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- W2012526213 abstract "Background The abundance of a specific sodium channel subunit (SkM2) appeared to be altered in vitro in cell cultures from persons susceptible to malignant hyperthermia. This study sought to determine whether these findings are artifacts of cell culture or whether they may be relevant to malignant hyperthermia. Methods Regulation of transcript levels of SkM2, a specific sodium channel alpha-subunit, was determined by mRNA analysis. Functional SkM2 protein was estimated in biopsy sections of vastus lateralis muscle by inhibiting the directly elicited muscle twitch by tetrodotoxin, which can differentiate at least three sodium currents in skeletal muscle. Results The transcript levels of SkM2 were depressed by 115-fold in six of seven persons susceptible to malignant hyperthermia; and the functional expression of the SkM2 protein, based on the tetrodotoxin sensitivity of the directly elicited twitch, was decreased by at least fourfold in muscle from persons susceptible to malignant hyperthermia compared with persons who were not susceptible. Conclusions As in previous studies in cell culture, altered mRNA and/or the functional expression of a specific subunit of the sodium channel (SkM2) was found in biopsy sections of muscle from all 12 persons examined who were susceptible to malignant hyperthermia but in none of the 16 nonsusceptible participants. Human malignant hyperthermia is a heterogeneous disorder, and the down-regulation of SkM2 may be involved in the final common pathway through which mutations in any one of several proteins, including the ryanodine receptor, could render a person susceptible." @default.
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- W2012526213 date "1997-05-01" @default.
- W2012526213 modified "2023-10-17" @default.
- W2012526213 title "Sodium Channel in Human Malignant Hyperthermia " @default.
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- W2012526213 doi "https://doi.org/10.1097/00000542-199705000-00004" @default.
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