Cited by 215Neuroscience and Neuropharmacology ResearchNeuropeptides and Animal PhysiologyNeurotransmitter Receptor Influence on Behavior

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5-HT3Receptors Mediate Serotonergic Fast Synaptic Excitation of Neocortical Vasoactive Intestinal Peptide/Cholecystokinin Interneurons

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Férézou, Isabelle, Cauli, Bruno, Hill, Elisa L., Rossier, Jean, Hamel, Edith, Lambolez, Bertrand·2002·The Journal of Neuroscience

Abstract

Neocortical neurons expressing the serotonin 5-HT3 receptor (5-HT3R) were characterized in rat acute slices by using patch-clamp recordings combined with single-cell RT-PCR and histochemical labeling. The 5-HT3A receptor subunit was expressed selectively in a subset of GABAergic interneurons coexpressing cholecystokinin (CCK) and vasoactive intestinal peptide (VIP). The 5-HT3B subunit was never detected, indicating that 5-HT3Rs expressed by neocortical interneurons did not contain this subunit. In 5-HT3A-expressing VIP/CCK interneurons, serotonin induced fast membrane potential depolarizations by activating an inward current that was blocked by the selective 5-HT3R antagonist tropisetron. Furthermore, we observed close appositions between serotonergic fibers and the dendrites and somata of 5-HT3R-expressing neurons, suggestive of possible synaptic contacts. Indeed, in interneurons exhibiting rapid excitation by serotonin, local electrical stimulations evoked fast EPSCs of large amplitude that were blocked by tropisetron. Finally, 5-HT3R-expressing neurons were also excited by a nicotinic agonist, indicating that serotonergic and cholinergic fast synaptic transmission could converge onto VIP/CCK interneurons. Our results establish a clear correlation between the presence of the 5-HT3A receptor subunit in neocortical VIP/CCK GABAergic interneurons, its functional expression, and its synaptic activation by serotonergic afferent fibers from the brainstem raphe nuclei.

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Crossref · 10.1523/jneurosci.22-17-07389.2002

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Metadata

Authors
Férézou, I., Cauli, B., Hill, E. L., Rossier, J., Hamel, E., & Lambolez, B.
Affiliations
Centre National de la Recherche Scientifique (FR)
Venue
The Journal of Neuroscience
Published
2002-09-01
Volume
22
Issue
17
Pages
7389-7397
ISSN
  • 0270-6474 (ISSN-L)
  • 1529-2401
OpenAlex
W2137514318
Cited by
215
References
70
Citations by year
2026: 3 · 2025: 5 · 2024: 8 · 2023: 4 · 2022: 9 · 2021: 11 · 2020: 8 · 2019: 7 · 2018: 8 · 2017: 10 · 2016: 9 · 2015: 10 · 2014: 14 · 2013: 9 · 2012: 11
FWCI
2.79
Type
journal article
Language
en
Open access
Locations
  • Journal of Neuroscience (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • HAL (submittedVersion)
Funders
  • European Commission
  • Centre National de la Recherche Scientifique
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuropeptides and Animal Physiology
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neurotransmitter Receptor Influence on Behavior
Keywords
5-HT3 receptor, serotonin, vasoactive intestinal peptide, cholecystokinin, GABAergic interneurons, neocortex, excitatory postsynaptic currents, tropisetron, nicotinic acetylcholine receptors, raphe nuclei, serotonergic afferents
MeSH terms
Animals, Cholecystokinin, gamma-Aminobutyric Acid, Interneurons, Membrane Potentials, Synaptic Transmission, Neurons, Afferent, Receptors, Serotonin, Serotonin, Serotonin Antagonists, Vasoactive Intestinal Peptide, Rats, Wistar, Patch-Clamp Techniques, Nicotinic Agonists, Neocortex, Excitatory Postsynaptic Potentials, Reverse Transcriptase Polymerase Chain Reaction, Protein Subunits, Receptors, Serotonin, 5-HT3, Rats, In Vitro Techniques

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