Cited by 175Stress Responses and CortisolNeuroscience and Neuropharmacology ResearchMemory and Neural Mechanisms

Experience-induced changes of dendritic spine densities in the prefrontal and sensory cortex: correlation with developmental time windows

Bock, Jörg, Gruss, Michael, Becker, Susann, Braun, Katharina·2005·Cerebral Cortex

Abstract

The present study provides evidence for the hypothesis that the extent and the direction of experience-induced synaptic changes in cortical areas correlates with time windows of neuronal as well as endocrine development. Repeated brief exposure to maternal separation prior to the stress hyporesponsive period (SHRP) of the hypothalamic-pituitary-adrenal (HPA) axis induced significantly reduced dendritic spine density (-16%) in layer II/III pyramidal neurons of the anterior cingulate cortex (ACd) of 21-day-old rats, whereas separation after termination of the SHRP resulted in increased spine densities (+16%) in this neuron type. In addition, rats of both groups displayed elevated basal plasma levels of corticosterone at this age. Separation during the SHRP (postnatal days 5-7) did not influence spine density in the ACd, and basal corticosterone levels remained unchanged. In contrast, pyramidal neurons in the somatosensory cortex (SSC) displayed significantly enhanced spine densities (up to 52% increase) independent from the time of separation. These results indicate that alterations in the synaptic balance in limbic and sensory cortical regions in response to early emotional experience are region-specific and related to the maturational stage of endocrine and neuronal systems.

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  • Maternal separation or other disruptions to the early environment change neuronal morphology of the frontal cortex in rodents.

    “Studies assessing the effects of stress during the first weeks of life in rodents indicate that maternal separation or other disruptions to the early environment change neuronal morphology of the frontal cortex (Brenhouse et al., 2013; Bock et al., 2005; Chocyk et al., 2013; Monroy et al., 2010; Muhammad and Kolb, 2011; Yang et al., 2015).”

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Authors
Bock, J., Gruss, M., Becker, S., & Braun, K.
Affiliations
Otto-von-Guericke-Universität Magdeburg (DE)
Corresponding author
Bock, Jörg
Venue
Cerebral Cortex
Published
2004-09-15
Volume
15
Issue
6
Pages
802-808
ISSN
  • 1047-3211 (ISSN-L)
  • 1460-2199
OpenAlex
W2142364482
Cited by
175
References
57
Citations by year
2026: 2 · 2025: 2 · 2024: 6 · 2023: 2 · 2022: 5 · 2021: 4 · 2020: 10 · 2019: 5 · 2018: 12 · 2017: 14 · 2016: 9 · 2015: 10 · 2014: 21 · 2013: 14 · 2012: 11
FWCI
1.88
Type
journal article
Language
en
Open access
closed
Locations
  • Cerebral Cortex (publishedVersion)
  • PubMed (publishedVersion)
Funders
Leibniz-Gemeinschaft
Topics
  • Life Sciences › Neuroscience › Behavioral Neuroscience › Stress Responses and Cortisol
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
Keywords
dendritic spine density, experience-dependent synaptic plasticity, maternal separation, stress hyporesponsive period, hypothalamic-pituitary-adrenal axis, corticosterone, anterior cingulate cortex, somatosensory cortex, pyramidal neurons, cortical development, emotional experience
MeSH terms
Animals, Body Weight, Corticosterone, Gyrus Cinguli, Hypothalamo-Hypophyseal System, Limbic System, Male, Organ Size, Pituitary-Adrenal System, Social Isolation, Somatosensory Cortex, Stress, Psychological, Rats, Wistar, Prefrontal Cortex, Pyramidal Cells, Dendritic Spines, Rats

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