Data/hora: 05/06/2024 17:31:01

Provedor de dados: | 56
País: | Brazil
Título: | Ethidium bromide-induced demyelination of the sciatic nerve of adult Wistar rats
Autores: | Riet-Correa,G.; Fernandes,C.G.; Pereira,L.A.V.; Graça,D.L.
Data: | 2002-01-01
Ano: | 2002
Palavras-chave: | Demyelination; Remyelination; Sciatic nerve; Ethidium bromide.
Resumo: | Peripheral nerve ultrastructure was assessed after single or multiple local injections of the intercalating dye ethidium bromide. Thirty-four adult Wistar rats of both sexes were divided into five groups and maintained in a controlled environment with rat chow and water ad libitum throughout the experiment. The experimental animals were injected with 1 µl of 0.1% ethidium bromide in 0.9% saline into the central third of the left sciatic nerve 1 (group 1), 2 (group 2), 4 (group 3), 6 (group 4) or 8 (group 5) times. In groups 2 to 5 the injections were made at 28-day intervals. Control animals received the same amount of 0.9% saline. The animals were killed at different times after injection: group 1 at 7 days (2 rats) and 15 days (2 rats); for groups 2, 3, 4 and 5, all rats were killed 10 days after the last injection and the lesions were investigated by light and transmission electron microscopy. In the acute lesions, intoxicated Schwann cells showed a vacuolated cytoplasm and separation of the sheaths from the axon. Myelin sheaths underwent progressive vesiculation and subsequent segmental demyelination. Myelin debris were withdrawn by macrophages and remyelination by Schwann cells was prominent. With the increase in the number of injections collagen fibers also increased in number and progressively enveloped smaller numbers of remyelinated axons composing new fascicles. Wallerian degeneration of fibers apparently not affected by ethidium bromide was more intense in the nerves from groups 4 and 5. The peripheral nerve repairs itself after demyelinating challenges with a profusion of collagen fibers and new fasciculations. This experimental model is valid to mimic recurrent demyelinating neuropathies.
Tipo: | Info:eu-repo/semantics/article
Idioma: | Inglês
Identificador: | http://www.scielo.br/scielo.php?script=sci_arttext&pid=S0100-879X2002000100014
Editor: | Associação Brasileira de Divulgação Científica
Relação: | 10.1590/S0100-879X2002000100014
Formato: | text/html
Fonte: | Brazilian Journal of Medical and Biological Research  v.35 n.1 2002
Fonte: | info:eu-repo/semantics/openAccess