Differential expression of HCN subunits alters voltage-dependent gating of h-channels in CA1 pyramidal neurons from dorsal and ventral hippocampus

Kelly A. Dougherty, Daniel A. Nicholson, Laurea Diaz, Eric W. Buss, Krystina M. Neuman, Dane M. Chetkovich, Daniel Johnston

Research output: Contribution to journalArticle

53 Scopus citations

Abstract

The rodent hippocampus can be divided into dorsal (DHC) and ventral (VHC) domains on the basis of behavioral, anatomical, and biochemical differences. Recently, we reported that CA1 pyramidal neurons from the VHC were intrinsically more excitable than DHC neurons, but the specific ionic conductances contributing to this difference were not determined. Here we investigated the hyperpolarizationactivated current (Ih) and the expression of HCN1 and HCN2 channel subunits in CA1 pyramidal neurons from the DHC and VHC. Measurement of Ih with cell-attached patches revealed a significant depolarizing shift in the V1/2 of activation for dendritic h-channels in VHC neurons (but not DHC neurons), and ultrastructural immunolocalization of HCN1 and HCN2 channels revealed a significantly larger HCN1-to-HCN2 ratio for VHC neurons (but not DHC neurons). These observations suggest that a shift in the expression of HCN1 and HCN2 channels drives functional changes in Ih for VHC neurons (but not DHC neurons) and could thereby significantly alter the capacity for dendritic integration of these neurons.

Original languageEnglish (US)
Pages (from-to)1940-1953
Number of pages14
JournalJournal of neurophysiology
Volume109
Issue number7
DOIs
StatePublished - 2013

Keywords

  • CA1 pyramidal neuron
  • Dorsal hippocampus
  • HCN channel
  • Hyperpolarization-activated current
  • Ventral hippocampus

ASJC Scopus subject areas

  • Neuroscience(all)
  • Physiology

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