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Increased expression of GluR2‐flip in the hippocampus of the Wistar audiogenic rat strain after acute and kindled seizures
Author(s) -
Gitaí Daniel Leite Góes,
Martinelli Heloisa Nakashima,
Valente Valeria,
Pereira Marilia G. Alves Goulart,
Oliveira José Antonio Cortes,
Elias Carol Fuzeti,
Bittencourt Jackson Cioni,
Leite João Pereira,
CostaNeto Claudio Miguel,
GarciaCairasco Norberto,
PaçóLarson Maria Luisa
Publication year - 2010
Publication title -
hippocampus
Language(s) - English
Resource type - Journals
SCImago Journal Rank - 1.767
H-Index - 155
eISSN - 1098-1063
pISSN - 1050-9631
DOI - 10.1002/hipo.20590
Subject(s) - epileptogenesis , hippocampal formation , dentate gyrus , neuroscience , hippocampus , ampa receptor , subiculum , kindling , glutamate receptor , in situ hybridization , biology , epilepsy , gene expression , receptor , genetics , gene
Abstract The Wistar Audiogenic Rat (WAR) is an epileptic‐prone strain developed by genetic selection from a Wistar progenitor based on the pattern of behavioral response to sound stimulation. Chronic acoustic stimulation protocols of WARs (audiogenic kindling) generate limbic epileptogenesis, confirmed by ictal semiology, amygdale, and hippocampal EEG, accompanied by hippocampal and amygdala cell loss, as well as neurogenesis in the dentate gyrus (DG). In an effort to identify genes involved in molecular mechanisms underlying epileptic process, we used suppression‐subtractive hybridization to construct normalized cDNA library enriched for transcripts expressed in the hippocampus of WARs. The most represented gene among the 133 clones sequenced was the ionotropic glutamate receptor subunit II (GluR2), a member of the α‐amino‐3‐hydroxy‐5‐methyl‐4‐isoxazoleopropionic acid (AMPA) receptor. Although semiquantitative RT‐PCR analysis shows that the hippocampal levels of the GluR2 subunits do not differ between naïve WARs and their Wistar counterparts, we observed that the expression of the transcript encoding the splice‐variant GluR2‐flip is increased in the hippocampus of WARs submitted to both acute and kindled audiogenic seizures. Moreover, using in situ hybridization, we verified upregulation of GluR2‐flip mainly in the CA1 region, among the hippocampal subfields of audiogenic kindled WARs. Our findings on differential upregulation of GluR2‐flip isoform in the hippocampus of WARs displaying audiogenic seizures is original and agree with and extend previous immunohistochemical for GluR2 data obtained in the Chinese P77PMC audiogenic rat strain, reinforcing the association of limbic AMPA alterations with epileptic seizures. © 2009 Wiley‐Liss, Inc.