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Tonically active GABA A receptors: modulating gain and maintaining the tone
Alexey Semyanov1, Matthew C Walker, Dimitri M Kullmann
1Department of Clinical and Experimental Epilepsy, Institute of Neurology, University College London, Queen Square, London WC1N 3BG, UK. a.semyanov@ion.ucl.ac.uk
Trends in Neurosciences
|April 28, 2004
Summary
High-affinity GABAA receptors create a persistent tonic current via ambient GABA, influencing neuronal excitability and information processing. This tonic signaling is vital in various brain regions and may be implicated in neurological disorders like epilepsy.
Area of Science:
- Neuroscience
- Cellular Biology
Background:
- GABA (gamma-aminobutyric acid) receptors mediate inhibitory neurotransmission.
- Beyond synaptic transmission, GABAA receptors generate a persistent tonic current.
Purpose of the Study:
- To explore the significance and mechanisms of tonic GABAA receptor-mediated signaling.
- To understand the role of tonic currents in neuronal function and disease.
Main Methods:
- Review of existing literature on GABAA receptor function.
- Analysis of tonic currents in different brain regions and cell types.
Main Results:
- Tonic GABAA receptor activation by ambient GABA creates a persistent current.
- This tonic signaling exhibits regional and developmental specificity.
- It modulates neuronal excitability, impacting sensory information processing and network activity.
Conclusions:
- Tonic GABAA currents are a fundamental aspect of neuronal signaling with adaptive roles.
- Modulation of these currents offers potential therapeutic targets for conditions like epilepsy.