Cited by 164Epilepsy research and treatmentIon channel regulation and functionNeuroscience and Neuropharmacology Research

Impaired Action Potential Initiation in GABAergic Interneurons Causes Hyperexcitable Networks in an Epileptic Mouse Model Carrying a Human NaV1.1 Mutation

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Hedrich, Ulrike B.S., Liautard, Camille, Kirschenbaum, Daniel, Pofahl, Martin, Lavigne, Jennifer, Liu, Yuanyuan, Theiss, Stephan, Slotta, Johannes +5 more·2014·The Journal of Neuroscience

Abstract

Mutations in SCN1A and other ion channel genes can cause different epileptic phenotypes, but the precise mechanisms underlying the development of hyperexcitable networks are largely unknown. Here, we present a multisystem analysis of an SCN1A mouse model carrying the Na V 1.1-R1648H mutation, which causes febrile seizures and epilepsy in humans. We found a ubiquitous hypoexcitability of interneurons in thalamus, cortex, and hippocampus, without detectable changes in excitatory neurons. Interestingly, somatic Na+channels in interneurons and persistent Na+currents were not significantly changed. Instead, the key mechanism of interneuron dysfunction was a deficit of action potential initiation at the axon initial segment that was identified by analyzing action potential firing. This deficit increased with the duration of firing periods, suggesting that increased slow inactivation, as recorded for recombinant mutated channels, could play an important role. The deficit in interneuron firing caused reduced action potential-driven inhibition of excitatory neurons as revealed by less frequent spontaneous but not miniature IPSCs. Multiple approaches indicated increased spontaneous thalamocortical and hippocampal network activity in mutant mice, as follows: (1) more synchronous and higher-frequency firing was recorded in primary neuronal cultures plated on multielectrode arrays; (2) thalamocortical slices examined by field potential recordings revealed spontaneous activities and pathological high-frequency oscillations; and (3) multineuron Ca 2+imaging in hippocampal slices showed increased spontaneous neuronal activity. Thus, an interneuron-specific generalized defect in action potential initiation causes multisystem disinhibition and network hyperexcitability, which can well explain the occurrence of seizures in the studied mouse model and in patients carrying this mutation.

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Crossref · 10.1523/jneurosci.0721-14.2014

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  • Scn1a is a gene that encodes Nav1.1, a sodium channel necessary for PV cell firing.

    “Scn1a is a gene that encodes Nav1.1, a sodium channel necessary for PV cell firing (Ogiwara et al., 2007; Hedrich et al., 2014).”
  • Reduced PV cell spike output may contribute to seizures in mice with genetic knock-in of mutated human Scn1a, which results in subtle changes in Nav1.1 functionality.

    “Recent studies demonstrate that reduced PV cell spike output may contribute to seizures in mice with genetic knock-in of mutated human Scn1a, which results in subtle changes in Nav1.1 functionality (Ogiwara et al., 2007; Hedrich et al., 2014).”

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Authors
Hedrich, U. B. S., Liautard, C., Kirschenbaum, D., Pofahl, M., Lavigne, J., Liu, Y., Theiss, S., Slotta, J., Escayg, A., Dihné, M., Beck, H., Mantegazza, M., & Lerche, H.
Affiliations
  • Hertie Institute for Clinical Brain Research (DE)
  • Centre National de la Recherche Scientifique (FR)
  • University of Bonn (DE)
  • Heinrich Heine University Düsseldorf (DE)
  • Emory University (US)
Venue
The Journal of Neuroscience
Published
2014-11-05
Volume
34
Issue
45
Pages
14874-14889
ISSN
  • 0270-6474 (ISSN-L)
  • 1529-2401
OpenAlex
W1964533239
Cited by
164
References
70
Citations by year
2026: 9 · 2025: 10 · 2024: 15 · 2023: 16 · 2022: 19 · 2021: 20 · 2020: 9 · 2019: 21 · 2018: 13 · 2017: 16 · 2016: 9 · 2015: 6 · 2014: 1
FWCI
8.14
Type
journal article
Language
en
Open access
Locations
  • Journal of Neuroscience (publishedVersion, cc-by-nc-sa)
  • Europe PMC (PubMed Central) (publishedVersion)
  • PubMed Central (publishedVersion)
  • PubMed (publishedVersion)
  • DZNE Pub (submittedVersion)
  • Journal of Neuroscience Nursing
Funders
  • Danish Cancer Society Research Center
  • European Commission
  • Deutsche Forschungsgemeinschaft (SFB1089)
  • National Institutes of Health
  • National Institute of Neurological Disorders and Stroke (R01NS072221)
Topics
  • Health Sciences › Medicine › Psychiatry and Mental health › Epilepsy research and treatment
  • Life Sciences › Biochemistry, Genetics and Molecular Biology › Molecular Biology › Ion channel regulation and function
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
Keywords
SCN1A, Nav1.1, GABAergic interneurons, action potential generation, axon initial segment, slow inactivation, disinhibition, network hyperexcitability, febrile seizures, epilepsy, thalamocortical network, hippocampal network activity, inhibitory postsynaptic currents, sodium channel mutations
MeSH terms
Action Potentials, Animals, Axons, Brain, Calcium, Cells, Cultured, Epilepsy, Humans, Interneurons, Mice, Inbred C57BL, Mutation, Nerve Net, Mice, Inhibitory Postsynaptic Potentials, GABAergic Neurons, NAV1.1 Voltage-Gated Sodium Channel

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