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Open Access 01-12-2015 | Research

Navβ4 regulates fast resurgent sodium currents and excitability in sensory neurons

Authors: Cindy Barbosa, Zhi-Yong Tan, Ruizhong Wang, Wenrui Xie, Judith A. Strong, Reesha R. Patel, Michael R. Vasko, Jun-Ming Zhang, Theodore R. Cummins

Published in: Molecular Pain | Issue 1/2015

Abstract

Background

Increased electrical activity in peripheral sensory neurons including dorsal root ganglia (DRG) and trigeminal ganglia neurons is an important mechanism underlying pain. Voltage gated sodium channels (VGSC) contribute to the excitability of sensory neurons and are essential for the upstroke of action potentials. A unique type of VGSC current, resurgent current (INaR), generates an inward current at repolarizing voltages through an alternate mechanism of inactivation referred to as open-channel block. INaRs are proposed to enable high frequency firing and increased INaRs in sensory neurons are associated with pain pathologies. While Nav1.6 has been identified as the main carrier of fast INaR, our understanding of the mechanisms that contribute to INaR generation is limited. Specifically, the open-channel blocker in sensory neurons has not been identified. Previous studies suggest Navβ4 subunit mediates INaR in central nervous system neurons. The goal of this study was to determine whether Navβ4 regulates INaR in DRG sensory neurons.

Results

Our immunocytochemistry studies show that Navβ4 expression is highly correlated with Nav1.6 expression predominantly in medium-large diameter rat DRG neurons. Navβ4 knockdown decreased endogenous fast INaR in medium-large diameter neurons as measured with whole-cell voltage clamp. Using a reduced expression system in DRG neurons, we isolated recombinant human Nav1.6 sodium currents in rat DRG neurons and found that overexpression of Navβ4 enhanced Nav1.6 INaR generation. By contrast neither overexpression of Navβ2 nor overexpression of a Navβ4-mutant, predicted to be an inactive form of Navβ4, enhanced Nav1.6 INaR generation. DRG neurons transfected with wild-type Navβ4 exhibited increased excitability with increases in both spontaneous activity and evoked activity. Thus, Navβ4 overexpression enhanced INaR and excitability, whereas knockdown or expression of mutant Navβ4 decreased INaR generation.

Conclusion

INaRs are associated with inherited and acquired pain disorders. However, our ability to selectively target and study this current has been hindered due to limited understanding of how it is generated in sensory neurons. This study identified Navβ4 as an important regulator of INaR and excitability in sensory neurons. As such, Navβ4 is a potential target for the manipulation of pain sensations.

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Title: Navβ4 regulates fast resurgent sodium currents and excitability in sensory neurons
Authors: Cindy Barbosa
Zhi-Yong Tan
Ruizhong Wang
Wenrui Xie
Judith A. Strong
Reesha R. Patel
Michael R. Vasko
Jun-Ming Zhang
Theodore R. Cummins
Publication date: 01-12-2015
Publisher: BioMed Central
Published in: Molecular Pain / Issue 1/2015
Electronic ISSN: 1744-8069
DOI: https://doi.org/10.1186/s12990-015-0063-9

At a glance: The STEP trials

Springer Medicine

Navβ4 regulates fast resurgent sodium currents and excitability in sensory neurons

Abstract

Background

Results

Conclusion

At a glance: The STEP trials

Springer Medicine

Abstract

Background

Results

Conclusion

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