A novel DPP6 isoform (DPP6-E) can account for differences between neuronal and reconstituted A-type K+ channels

Jonathon Maffie, Timothy Blenkinsop, Bernardo Rudy

Research output: Contribution to journalArticlepeer-review

15 Scopus citations

Abstract

The channels mediating most of the somatodendritic A-type K+ current in neurons are thought to be ternary complexes of Kv4 pore-forming subunits and two types of auxiliary subunits, the K+ channel interacting proteins (KChIPs) and dipeptidyl-peptidase-like (DPPL) proteins. The channels expressed in heterologous expression systems by mixtures of Kv4.2, KChIP1 and DPP6-S resemble in many properties the A-type current in hippocampal CA1 pyramidal neurons and cerebellar granule cells, neurons with prominent A-type K+ currents. However, the native currents have faster kinetics. Moreover, the A-type currents in neurons in intermediary layers of the superior colliculus have even faster inactivating rates. We have characterized a new DPP6 spliced isoform, DPP6-E, that produces in heterologous cells ternary Kv4 channels with very fast kinetics. DPP6-E is selectively expressed in a few neuronal populations in brain including cerebellar granule neurons, hippocampal pyramidal cells and neurons in intermediary layers of the superior colliculus. The effects of DPP6-E explain past discrepancies between reconstituted and native Kv4 channels in some neurons, and contributes to the diversity of A-type K+ currents in neurons.

Original languageEnglish (US)
Pages (from-to)189-194
Number of pages6
JournalNeuroscience letters
Volume449
Issue number3
DOIs
StatePublished - Jan 16 2009

All Science Journal Classification (ASJC) codes

  • Neuroscience(all)

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