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• W2803860160 abstract "Objective De novo mutations of SCN8A, encoding the voltage-gated sodium channel NaV1.6, have been associated with a severe infant onset epileptic encephalopathy. Individuals with SCN8A encephalopathy have a mean age of seizure onset of 4-5 months, with multiple seizure types that are often refractory to treatment with available drugs. Anecdotal reports suggest that high-dose phenytoin is effective for some patients, but there are associated adverse effects and potential for toxicity. Functional characterization of several SCN8A encephalopathy variants has shown that elevated persistent sodium current is one of several common biophysical defects. Therefore, specifically targeting elevated persistent current may be a useful therapeutic strategy in some cases. Methods The novel sodium channel modulator GS967 has greater preference for persistent as opposed to peak current and nearly 10-fold greater potency than phenytoin. We evaluated the therapeutic effect of GS967 in the Scn8aN1768D/+ mouse model carrying an SCN8A patient mutation that results in elevated persistent sodium current. We also performed patch clamp recordings to assess the effect of GS967 on peak and persistent sodium current and excitability in hippocampal neurons from Scn8aN1768D/+ mice. Results GS967 potently blocked persistent sodium current without affecting peak current, normalized action potential morphology, and attenuated excitability in neurons from heterozygous Scn8aN1768D/+ mice. Acute treatment with GS967 provided dose-dependent protection against maximal electroshock–induced seizures in Scn8aN1768D/+ and wild-type mice. Chronic treatment of Scn8aN1768D/+ mice with GS967 resulted in lower seizure burden and complete protection from seizure-associated lethality observed in untreated Scn8aN1768D/+ mice. Protection was achieved at a chronic dose that did not cause overt behavioral toxicity or sedation. Significance Persistent sodium current modulators like GS967 may be an effective precision targeting strategy for SCN8A encephalopathy and other functionally similar channelopathies when elevated persistent sodium current is the primary dysfunction." @default.
• W2803860160 created "2018-06-01" @default.
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• W2803860160 date "2018-05-21" @default.
• W2803860160 modified "2023-09-26" @default.
• W2803860160 title "The novel sodium channel modulator GS-458967 (GS967) is an effective treatment in a mouse model of <i>SCN8A</i> encephalopathy" @default.
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• W2803860160 doi "https://doi.org/10.1111/epi.14196" @default.
• W2803860160 hasPubMedCentralId "https://www.ncbi.nlm.nih.gov/pmc/articles/6142814" @default.
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