Efeito da reposição hormonal no hipocampo de ratas adultas castradas submetidas ao modelo experimental de epilepsia induzido por pilocarpina
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Data
2005
Autores
Valente, Sandra Gomes [UNIFESP]
Orientadores
Scerni, Debora Amado [UNIFESP]
Tipo
Tese de doutorado
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0 modelo experimental de epilepsia, induzido por pilocarpina, em fêmeas inicialmente descrito por Amado e cols., (1993). Após esses achados, vários estudos continuaram a ser efetuados na tentativa de se obter um conhecimento maior do envolvimento hormonal no fenômeno epileptogênico. Nesse sentido, este trabalho teve como objetivo, estudar a função dos hormônios sexuais no modelo de epilepsia induzido por pilocarpina, em ratas castradas. Utilizamos como grupo de estudos: (a) animais controles (estro, metaestro, diestro, proestro e castradas), (b) animais experimentais, que receberam pilocar pina e foram estudados na fase crônica do modelo (intacta crônica e castrada crônica) e (c) animais castrados, que na fase crônica do modelo foram submetidas à terapia de reposição hormonal (castrada crônica tratada com acetato de medroxiprogesterona, castrada crônica tratada com 17beta-estradiol e castrada crônica tratada com acetato de medroxiprogesterona + 17beta-estradiol. Pudemos verificar que todos os animais castrados tiveram atrofia genital após 4 dias do procedimento cirúrgico. Além disso, todos os animais que receberam pilocarpina apresentaram crises espontâneas e recorrentes na fase crônica. O estudo da distribuição hipocampal de parvalbumina mostrou que a marcação para esta proteína sofre flutuações durante as fases ao ciclo estral e apresenta maior marcação no grupo de ratas castradas que receberam acetato de medoxiprogesterona + 17beta-estradiol. Em relação à freqüência de crises o melhor tratamento após a castração foi aquele onde houve reposição de acetato de medoxiprogesterona + 17beta-estradiol. Entretanto, animais que receberam a reposição somente com acetato de medoxiprogesterona também tiveram redução do número de crises. Além disso, o tratamento hormonal também foi capaz de estabilizar o brotamento supragranular de fibras musgosas, mostrando a importância desses hormônios no desenvolvimento da epilepsia em fêmeas.
The epilepsy model, induced by pilocarpine, in females was described by Amado et al., (1993) and was been used to understand the effect of hormones in epileptogenesis. Therefore this work was as objective, to study the function of sexual hormones in the epilepsy model induced by pilocarpine in castrated rats. We use as groups: (a) controls animals (estrus, metaestrus, diestrus, proestrus and castrated), (b) experimental animals, that was received pilocarpine and it was studied in the chronic phase of the model (normal chronic and castrated chronic) and (c) castrated animals, that in the chronic phase it was submitted to the hormonal replace therapy (castrated chronic treated with medroxiprogesterone acetate, castrated chronic treated with 17β- estradiol and castrated chronic treated with medroxiprogesterone acetate + 17β-estradiol. We could verify that all the castrated animals were genital atrophy 4 days of the surgical procedure. Moreover, all the animals that were received pilocarpine presented spontaneous recurrent seizures in the chronic phase. The study of the hipocampal distribution of parvalbumine showed that the staining for this protein presents fluctuations during the phases from the estrous cycle and presents greater staining in the group of castrated rats that was received medoxiprogesterone acetate + 17β-estradiol. In the frequency of seizures the best treatment after the castration was that one where medoxiprogesterone acetate + 17β-estradiol. However, animals that received the replacement only medoxiprogesterone acetate also was reduction of the number of seizures. Moreover, the hormonal treatment also was capable os stabilize the sprouting mossy fibers, showing the importance of these hormones in the development of the epilepsy in females rats.
The epilepsy model, induced by pilocarpine, in females was described by Amado et al., (1993) and was been used to understand the effect of hormones in epileptogenesis. Therefore this work was as objective, to study the function of sexual hormones in the epilepsy model induced by pilocarpine in castrated rats. We use as groups: (a) controls animals (estrus, metaestrus, diestrus, proestrus and castrated), (b) experimental animals, that was received pilocarpine and it was studied in the chronic phase of the model (normal chronic and castrated chronic) and (c) castrated animals, that in the chronic phase it was submitted to the hormonal replace therapy (castrated chronic treated with medroxiprogesterone acetate, castrated chronic treated with 17β- estradiol and castrated chronic treated with medroxiprogesterone acetate + 17β-estradiol. We could verify that all the castrated animals were genital atrophy 4 days of the surgical procedure. Moreover, all the animals that were received pilocarpine presented spontaneous recurrent seizures in the chronic phase. The study of the hipocampal distribution of parvalbumine showed that the staining for this protein presents fluctuations during the phases from the estrous cycle and presents greater staining in the group of castrated rats that was received medoxiprogesterone acetate + 17β-estradiol. In the frequency of seizures the best treatment after the castration was that one where medoxiprogesterone acetate + 17β-estradiol. However, animals that received the replacement only medoxiprogesterone acetate also was reduction of the number of seizures. Moreover, the hormonal treatment also was capable os stabilize the sprouting mossy fibers, showing the importance of these hormones in the development of the epilepsy in females rats.
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Citação
VALENTE, Sandra Gomes. Efeito da reposição hormonal no hipocampo de ratas adultas castradas submetidas ao modelo experimental de epilepsia induzido por pilocarpina. 2005.156 f. Tese (Doutorado em Ciências) - Escola Paulista de Medicina, Universidade Federal de São Paulo, São Paulo, 2005.