FGF14 modulates resurgent sodium current in mouse cerebellar Purkinje neurons
- Duke University Medical Center, United States
Abstract
Rapid firing of cerebellar Purkinje neurons is facilitated in part by a voltage-gated Na+ (NaV) 'resurgent' current, which allows renewed Na+ influx during membrane repolarization. Resurgent current results from unbinding of a blocking particle that competes with normal channel inactivation. The underlying molecular components contributing to resurgent current have not been fully identified. Here, we show that the NaV channel auxiliary subunit FGF14 'b' isoform, a locus for inherited spinocerebellar ataxias, controls resurgent current and repetitive firing in Purkinje neurons. FGF14 knockdown biased NaV channels towards the inactivated state by decreasing channel availability, diminishing the 'late' NaV current, and accelerating channel inactivation rate, thereby reducing resurgent current and repetitive spiking. Critical for these effects was both the alternatively spliced FGF14b N-terminus and direct interaction between FGF14b and the NaV C-terminus. Together, these data suggest that the FGF14b N-terminus is a potent regulator of resurgent NaV current in cerebellar Purkinje neurons.
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Ethics
Animal experimentation: This study was performed in strict accordance with the recommendations in the Guide for the Care and Use of Laboratory Animals of the National Institutes of Health. All of the animals were handled according to approved institutional animal care and use committee (IACUC) of Duke University for the protocol #A292-13-11.
Copyright
© 2014, Yan et al.
This article is distributed under the terms of the Creative Commons Attribution License permitting unrestricted use and redistribution provided that the original author and source are credited.
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FGF14 modulates resurgent sodium current in mouse cerebellar Purkinje neurons
eLife 3:e04193.
https://doi.org/10.7554/eLife.04193
