleus of the stria terminalis (BNST). In this review, we compare and contrast the role of each of these neural structures in mediating LH and conditioned defeat, and discuss the relevance of these data in developing a better understanding of the mechanisms underlying trauma-related depression. This article is part of a Special Issue entitled 'Post-Traumatic Stress Disorder'.
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The BNST has been implicated in behavioral changes associated with depression; BNST activity has been related to anhedonic behavior after chronic mild stress, and lesions in this structure block the onset of learned helplessness in preclinical models.
“The BNST has also been implicated in behavioral changes associated with depression; in particular, BNST activity has been related to anhedonic behavior after chronic mild stress, whereas lesions in this structure block the onset of learned helplessness in preclinical models [52].”
From The bed nucleus of the stria terminalis as a brain correlate of psychological inflexibility in fibromyalgia (2020) · cites this paper as [52]
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- Authors
- Hammack, S. E., Cooper, M. A., & Lezak, K. R.
- Affiliations
- University of Vermont (US)
- University of Tennessee at Knoxville (US)
- Corresponding author
- Hammack, Sayamwong E.
- Venue
- Neuropharmacology
- Publisher
- Elsevier BV
- Published
- 2012-02
- Volume
- 62
- Issue
- 2
- Pages
- 565-575
- ISSN
- 0028-3908 (ISSN-L)
- PMC
- PMC3433056
- OpenAlex
- W2152055098
- Cited by
- 142
- References
- 153
- Citations by year
- 2026: 1 · 2025: 7 · 2024: 6 · 2023: 10 · 2022: 10 · 2021: 10 · 2020: 13 · 2019: 12 · 2018: 10 · 2017: 9 · 2016: 8 · 2015: 12 · 2014: 15 · 2013: 11 · 2012: 7
- FWCI
- 1.04
- Type
- journal article
- Language
- en
- Open access
- green
- www.ncbi.nlm.nih.gov
- Locations
- Neuropharmacology (publishedVersion)
- PubMed (publishedVersion)
- Europe PMC (PubMed Central) (acceptedVersion)
- PubMed Central (acceptedVersion)
- Funders
- National Institute of Mental Health (R21MH085230)
- Topics
- Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurotransmitter Receptor Influence on Behavior
- Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
- Life Sciences › Neuroscience › Behavioral Neuroscience › Stress Responses and Cortisol
- Keywords
- learned helplessness, major depressive disorder, post-traumatic stress disorder, serotonergic system, dorsal raphe nucleus, amygdala, basolateral amygdala, central amygdala, bed nucleus of the stria terminalis, social defeat, animal models of depression, antidepressant treatment
- MeSH terms
- Animals, Behavior, Animal, Brain, Conditioning, Psychological, Disease Models, Animal, Dominance-Subordination, Fear, Cricetinae, Helplessness, Learned, Stress Disorders, Post-Traumatic, Mood Disorders, Rats
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