Cited by 151Neuroscience and Neuropharmacology ResearchStress Responses and CortisolMemory and Neural Mechanisms

Dysfunctional astrocytic and synaptic regulation of hypothalamic glutamatergic transmission in a mouse model of early-life adversity: relevance to neurosteroids and programming of the stress response

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Gunn, Benjamin G., Cunningham, Linda, Cooper, Michelle A., Corteen, Nicole L., Seifi, Mohsen, Swinny, Jerome D., Lambert, Jeremy J., Belelli, Delia·2013·The Journal of Neuroscience

Abstract

Adverse early-life experiences, such as poor maternal care, program an abnormal stress response that may involve an altered balance between excitatory and inhibitory signals. Here, we explored how early-life stress (ELS) affects excitatory and inhibitory transmission in corticotrophin-releasing factor (CRF)-expressing dorsal-medial (mpd) neurons of the neonatal mouse hypothalamus. We report that ELS associates with enhanced excitatory glutamatergic transmission that is manifested as an increased frequency of synaptic events and increased extrasynaptic conductance, with the latter associated with dysfunctional astrocytic regulation of glutamate levels. The neurosteroid 5α-pregnan-3α-ol-20-one (5α3α-THPROG) is an endogenous, positive modulator of GABAA receptors (GABAARs) that is abundant during brain development and rises rapidly during acute stress, thereby enhancing inhibition to curtail stress-induced activation of the hypothalamic-pituitary-adrenocortical axis. In control mpd neurons, 5α3α-THPROG potently suppressed neuronal discharge, but this action was greatly compromised by prior ELS exposure. This neurosteroid insensitivity did not primarily result from perturbations of GABAergic inhibition, but rather arose functionally from the increased excitatory drive onto mpd neurons. Previous reports indicated that mice (dams) lacking the GABAAR δ subunit (δ(0/0)) exhibit altered maternal behavior. Intriguingly, δ(0/0) offspring showed some hallmarks of abnormal maternal care that were further exacerbated by ELS. Moreover, in common with ELS, mpd neurons of δ(0/0) pups exhibited increased synaptic and extrasynaptic glutamatergic transmission and consequently a blunted neurosteroid suppression of neuronal firing. This study reveals that increased synaptic and tonic glutamatergic transmission may be a common maladaptation to ELS, leading to enhanced excitation of CRF-releasing neurons, and identifies neurosteroids as putative early regulators of the stress neurocircuitry.

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Authors
Gunn, B. G., Cunningham, L., Cooper, M. A., Corteen, N. L., Seifi, M., Swinny, J. D., Lambert, J. J., & Belelli, D.
Affiliations
  • University of Dundee (GB)
  • University of Portsmouth (GB)
Venue
The Journal of Neuroscience
Published
2013-12-11
Volume
33
Issue
50
Pages
19534-19554
ISSN
  • 0270-6474 (ISSN-L)
  • 1529-2401
OpenAlex
W1994143964
Cited by
151
References
93
Citations by year
2026: 5 · 2025: 7 · 2024: 17 · 2023: 8 · 2022: 11 · 2021: 15 · 2020: 15 · 2019: 17 · 2018: 12 · 2017: 12 · 2016: 4 · 2015: 12 · 2014: 15 · 2013: 1
FWCI
5.24
Type
journal article
Language
en
Open access
Locations
  • Journal of Neuroscience (publishedVersion, cc-by-nc-sa)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • Discovery Research Portal (University of Dundee) (publishedVersion)
  • Solent University Research Portal (Solent University) (submittedVersion, other-oa)
Funders
  • Wellbeing of Women (RG1265)
  • Tenovus
  • Directorate for Biological Sciences
  • Biotechnology and Biological Sciences Research Council (11426)
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
childhood adversity, astrocytes, extrasynaptic glutamate, neurosteroids, GABAergic inhibition, maternal care, hypothalamic-pituitary-adrenal axis, excitation-inhibition balance, neonatal mice
MeSH terms
Action Potentials, Animals, Astrocytes, Corticotropin-Releasing Hormone, Disease Models, Animal, Hypothalamus, Synaptic Transmission, Neurons, Receptors, GABA-A, Stress, Psychological, Synapses, Neurotransmitter Agents, Mice

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