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Protein kinase C isoform antagonism controls BNaC2 (ASIC1) function
Bakhrom K Berdiev1, Jiazeng Xia, Biljana Jovov
1Department of Physiology and Biophysics, University of Alabama at Birmingham, Birmingham, Alabama 35294, USA.
The Journal of Biological Chemistry
|September 24, 2002
Summary
Protein kinase C (PKC) isoforms differentially regulate BNaC2 channels. Specific PKC isoforms inhibit BNaC2, while others have no effect, suggesting complex channel modulation in glioma cells.
Area of Science:
- Neuroscience
- Molecular Biology
- Cell Signaling
Background:
- Protein kinase C (PKC) plays a role in cellular signaling pathways.
- BNaC2 channels are involved in regulating ion conductance.
Purpose of the Study:
- To investigate the role and expression of various protein kinase C (PKC) isoforms in the regulation of BNaC2 channels.
- To understand the functional impact of different PKC isoforms on BNaC2 activity in glioma cells.
Main Methods:
- Reverse transcriptase PCR (RT-PCR) for mRNA expression analysis of PKC isoforms.
- Western blot analysis for protein expression confirmation.
- Bilayer and patch-clamp electrophysiology to assess BNaC2 channel activity.
- In vitro phosphorylation assays.
Main Results:
- Glioma cells predominantly express PKC alpha, epsilon/epsilon', delta, and zeta isoforms at mRNA and protein levels, with limited expression of betaI/betaII.
- PKC holoenzyme and PKCbetaI/betaII isoforms inhibited BNaC2 activity, while PKCepsilon and PKCzeta had no effect.
- PKCbetaI/betaII inhibition of BNaC2 was counteracted by PKCepsilon/PKCzeta.
- PKC isoforms phosphorylated BNaC2 in vitro, and PKCbetaI/betaII inhibited basal Na+ conductance.
Conclusions:
- Differential expression and functional antagonism of PKC isoforms regulate BNaC2 activity.
- Multiple PKC isoforms contribute to the complex modulation of BNaC2 channel function in glioma cells.