estudo qualitativo da formação hipocampal de animais hipertensos com epilepsia qualitative study of hippocampal formation in hypertensive rats with epilepsy

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ID: 155845
2005
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Abstract
O objetivo deste estudo foi avaliar qualitativamente o hipocampo e o giro dentado de ratos espontaneamente hipertensos (SHR) com epilepsia. MÉTODO: Os animais foram divididos em 4 grupos: Wistar controle, Wistar com epilepsia, SHR controle e SHR com epilepsia. Para indução da epilepsia, utilizamos o modelo da pilocarpina. Após os animais apresentarem crises espontâneas e recorrentes, o tecido cerebral dos animais foi encaminhado para análise histológica através dos métodos de Nissl e neo-Timm. RESULTADOS: Nos animais Wistar e SHR controle submetidos à coloração de Nissl observamos a manutenção das camadas celulares da formação hipocampal. Nos animais Wistar com epilepsia verificamos intensa morte neuronal na região CA1 e CA3 do hipocampo e no hilo do giro dentado. Nos animais SHR com epilepsia verificou-se a presença de atrofia hipocampal com dilatação do sistema ventricular. A coloração de neo-Timm revelou a presença de brotamento supragranular em todos os animais com epilepsia. CONCLUSÃO: Foram encontradas alterações neuropatológicas na citoarquitetura hipocampal nos animais Wistar com epilepsia e SHR com epilepsia, demonstrando que a epilepsia isoladamente ou associadamente à hipertensão são capazes de causar destruição neuronal.
The aim of our study was to investigate the hippocampus and dentate gyrus neuropathological features of spontaneous hypertensive rats (SHR) with epilepsy. METHOD: Animals were randomly divided into 4 groups: control Wistar, Wistar with epilepsy, control SHR and SHR with epilepsy. The pilocarpine model of epilepsy was used in this experiement. After spontaneous recurrent seizures, all animals were perfused and their brains processed for histological analysis through Nissl and neo-Timm methods. RESULTS: In the Wistar rats with epilepsy we observed cell loss in hippocampal subfields CA1, CA3 and hilus of the dentate gyrus when compared with control animals. In the SHR with epilepsy we observed hippocampal formation atrophy with ventricular dilatation. No morphological alterations were observed in SHR and Wistar control rats. The neo-Timm staining of hippocampal formation has shown supragranular sprouting in Wistar and SHR with epilepsy. CONCLUSION: We found neuropathological alterations in hippocampal formation in Wistar with epilepsy and SHR with epilepsy, suggesting that epilepsy per se or associated to hypertention are able to cause neuronal damage.
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Authors ;Fulvio Alexandre Scorza;Ricardo Mario Arida;Roberta Monterazzo Cysneiros;Carla Alessandra Scorza;Marly de Albuquerque;Esper Abrão Cavalheiro
Journal communications in computer and information science
Year 2005
DOI
10.1590/S0004-282X2005000200015
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0004-282X2005000200015
Keywords
epilepsy seizure arterial hypertension neuropsychiatry biological psychiatry hipertensão arterial pilocarpineneurosciences

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