Supragranular mossy fiber sprouting is not necessary for spontaneous seizures in the intrahippocampal kainate model of epilepsy in the rat

Supragranular mossy fiber sprouting is not necessary for spontaneous seizures in the intrahippocampal kainate model of epilepsy in the rat

Autor Longo, B. M. Google Scholar
Mello, LEAM Google Scholar
Instituição Universidade Federal de São Paulo (UNIFESP)
Resumo In a previous study, we suggested a dissociation between spontaneous recurrent epileptic seizures (SRS) and hippocampal supragranular mossy fiber sprouting (MFS) in the pilocarpine model of epilepsy (PILO). One possible explanation, would be that SRS in the PILO model do not originate in the hippocampus and thus would not depend on MFS. Tn the present study, we investigated whether MFS is necessary for the SRS that develop after a small intrahippocampal dose of kainic acid (KA), a model where seizures are more likely to start in the hippocampus. Intrahippocampal injections of ECA were performed in rats, with and without the concomitant administration of cycloheximide (CHX) (0.5 mu g of KA and 6 mu g of CHX). After injection, recording electrodes were positioned in the same stereotaxic location. Hen again, CHX was able to completely block (5/8 animals) MFS, visualized by neo-Timm staining, without altering the frequency and intensity of spontaneous ictal and interictal EEG events. From these data, we can conclude that, in the intra-hippocampal KA model, MFS is not necessary for the occurrence of ictal events. We suggest that CHX can be used together with classic epileptogenic agents, as a means to study temporal lobe epilepsy (TLE) without the contributing effect of MFS-as seen in TLE patients with mass lesions in the lateral temporal lobe. (C) 1999 Elsevier Science B.V. All rights reserved.
Assunto supragranular mossy fiber
seizure
temporal lobe
Idioma Inglês
Data 1998-09-01
Publicado em Epilepsy Research. Amsterdam: Elsevier B.V., v. 32, n. 1-2, p. 172-182, 1998.
ISSN 0920-1211 (Sherpa/Romeo, fator de impacto)
Editor Elsevier B.V.
Extensão 172-182
Fonte http://dx.doi.org/10.1016/S0920-1211(98)00049-7
Direito de acesso Acesso restrito
Tipo Artigo
Web of Science WOS:000076034000016
URI http://repositorio.unifesp.br/handle/11600/25954

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