Efeito da exposição in vivo ao ditelureto de difenila em camundongos: evidências para estresse oxidativo

• Autor(a) principal: Comparsi, Bruna
• Data de Publicação: 2010
• Tipo de documento: Dissertação
• Idioma: por
• Título da fonte: Biblioteca Digital de Teses e Dissertações do UFSM
• Texto Completo: http://repositorio.ufsm.br/handle/1/11135
• topic: Ditelureto de difenila; Organotelúrio; Estresse oxidativo; Tocixidade; Enzimas antioxidantes; Camundongo; Diphenyl ditelluride; Organotellurium; Oxidative stress; Toxicity; Antioxidant enzymes; Mice; CNPQ::CIENCIAS BIOLOGICAS::BIOQUIMICA

In this work, we investigated the effect of (PhTe)2 administration (10 μmol/kg and 50 μmol/kg) to adult mice on the behavioral performance and on some parameters of oxidative stress in the brain ad liver. The animals received (PhTe)2 or canola oil via subcutaneous injection daily during the 7 days. Results demonstrated that after last (PhTe)2 administration the animals demonstrated the appearance of classic signs of toxicity (body weight loss), behavioral alterations and increased in lipid peroxidation levels in brain, however, the ROS generation was not modified. The exposure to (PhTe)2 caused inhibition of δ-ALA-D in blood samples from 50 μmol/kg. (PhTe)2 induced increased in the levels of NPSH and PSH, at all doses, in brain of adult mice. Unlike, in liver, (PhTe)2-exposure (50 μmol/kg) lead to decreased in NPSH. We also demonstrated that the (PhTe)2 modified the activity of the antioxidant enzymes by reducing CAT (10 μmol/kg), SOD (10 μmol/kg and 50 μmol/kg), GR (10 μmol/kg) , GPx (10 μmol/kg) and TrxR (10 μmol/kg and 50 μmol/kg) activity in brain. In liver, (PhTe)2 increase SOD (10 μmol/kg and 50 μmol/kg) and GR (50 μmol/kg) and decreased Gpx (10 μmol/kg and 50 μmol/kg) activity. Additionally, the data obtained here in suggest that brain were more susceptible to oxidative stress induced by (PhTe)2 than liver. Thus, the possible role of disrupted prooxidant/antioxidant balance in (PhTe)2 toxicity was demonstrated.