Cited by 185Epilepsy research and treatmentNeuroscience and Neuropharmacology ResearchGlioma Diagnosis and Treatment

GABAergic disinhibition and impaired KCC2 cotransporter activity underlie tumor-associated epilepsy: Reduced KCC2 Underlie Tumor-Related Epilepsy

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Campbell, Susan L., Robel, Stefanie, Cuddapah, Vishnu A., Robert, Stephanie, Buckingham, Susan C., Kahle, Kristopher T., Sontheimer, Harald·2015·Glia

Abstract

Seizures frequently accompany gliomas and often escalate to peritumoral epilepsy. Previous work revealed the importance of tumor-derived excitatory glutamate (Glu) release mediated by the cystine-glutamate transporter (SXC) in epileptogenesis. We now show a novel contribution of GABAergic disinhibition to disease pathophysiology. In a validated mouse glioma model, we found that peritumoral parvalbumin-positive GABAergic inhibitory interneurons are significantly reduced, corresponding with deficits in spontaneous and evoked inhibitory neurotransmission. Most remaining peritumoral neurons exhibit elevated intracellular Cl(-) concentration ([Cl(-) ]i ) and consequently depolarizing, excitatory gamma-aminobutyric acid (GABA) responses. In these neurons, the plasmalemmal expression of KCC2, which establishes the low [Cl(-) ]i required for GABAA R-mediated inhibition, is significantly decreased. Interestingly, reductions in inhibition are independent of Glu release, but the presence of both decreased inhibition and decreased SXC expression is required for epileptogenesis. We suggest GABAergic disinhibition renders peritumoral neuronal networks hyper-excitable and susceptible to seizures triggered by excitatory stimuli, and propose KCC2 as a therapeutic target.

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  1. [32]Lee HH Deeb TZ Walker JA Davies PA Moss SJ 2011b NMDA receptor activity downregulates KCC2 resulting in depolarizing GABAA receptor-mediated currents Nat Neurosci 14 736 743 21532577 PMC3102766

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Authors
Campbell, S. L., Robel, S., Cuddapah, V. A., Robert, S., Buckingham, S. C., Kahle, K. T., & Sontheimer, H.
Affiliations
  • University of Alabama at Birmingham (US)
  • Boston Children's Hospital (US)
Corresponding author
Sontheimer, Harald
Venue
Glia
Publisher
Wiley
Published
2014-07-26
Volume
63
Issue
1
Pages
23-36
ISSN
0894-1491 (ISSN-L)
OpenAlex
W1562543772
Cited by
185
References
53
Citations by year
2026: 21 · 2025: 32 · 2024: 18 · 2023: 28 · 2022: 14 · 2021: 6 · 2020: 16 · 2019: 12 · 2018: 10 · 2017: 9 · 2016: 11 · 2015: 8
FWCI
7.12
Type
journal article
Language
en
Open access
Locations
  • Glia (publishedVersion)
  • PubMed (publishedVersion)
  • PubMed Central (acceptedVersion)
Funders
National Institutes of Health (5R01-NS036692, 2R01-NS052634, 5T32NS048039-03)
Topics
  • Health Sciences › Medicine › Psychiatry and Mental health › Epilepsy research and treatment
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Health Sciences › Medicine › Genetics › Glioma Diagnosis and Treatment
Keywords
tumor-associated epilepsy, glioma, GABAergic disinhibition, parvalbumin interneurons, intracellular chloride, GABAergic inhibition, SLC7A11, glutamate release, epileptogenesis, GABAA receptor, therapeutic target
MeSH terms
K Cl- Cotransporters, Animals, Brain Neoplasms, Epilepsy, Female, gamma-Aminobutyric Acid, Glioma, Interneurons, Male, Synaptic Transmission, Neurons, Receptors, GABA-A, Symporters, Mice

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