Cited by 73Neuroscience and Neuropharmacology ResearchAmino Acid Enzymes and MetabolismNeuroinflammation and Neurodegeneration Mechanisms

State‐dependent changes in astrocyte regulation of extrasynaptic NMDA receptor signalling in neurosecretory neurons

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Fleming, Tiffany M., Scott, Victoria, Naskar, Krishna, Joe, Natalie, Brown, Colin H., Stern, Javier E.·2011·The Journal of Physiology

Abstract

Non‐technical summary Glutamate is a critical excitatory neurotransmitter in the modulation of hypothalamic neuronal activity and neurosecretion from the posterior pituitary. Still, the precise mechanisms and modalities by which it acts remain to be fully elucidated. We show that in addition to mediating conventional fast synaptic transmission, glutamate persistently activates extrasynaptic NMDA receptors, providing a tonic excitatory drive to hypothalamic neurosecretory neurons. We also show that this tonic excitatory modality is influenced by the neighbouring astrocytes, and is enhanced in dehydrated rats. Knowledge on alternative modalities by which glutamate influences hypothalamic neuronal function increases our understanding of general brain mechanisms regulating neurosecretion and bodily homeostasis.

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Crossref · 10.1113/jphysiol.2011.207340

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  1. Tasker JG, Di S, Boudaba C. Functional synaptic plasticity in hypothalamic magnocellular neurons. Prog Brain Res. 2002;139:113–119. doi: 10.1016/s0079-6123(02)39011-3. [DOI] [PubMed] [Google Scholar] · DOI

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Authors
Fleming, T. M., Scott, V., Naskar, K., Joe, N., Brown, C. H., & Stern, J. E.
Affiliations
  • Augusta University (US)
  • University of Otago (NZ)
Venue
The Journal of Physiology
Publisher
Wiley
Published
2011-08
Volume
589
Issue
16
Pages
3929-3941
ISSN
  • 0022-3751 (ISSN-L)
  • 1469-7793
OpenAlex
W2116787223
Cited by
73
References
65
Citations by year
2026: 3 · 2025: 3 · 2024: 3 · 2023: 2 · 2022: 2 · 2021: 5 · 2020: 6 · 2019: 3 · 2018: 2 · 2017: 9 · 2016: 5 · 2015: 5 · 2014: 11 · 2013: 6 · 2012: 5
FWCI
3.31
Type
journal article
Language
en
Open access
Locations
  • The Journal of Physiology (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • University of Otago
  • National Institutes of Health
  • National Heart, Lung, and Blood Institute (R01HL085767)
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Biochemistry › Amino Acid Enzymes and Metabolism
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
Keywords
extrasynaptic NMDA receptors, astrocytes, neurosecretory cells, supraoptic nucleus, hypothalamus, alpha-aminoadipic acid, dehydration, glutamate signalling, neuronal homeostasis
MeSH terms
Animals, Astrocytes, Female, Male, Neurons, Neurosecretory Systems, Organ Culture Techniques, Supraoptic Nucleus, Synapses, Signal Transduction, Receptors, N-Methyl-D-Aspartate, Rats, Wistar, Rats, Synaptic Potentials

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