Functional properties of rat brain sodium channels expressed in a somatic cell line.
Transfection of Chinese hamster ovary cells with complementary DNA encoding the RIIA sodium channel alpha subunit from rat brain led to expression of functional sodium channels with the rapid, voltage-dependent activation and inactivation characteristic of sodium channels in brain neurons. The sodium currents mediated by these transfected channels were inhibited by tetrodotoxin, persistently activated by veratridine, and prolonged by Leiurus alpha-scorpion toxin, indicating that neurotoxin receptor sites 1 through 3 were present in functional form. The RIIA sodium channel alpha subunit cDNA alone is sufficient for stable expression of functional sodium channels with the expected kinetic and pharmacological properties in mammalian somatic cells.
Scheuer
T
T
Department of Pharmacology, School of Medicine, University of Washington, Seattle 98195.
Auld
V J
VJ
Boyd
S
S
Offord
J
J
Dunn
R
R
Catterall
W A
WA
D000818:Animals; D001921:Brain / Q000502:physiology*; D002460:Cell Line; D006224:Cricetinae; D003412:Cricetulus; D004553:Electric Conductivity; D005260:Female; D008564:Membrane Potentials / Q000187:drug effects; D008565:Membrane Proteins / Q000235:genetics / Q000502:physiology*; D010053:Ovary; D051381:Rats; D015222:Sodium Channels / Q000187:drug effects / Q000502:physiology*; D013779:Tetrodotoxin / Q000494:pharmacology; D014162:Transfection
D008565:Membrane Proteins; D015222:Sodium Channels; D013779:Tetrodotoxin