title: Interstrain differences of ionotropic glutamate receptor subunits in the hippocampus and induction of hippocampal sclerosis with pilocarpine in mice.
abstract: Rodent strains used in epilepsy research have various neurological characteristics. These differences were suggested to be attributed to the diverse densities of the ionotropic glutamate receptor (iGluR) subunits. However, previous studies failed to find interstrain differences in the hippocampal receptor levels. We supposed that a detailed layer-to-layer analysis of the iGluR subunits in the hippocampus might reveal strain-dependent differences in their base lines and reactions induced by pilocarpine (PILO) between two mouse strains without documented ancestors. Levels of iGluR subunits in Balb/c and NMRI mice were compared using semiquantitative immunohistochemistry. The alterations in the neuronal circuitry were validated by neuropeptide Y (NPY) and neuronal nuclear antigen (NeuN) immunostainings. Immunohistochemistry showed interstrain laminar differences in some subunits of both the control and PILO-treated animals. The seizure-induced irreversible neuronal changes were accompanied by reduced GluA1 and GluA2 levels. Their changes were inversely correlated in the individual NMRI mice by Pearson's method. Increase in NPY immunoreactivity showed positive correlation with GluA1, and negative correlation with GluA2. The NMRI strain was susceptible to PILO-induced hippocampal sclerosis, while the Balb/c animals showed resistance. Basal levels of iGluRs differ in mouse strains, which may account for the interstrain differences in their reactions to the convulsant.
authors.affiliation: Department of Anatomy, Faculty of Medicine, University of Szeged, Szeged, Hungary. Electronic address: dobo.endre@med.u-szeged.hu.
authors.forename: Endre
authors.initials: E
authors.lastname: Dobó
authors.affiliation: Department of Anatomy, Faculty of Medicine, University of Szeged, Szeged, Hungary.
authors.forename: Ibolya
authors.initials: I
authors.lastname: Török
authors.affiliation: Department of Anatomy, Faculty of Medicine, University of Szeged, Szeged, Hungary.
authors.forename: András
authors.initials: A
authors.lastname: Mihály
authors.affiliation: Department of Anatomy, Faculty of Medicine, University of Szeged, Szeged, Hungary.
authors.forename: Norbert
authors.initials: N
authors.lastname: Károly
authors.affiliation: Department of Anatomy, Faculty of Medicine, University of Szeged, Szeged, Hungary.
authors.forename: Beáta
authors.initials: B
authors.lastname: Krisztin-Péva
mesh_terms: D000818:Animals; D003292:Convulsants; D004268:DNA-Binding Proteins; D006624:Hippocampus / Q000378:metabolism* / Q000473:pathology*; D007091:Image Processing, Computer-Assisted; D007150:Immunohistochemistry; D008297:Male; D051379:Mice; D008807:Mice, Inbred BALB C; D009415:Nerve Net / Q000473:pathology; D009419:Nerve Tissue Proteins / Q000378:metabolism; D009478:Neuropeptide Y / Q000378:metabolism; D009687:Nuclear Proteins / Q000378:metabolism; D010862:Pilocarpine; D018091:Receptors, AMPA / Q000187:drug effects / Q000235:genetics / Q000378:metabolism; D058468:Receptors, Ionotropic Glutamate / Q000378:metabolism*; D012598:Sclerosis / Q000139:chemically induced / Q000473:pathology; D012640:Seizures / Q000473:pathology; D013045:Species Specificity
chemical_list: D003292:Convulsants; D004268:DNA-Binding Proteins; D009419:Nerve Tissue Proteins; D009478:Neuropeptide Y; D009687:Nuclear Proteins; D010862:Pilocarpine; D018091:Receptors, AMPA; D058468:Receptors, Ionotropic Glutamate; C492380:NeuN protein, mouse; C104722:glutamate receptor ionotropic, AMPA 2
keywords: Glutamate receptor; Hippocampal sclerosis; Hippocampus; Interstrain difference; Pilocarpine