Cited by 130Nicotinic Acetylcholine Receptors StudyNeuroscience and Neuropharmacology ResearchIon channel regulation and function

Two Types of Nicotinic Receptors Mediate an Excitation of Neocortical Layer I Interneurons

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Christophe, Elodie, Roebuck, Aline, Staiger, Jochen F., Lavery, Daniel J., Charpak, Serge, Audinat, Etienne·2002·Journal of Neurophysiology

Abstract

Nicotinic acetylcholine receptors are widely expressed in the neocortex but their functional roles remain largely unknown. Here we investigated the effect of nicotinic receptor activation on interneurons of layer I, which contains a high density of cholinergic fiber terminals. Ninety-seven of 101 neurons recorded in whole cell configuration in rat acute slices were excited by local pressure application of nicotinic agonists, acetylcholine (500 μM), 1,1-dimethyl-4-phenyl-piperazinium (500 μM) or choline (10 mM). Biocytin labeling confirmed that our sample included different morphological types of layer I interneurons. The responses to nicotinic agonists persisted in presence of glutamate and muscarinic receptor antagonists and on further addition of Cd 2+or tetrodotoxin, indicating that they were mediated by direct activation of postsynaptic nicotinic receptors. The kinetics of the currents and their sensitivity to nicotinic receptor antagonists, methyllycaconitine (1–10 nM) or dihydro-β-erythroidine (500 nM), suggested that early and late components of the responses were mediated by α7 and non-α7 types of receptors. Both components had inwardly rectifying I-V curves, which differed when intracellular spermine was omitted. Single-cell RT-PCR experiments identified α4, α7, and β2 as the predominantly expressed mRNAs, suggesting that the receptors consisted of α7 homomers and α4β2 heteromers. Finally, selective excitation of layer I interneurons through activation of their nicotinic receptors resulted in a tetrodotoxin-sensitive increase of inhibitory synaptic currents recorded in nonpyramidal cells but not in pyramidal cells of layer II/III. These results suggest that acetylcholine released in layer I may induce a disinhibition of the cortical network through activation of nicotinic receptors expressed by layer I interneurons.

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Crossref · 10.1152/jn.2002.88.3.1318

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  • The relative influence of external input can be enhanced by cholinergic depolarization of selective sets of inhibitory interneurons, coupled with cholinergic suppression of evoked GABAergic synaptic transmission.

    “The relative influence of external input can also be enhanced by cholinergic depolarization of selective sets of inhibitory interneurons (Xiang et al., 1998; McQuiston and Madison, 1999a, b, c; Christophe et al., 2002), coupled with the cholinergic suppression of evoked GABAergic synaptic transmission (Pitler and Alger, 1992; Behrends and ten Bruggencate, 1993; Patil and Hasselmo, 1999).”

    From Modes and models of forebrain cholinergic neuromodulation of cognition (2011) · cites this paper as Christophe et al., 2002

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Authors
Christophe, E., Roebuck, A., Staiger, J. F., Lavery, D. J., Charpak, S., & Audinat, E.
Affiliations
  • Inserm (FR)
  • GlaxoSmithKline (Switzerland) (CH)
  • Heinrich Heine University Düsseldorf (DE)
  • Laboratoire de Neurophysiologie, Institut National de la Santé et de la Recherche Médicale EPI 0002, ESPCI, 75231 Paris Cedex 5, France;
Venue
Journal of Neurophysiology
Published
2002-09-01
Volume
88
Issue
3
Pages
1318-1327
ISSN
  • 0022-3077 (ISSN-L)
  • 1522-1598
OpenAlex
W1840472544
Cited by
130
References
50
Citations by year
2026: 2 · 2025: 2 · 2024: 2 · 2023: 2 · 2022: 1 · 2021: 4 · 2020: 4 · 2019: 3 · 2018: 6 · 2017: 4 · 2016: 7 · 2015: 9 · 2014: 17 · 2013: 11 · 2012: 11
FWCI
1.62
Type
journal article
Language
en
Open access
Locations
  • Journal of Neurophysiology (publishedVersion)
  • PubMed (publishedVersion)
Funders
  • École Supérieure de Physique et de Chimie Industrielles de la Ville de Paris
  • Centre National de la Recherche Scientifique
Topics
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Nicotinic Acetylcholine Receptors Study
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ion channel regulation and function
Keywords
nicotinic acetylcholine receptors, acetylcholine, alpha7 nicotinic acetylcholine receptor, alpha4beta2 nicotinic receptor, cholinergic interneurons, disinhibition, methyllycaconitine, dihydro-beta-erythroidine, choline
MeSH terms
Animals, Electrophysiology, Interneurons, Receptors, Nicotinic, RNA, Messenger, Synapses, Rats, Wistar, Nicotinic Agonists, Neocortex, Rats, alpha7 Nicotinic Acetylcholine Receptor, In Vitro Techniques

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