Cited by 194Neuroscience and Neuropharmacology ResearchNicotinic Acetylcholine Receptors StudyIon channel regulation and function

Heterogeneity of phasic cholinergic signaling in neocortical neurons

Gulledge, Allan T., Park, Susanna B., Kawaguchi, Yasuo, Stuart, Greg J.·2007·Journal of Neurophysiology

Abstract

Acetylcholine (ACh) is a neurotransmitter critical for normal cognition. Here we demonstrate heterogeneity of cholinergic signaling in neocortical neurons in the rat prefrontal, somatosensory, and visual cortex. Focal ACh application (100 muM) inhibited layer 5 pyramidal neurons in all cortical areas via activation of an apamin-sensitive SK-type calcium-activated potassium conductance. Cholinergic inhibition was most robust in prefrontal layer 5 neurons, where it relies on the same signal transduction mechanism (M1-like receptors, IP(3)-dependent calcium release, and SK-channels) as exists in somatosensory pyramidal neurons. Pyramidal neurons in layer 2/3 were less responsive to ACh, but substantial apamin-sensitive inhibitory responses occurred in deep layer 3 neurons of the visual cortex. ACh was only inhibitory when presented near the somata of layer 5 pyramidal neurons, where repetitive ACh applications generated discrete inhibitory events at frequencies of up to approximately 0.5 Hz. Fast-spiking (FS) nonpyramidal neurons in all cortical areas were unresponsive to ACh. When applied to non-FS interneurons in layers 2/3 and 5, ACh generated mecamylamine-sensitive nicotinic responses (38% of cells), apamin-insensitive hyperpolarizing responses, with or without initial nicotinic depolarization (7% of neurons), or no response at all (55% of cells). Responses in interneurons were similar across cortical layers and regions but were correlated with cellular physiology and the expression of biochemical markers associated with different classes of nonpyramidal neurons. Finally, ACh generated nicotinic responses in all layer 1 neurons tested. These data demonstrate that phasic cholinergic input can directly inhibit projection neurons throughout the cortex while sculpting intracortical processing, especially in superficial layers.

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Crossref · 10.1152/jn.00493.2006

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  • The slow depolarization is mediated by M1 muscarinic receptor-mediated closure of M-type (KCNQ) potassium channels in pyramidal neurons enhancing their excitability and reducing their spike frequency adaptation.

    “The slow depolarization is mediated by M1 mAChR-mediated closure of M-type (KCNQ) potassium channels in pyramidal neurons (Delmas and Brown, 2005) enhancing their excitability and reducing their spike frequency adaptation (Gulledge et al., 2007; Hasselmo and Giocomo, 2006).”
  • Activation of M1 muscarinic acetylcholine receptors hyperpolarizes pyramidal neurons via a mechanism dependent on fully-loaded internal calcium stores that occurs more quickly than the closure of M-type potassium channels.

    “Furthermore, activation of M1 mAChRs hyperpolarizes pyramidal neurons via a mechanism dependent on fully-loaded internal calcium stores that occurs more quickly than the closure of M-type potassium channels (Gulledge et al., 2007; Gulledge and Stuart, 2005).”

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Authors
Gulledge, A. T., Park, S. B., Kawaguchi, Y., & Stuart, G. J.
Affiliations
National Institute for Physiological Sciences (JP)
Venue
Journal of Neurophysiology
Published
2007-03
Volume
97
Issue
3
Pages
2215-2229
ISSN
  • 0022-3077 (ISSN-L)
  • 1522-1598
OpenAlex
W2015061703
Cited by
194
References
40
Citations by year
2026: 3 · 2025: 2 · 2024: 7 · 2023: 6 · 2022: 6 · 2021: 7 · 2020: 7 · 2019: 10 · 2018: 15 · 2017: 11 · 2016: 14 · 2015: 12 · 2014: 14 · 2013: 18 · 2012: 15
FWCI
3.40
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Neurophysiology (publishedVersion)
  • PubMed (publishedVersion)
  • ANU Open Research (Australian National University) (submittedVersion)
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Nicotinic Acetylcholine Receptors Study
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ion channel regulation and function
Keywords
acetylcholine, neocortical neurons, layer 5 pyramidal neurons, small conductance calcium-activated potassium channels, M1 muscarinic receptor, nicotinic acetylcholine receptors, fast-spiking interneurons, non-pyramidal neurons, prefrontal cortex, somatosensory cortex, visual cortex, cortical inhibition
MeSH terms
Acetylcholine, Analysis of Variance, Animals, Apamin, Calcium, Chelating Agents, Diamines, Dose-Response Relationship, Radiation, Egtazic Acid, Electric Stimulation, Membrane Potentials, Neural Inhibition, Neurons, Signal Transduction, Patch-Clamp Techniques, Cholinergic Agents, Neocortex, Rats, In Vitro Techniques

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