Gap junctions among dendrites of cortical GABAergic neurons establish a dense and widespread intercolumnar network
Open accessAbstract
Gap junctions are common between cortical GABAergic interneurons but little is known about their quantitative distribution along dendritic profiles. Here, we provide direct morphological evidence that parvalbumin-containing GABAergic neurons in layer 2/3 of the cat visual cortex form dense and far-ranging networks through dendritic gap junctions. Gap junction-coupled networks of parvalbumin neurons were visualized using connexin36 immunohistochemistry and confocal laser-scanning microscopy (CLSM). The direct correspondence of connexin36-immunopositve puncta and gap junctions was confirmed by examining the same structures in both CLSM and electron microscopy. Single parvalbumin neurons with large somata (> or =200 microm2) formed 60.3 +/- 12.2 (mean +/- SD) gap junctions with other cells whereby these contacts were not restricted to proximal dendrites but occurred at distances of up to 380 microm from the soma. In a Sholl analysis of large-type parvalbumin neurons, 21.9 +/- 7.9 gap junctions were within 50 microm of the soma, 21.7 +/- 7.6 gap junctions in a segment between 50 and 100 microm, 11.2 +/- 4.7 junctions between 100 and 150 microm, and 5.6 +/- 3.6 junctions were in more distal segments. Serially interconnected neurons could be traced laterally in a boundless manner through multiple gap junctions. Comparison to the orientation-preference columns revealed that parvalbumin-immunoreactive cells distribute randomly whereby their large dendritic fields overlap considerably and cover different orientation columns. It is proposed that this dense and homogeneous electrical coupling of interneurons supports the precise synchronization of neuronal populations with differing feature preferences thereby providing a temporal frame for the generation of distributed representations.
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Parvalbumin interneurons, interconnected via gap junctions and reciprocal GABAergic synapses, constitute a cellular network able to synchronize the excitatory state of large numbers of pyramidal neurons.
“PVI, which are interconnected via gap junctions (Fukuda et al., 2006) and reciprocal GABAergic synapses, constitute a cellular network able to synchronize the excitatory state of large numbers of PNs (Bartos et al., 2007).”
From Redox dysregulation, neuroinflammation, and NMDA receptor hypofunction: A “central hub” in schizophrenia pathophysiology? (2016) · cites this paper as Fukuda et al., 2006
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- Authors
- Fukuda, T., Kosaka, T., Singer, W., & Galuske, R. A. W.
- Affiliations
- Kyushu University (JP)
- Max Planck Institute for Brain Research (DE)
- Technische Universität Darmstadt (DE)
- Venue
- The Journal of Neuroscience
- Publisher
- Society for Neuroscience
- Published
- 2006-03-29
- Volume
- 26
- Issue
- 13
- Pages
- 3434-3443
- ISSN
- 0270-6474 (ISSN-L)
- 1529-2401
- PMC
- PMC6673861
- OpenAlex
- W1980161519
- Cited by
- 209
- References
- 63
- Citations by year
- 2026: 1 · 2025: 6 · 2024: 5 · 2023: 4 · 2022: 5 · 2021: 5 · 2020: 3 · 2019: 5 · 2018: 8 · 2017: 9 · 2016: 13 · 2015: 7 · 2014: 16 · 2013: 7 · 2012: 13
- FWCI
- 7.06
- Type
- journal article
- Language
- en
- Open access
- hybrid
- doi.org
- Licence
- Locations
- Journal of Neuroscience (publishedVersion, cc-by-nc-sa)
- PubMed Central (publishedVersion)
- PubMed (publishedVersion)
- TUbilio (Technical University of Darmstadt) (submittedVersion)
- Funders
- Alexander von Humboldt-Stiftung
- Topics
- Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Connexins and lens biology
- Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
- Life Sciences › Neuroscience › Cognitive Neuroscience › Neural dynamics and brain function
- Keywords
- gap junctions, parvalbumin interneurons, GABAergic interneurons, connexin 36, cat visual cortex, layer 2/3, neuronal synchronization, dendritic morphology
- MeSH terms
- Animals, Cats, Cells, Cultured, Dendrites, Evoked Potentials, Visual, Female, gamma-Aminobutyric Acid, Interneurons, Male, Nerve Net, Visual Cortex, Gap Junctions
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