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- W2417280743 abstract "Voltage-gated sodium channels (VGSCs) are widely distributed in most cells and tissues, performing many physiological functions. As one kind of membrane proteins in the lipid bilayer, whether lipid composition plays a role in the gating and pharmacological sensitivity of VGSCs still remains unknown. Through the application of sphingomyelinase D (SMaseD), the gating and pharmacological sensitivity of the endogenous VGSCs in neuroblastoma ND7-23 cell line to BmK I and BmK AS, two sodium channel-specific modulators from the venom of Buthus martensi Karsch (BmK), were assessed before and after lipid modification. The results showed that, in ND7-23 cells, SMaseD did not change the gating properties of VGSCs. However, SMaseD application altered the slope factor of activation with the treatment of 30 nmol/L BmK I, but caused no significant effects at 100 and 500 nmol/L BmK I. With low concentration of BmK I (30 and 100 nmol/L) treatment, the application of SMaseD exerted hyperpolarizing effects on both slow-inactivation and steady-state inactivation, and increased the recovery time constant, whereas total inactivation and recovery remained unaltered at 500 nmol/L BmK I. Meanwhile, SMaseD modulation hyperpolarized the voltage dependence of slow-inactivation at 0.1 nmol/L BmK AS and altered the slope factor of slow-inactivation at 10 nmol/L BmK AS, whereas other parameters remained unchanged. These results indicated a possibility that the lipid bilayer would disturb the pharmacological sensitivity of VGSCs for the first time, which might open a new way of developing new drugs for treating sodium channelopathies." @default.
- W2417280743 created "2016-06-24" @default.
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- W2417280743 date "2015-06-25" @default.
- W2417280743 modified "2023-10-18" @default.
- W2417280743 title "Lipid bilayer modification alters the gating properties and pharmacological sensitivity of voltage-gated sodium channel." @default.
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