• Mauren Assis Souza, Mauro Schneider Oliveira, Ana Flávia Furian, Leonardo Magno Rambo, Leandro Rodrigo Ribeiro, Frederico Diniz Lima, Liriana Correa Dalla Corte, Luiz Fernando Almeida Silva, Leandro Thies Retamoso, Cristiane Lenz Dalla Corte, Gustavo Orione Puntel, Daiana Silva de Avila, Félix Alexandre Antunes Soares, Michele Rechia Fighera, Carlos Fernando de Mello, and Luiz Fernando Freire Royes.
• Departamento de Fisiologia e Farmacologia, Laboratório de Neurotoxicidade e Psicofarmacologia, Centro de Ciências da Saúde, Universidade Federal de Santa Maria, Santa Maria, RS, Brazil.
• Epilepsia. 2009 Apr 1;50(4):811-23.

PurposeIn the present study we decided to investigate whether physical exercise protects against the electrographic, oxidative, and neurochemical alterations induced by subthreshold to severe convulsive doses of pentyltetrazole (PTZ).MethodsThe effect of swimming training (6 weeks) on convulsive behavior induced by PTZ (30, 45, and 60 mg/kg, i.p.) was measured and different electrographic electroencephalography (EEG) frequencies obtained from freely moving rats. After EEG recordings, reactive oxygen species (ROS) generation, nonprotein sulfhydryl (NPS), protein carbonyl, thiobarbituric acid-reactive substances (TBARS), superoxide dismutase (SOD), catalase (CAT), Na(+), K(+)-ATPase activity, and glutamate uptake were measured in the cerebral cortex of rats.ResultsWe showed that physical training increased latency and attenuated the duration of generalized seizures induced by administration of PTZ (45 mg/kg). EEG recordings showed that physical exercise decreased the spike amplitude after PTZ administration (all doses). Pearson's correlation analysis revealed that protection of physical training against PTZ-induced seizures strongly correlated with NPS content, Na(+), K(+)-ATPase activity, and glutamate-uptake maintenance. Physical training also increased SOD activity, NPS content, attenuated ROS generation per se, and was effective against inhibition of Na(+), K(+)-ATPase activity induced by a subthreshold convulsive dose of PTZ (30 mg/kg). In addition, physical training protected against 2',7'-dichlorofluorescein diacetate (DCFH-DA) oxidation, TBARS and protein carbonyl increase, decrease of NPS content, inhibition of SOD and catalase, and inhibition glutamate uptake induced by PTZ.ConclusionsThese data suggest that effective protection of selected targets for free radical damage, such as Na(+), K(+)-ATPase, elicited by physical training protects against the increase of neuronal excitability and oxidative damage induced by PTZ.

43 keywords...

hide…