Cited by 70Neuroscience and Neuropharmacology ResearchNeural dynamics and brain functionEpilepsy research and treatment

EEG-β/γ spectral power elevation in rat: a translatable biomarker elicited by GABAAα2/3-positive allosteric modulators at nonsedating anxiolytic doses

Christian, Edward P., Snyder, Dean H., Song, Wei, Gurley, David A., Smolka, Joanne, Maier, Donna L., Ding, Min, Gharahdaghi, Farzin +9 more·2015·Journal of Neurophysiology

Abstract

Benzodiazepine drugs, through interaction with GABA(Aα1), GABA(Aα2,3), and GABA(Aα5) subunits, modulate cortical network oscillations, as reflected by a complex signature in the EEG power spectrum. Recent drug discovery efforts have developed GABA(Aα2,3)-subunit-selective partial modulators in an effort to dissociate the side effect liabilities from the efficacy imparted by benzodiazepines. Here, we evaluated rat EEG and behavioral end points during dosing of nine chemically distinct compounds that we confirmed statistically to selectively to enhance GABA(Aα2,3)-mediated vs. GABA(Aα1) or GABA(Aα5) currents in voltage clamped oocytes transfected with those GABA(A) subunits. These compounds were shown with in vivo receptor occupancy techniques to competitively displace [(3)H]flumazenil in multiple brain regions following peripheral administration at increasing doses. Over the same dose range, the compounds all produced dose-dependent EEG spectral power increases in the β- and and γ-bands. Finally, the dose range that increased γ-power coincided with that eliciting punished over unpunished responding in a behavioral conflict model of anxiety, indicative of anxiolysis without sedation. EEG γ-band power increases showed a significant positive correlation to in vitro GABA(Aα2,3) modulatory intrinsic activity across the compound set, further supporting a hypothesis that this EEG signature was linked specifically to pharmacological modulation of GABA(Aα2,3) signaling. These findings encourage further evaluation of this EEG signature as a noninvasive clinical translational biomarker that could ultimately facilitate development of GABA(Aα2,3)-subtype-selective drugs for anxiety and potentially other indications.

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Crossref · 10.1152/jn.00539.2013

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  • α3GABAARs have been implicated in anxiety, fear and/or response to chronic stress, with contradictory findings.

    “In addition, γ2GABAARs [11], α1GABAARs [10, 12], α3GABAARs [13] (but see [14-16] for contradictory findings), and more recently, α5GABAARs [16-18, 4] have been implicated in anxiety, fear and/or response to chronic stress.”

    From An emerging circuit pharmacology of GABAA receptors (2018) · cites this paper as [14]

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Authors
Christian, E. P., Snyder, D. H., Song, W., Gurley, D. A., Smolka, J., Maier, D. L., Ding, M., Gharahdaghi, F., Liu, X. F., Chopra, M., Ribadeneira, M., Chapdelaine, M. J., Dudley, A., Arriza, J. L., Maciag, C., Quirk, M. C., & Doherty, J. J.
Affiliations
AstraZeneca (United States) (US)
Corresponding author
Christian, Edward P.
Venue
Journal of Neurophysiology
Published
2015-01-01
Volume
113
Issue
1
Pages
116-131
ISSN
  • 0022-3077 (ISSN-L)
  • 1522-1598
OpenAlex
W1985639681
Cited by
68
References
43
Citations by year
2026: 4 · 2025: 5 · 2024: 7 · 2023: 4 · 2022: 2 · 2021: 11 · 2020: 5 · 2019: 7 · 2018: 9 · 2017: 5 · 2016: 7 · 2015: 2
FWCI
2.13
Type
journal article
Language
en
Open access
closed
Locations
  • Journal of Neurophysiology (publishedVersion)
  • PubMed (publishedVersion)
Topics
  • Life Sciences › Neuroscience › Cellular and Molecular Neuroscience › Neuroscience and Neuropharmacology Research
  • Life Sciences › Neuroscience › Cognitive Neuroscience › Neural dynamics and brain function
  • Health Sciences › Medicine › Psychiatry and Mental health › Epilepsy research and treatment
Keywords
allosteric modulators, anxiety biomarkers, receptor occupancy, flumazenil binding, cortical oscillations, rats
MeSH terms
Animals, Anxiety, Auditory Perception, Beta Rhythm, Brain, Conditioning, Operant, Conflict, Psychological, Dose-Response Relationship, Drug, Electrodes, Implanted, Electroencephalography, Male, Receptors, GABA-A, Anti-Anxiety Agents, Linear Models, Rats, Sprague-Dawley, Patch-Clamp Techniques, GABA Agents, Rats, Long-Evans, Gamma Rhythm

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