Premium
Upregulation of inward rectifier K + (Kir2) channels in dentate gyrus granule cells in temporal lobe epilepsy
Author(s) -
Young Christina C.,
Stegen Michael,
Bernard René,
Müller Martin,
Bischofberger Josef,
Veh Rüdiger W.,
Haas Carola A.,
Wolfart Jakob
Publication year - 2009
Publication title -
the journal of physiology
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.802
H-Index - 240
eISSN - 1469-7793
pISSN - 0022-3751
DOI - 10.1113/jphysiol.2009.170746
Subject(s) - dentate gyrus , neuroscience , hippocampal formation , epileptogenesis , patch clamp , granule cell , inward rectifier potassium ion channel , chemistry , biophysics , biology , microbiology and biotechnology , electrophysiology , ion channel , biochemistry , receptor
In humans, temporal lobe epilepsy (TLE) is often associated with Ammon's horn sclerosis (AHS) characterized by hippocampal cell death, gliosis and granule cell dispersion (GCD) in the dentate gyrus. Granule cells surviving TLE have been proposed to be hyperexcitable and to play an important role in seizure generation. However, it is unclear whether this applies to conditions of AHS. We studied granule cells using the intrahippocampal kainate injection mouse model of TLE, brain slice patch‐clamp recordings, morphological reconstructions and immunocytochemistry. With progressing AHS and GCD, ‘epileptic’ granule cells of the injected hippocampus displayed a decreased input resistance, a decreased membrane time constant and an increased rheobase. The resting leak conductance was doubled in epileptic granule cells and roughly 70–80% of this difference were sensitive to K + replacement. Of the increased K + leak, about 50% were sensitive to 1 m m Ba 2+ . Approximately 20–30% of the pathological leak was mediated by a bicuculline‐sensitive GABA A conductance. Epileptic granule cells had strongly enlarged inwardly rectifying currents with a low micromolar Ba 2+ IC 50 , reminiscent of classic inward rectifier K + channels (Irk/Kir2). Indeed, protein expression of Kir2 subunits (Kir2.1, Kir2.2, Kir2.3, Kir2.4) was upregulated in epileptic granule cells. Immunolabelling for two‐pore weak inward rectifier K + channels (Twik1/K2P1.1, Twik2/K2P6.1) was also increased. We conclude that the excitability of granule cells in the sclerotic focus of TLE is reduced due to an increased resting conductance mainly due to upregulated K + channel expression. These results point to a local adaptive mechanism that could counterbalance hyperexcitability in epilepsy.