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Differential roles of NaV1.2 and NaV1.6 in neocortical pyramidal cell excitability
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Differential roles of NaV1.2 and NaV1.6 in neocortical pyramidal cell excitability
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Differential roles of NaV1.2 and NaV1.6 in neocortical pyramidal cell excitability
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Journal Article
Differential roles of NaV1.2 and NaV1.6 in neocortical pyramidal cell excitability
2025
Overview
Mature neocortical pyramidal cells functionally express two sodium channel (Na V ) isoforms: Na V 1.2 and Na V 1.6. These isoforms are differentially localized to pyramidal cell compartments, and as such are thought to contribute to different aspects of neuronal excitability. But determining their precise roles in pyramidal cell excitability has been hampered by a lack of tools that allow for selective, acute block of each isoform individually. Here, we leveraged aryl sulfonamide-based molecule (ASC) inhibitors of Na V channels that exhibit state-dependent block of both Na V 1.2 and Na V 1.6, along with knock-in mice with changes in Na V 1.2 or Na V 1.6 structure that prevents ASC binding. This allowed for acute, potent, and reversible block of individual isoforms that permitted dissection of the unique contributions of Na V 1.2 and Na V 1.6 in pyramidal cell excitability. Remarkably, block of each isoform had contrasting—and in some situations, opposing—effects on neuronal action potential output, with Na V 1.6 block decreasing and Na V 1.2 block increasing output. Thus, Na V isoforms have unique roles in regulating different aspects of pyramidal cell excitability, and our work may help guide the development of therapeutics designed to temper hyperexcitability through selective Na V isoform blockade.
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