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Serotonin produces long-term changes in the excitability of Aplysia sensory neurons in culture that depend on new protein synthesis

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Dale, N, Kandel, ER, Schacher, S·1987·The Journal of Neuroscience

Abstract

When isolated and grown in cell culture, the sensory and motor neurons of the gill withdrawal reflex of Aplysia readily form synaptic connections. Repeated exposures to 5-HT cause facilitation of the synaptic connections between co-cultured sensory and motor neurons lasting at least 24 hr. As a first step toward understanding the locus and the mechanisms underlying this long-term synaptic facilitation, we have examined the membrane excitability of the isolated presynaptic sensory neurons grown alone in dissociated cell culture. Four repeated applications of 1 microM 5-HT caused a significant increase in the excitability of sensory neurons, lasting at least 24 hr. This resembles the short-term changes in excitability seen in response to a single application of 5-HT. Unlike the short-term effect, this long-lasting change was blocked by exposure of the cells during the 5-HT treatment to 10 microM anisomycin, an inhibitor of protein synthesis. Thus, like the synaptic facilitation, the long-term change in excitability of the isolated presynaptic neurons differs from the short-term in requiring the synthesis of new protein. This finding suggests that the sensory neuron uses gene products to modulate membrane currents in its long- term response to repeated external stimuli that are not required in its short-term response to a single stimulus.

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Crossref · 10.1523/jneurosci.07-07-02232.1987

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  • Learning and long-term memory formation are improved by enhanced histone acetylation, which could be improved by HDAC inhibitors.

    “The synthesis of new proteins is necessary for long-term changes in synaptic plasticity and learning (132–134). In this context, learning and long-term memory formation are improved by enhanced histone acetylation (135), which could be improved by HDAC inhibitors (HDACi).”

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Authors
Dale, N., Kandel, E., & Schacher, S.
Affiliations
Howard Hughes Medical Institute (US)
Venue
The Journal of Neuroscience
Published
1987-07-01
Volume
7
Issue
7
Pages
2232-2238
ISSN
  • 0270-6474 (ISSN-L)
  • 1529-2401
OpenAlex
W1625157937
Cited by
118
References
9
Citations by year
2026: 1 · 2024: 1 · 2023: 2 · 2022: 1 · 2021: 1 · 2020: 1 · 2019: 1 · 2018: 1 · 2017: 1 · 2016: 1 · 2014: 5 · 2013: 2 · 2012: 2
FWCI
3.06
Type
journal article
Language
en
Open access
Locations
  • Journal of Neuroscience (publishedVersion, cc-by-nc-sa)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (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 › Neurobiology and Insect Physiology Research
Keywords
serotonin, sensory neuron excitability, Aplysia, gill-withdrawal reflex, synaptic facilitation, long-term synaptic plasticity, anisomycin, presynaptic neurons, membrane currents, sensory-motor synapses
MeSH terms
Action Potentials, Animals, Anisomycin, Aplysia, Cells, Cultured, Gills, Nerve Tissue Proteins, Neurons, Afferent, Serotonin

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