RESUMO
The hypothesis of this study is that the cerebral cortex, hippocampus, and striatum of the rat brain are differentially affected in terms of oxidative stress and antioxidant capacity by acute Fe overload because Fe is distributed in a heterogeneous fashion among different regions and cells of the brain. The effects on the lipophilic and hydrophilic cellular environment were compared between regions and with the whole brain. A single dose of Fe-dextran increased Fe deposits, reaching a maximum after 6 hr. Both in whole brain and in cortex region, the ascorbyl/ascorbate content ratio was increased after 6 hr of Fe administration, while in striatum and hippocampus, there was no significant changes after Fe overload. Total thiol content decreased in whole brain and cortex, while there were no significant changes in striatum and hippocampus after Fe overload. The content of α-tocopherol (α-T), whether measured in the whole brain or in the isolated regions, did not change following Fe treatment. Lipid radical (LRâ¢) generation rate after Fe-dextran overload only increased in the cortex region. The LRâ¢/α-T content ratio was increased by Fe treatment in cortex but not in the whole brain, striatum, or hippocampus, in agreement with the study tested hypothesis.
Assuntos
Antioxidantes/metabolismo , Encéfalo/metabolismo , Sobrecarga de Ferro/metabolismo , Estresse Oxidativo/efeitos dos fármacos , Doença Aguda , Animais , Encéfalo/efeitos dos fármacos , Córtex Cerebral/efeitos dos fármacos , Córtex Cerebral/metabolismo , Corpo Estriado/efeitos dos fármacos , Corpo Estriado/metabolismo , Hipocampo/efeitos dos fármacos , Hipocampo/metabolismo , Complexo Ferro-Dextran/administração & dosagem , Complexo Ferro-Dextran/farmacocinética , Masculino , Ratos Sprague-Dawley , Distribuição TecidualRESUMO
A simple technique for recording the EKG of the posterior lymphatic hearts of the toad Bufo arenarum (Hensel) in free moving unanesthetized specimens is described. This technique permits long term chronic recordings in varied physiological and behavioral conditions whereas it overcomes some of the technical difficulties encountered in obtaining reliable recordings.
Assuntos
Animais , Bufo arenarum , Eletrocardiografia , Coração/fisiologia , Técnicas de Cultura de Órgãos , Sistema Linfático/fisiologiaRESUMO
A simple technique for recording the EKG of the posterior lymphatic hearts of the toad Bufo arenarum (Hensel) in free moving unanesthetized specimens is described. This technique permits long term chronic recordings in varied physiological and behavioral conditions whereas it overcomes some of the technical difficulties encountered in obtaining reliable recordings.(AU)
