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Localization of electrogenic Na/bicarbonate cotransporter NBCe1 variants in rat brain
D Majumdar1, A B Maunsbach, J J Shacka
1Department of Physiology and Biophysics, University of Alabama at Birmingham, 1918 University Boulevard, 812 MCLM, Birmingham, AL 35294, USA.
Neuroscience
|June 28, 2008
Summary
The electrogenic sodium/bicarbonate cotransporter (NBCe1) variants B and C are predominant in the rat brain, showing distinct neuronal and glial localization. This finding clarifies NBCe1
Area of Science:
- Neuroscience
- Molecular Biology
- Physiology
Background:
- The acid-base balance in the nervous system is crucial for neuronal function.
- Electrogenic sodium/bicarbonate cotransporters (NBCs) play a key role in maintaining this balance.
- Specific splice variants of NBCe1 (NBCe1-A, -B, and -C) have been identified, but their precise localization in the brain remains unclear.
Purpose of the Study:
- To investigate the distribution and localization of electrogenic sodium/bicarbonate cotransporter NBCe1 splice variants (NBCe1-A, -B, and -C) within the rat brain.
- To determine which NBCe1 variants are predominant in different brain regions.
- To elucidate the cellular and subcellular localization of NBCe1 variants in neurons and glia.
Main Methods:
- In situ hybridization was used to assess the expression patterns of NBCe1 variants.
- Immunoblotting was employed to detect NBCe1 variant protein levels.
- Immunohistochemistry and immunogold electron microscopy were utilized to determine the cellular and subcellular localization of NBCe1 variants, co-localizing with neuronal and astrocytic markers.
Main Results:
- NBCe1-B and -C variants were found to be the predominant splice variants in the rat brain, particularly in the cerebellum, hippocampus, piriform cortex, and olfactory bulb.
- In situ hybridization showed strong labeling for NBCe1-B and -C in hippocampal granule neurons and cerebellar granule and Purkinje cells (including Bergmann glia).
- Immunohistochemistry and electron microscopy revealed distinct localization patterns: NBCe1-A/B variants were primarily intracellular in neurons, while NBCe1-C variants were localized to astrocytes at the plasma membrane, particularly surrounding neurons.
Conclusions:
- The NBCe1-B and NBCe1-C splice variants are the major forms of this transporter expressed in the rat brain.
- These predominant variants exhibit differential expression and localization within specific neuronal populations and glial cells.
- Understanding the distinct localization profiles of NBCe1 variants is essential for comprehending their roles in regulating brain acid-base homeostasis and neuronal function.
