Cited by 41Memory and Neural MechanismsNeuroscience and Neuropharmacology ResearchStress Responses and Cortisol

Alterations in neuronal morphology in infralimbic cortex predict resistance to fear extinction following acute stress

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Moench, Kelly M., Maroun, Mouna, Kavushansky, Alexandra, Wellman, Cara·2016·Neurobiology of Stress

Abstract

Dysfunction in corticolimbic circuits that mediate the extinction of learned fear responses is thought to underlie the perseveration of fear in stress-related psychopathologies, including post-traumatic stress disorder. Chronic stress produces dendritic hypertrophy in basolateral amygdala (BLA) and dendritic hypotrophy in medial prefrontal cortex, whereas acute stress leads to hypotrophy in both BLA and prelimbic cortex. Additionally, both chronic and acute stress impair extinction retrieval. Here, we examined the effects of a single elevated platform stress on extinction learning and dendritic morphology in infralimbic cortex, a region considered to be critical for extinction. Acute stress produced resistance to extinction, as well as dendritic retraction in infralimbic cortex. Spine density on apical and basilar terminal branches was unaffected by stress. However, animals that underwent conditioning and extinction had decreased spine density on apical terminal branches. Thus, whereas dendritic morphology in infralimbic cortex appears to be particularly sensitive to stress, changes in spines may more sensitively reflect learning. Further, in stressed rats that underwent conditioning and extinction, the level of extinction learning was correlated with spine densities, in that rats with poorer extinction retrieval had more immature spines and fewer thin spines than rats with better extinction retrieval, suggesting that stress may have impaired learning-related spine plasticity. These results may have implications for understanding the role of medial prefrontal cortex in learning deficits associated with stress-related pathologies.

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Crossref · 10.1016/j.ynstr.2015.12.002

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  • The infralimbic cortex is involved in coping with chronic stress, eventually leading to structural changes and prefrontal dysfunction.

    “The most ventral subdomain of the mPFC is the infralimbic cortex (IL) and is involved in coping with chronic stress eventually leading to structural changes and prefrontal dysfunction [5–11].”

    From Development of prefrontal cortex (2022) · cites this paper as [7]

    The Discussion (Stress-induced changes in IL dendritic morphology; page unavailable) reports dendritic retraction in infralimbic cortex following chronic stress, and the Conclusion links the study’s findings to stress-induced medial prefrontal dysfunction. The paper does not specifically describe the infralimbic cortex as coping with chronic stress or establish that chronic-stress-related structural changes lead to prefrontal dysfunction; its own experiment examined acute stress. (LLM, conf=0.82)

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  1. Zilles K. Wree A. Cortex: areal and laminal structure Paxinos G. The Rat Nervous System 1995 Academic Press San Diego, CA 649 685

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Authors
Moench, K. M., Maroun, M., Kavushansky, A., & Wellman, C.
Affiliations
  • Indiana University Bloomington (US)
  • University of Haifa (IL)
Corresponding author
Wellman, Cara
Venue
Neurobiology of Stress
Publisher
Elsevier BV
Published
2016-06
Volume
3
Pages
23-33
ISSN
2352-2895 (ISSN-L)
OpenAlex
W2220058171
Cited by
41
References
73
Citations by year
2026: 3 · 2025: 1 · 2024: 2 · 2023: 2 · 2022: 5 · 2021: 5 · 2020: 3 · 2019: 6 · 2018: 6 · 2017: 5 · 2016: 3
FWCI
2.80
Type
journal article
Language
en
Open access
Locations
  • Neurobiology of Stress (publishedVersion, cc-by-nc-nd)
  • PubMed Central (publishedVersion, cc-by-nc-nd)
  • PubMed (publishedVersion)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
Funders
US-Israel Binational Science Foundation (2013292)
Topics
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Neuroscience › Behavioral Neuroscience › Stress Responses and Cortisol
Keywords
infralimbic cortex, fear extinction, acute stress, dendritic morphology, dendritic retraction, dendritic spine density, spine plasticity, medial prefrontal cortex, corticolimbic circuits, post-traumatic stress disorder, extinction retrieval

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