RESUMO
Caenorhabditis elegans is an established model organism in neurodegeneration and aging research. Oxidative stress and formation of advanced glycation endproducts (AGEs), as they occur under hyperglycemic conditions in diabetes mellitus, contribute to neuronal damage and lifespan reduction. Sulforaphane (SFN) is an indirect antioxidant, alpha-tocopherol (vitamin E) is a direct antioxidant that acts as a free radical scavenger. Aim of this study is to investigate the protective effects of SFN and vitamin E against glucotoxic damages to the neuronal system and lifespan in C. elegans. Culture conditions that mimic clinical hyperglycemia increased the formation of reactive oxygen species (ROS) (p<0.001) and the accumulation of methylglyoxal-derived advanced glycation endproducts (MG-derived AGEs) (p<0.01) with subsequent neuronal damage and neuronal dysfunction, ultimately leading to a significant shortening of lifespan (p<0.01). Treatment with both, 20 µmol/l SFN and 200 µg/ml vitamin E, completely prevented the increase in ROS and MG-derived AGEs, abolished the glucotoxic effects on neuronal structure and function, and preserved lifespan, resulting in a life expectancy similar to untreated controls. These data emphasize the relevance of indirect and direct antioxidants as potential therapeutic options for the prevention of glucotoxic pathologies.
Assuntos
Antioxidantes/farmacologia , Produtos Finais de Glicação Avançada/efeitos dos fármacos , Hiperglicemia/tratamento farmacológico , Isotiocianatos/farmacologia , Longevidade/efeitos dos fármacos , Doenças Neurodegenerativas/tratamento farmacológico , Sulfóxidos/farmacologia , Vitamina E/farmacologia , Animais , Antioxidantes/administração & dosagem , Caenorhabditis elegans , Modelos Animais de Doenças , Quimioterapia Combinada , Hiperglicemia/metabolismo , Isotiocianatos/administração & dosagem , Doenças Neurodegenerativas/metabolismo , Sulfóxidos/administração & dosagem , Vitamina E/administração & dosagemRESUMO
The authors tested whether use of an electro shock weapon (stun gun) leaves marks on skin which can be found in an exterior examination. On pig skin such marks could not be produced postmortally. An experiment on one of the authors caused reddish skin marks which persisted for about 2 h. Inability to act as promised by the weapons' manufacturers did not occur in our experiments, exactly as previously described by other authors. Use of an air tester which shoots barbed electrodes ought to produce bleedings if the electrodes actually penetrate the skin.
