2,2'-Disseleneto de ditienila, um composto orgânico de selênio com atividade antioxidante e neuroprotetora em ratos

• Autor(a) principal: Bortolatto, Cristiani Folharini
• Data de Publicação: 2012
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Manancial - Repositório Digital da UFSM
• Texto Completo: http://repositorio.ufsm.br/handle/1/11186
• topic: Epilepsia do lobo temporal; Neurotoxicidade; Estresse oxidativo; Depressão; Selênio; Ratos; Temporal lobe epilepsy; Neurotoxicity; Oxidative stress; Depression; Selenium; Rats; CNPQ::CIENCIAS BIOLOGICAS::BIOQUIMICA

Oxidative stress has been implicated in the pathophysiology of several neurological diseases since the brain is an organ highly susceptible to oxidative damage. Temporal lobe epilepsy (TLE) has been widely studied due to the high prevalence rate and refractoriness to drug treatment. In addition, the ELT can be associated with psychiatric comorbidities, such as depression. Since many organoselenium compounds have antioxidant and neuroprotective properties, this study investigated the effects of 2,2'-dithienyl diselenide (DTDS) on seizures induced by kainic acid (KA), an experimental model of TLE, as well as its antioxidant potential in vitro and antidepressant-like activity in rats. The results showed that DTDS (100 mg/kg, per oral) reduced seizures induced by KA administration (10 mg/kg, intraperitoneal), which were demonstrated by behavioral tests and electroencephalographic analysis. The increase in the hippocampal content of reactive species and protein carbonylation as well as the stimulation of Na+ K+ ATPase activity caused by KA were reduced by DTDS (50 and 100 mg/kg). In addition, DTDS (100 mg/kg) protected against hippocampal degeneration resulting from exposure of rats to KA. DTDS, at low concentrations (μM range), reduced the content of reactive species, protein carbonylation and lipid peroxidation in rat brain homogenate in vitro and presented mimetic properties to dehydroascorbate (DHA) reductase and glutathione Stransferase (GST), important enzymes for antioxidant function. The results also revealed that DTDS was effective in inhibiting the activity of monoamine oxidase (MAO) A and B in rat brain homogenate in vitro (25-100 μM) and in causing a reduction on immobility time of rats in the forced swimming test (FST) (50 and 100 mg/kg, per oral). These findings suggest that DTDS produced an anticonvulsant action in the KA model and attenuated the subsequent oxidative damage and neuronal loss in hippocampus. Furthermore, the data showed that DTDS had antioxidant and MAO non-selective inhibitor effects in rat brain in vitro and antidepressant-like action in rats. Therefore, DTDS may be useful as a therapy for the treatment of comorbidity ELT/depression.