Cited by 1,708Neuroscience and Neuropharmacology ResearchMemory and Neural MechanismsNeural dynamics and brain function

Homosynaptic long-term depression in area CA1 of hippocampus and effects of N-methyl-D-aspartate receptor blockade.

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Dudek, S M, Bear, M F·1992·Proceedings of the National Academy of Sciences

Abstract

We tested a theoretical prediction that patterns of excitatory input activity that consistently fail to activate target neurons sufficiently to induce synaptic potentiation will instead cause a specific synaptic depression. To realize this situation experimentally, the Schaffer collateral projection to area CA1 in rat hippocampal slices was stimulated electrically at frequencies ranging from 0.5 to 50 Hz. Nine hundred pulses at 1-3 Hz consistently yielded a depression of the CA1 population excitatory postsynaptic potential that persisted without signs of recovery for greater than 1 hr after cessation of the conditioning stimulation. This long-term depression was specific to the conditioned input, ruling out generalized changes in postsynaptic responsiveness or excitability. Three lines of evidence suggest that this effect is accounted for by a modification of synaptic effectiveness rather than damage to or fatigue of the stimulated inputs. First, the effect was dependent on the stimulation frequency; 900 pulses at 10 Hz caused no lasting change, and at 50 Hz a synaptic potentiation was usually observed. Second, the depressed synapses continued to support long-term potentiation in response to a high-frequency tetanus. Third, the effects of conditioning stimulation could be prevented by application of NMDA receptor antagonists. Thus, our data suggest that synaptic depression can be triggered by prolonged NMDA receptor activation that is below the threshold for inducing synaptic potentiation. We propose that this mechanism is important for the modifications of hippocampal response properties that underlie some forms of learning and memory.

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Crossref · 10.1073/pnas.89.10.4363

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  1. Gold R., Kappos L. Faziale Myokymie durch pontine Läsionen und zentrales Fieber bei multipler Sklerose--Kasuistik. Schweiz Rundsch Med Prax. 1991 Nov 19;80(47):1327–1329. [PubMed] [Google Scholar]

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Authors
Dudek, S. M., & Bear, M. F.
Affiliations
Brown University (US)
Venue
Proceedings of the National Academy of Sciences
Published
1992-05-15
Volume
89
Issue
10
Pages
4363-4367
ISSN
  • 0027-8424 (ISSN-L)
  • 1091-6490
OpenAlex
W2061405268
Cited by
1,708
References
25
Citations by year
2026: 20 · 2025: 39 · 2024: 57 · 2023: 35 · 2022: 47 · 2021: 53 · 2020: 37 · 2019: 47 · 2018: 60 · 2017: 57 · 2016: 55 · 2015: 61 · 2014: 57 · 2013: 66 · 2012: 55
FWCI
16.57
Type
journal article
Language
en
Open access
Locations
  • Proceedings of the National Academy of Sciences (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
Funders
Office of Naval Research
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Neural dynamics and brain function
Keywords
hippocampus, NMDA receptor antagonism, Schaffer collaterals, excitatory postsynaptic potentials, synaptic potentiation, stimulation frequency, long-term potentiation, synaptic plasticity, learning and memory
MeSH terms
Animals, Electric Stimulation, Evoked Potentials, Hippocampus, Male, Pyramidal Tracts, Rats, Inbred Strains, Cortical Spreading Depression, Synapses, 2-Amino-5-phosphonovalerate, Receptors, N-Methyl-D-Aspartate, Rats, In Vitro Techniques

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