Cited by 81Neuroscience and Neuropharmacology ResearchStress Responses and CortisolMemory and Neural Mechanisms

Localization of Mineralocorticoid Receptors at Mammalian Synapses

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Prager, Eric M., Brielmaier, Jennifer, Bergstrom, Hadley C., McGuire, Jennifer, Johnson, Luke R.·2010·PLoS ONE

Abstract

In the brain, membrane associated nongenomic steroid receptors can induce fast-acting responses to ion conductance and second messenger systems of neurons. Emerging data suggest that membrane associated glucocorticoid and mineralocorticoid receptors may directly regulate synaptic excitability during times of stress when adrenal hormones are elevated. As the key neuron signaling interface, the synapse is involved in learning and memory, including traumatic memories during times of stress. The lateral amygdala is a key site for synaptic plasticity underlying conditioned fear, which can both trigger and be coincident with the stress response. A large body of electrophysiological data shows rapid regulation of neuronal excitability by steroid hormone receptors. Despite the importance of these receptors, to date, only the glucocorticoid receptor has been anatomically localized to the membrane. We investigated the subcellular sites of mineralocorticoid receptors in the lateral amygdala of the Sprague-Dawley rat. Immunoblot analysis revealed the presence of mineralocorticoid receptors in the amygdala. Using electron microscopy, we found mineralocorticoid receptors expressed at both nuclear including: glutamatergic and GABAergic neurons and extra nuclear sites including: presynaptic terminals, neuronal dendrites, and dendritic spines. Importantly we also observed mineralocorticoid receptors at postsynaptic membrane densities of excitatory synapses. These data provide direct anatomical evidence supporting the concept that, at some synapses, synaptic transmission is regulated by mineralocorticoid receptors. Thus part of the stress signaling response in the brain is a direct modulation of the synapse itself by adrenal steroids.

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Crossref · 10.1371/journal.pone.0014344

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Authors
Prager, E. M., Brielmaier, J., Bergstrom, H. C., McGuire, J., & Johnson, L. R.
Affiliations
Uniformed Services University of the Health Sciences (US)
Corresponding author
Johnson, Luke R.
Venue
PLoS ONE
Published
2010-12-15
Volume
5
Issue
12
Pages
e14344
ISSN
1932-6203 (ISSN-L)
OpenAlex
W2163744753
Cited by
81
References
87
Citations by year
2026: 2 · 2025: 3 · 2024: 1 · 2023: 1 · 2022: 2 · 2021: 2 · 2020: 8 · 2019: 3 · 2018: 4 · 2017: 8 · 2016: 8 · 2015: 3 · 2014: 8 · 2013: 7 · 2012: 13
FWCI
3.49
Type
journal article
Language
en
Open access
Locations
  • PLoS ONE (publishedVersion, public-domain)
  • PubMed Central (publishedVersion, public-domain)
  • PubMed (publishedVersion)
  • QUT ePrints (Queensland University of Technology) (submittedVersion, cc-by)
  • DOAJ (DOAJ: Directory of Open Access Journals) (submittedVersion, cc-by-sa)
  • Figshare (submittedVersion, cc-by)
  • Faculty of Health
Funders
Uniformed Services University of the Health Sciences
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
mineralocorticoid receptor, synapses, lateral amygdala, postsynaptic membrane, presynaptic terminals, dendritic spines, synaptic plasticity, stress response, glucocorticoid receptor, fear conditioning, glutamatergic neurons, GABAergic neurons, adrenal steroids, synaptic transmission
MeSH terms
Amygdala, Animals, Brain, Cell Nucleus, Dendrites, Fear, gamma-Aminobutyric Acid, Glutamine, Male, Microscopy, Electron, Neuronal Plasticity, Neurons, Synapses, Immunoblotting, Rats, Sprague-Dawley, Receptors, Mineralocorticoid, Dendritic Spines, Rats

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