Cited by 75Neuroscience and Neuropharmacology ResearchStress Responses and CortisolMemory and Neural Mechanisms

Effects of repeated stress on excitatory drive of basal amygdala neurons in vivo

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Padival, Mallika, Quinette, Danielle, Rosenkranz, J Amiel·2013·Neuropsychopharmacology

Abstract

Chronic stress leads to heightened affective behaviors, and can precipitate the emergence of depression and anxiety. These disorders are associated with increased amygdala activity. In animal models, chronic stress leads to increased amygdala-dependent behaviors, as well as hyperactivity of amygdala neurons. However, it is not known whether increased excitatory synaptic drive after chronic stress contributes to hyperactivity of basolateral amygdala (BLA; comprised of basal, lateral, and accessory basal nuclei) neurons. This study tested whether repeated stress causes an increase in excitatory drive of basal amygdala (BA) neurons in vivo, and whether this is correlated with an increase in the number of dendritic spines and a shift in dendritic distribution. Using in vivo intracellular recordings, this study found that repeated restraint stress caused an increase in the frequency of spontaneous excitatory synaptic events in vivo, which correlated with the number of dendritic spines in reconstructed neurons. Furthermore, parallel changes in the kinetics of the synaptic events and the distribution of spines indicated a more prominent functional contribution of synaptic inputs from across the dendritic tree. The shift in spine distribution across the dendritic tree was further confirmed with the examination of Golgi-stained tissue. This abnormal physiological drive of BA neurons after repeated stress may contribute to heightened affective responses after chronic stress. A reduction in the impact of excitatory drive in the BA may therefore be a potential treatment for the harmful effects of chronic stress in psychiatric disorders.

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Crossref · 10.1038/npp.2013.74

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  • Chronic stress results in an increase in dendritic arborization and spinogenesis on BLA pyramidal neurons, increasing their intrinsic excitability and afferent stimulation in a manner that correlates with heightened anxiety-like behavior.

    “Additionally, multiple studies have found that chronic stress results in an increase in dendritic arborization and spinogenesis on BLA pyramidal neurons, increasing their intrinsic excitability and afferent stimulation in a manner that correlates with heightened anxiety-like behavior [70–72].”

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  1. Paxinos G, Watson C (1998). The rat brain in stereotaxic coordinates, spiral bound. Academic Press: New York.

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Authors
Padival, M., Quinette, D., & Rosenkranz, J. A.
Affiliations
Rosalind Franklin University of Medicine and Science (US)
Corresponding author
Rosenkranz, J Amiel
Venue
Neuropsychopharmacology
Published
2013-03-27
Volume
38
Issue
9
Pages
1748-1762
ISSN
  • 0893-133X (ISSN-L)
  • 1740-634X
OpenAlex
W2161838364
Cited by
75
References
120
Citations by year
2026: 4 · 2025: 1 · 2024: 1 · 2023: 3 · 2022: 4 · 2021: 8 · 2020: 6 · 2019: 5 · 2018: 9 · 2017: 10 · 2016: 8 · 2015: 8 · 2014: 5 · 2013: 2 · 2012: 1
FWCI
3.76
Type
journal article
Language
en
Open access
Locations
  • Neuropsychopharmacology (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • Brain Research Foundation
  • National Institutes of Health
  • National Institute of Mental Health (MH084970, R01MH084970)
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Neuroscience › Behavioral Neuroscience › Stress Responses and Cortisol
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
Keywords
chronic stress, basal amygdala, dendritic spines, restraint stress, amygdala hyperactivity, depression, anxiety, dendritic trees, Golgi staining
MeSH terms
Amygdala, Animals, Dendrites, Male, Neurons, Stress, Psychological, Excitatory Postsynaptic Potentials, Dendritic Spines, Rats

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