Sodium channel heterologous expression in mammalian cells and the role of the endogenous beta1-subunits.
Sodium currents in cell lines transfected with the sole alpha-subunit, or constitutively expressing sodium channels, have an inactivation that is always prevalently mono-exponential. Differently, expression of alpha-subunit in Xenopus oocytes exerts slow inactivating currents with biphasic decay, while simultaneous co-transfection of alpha and beta1 restores a mono-exponential (normal) inactivation. A hypothesis for such differences is that an endogenous presence of beta1 or beta1-alternative...Expand abstract
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