Effects of lithium and valproate on amphetamine-induced oxidative stress generation in an animal model of mania

Departamento de Bioquímica, Instituto de Ciências Básicas da Saúde, Universidade Federal do Rio Grande do Sul, and the Bipolar Disorders Program, Hospital de Clínicas de Porto Alegre, Porto Alegre, Brazil.
Journal of psychiatry & neuroscience: JPN (Impact Factor: 5.86). 10/2006; 31(5):326-32.
Source: PubMed


Previous studies have suggested that oxidative stress may play a role in the pathophysiology of bipolar disorder (BD). Moreover, recent studies indicate that lithium and valproate exert neuroprotective effects against oxidative stress. We studied the effects of the mood stabilizers lithium and valproate on amphetamine-induced oxidative stress in an animal model of mania.
In the first model (reversal treatment), adult male Wistar rats received d-amphetamine or saline for 14 days, and between the 8th and 14th days, they were treated with lithium, valproate or saline. In the second model (prevention treatment), rats were pretreated with lithium, valproate or saline, and between the 8th and 14th days, they received d-amphetamine or saline. We assessed locomotor activity with the open-field task. We measured thiobarbituric acid reactive substances (TBARS) and protein carbonyl formation, as parameters of oxidative stress, and superoxide dismutase (SOD) and catalase (CAT), the major antioxidant enzymes, in the prefrontal cortex and hippocampus.
Lithium and valproate reversed (reversal treatment model) and prevented (prevention treatment model) amphetamine-induced hyperactivity and reversed and prevented amphetamine-induced TBARS formation in both experiments. However, the co-administration of lithium or valproate with amphetamine increased lipid peroxidation, depending on the brain region and treatment regimen. No changes in protein carbonyl formation were observed. SOD activity varied with different treatment regimens, and CAT activity increased when the index of lipid peroxidation was more robust.
Our findings suggest that lithium and valproate exert protective effects against amphetamine-induced oxidative stress in vivo, further supporting the hypothesis that oxidative stress may be associated with the pathophysiology of BD.

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Available from: Fabrícia Petronilho, May 23, 2014
    • "In our experimental protocol, lithium was not able to significantly prevent or reverse the alteration in GSH and in some cases lipid peroxidation levels, being capable to prevent the increase in lipid peroxidation induced by AMPH in the hippocampus. A previous study in which lithium was administered twice daily had shown that depending on the brain area and protocol (i.e., prevention or reversal) studied, coadministration of lithium and AMPH increased lipid peroxidation when compared to control animals (Frey et al., 2006b). A tentative explanation for the discrepancy between these previous findings (Frey et al., 2006b) and ours is that we used a single-dose schedule for lithium administration. "
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