Cited by 97Neuroscience and Neuropharmacology ResearchMemory and Neural MechanismsStress Responses and Cortisol

Corticotrophin‐releasing factor produces a long‐lasting enhancement of synaptic efficacy in the hippocampus

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Wang, H. L., Wayner, M. J., Chai, C. Y., Lee, E. H. Y.·1998·European Journal of Neuroscience

Abstract

We have previously demonstrated that intra-hippocampal injection of corticotrophin-releasing factor improved memory retention of an inhibitory avoidance learning in rats; while the electrophysiological effects corticotrophin-releasing factor produces on hippocampal neurons are largely uncharacterized. In the present study, we found that corticotrophin-releasing factor injected into the dentate gyrus of hippocampus produced a dose-dependent and long-lasting enhancement in synaptic efficacy of these neurons, as measured by an increase in the amplitude and slope of population excitatory postsynaptic potentials, as well as the amplitude of population spike. The onset of corticotrophin-releasing factor-induced potentiation was slow. It was observed approximately 40-60 min after corticotrophin-releasing factor administration and lasted for more than 5 h. This effect of corticotrophin-releasing factor was blocked by pretreatment with the cyclase-adenosine-3,5-monophosphate (cAMP) inhibitor Rp-adenosine-3,5-cyclic monophosphothiolate triethylamine (Rp-cAMPS) and partially blocked by the N-methyl-D-aspartate receptor antagonist MK-801. Further, pretreatment with corticotrophin-releasing factor receptor antagonist dose-dependently diminished tetanization-induced long-term potentiation, and corticotrophin-releasing factor and tetanic stimuli had an additive effect on hippocampal neuron excitation. Moreover, direct injection of corticotrophin-releasing factor increased cAMP level in the dentate gyrus. These results together suggest that corticotrophin-releasing factor-induced potentiation simulates the late phase of tetanization-induced long-term potentiation and cAMP seems to be the messenger mediating this effect. Moreover, corticotrophin-releasing factor-induced potentiation and long-term potentiation may share some similar mechanisms, and corticotrophin-releasing factor is probably involved in the neural circuits underlying long-term potentiation. Thus, corticotrophin-releasing factor may play an important role in modulating synaptic plasticity in the hippocampus.

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Crossref · 10.1046/j.1460-9568.1998.00352.x

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Authors
Wang, H. L., Wayner, M. J., Chai, C. Y., & Lee, E. H. Y.
Affiliations
  • National Defense Medical Center (TW)
  • The University of Texas at San Antonio (US)
  • Institute of Biomedical Sciences, Academia Sinica (TW)
Corresponding author
Lee, E. H. Y.
Venue
European Journal of Neuroscience
Publisher
Wiley
Published
1998-11
Volume
10
Issue
11
Pages
3428-3437
ISSN
  • 0953-816X (ISSN-L)
  • 1460-9568
OpenAlex
W2073697680
Cited by
97
References
38
Citations by year
2024: 1 · 2022: 2 · 2021: 1 · 2020: 3 · 2018: 2 · 2017: 1 · 2016: 1 · 2014: 4 · 2013: 4 · 2012: 5
FWCI
1.32
Type
journal article
Language
en
Open access
Locations
  • European Journal of Neuroscience (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Science Council
  • Academia Sinica
  • Institute of Biomedical Sciences, Academia Sinica
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
  • Life Sciences › Neuroscience › Behavioral Neuroscience › Stress Responses and Cortisol
Keywords
corticotropin-releasing factor, hippocampus, dentate gyrus, synaptic potentiation, long-term potentiation, cAMP signaling, NMDA receptor, synaptic plasticity, excitatory postsynaptic potentials, memory consolidation, passive avoidance
MeSH terms
Action Potentials, Cyclic AMP, Animals, Corticotropin-Releasing Hormone, Hippocampus, Male, Neurons, Receptors, N-Methyl-D-Aspartate, Rats, Sprague-Dawley, Long-Term Potentiation, Dentate Gyrus, Rats

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