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Sodium-bicarbonate cotransport current in identified leech glial cells
1Abteilung für Allgemeine Zoologie, Universität Kaiserslautern, Germany.
The Journal of Physiology
|January 1, 1994
Summary
This study reveals that sodium-bicarbonate cotransport in leech glial cells generates electrical currents, influencing intracellular pH and membrane potential. This mechanism is crucial for acid-base balance in these cells.
Area of Science:
- Neuroscience
- Cell Physiology
- Biophysics
Background:
- Glial cells play vital roles in neuronal function and homeostasis.
- Understanding ion transport mechanisms is essential for comprehending cellular regulation.
- The role of sodium-bicarbonate cotransport in glial cells requires further elucidation.
Purpose of the Study:
- To investigate the membrane current associated with sodium-bicarbonate cotransport in leech glial cells.
- To determine the stoichiometry and properties of this cotransporter.
- To assess the impact of this cotransport on intracellular pH and membrane potential.
Main Methods:
- Two-electrode voltage-clamp technique in isolated leech ganglia.
- Intracellular ion-sensitive microelectrodes for pH and ion concentration measurements.
- Application of CO2-bicarbonate solutions and ion substitutions (Na+, Li+).
Main Results:
- Sodium-bicarbonate cotransport evokes outward currents dependent on external Na+ and HCO3-.
- A stoichiometry of 2HCO3-:1Na+ was suggested, with DIDS as an inhibitor.
- The cotransport influences intracellular pH and exhibits electrogenic properties, with Li+ partially substituting for Na+.
Conclusions:
- Sodium-bicarbonate cotransport is an electrogenic process in leech glial cells, contributing to acid-base balance.
- This cotransport mechanism generates bidirectional currents, affecting glial membrane potential and intracellular pH.
- The findings highlight the physiological significance of Na+-HCO3- cotransport in glial cell function.