Oxidative stress and Na,K-ATPase activity differential regulation in brainstem and forebrain of Wistar Audiogenic rats may lead to increased seizure susceptibility

•Wistar Audiogenic Rats present increased oxidative stress markers in brainstem.•Wistar Audiogenic Rats present increased Na,K-ATPase activity in forebrain.•Increased Na,K-ATPase activity may maintain Wistar Audiogenic Rats’ brain function.•Oxidative stress may lead to hyperexcitation in Wistar Audi...

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Veröffentlicht in:Brain research 2018-01, Vol.1679, p.171-178
Hauptverfasser: Parreira, Gabriela Machado, Resende, Maria Daniela Aparecida, Garcia, Israel José Pereira, Sartori, Daniela Bueno, Umeoka, Eduardo Henrique de Lima, Godoy, Lívea Dornela, Garcia-Cairasco, Norberto, Barbosa, Leandro Augusto, Santos, Hérica de Lima, Tilelli, Cristiane Queixa
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container_start_page 171
container_title Brain research
container_volume 1679
creator Parreira, Gabriela Machado
Resende, Maria Daniela Aparecida
Garcia, Israel José Pereira
Sartori, Daniela Bueno
Umeoka, Eduardo Henrique de Lima
Godoy, Lívea Dornela
Garcia-Cairasco, Norberto
Barbosa, Leandro Augusto
Santos, Hérica de Lima
Tilelli, Cristiane Queixa
description •Wistar Audiogenic Rats present increased oxidative stress markers in brainstem.•Wistar Audiogenic Rats present increased Na,K-ATPase activity in forebrain.•Increased Na,K-ATPase activity may maintain Wistar Audiogenic Rats’ brain function.•Oxidative stress may lead to hyperexcitation in Wistar Audiogenic Rats’ brainstem. The Wistar Audiogenic Rat (WAR) is a well-characterized seizure-prone, inbred rodent strain that, when acutely stimulated with high-intensity sounds, develops brainstem-dependent tonic-clonic seizures that can evolve to limbic-like, myoclonic (forebrain) seizures when the acoustic stimuli are presented chronically (audiogenic kindling). In order to investigate possible mechanisms underlying WAR susceptibility to seizures, we evaluated Na,K-ATPase activity, Ca-ATPase activity, Mg-ATPase activity, lipid membrane composition and oxidative stress markers in whole forebrain and whole brainstem samples of naïve WAR, as compared to samples from control Wistar rats. We also evaluated the expression levels of α1 and α3 isoforms of Na,K-ATPase in forebrain samples. We observed increased Na,K-ATPase activity in forebrain samples and increased oxidative stress markers (lipid peroxidation, glutathione peroxidase and superoxide dismutase) in brainstem samples of WAR. The Ca-ATPase activity, Mg-ATPase activity, lipid membrane composition and expression levels of α1 and α3 isoforms of Na,K-ATPase were unaltered. In view of previous data showing that the membrane potentials from naïve WAR’s neurons are less negative than that from neurons from Wistar rats, we suggest that Na,K-ATPase increased activity might be involved in a compensatory mechanism necessary to maintain WAR’s brains normal activity. Additionally, ongoing oxidative stress in the brainstem could bring Na,K-ATPase activity back to normal levels, which may explain why WAR’s present increased susceptibility to seizures triggered by high-intensity sound stimulation.
