Efeito antidepressivo da associação de mirtazapina e ácido lipóico via mecanismos antioxidativos

Abstract

Depression is a chronic, serious illness that affects about 350 million people worldwide. The objective of this work was to study the antidepressant effects of lipoic acid (ALA) associated with mirtazapine (MIRT) via antioxidative mechanisms in animal models of depression induced by corticosterone. Adult male mice received 0.3% Tween 80, corticosterone (Cort 20 mg / kg) MIRT (3 mg / kg), ALA (100 or 200 mg / kg), alone or associated for 21 days. On the last day of treatment the animals were subjected to the following tests: open field, elevated plus maze, tail suspension, preference for sucrose, route rod and sleep time. Oxidative changes (reduced glutathione and GSH-peroxidation lipídica- MDA) and nitrite in the prefrontal cortex (PFC), hippocampus (HC) and striatum (CE); and brain-derived neurotrophic factor (BDNF) in the CPF and HC were also addressed. Chronic administration of CORT developed some kind-depressive behaviors were reversed with MIRT and / or ALA. The association of ALA and MIRT reversed the sedative effect caused by the administration alone MIRT, as hypersomnia caused by the chronic administration of CORT. The administration CORT ALA 200 and associated MIRT showed significant increase in GSH levels in the prefrontal cortex (113%), hippocampus (90.27%) and striatum (127%) compared to the group treated with CORT alone; Similar effects were observed on lipid peroxidation and nitrite levels with reduction of MDA and nitrite levels in the hippocampus and striatum in the groups treated with the combination CORT ALA MIRT 200 and compared with the group treated with CORT alone respectively. Overall, ALA seems to be an alternative for treatment of depression associated with MIRT when, for neuroprotection increases and reduces the side effect of sedation.