Nitric oxide synthase inhibition by L-NAME prevents the decrease of Na+,K+-ATPase activity in midbrain of rats subjected to arginine administration |
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Authors: | Wyse A T Bavaresco C S Bandinelli C Streck E L Franzon R Dutra-Filho C S Wajner M |
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Institution: | (1) Departamento de Bioquímica, ICBS, Universidade Federal do Rio Grande do Sul, Rua Ramiro Barcelos, 2600-Anexo, CEP 90035-003 Porto Alegre, R, S, Brazil |
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Abstract: | In the present study we investigated the effect of acute administration of L-arginine on Na+,K+-ATPase and Mg2+-ATPase activities and on some parameters of oxidative stress (chemiluminescence and total radical-trapping antioxidant parameter-TRAP) in midbrain of adult rats. We also tested the effect of L-NAME on the effects produced by arginine. Sixty-day-old rats were treated with an acute intraperitoneal injection of saline (group I, control), arginine (0.8 g/kg) (group II), L-NAME (2 mg/kg) (group III) or arginine (0.8 g/kg) plus L-NAME (2 mg/kg) (group IV). Na+,K+-ATPase activity was significantly reduced in the arginine-treated rats, but was not affected by other treatments. In contrast, Mg2+-ATPase activity was not altered by any treatment. Furthermore, chemiluminescence was significantly increased and TRAP was significantly decreased in arginine-treated rats, whereas the simultaneous injection of L-NAME prevented these effects. These results demonstrate that in vivo arginine administration reduces Na+,K+-ATPase activity possibly through free radical generation induced by NO formation. |
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Keywords: | Arginine administration L-NAME Na+ K+-ATPase oxidative stress |
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