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. 1989 May;83(5):1724–1732. doi: 10.1172/JCI114073

Sodium channels from human brain RNA expressed in Xenopus oocytes. Basic electrophysiologic characteristics and their modification by diphenylhydantoin.

G F Tomaselli 1, E Marban 1, G Yellen 1
PMCID: PMC303882  PMID: 2468690

Abstract

We describe the expression and characterization of sodium channels from human brain RNA in the Xenopus oocyte. The expressed channel, studied by whole-cell voltage clamp, reveals characteristic selectivity for sodium as the permeant ion, voltage-dependent gating, and block by nanomolar concentrations of tetrodotoxin. Such channels are not seen in control oocytes injected with solvent only. The anticonvulsant diphenylhydantoin (DPH) inhibits the expressed channel in a voltage- and use-dependent manner, much like the effect seen in primary mammalian neuronal preparations. The inhibition of the expressed human sodium channel by DPH can be described by models previously developed to explain block of Na channels by local anesthetics. The preferential block of Na channels during depolarization helps explain the selectivity of DPH for neurons involved in seizure activity.

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Selected References

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