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The Journal of Neuroscience, March 1, 1999, 19(5):1728-1735
Identification of the Kv2.1 K+ Channel as a Major
Component of the Delayed Rectifier K+ Current in Rat
Hippocampal Neurons
Hideyuki
Murakoshi and
James S.
Trimmer
Department of Biochemistry and Cell Biology and Institute for Cell
and Developmental Biology, State University of New York, Stony
Brook, New York 11794-5215
Molecular cloning studies have revealed the existence of a large
family of voltage-gated K+ channel genes expressed
in mammalian brain. This molecular diversity underlies the vast
repertoire of neuronal K+ channels that regulate
action potential conduction and neurotransmitter release and that are
essential to the control of neuronal excitability. However, the
specific contribution of individual K+ channel gene
products to these neuronal K+ currents is poorly
understood. We have shown previously, using an antibody,
"KC," specific for the Kv2.1 K+ channel
-subunit, the high-level expression of Kv2.1 protein in hippocampal
neurons in situ and in culture. Here we show that KC is
a potent blocker of K+ currents expressed in cells
transfected with the Kv2.1 cDNA, but not of currents expressed in cells
transfected with other highly related K+ channel
-subunit cDNAs. KC also blocks the majority of the slowly inactivating outward current in cultured hippocampal neurons, although
antibodies to two other K+ channel -subunits
known to be expressed in these cells did not exhibit blocking effects.
In all cases the blocking effects of KC were eliminated by previous
incubation with a recombinant fusion protein containing the KC
antigenic sequence. Together these studies show that Kv2.1, which is
expressed at high levels in most mammalian central neurons, is a major
contributor to the delayed rectifier K+ current in
hippocampal neurons and that the KC antibody is a powerful tool for the
elucidation of the role of the Kv2.1 K+ channel in
regulating neuronal excitability.
Key words:
ion channel; CNS; hippocampus; patch clamp; immunofluorescence; potassium current; neuronal excitability; epilepsy
Copyright © 1999 Society for Neuroscience 0270-6474/99/1951728-08$05.00/0
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