desmielinização e remielinização após múltiplas injeções intramedulares de brometo de etídio em ratos wistar demyelination and remyelination after multiple intramedullary injections of ethidium bromide in wistar rats

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ID: 161670
1997
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Abstract
O modelo de desmielinização do brometo de etídio foi utilizado para estudar a reação do sistema nervoso central frente a múltiplos episódios de desmielinização tóxica. Foram utilizados 27 ratos Wistar, submetidos a 2,3 ou 4 injeções de 1μl de solução 0,1 % de brometo de etídio (19 ratos) ou de solução salina 0,9% (8 ratos) em diferentes pontos da medula espinhal. Os intervalos entre as injeções variaram de 28 a 42 dias. Dez dias após a última injeção os animais foram perfundidos com glutaraldeído 2,5%. As medulas espinhais foram avaliadas pela macroscopia, microscopia óptica de cortes semifinos e microscopia eletrônica de transmissão. As lesões foram caracterizadas por desmielinização primária focal, com preservação das estruturas vasculares, e variavam em tamanho e características histológicas. Remielinização pode ser observada, ou não, de acordo com o tipo de lesão. Como conseqüência das injeções múltiplas e seqüenciais de brometo de etídio, o sistema nervoso central pareceu modificar sua capacidade de responder a um estímulo inflamatório, mas não variou seu padrão de remielinização.
The ethidium bromide model of demyelination has been employed to study the central nervous system response to several episodes of demyelination. Twenty-seven Wistar rats received 2 to 4 intraspinal injections of lμl of either 0.1% ethidium bromide in normal saline (19 rats) or saline 0.9% (8 rats) in different anatomical locations. The intervals between the injections ranged from 28 to 42 days. Ten days after the last injection all the rats were perfused with 2.5% glutaraldehyde. The spinal sections were evaluated macroscopically and by light and transmission electron microscopy. The lesions were typical of focal primary demyelination with preserved vascular structures and followed by remyelinization and varied in size and histological aspects. After multiple sequential ethidium bromide injections, the central nervous system seems to modify its response capacity to an inflammatory challenge although there is no change in its pattern of remyelination.
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Authors ;Cristina Gevehr Fernandes;Dominguita Lühers Graça;Luis Antônio Violin Dias Pereira
Journal communications in computer and information science
Year 1997
DOI
10.1590/S0004-282X1997000300017
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0004-282X1997000300017
Keywords
central nervous system neuropsychiatry biological psychiatry ethidium bromideneurosciences

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