The DOI matches its Crossref record; 40 of the 43 references it cites were found in a registry or an index.
Dopaminergic antagonists prevent long-term maintenance of posttetanic LTP in the CA1 region of rat hippocampal slices
Abstract
The involvement of dopaminergic mechanisms in the induction and maintenance of posttetanic long-term potentiation (LTP) was investigated on CA1 cells of rat hippocampal slices. The presence of the dopamine receptor blocker domperidone in a concentration of 1 microM during tetanization with 3 trains of 100 impulses (100 Hz) and a train interval of 10 min influences neither the synaptic transmission nor the induction of LTP. However, the potentiation of both the population spike and the population EPSP gradually decreases, thus significantly differing from control LTP about 4 h after initiation and reaching the level of non-tetanized controls about 7-8 h after tetanization. The simultaneous presence of 1 microM apomorphine during tetanization abolishes this effect of domperidone indicating the specific dopaminolytic nature of its action. Also the presence of the dopamine antagonists sulpiride and flupenthixol, respectively, in a concentration of 1 microM during tetanization likewise prevents the occurrence of the late LTP maintenance. The determination of [14C]dopamine in 2 min fractions from the superfused slices after preloading during a preincubation period revealed that a low frequency stimulation of the Schaffer collaterals with 0.33 Hz does not influence the spontaneous efflux of dopamine, whereas the tetanization with an impulse train of 100 Hz produces a significantly enhanced release. The observations suggest that dopaminergic influences during and immediately after tetanization at least additionally contribute to the induction of postsynaptic mechanisms subserving a late, long-lasting maintenance of potentiation. The results also support the assumed existence of different subsequent stages of LTP.
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“studies of LTP (mostly in CA1) show that there is an additional factor: the persistence of LTP depends not just on the two factors of the Hebbian condition (glutamate release and postsynaptic depolarization), but also on a third, the action of the neurotransmitter dopamine [7]”
From A neoHebbian framework for episodic memory; role of dopamine-dependent late LTP (2011) · cites this paper as [7]
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Metadata
- Authors
- Frey, U., Schroeder, H., & Matthies, H.
- Affiliations
- Leibniz Institute for Neurobiology (DE)
- Corresponding author
- Frey, Uwe
- Venue
- Brain Research
- Publisher
- Elsevier BV
- Published
- 1990-07
- Volume
- 522
- Issue
- 1
- Pages
- 69-75
- ISSN
- 0006-8993 (ISSN-L)
- OpenAlex
- W2021485981
- Cited by
- 333
- References
- 43
- Citations by year
- 2026: 2 · 2025: 5 · 2024: 13 · 2023: 3 · 2022: 11 · 2021: 7 · 2020: 5 · 2019: 6 · 2018: 24 · 2017: 10 · 2016: 10 · 2015: 9 · 2014: 18 · 2013: 12 · 2012: 18
- FWCI
- 1.70
- Type
- journal article
- Language
- en
- Open access
- closed
- Locations
- Brain Research (publishedVersion)
- PubMed (publishedVersion)
- Topics
- Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
- Life Sciences › Neuroscience › Cognitive Neuroscience › Memory and Neural Mechanisms
- Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurotransmitter Receptor Influence on Behavior
- Keywords
- long-term potentiation, post-tetanic potentiation, dopamine antagonists, hippocampal CA1, domperidone, apomorphine, sulpiride, flupenthixol, dopamine release, synaptic transmission, LTP maintenance, Schaffer collaterals, postsynaptic mechanisms
- MeSH terms
- Animals, Apomorphine, Domperidone, Dopamine, Electric Stimulation, Flupenthixol, Hippocampus, Nerve Tissue Proteins, Synaptic Transmission, Sulpiride, Synapses, Dopamine Agents, Dopamine Antagonists, Rats, In Vitro Techniques
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