doi_str_mv 10.1016/j.brainres.2017.12.001
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The Wistar Audiogenic Rat (WAR) is a well-characterized seizure-prone, inbred rodent strain that, when acutely stimulated with high-intensity sounds, develops brainstem-dependent tonic-clonic seizures that can evolve to limbic-like, myoclonic (forebrain) seizures when the acoustic stimuli are presented chronically (audiogenic kindling). In order to investigate possible mechanisms underlying WAR susceptibility to seizures, we evaluated Na,K-ATPase activity, Ca-ATPase activity, Mg-ATPase activity, lipid membrane composition and oxidative stress markers in whole forebrain and whole brainstem samples of naïve WAR, as compared to samples from control Wistar rats. We also evaluated the expression levels of α1 and α3 isoforms of Na,K-ATPase in forebrain samples. We observed increased Na,K-ATPase activity in forebrain samples and increased oxidative stress markers (lipid peroxidation, glutathione peroxidase and superoxide dismutase) in brainstem samples of WAR. 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The Wistar Audiogenic Rat (WAR) is a well-characterized seizure-prone, inbred rodent strain that, when acutely stimulated with high-intensity sounds, develops brainstem-dependent tonic-clonic seizures that can evolve to limbic-like, myoclonic (forebrain) seizures when the acoustic stimuli are presented chronically (audiogenic kindling). In order to investigate possible mechanisms underlying WAR susceptibility to seizures, we evaluated Na,K-ATPase activity, Ca-ATPase activity, Mg-ATPase activity, lipid membrane composition and oxidative stress markers in whole forebrain and whole brainstem samples of naïve WAR, as compared to samples from control Wistar rats. We also evaluated the expression levels of α1 and α3 isoforms of Na,K-ATPase in forebrain samples. We observed increased Na,K-ATPase activity in forebrain samples and increased oxidative stress markers (lipid peroxidation, glutathione peroxidase and superoxide dismutase) in brainstem samples of WAR. The Ca-ATPase activity, Mg-ATPase activity, lipid membrane composition and expression levels of α1 and α3 isoforms of Na,K-ATPase were unaltered. In view of previous data showing that the membrane potentials from naïve WAR’s neurons are less negative than that from neurons from Wistar rats, we suggest that Na,K-ATPase increased activity might be involved in a compensatory mechanism necessary to maintain WAR’s brains normal activity. 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The Wistar Audiogenic Rat (WAR) is a well-characterized seizure-prone, inbred rodent strain that, when acutely stimulated with high-intensity sounds, develops brainstem-dependent tonic-clonic seizures that can evolve to limbic-like, myoclonic (forebrain) seizures when the acoustic stimuli are presented chronically (audiogenic kindling). In order to investigate possible mechanisms underlying WAR susceptibility to seizures, we evaluated Na,K-ATPase activity, Ca-ATPase activity, Mg-ATPase activity, lipid membrane composition and oxidative stress markers in whole forebrain and whole brainstem samples of naïve WAR, as compared to samples from control Wistar rats. We also evaluated the expression levels of α1 and α3 isoforms of Na,K-ATPase in forebrain samples. We observed increased Na,K-ATPase activity in forebrain samples and increased oxidative stress markers (lipid peroxidation, glutathione peroxidase and superoxide dismutase) in brainstem samples of WAR. The Ca-ATPase activity, Mg-ATPase activity, lipid membrane composition and expression levels of α1 and α3 isoforms of Na,K-ATPase were unaltered. In view of previous data showing that the membrane potentials from naïve WAR’s neurons are less negative than that from neurons from Wistar rats, we suggest that Na,K-ATPase increased activity might be involved in a compensatory mechanism necessary to maintain WAR’s brains normal activity. Additionally, ongoing oxidative stress in the brainstem could bring Na,K-ATPase activity back to normal levels, which may explain why WAR’s present increased susceptibility to seizures triggered by high-intensity sound stimulation.</abstract><cop>Netherlands</cop><pub>Elsevier B.V</pub><pmid>29225049</pmid><doi>10.1016/j.brainres.2017.12.001</doi><tpages>8</tpages></addata></record>
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source MEDLINE; Elsevier ScienceDirect Journals
subjects Acoustic Stimulation - adverse effects
Adenosine Triphosphatases - metabolism
Animals
Audiogenic seizures
Brain Stem - enzymology
Brain Stem - pathology
Disease Models, Animal
Glutathione Peroxidase - metabolism
K-ATPase
Kindling, Neurologic - physiology
Lipid composition
Lipid Peroxidation
Neurons - enzymology
Oxidative stress
Oxidative Stress - physiology
Prosencephalon - enzymology
Prosencephalon - pathology
Protein Isoforms - metabolism
Rats
Rats, Wistar
Seizures - etiology
Seizures - metabolism
Seizures - pathology
Sodium-Potassium-Exchanging ATPase - metabolism
Wistar audiogenic rats
title Oxidative stress and Na,K-ATPase activity differential regulation in brainstem and forebrain of Wistar Audiogenic rats may lead to increased seizure susceptibility
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