Estudo do processo convulsivo e das ações da nimodipina no modelo de convulsão com pilocarpina em ratos jovens

Detalhes bibliográficos
Ano de defesa: 2005
Autor(a) principal: Nascimento, Viviane da Silva
Orientador(a): Não Informado pela instituição
Banca de defesa: Não Informado pela instituição
Tipo de documento: Dissertação
Tipo de acesso: Acesso aberto
Idioma: por
Instituição de defesa: Não Informado pela instituição
Programa de Pós-Graduação: Não Informado pela instituição
Departamento: Não Informado pela instituição
País: Não Informado pela instituição
Palavras-chave em Português:
Link de acesso: http://www.repositorio.ufc.br/handle/riufc/2644
Resumo: Behavioral and neurochemical studies were carried out with 21 days-old rats pretreated or not with nimodipine (10 or 30mg/Kg, i.p.) on pilocarpine-induced seizures (400mg/Kg, s.c.) to investigate the mechanism involved in the acute phase of seizures and the effects of nimodipine on seizures. The behavioral studies showed peripheral cholinergic signs, stereotyped movements, convulsions, status epilepticus in all animals and death in less degree after administration of P400, and the pretreatment with nimodipine reduced convulsions, the latency of first convulsion and death. Neurochemical studies in striatum showed levels increased of lipid peroxidation, nitrite and catalase activity, and nimodipine reverted this effect. Biochemical studies showed that striatum cholinergic and dopaminergic receptors in young rats were decreased after observation period, while the Kd values decreased only in D2 dopaminergics receptors. P400 decreased dopamine and serotonin levels and their metabolites DOPAC and 5-HIAA, respectively; otherwise, the dopaminergic HVA metabolite was increased. In this time, the pretreatment with nimodipine decreased dopaminergic metabolite and increased serotonergic, HVA and 5-HIAA, respectively. Our results showed that young animals are sensitive to epileptogenic stimuli, but they are relatively resistant to death, and nimodipine exhibited a protective effect on the pilocarpine-induced seizures. However, the knowledge of seizures physiopathology and effects of nimodipine on seizures should be better investigated.