Cited by 65Neuroscience and Neuropharmacology ResearchNeural dynamics and brain functionIon channel regulation and function

The contribution of synaptic location to inhibitory gain control in pyramidal cells

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Pouille, Frederic, Watkinson, Oliver, Scanziani, Massimo, Trevelyan, Andrew J.·2013·Physiological Reports

Abstract

THE ACTIVITY OF PYRAMIDAL CELLS IS CONTROLLED BY TWO OPPOSING FORCES: synaptic inhibition and synaptic excitation. Interestingly, these synaptic inputs are not distributed evenly across the dendritic trees of cortical pyramidal cells. Excitatory synapses are densely packed along only the more peripheral dendrites, but are absent from the proximal stems and the soma. In contrast, inhibitory synapses are located throughout the dendritic tree, the soma, and the axon initial segment. Thus both excitatory and inhibitory inputs exist on the peripheral dendritic tree, while the proximal segments only receive inhibition. The functional consequences of this uneven organization remain unclear. We used both optogenetics and dynamic patch clamp techniques to simulate excitatory synaptic conductances in pyramidal cells, and then assessed how their firing output is modulated by gamma-amino-butyric acid type A (GABAA) receptor activation at different regions of the somatodendritic axis. We report here that activation of GABAA receptor on the same dendritic compartment as excitatory inputs causes a rightwards shift in the function relating firing rate to excitatory conductance (the input-output function). In contrast, GABAA receptor activation proximal to the soma causes both a rightwards shift and also a reduction in the maximal firing rate. The experimental data are well reproduced in a simple, four compartmental model of a neuron with inhibition either on the same compartment, or proximal, to the excitatory drive.

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Crossref · 10.1002/phy2.67

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  • Proximal inhibition alters the electrotonic properties (shunting) of the path between the excitatory conductance input and the axon initial segment output, increasing threshold and decreasing the maximal firing rate for a given excitatory conductance input.

    “however, proximal inhibition alters the electrotonic properties (i.e., shunting) of the path between the excitatory conductance input and the axon initial segment output to both increase threshold and decrease the maximal firing rate for a given excitatory conductance input.”

    From Hippocampal GABAergic Inhibitory Interneurons (2017) · cites this paper as [924]

  • When inhibition and excitation arrived at the same dendritic compartment, inhibition caused a rightward shift in the firing rate function related to excitatory conductance.

    “Of interest, they observed that when inhibition and excitation arrived at the same dendritic compartment, inhibition caused a rightward shift in the firing rate function related to excitatory conductance (FIGURE 19).”

    From Hippocampal GABAergic Inhibitory Interneurons (2017) · cites this paper as [924]

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Research works printed but not linked: 1

  1. Fairen A DeFelipe J Regidor J Peters A Jones EG Nonpyramidal neurons: general account Cerebral cortex 1984 London, U.K Plenum Press 201 253

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Authors
Pouille, F., Watkinson, O., Scanziani, M., & Trevelyan, A. J.
Affiliations
  • Howard Hughes Medical Institute; University of California San Diego; La Jolla 92093-0634 California
  • Royal Papworth Hospital (GB)
  • Howard Hughes Medical Institute (US)
  • Newcastle University (GB)
Corresponding author
Trevelyan, Andrew J.
Venue
Physiological Reports
Publisher
Wiley
Published
2013-09-23
Volume
1
Issue
5
Pages
e00067-e00067
ISSN
2051-817X (ISSN-L)
OpenAlex
W2158955562
Cited by
65
References
26
Citations by year
2026: 2 · 2025: 3 · 2024: 1 · 2023: 6 · 2022: 3 · 2021: 5 · 2020: 5 · 2019: 11 · 2018: 8 · 2017: 7 · 2016: 4 · 2015: 6 · 2014: 4
FWCI
2.29
Type
journal article
Language
en
Open access
Locations
  • Physiological Reports (publishedVersion, cc-by)
  • Europe PMC (PubMed Central) (publishedVersion, cc-by)
  • PubMed Central (publishedVersion, cc-by)
  • PubMed (publishedVersion)
  • Newcastle University ePrints (Newcastle Univesity)
Funders
  • Howard Hughes Medical Institute
  • Epilepsy Research U.K
  • MRC
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Neural dynamics and brain function
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ion channel regulation and function
Keywords
pyramidal neurons, GABAA receptor, dendritic compartmentalization, input-output function, cortical neurons

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