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Regulation of dendritic excitability by activity-dependent trafficking of the A-type K+ channel subunit Kv4.2 in hippocampal neurons.

Neuron | Jun 21, 2007

Voltage-gated A-type K+ channel Kv4.2 subunits are highly expressed in the dendrites of hippocampal CA1 neurons. However, little is known about the subcellular distribution and trafficking of Kv4.2-containing channels. Here we provide evidence for activity-dependent trafficking of Kv4.2 in hippocampal spines and dendrites. Live imaging and electrophysiological recordings showed that Kv4.2 internalization is induced rapidly upon glutamate receptor stimulation. Kv4.2 internalization was clathrin mediated and required NMDA receptor activation and Ca2+ influx. In dissociated hippocampal neurons, mEPSC amplitude depended on functional Kv4.2 expression level and was enhanced by stimuli that induced Kv4.2 internalization. Long-term potentiation (LTP) induced by brief glycine application resulted in synaptic insertion of GluR1-containing AMPA receptors along with Kv4.2 internalization. We also found evidence of Kv4.2 internalization upon synaptically evoked LTP in CA1 neurons of hippocampal slice cultures. These results present an additional mechanism for synaptic integration and plasticity through the activity-dependent regulation of Kv4.2 channel surface expression.

Pubmed ID: 17582333 RIS Download

Mesh terms: Actins | Animals | Cells, Cultured | Clathrin | Dendrites | Drug Interactions | Embryo, Mammalian | Excitatory Amino Acid Agonists | Excitatory Postsynaptic Potentials | Glycine | Hippocampus | In Vitro Techniques | Long-Term Potentiation | Mutagenesis, Site-Directed | Neurons | Patch-Clamp Techniques | Potassium Channel Blockers | Protein Transport | Rats | Rats, Sprague-Dawley | Shal Potassium Channels | Transduction, Genetic | alpha-Amino-3-hydroxy-5-methyl-4-isoxazolepropionic Acid

Data used in this publication

None found

Associated grants

  • Agency: Intramural NIH HHS, Id: Z01 HD008755-05
  • Agency: Intramural NIH HHS, Id: Z99 HD999999

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