Cited by 277Stress Responses and CortisolNeuroscience and Neuropharmacology ResearchMemory and Neural Mechanisms

Rapid glucocorticoid effects on excitatory amino acid levels in the hippocampus: a microdialysis study in freely moving rats

Venero, César, Borrell, José·1999·European Journal of Neuroscience

Abstract

Glucocorticoids can rapidly affect neuronal function and behaviour in mammals. Several studies have suggested the possible existence of rapid, non-genomic effects of glucocorticoids in the hippocampus. To investigate whether glucocorticoids could affect neurotransmission in the hippocampus through rapid, non-genomic mechanisms, we studied the effects of acute glucocorticoid administration on extracellular amino acid levels in the CA1 area of the hippocampus. By means of microdialysis on freely moving rats, we observed that an intraperitoneal injection of corticosterone (2.5 mg/kg) induced a rapid (within 15 min) and transient (returning to basal levels by 35-45 min) increase in extracellular aspartate and glutamate levels ( approximately 155-160%), both in sham-operated and adrenalectomized rats. These effects occurred in parallel with a rise in corticosterone concentration, also detected by microdialysis, in this hippocampal area. Intrahippocampal perfusion of corticosterone by retrodialysis also produced the same fast and reversible effects on excitatory amino acid (EAA) levels. Extracellular concentrations of taurine and gamma-aminobutyric acid (GABA) were unchanged after intrahippocampal glucocorticoid administration. This corticosterone-mediated rise in EAA levels was not inhibited by the presence of specific antagonists for the two types of intracellular corticosteroid receptors, nor by a protein synthesis inhibitor, anisomycin. Perfusion of dexamethasone, a synthetic glucocorticoid, elicited a similar effect to that observed with corticosterone treatment in all studied cases. However, non-glucocorticoid steroids did not affect amino acid transmission in this hippocampal area. These results indicate that glucocorticoids induce a rapid and transient increase in hippocampal EAA levels in vivo that might be exerted through a novel non-genomic mechanism of action.

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Crossref · 10.1046/j.1460-9568.1999.00668.x

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Authors
Venero, C., & Borrell, J.
Affiliations
Instituto Cajal (ES)
Venue
European Journal of Neuroscience
Publisher
Wiley
Published
1999-07
Volume
11
Issue
7
Pages
2465-2473
ISSN
  • 0953-816X (ISSN-L)
  • 1460-9568
OpenAlex
W1979948882
Cited by
277
References
56
Citations by year
2025: 2 · 2024: 5 · 2023: 6 · 2022: 3 · 2021: 7 · 2020: 5 · 2019: 8 · 2018: 7 · 2017: 10 · 2016: 8 · 2015: 13 · 2014: 19 · 2013: 13 · 2012: 16
FWCI
3.57
Type
journal article
Language
en
Open access
closed
Locations
  • European Journal of Neuroscience (publishedVersion)
  • PubMed (publishedVersion)
  • DIGITAL.CSIC (Spanish National Research Council (CSIC)) (submittedVersion)
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
glucocorticoids, non-genomic steroid action, excitatory amino acids, hippocampus, corticosterone, glutamate, aspartic acid, CA1, neurotransmission, dexamethasone, adrenalectomy, freely moving rats
MeSH terms
Adrenalectomy, Mineralocorticoid Receptor Antagonists, Animals, Calcium, Corticosterone, Dexamethasone, Glucocorticoids, Hippocampus, Injections, Injections, Intraperitoneal, Male, Mineralocorticoids, Protein Synthesis Inhibitors, Receptors, Glucocorticoid, Rats, Wistar, Microdialysis, Excitatory Amino Acids, Rats

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