Cited by 310Neuroscience and Neuropharmacology ResearchMemory and Neural MechanismsNeural dynamics and brain function

Noradrenergic enhancement of long-term potentiation at mossy fiber synapses in the hippocampus

Hopkins, W. F., Johnston, D.·1988·Journal of Neurophysiology

Abstract

1. We tested several hypotheses related to the modulation of long-term potentiation (LTP) by norepinephrine (NE) at the mossy fiber synapses in the rat hippocampal slice preparation using extracellular and intracellular recording techniques. 2. NE exerted frequency-dependent effects on mossy fiber synaptic transmission. It had little effect on extracellular population excitatory postsynaptic potentials (pEPSPs) sampled during low-frequency stimulation, whereas it had marked effects on the duration, magnitude, and probability of induction of LTP at these synapses. 3. The beta-adrenoceptor agonist isoproterenol mimicked all of the effects of NE, whereas the beta-adrenoceptor antagonists propranolol and timolol reversibly blocked the induction of LTP, suggesting the effects of NE are mediated by a beta-adrenoceptor and that beta-adrenoceptor activation may be an important constituent for the expression of LTP at these synapses. 4. Frequency-dependent effects of NE and isoproterenol on mossy fiber pEPSPs were also observed in the presence of the gamma-aminobutyric acid (GABA) antagonist, picrotoxin, suggesting that NE can enhance LTP by a mechanism that does not depend on intact inhibition. However, propranolol did not block LTP in these disinhibited slices and did not affect LTP magnitude. 5. The adenylate cyclase activator forskolin augmented pEPSPs sampled during low-frequency stimulation in disinhibited slices and significantly enhanced LTP. Forskolin, however, did not produc…

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Crossref · 10.1152/jn.1988.59.2.667

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Authors
Hopkins, W. F., & Johnston, D.
Affiliations
Baylor College of Medicine (US)
Venue
Journal of Neurophysiology
Published
1988-02-01
Volume
59
Issue
2
Pages
667-687
ISSN
  • 0022-3077 (ISSN-L)
  • 1522-1598
OpenAlex
W2403704540
Cited by
310
References
0
Citations by year
2025: 1 · 2024: 2 · 2023: 2 · 2022: 5 · 2021: 5 · 2020: 1 · 2019: 3 · 2018: 4 · 2016: 4 · 2015: 4 · 2014: 8 · 2012: 7
FWCI
5.37
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Neurophysiology (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • National Heart, Lung, and Blood Institute (HL-31164)
  • National Institute of Neurological Disorders and Stroke (NS-11535, NS-15772)
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
norepinephrine, long-term potentiation, mossy fiber synapses, hippocampus, beta-adrenergic receptors, isoproterenol, propranolol, timolol, cyclic AMP, forskolin, 8-bromo-cAMP, synaptic transmission, GABAergic inhibition, tetanic stimulation, synaptic plasticity
MeSH terms
Animals, Colforsin, Hippocampus, Isoproterenol, Male, Nerve Fibers, Neural Inhibition, Norepinephrine, Picrotoxin, Rats, Inbred Strains, Receptors, Adrenergic, beta, Synapses, Time Factors, 8-Bromo Cyclic Adenosine Monophosphate, Rats

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