Cited by 386Neuroscience and Neuropharmacology ResearchNeural dynamics and brain functionNeuroinflammation and Neurodegeneration Mechanisms

Regulation of cortical microcircuits by unitary GABA-mediated volume transmission

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Oláh, Szabolcs, Füle, Miklós, Komlósi, Gergely, Varga, Csaba, Báldi, Rita, Barzó, Pál, Tamás, Gábor·2009·Nature

Abstract

GABA (gamma-aminobutyric acid) is predominantly released by local interneurons in the cerebral cortex to particular subcellular domains of the target cells. This suggests that compartmentalized, synapse-specific action of GABA is required in cortical networks for phasic inhibition. However, GABA released at the synaptic cleft diffuses to receptors outside the postsynaptic density and thus tonically activates extrasynaptic GABA(A) and GABA(B) receptors, which include subtypes of both receptor families especially sensitive to low concentrations of GABA. The synaptic and extrasynaptic action of GABA corroborates the idea that neurons of the brain use synaptic (or wiring) transmission and non-synaptic (or volume) transmission for communication. However, re-uptake mechanisms restrict the spatial extent of extrasynaptic GABA-mediated effects, and it has been proposed that the concerted action of several presynaptic interneurons, the sustained firing of individual cells or an increase in release-site density is required to reach ambient GABA levels sufficient to activate extrasynaptic receptors. Here we show that individual neurogliaform cells release enough GABA for volume transmission within the axonal cloud and, thus, that neurogliaform cells do not require synapses to produce inhibitory responses in the overwhelming majority of nearby neurons. Neurogliaform cells suppress connections between other neurons acting on presynaptic terminals that do not receive synapses at all in the cerebral cortex. They also reach extrasynaptic, delta-subunit-containing GABA(A) (GABA(Adelta)) receptors responsible for tonic inhibition. We show that GABA(Adelta) receptors are localized to neurogliaform cells preferentially among cortical interneurons. Neurosteroids, which are modulators of GABA(Adelta) receptors, alter unitary GABA-mediated effects between neurogliaform cells. In contrast to the specifically placed synapses formed by other interneurons, the output of neurosteroid-sensitive neurogliaform cells represents the ultimate form of the lack of spatial specificity in GABA-mediated systems, leading to long-lasting network hyperpolarization combined with widespread suppression of communication in the local circuit.

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Crossref · 10.1038/nature08503

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  • An unusual anatomical feature of NGFCs is their remarkably high density of small area en passant boutons that in many cases (50-75% of terminals) do not have clear postsynaptic targets.

    “An unusual anatomical feature of NGFCs is their remarkably high density of small area en passant boutons that in many cases (50–75% of terminals) do not have clear postsynaptic targets (102, 858, 1172).”

    From Hippocampal GABAergic Inhibitory Interneurons (2017) · cites this paper as [858]

  • Molecular markers associated with NGFCs include NPY, reelin, neuronal nitric oxide synthase (nNOS), α-actinin 2, and COUP transcription factor 2 (COUPTF2).

    “Molecular markers associated with NGFCs include NPY, reelin, neuronal nitric oxide synthase (nNOS), α-actinin 2, and COUP transcription factor 2 (COUPTF2) (48, 367, 549, 796, 858, 926, 1137).”

    From Hippocampal GABAergic Inhibitory Interneurons (2017) · cites this paper as [858]

  • Even at synaptic junctions with identifiable postsynaptic elements (typically principal cell spines, spine necks, or dendritic shafts), NGFC inputs exhibit a strikingly wide synaptic cleft.

    “Even at synaptic junctions with identifiable postsynaptic elements (typically principal cell spines, spine necks, or dendritic shafts), NGFC inputs exhibit a strikingly wide synaptic cleft (858).”

    From Hippocampal GABAergic Inhibitory Interneurons (2017) · cites this paper as [858]

  • The cloud of GABA generated from NGFC release can also activate presynaptic GABABR to mediate homosynaptic and heterosynaptic depression of GABAergic and glutamatergic release sometimes with remarkable target cell specificity.

    “In addition, the cloud of GABA generated from NGFC release can also activate presynaptic GABABR to mediate homosynaptic and heterosynaptic depression of GABAergic and glutamatergic release (48, 858, 859, 926, 927) sometimes with remarkable target cell specificity (204).”

    From Hippocampal GABAergic Inhibitory Interneurons (2017) · cites this paper as [858]

  • While neocortical NGFCs can be found throughout all layers, they are particularly enriched in supragranular layers and form a major constituent cell population in L1.

    “While neocortical NGFCs can be found throughout all layers, they are particularly enriched in supragranular layers and form a major constituent cell population in L1 (564, 858, 1017, 1074, 1086, 1134).”

    From Hippocampal GABAergic Inhibitory Interneurons (2017) · cites this paper as [858]

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Authors
Oláh, S., Füle, M., Komlósi, G., Varga, C., Báldi, R., Barzó, P., & Tamás, G.
Affiliations
University of Szeged (HU)
Corresponding author
Tamás, Gábor
Venue
Nature
Published
2009-10
Volume
461
Issue
7268
Pages
1278-1281
ISSN
  • 0028-0836 (ISSN-L)
  • 1476-4687
OpenAlex
W2061619540
Cited by
386
References
32
Citations by year
2026: 13 · 2025: 20 · 2024: 17 · 2023: 13 · 2022: 18 · 2021: 16 · 2020: 28 · 2019: 11 · 2018: 19 · 2017: 23 · 2016: 22 · 2015: 20 · 2014: 35 · 2013: 35 · 2012: 33
FWCI
13.16
Type
journal article
Language
en
Open access
Locations
  • Nature (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
  • RePEc: Research Papers in Economics (submittedVersion)
Funders
  • Howard Hughes Medical Institute
  • Boehringer Ingelheim Fonds
  • Magyar Tudományos Akadémia
  • National Institutes of Health
  • National Institute of Neurological Disorders and Stroke (NS535915, R01NS035915)
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Neural dynamics and brain function
  • Life Sciences › Neuroscience › Neurology › Neuroinflammation and Neurodegeneration Mechanisms
Keywords
neurogliaform cells, cortical microcircuits, neurosteroids, GABA reuptake, extrasynaptic GABAA receptors, postpartum depression, premenstrual syndrome, presynaptic inhibition
MeSH terms
Animals, Axons, gamma-Aminobutyric Acid, Interneurons, Models, Neurological, Neuroglia, Receptors, GABA-A, Somatosensory Cortex, Synapses, Rats, Wistar, Receptors, GABA-B, Paracrine Communication, Rats

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