Anion transport and GABA signaling
Christian A Hübner1, Knut Holthoff
1Institute of Human Genetics, Jena University Hospital, Friedrich Schiller University Jena Jena, Germany.
Frontiers in Cellular Neuroscience
|November 5, 2013
Summary
The immature brain uses GABA to depolarize neurons, aiding network development. This review explores how bicarbonate transporters influence this crucial developmental GABA switch, impacting brain function.
Area of Science:
- Neuroscience
- Developmental Biology
- Cellular Physiology
Background:
- GABA typically hyperpolarizes neurons via chloride influx.
- In immature brains, reversed chloride gradients cause GABA to depolarize neurons.
- This GABAergic depolarization is vital for neuronal network maturation.
Purpose of the Study:
- To review the role of bicarbonate transporters in brain development.
- To understand how bicarbonate distribution influences the developmental GABA switch.
- To explore the impact of transporters on neuronal function.
Main Methods:
- Literature review of existing research on GABAergic signaling and bicarbonate transport.
- Analysis of studies investigating transporter expression and function during development.
- Synthesis of in vitro and in vivo evidence regarding the GABA switch.
Main Results:
- GABAA receptors conduct both chloride and bicarbonate ions.
- Bicarbonate flux invariably causes depolarization under physiological conditions.
- Intracellular bicarbonate levels are regulated by specific transporters and carbonic anhydrases.
- Transporter expression is developmentally regulated and cell-type specific.
Conclusions:
- Bicarbonate transport is a critical, yet underappreciated, factor in the developmental GABA switch.
- Understanding these transporters is key to comprehending brain maturation and function.
- Further research into specific bicarbonate transporters is warranted.
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