Abstract：
:Type IIA rat brain Na+ channel alpha subunits were expressed in CHO cells by nuclear microinjection or by transfection using a vector containing both metallothionein and bacteriophage SP6 promoters. Stable cell lines expressing Na+ channels were isolated, and whole-cell Na+ currents of 0.9-14 nA were recorded. The mean level of whole-cell Na+ current (4.5 nA) corresponds to a cell surface density of approximately 2 channels active at the peak of the Na+ current per microns 2, a density comparable to that observed in the cell bodies of central neurons. The expressed Na+ channels had the voltage dependence, rapid activation and inactivation, and rapid recovery from inactivation characteristic of Na+ channels in brain neurons, bound toxins at neurotoxin receptor sites 1 and 3 with normal properties, and were posttranslationally processed to a normal mature size of 260 kd. Expression of Na+ channel cDNA in CHO cells driven by the metallothionein promoter accurately and efficiently reproduces native Na+ channel properties and provides a method for combined biochemical and physiological analysis of Na+ channel structure and function.
journal_name
Neuronjournal_title
Neuronauthors
West JW,Scheuer T,Maechler L,Catterall WAdoi
10.1016/0896-6273(92)90108-psubject
Has Abstractpub_date
1992-01-01 00:00:00pages
59-70issue
1eissn
0896-6273issn
1097-4199pii
0896-6273(92)90108-Pjournal_volume
8pub_type
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