Cited by 166Neuroscience and Neuropharmacology ResearchAmino Acid Enzymes and MetabolismIon channel regulation and function

Calcium-dependent inactivation of synaptic NMDA receptors in hippocampal neurons

Rosenmund, C., Feltz, A., Westbrook, G. L.·1995·Journal of Neurophysiology

Abstract

1. We examined whether synaptically activated N-methyl-D-aspartate (NMDA) receptors are regulated by intracellular calcium in cultured hippocampal neurons by comparing excitatory postsynaptic currents (EPSCs) to the previously described calcium-dependent regulation of whole cell NMDA currents. Standard whole cell recording and fast application methods were used. 2. Low-frequency (0.2 Hz) stimulation of EPSCs in the presence of 2-amino-5-phosphonovalerate (AP5) evoked a constant amplitude alpha-amino-3-hydroxy-5-methyl-4-isoxazolepropionic acid (AMPA) receptor-mediated EPSC. On removal of AP5 in Ca(2+)-containing solutions, the amplitude of the slow NMDA receptor-mediated EPSC decreased by approximately 50% during the next 10 stimuli. The decrease in the EPSC was dependent on the extracellular calcium concentration and stimulus frequency, consistent with Ca(2+)-dependent desensitization/inactivation of postsynaptic NMDA receptors. A whole cell prepulse of NMDA (10 microM, 10 s) in Ca(2+)-containing solutions inhibited the slow EPSC to a similar degree. A series of slow EPSCs also produced Ca(2+)-dependent inactivation of whole cell NMDA currents evoked in low calcium solutions. 3. These results demonstrate that synaptic NMDA receptors are inactivated by intracellular calcium and that calcium entry through synaptically activated NMDA receptors is sufficient to provide feedback inhibition of the slow EPSC.

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Crossref · 10.1152/jn.1995.73.1.427

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Authors
Rosenmund, C., Feltz, A., & Westbrook, G. L.
Affiliations
Oregon Health & Science University (US)
Venue
Journal of Neurophysiology
Published
1995-01-01
Volume
73
Issue
1
Pages
427-430
ISSN
  • 0022-3077 (ISSN-L)
  • 1522-1598
OpenAlex
W1944475919
Cited by
166
References
0
Citations by year
2026: 3 · 2025: 1 · 2023: 2 · 2022: 1 · 2021: 2 · 2020: 3 · 2019: 2 · 2018: 8 · 2017: 4 · 2016: 3 · 2015: 5 · 2014: 5 · 2013: 2 · 2012: 6
FWCI
4.27
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Neurophysiology (publishedVersion)
  • PubMed (publishedVersion)
Funders
National Institute of Mental Health (MH-46613)
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 › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ion channel regulation and function
Keywords
NMDA receptor, hippocampal neurons, excitatory postsynaptic currents, calcium influx, product inhibition, AMPA receptors, stimulus frequency dependence
MeSH terms
Animals, Calcium, Evoked Potentials, Hippocampus, Synaptic Transmission, Neurons, Receptors, N-Methyl-D-Aspartate, N-Methylaspartate, Rats, Sprague-Dawley, Rats

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