efeito do lítio sobre a hiperatividade locomotora induzida pela lesão eletrolítica da região do núcleo mediano da rafe em ratos effect of lithium treatment on the locomotor hyperactivity induced by the lesion of the region of the median raphe nucleus in rats

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ID: 128335
2012
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Abstract
A lesão do núcleo mediano da rafe (NMR) produz sintomas que sugerem validade de face ao episódio maníaco. Esta pesquisa avaliou o efeito do lítio sobre a hiperatividade locomotora induzida por esta lesão. Vinte e um ratos Wistar machos foram submetidos à lesão eletrolítica da região do NMR (LR) e 17 foram submetidos à lesão fictícia (LF). Após recuperação, a atividade locomotora foi avaliada na caixa de atividade (Med Associates/ENV-515). Parte dos animais destes grupos recebeu tratamentos com lítio (47,5 mg/kg/2x dia i.p.) por 10 dias, enquanto o restante foi tratado com salina no mesmo esquema. A reavaliação ao final dos tratamentos demonstrou que o lítio reduziu significantemente a atividade locomotora em relação à avaliação inicial no grupo LR (ANOVA/Bonferroni p < 0,05), tornando-a equivalente aos baixos níveis dos grupos LF. Estes dados sustentam a hipótese de que as manifestações induzidas pela lesão do NMR podem constituir um modelo animal de mania.
The lesion of the Median Raphe Nucleus (MRN) produces symptoms that suggest face validity for manic episodes. This research evaluated the effect of lithium treatment on the locomotor hyperactivity induced by this lesion. Twenty-one Wistar male rats were submitted to the lesion of the region of the MRN (LR) and 17 were sham lesioned (LF). After recovery, the locomotor activity was evaluated in an activity chamber (Med Associates/ENV-515). A subgroup received lithium (47.5 mg/kg/twice a day i.p.) for 10 days, while the other animals received saline in the same schedule. The reevaluation at the end of the treatments showed that only lithium significantly reduced the activity of LR group compared to baseline levels (ANOVA/Bonferroni p < 0.05), making it equivalent to low levels of LF groups. These data support the hypothesis that the behavioral manifestations induced by the lesion of the MRN may constitute an animal model of mania.
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Authors Fernanda Augustini Pezzato, Diego Bertanha Novais, Miriam Garcia-Mijares, Katsumasa Hoshino
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Journal mycopathologia
Year 2012
DOI
10.1590/S1413-294X2012000100015
URL
http://www.scielo.br/scielo.php?script=sci_arttext&pid=S1413-294X2012000100015
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