alexa Memantine prevents "bipolar-like" behavior induced by chronic treatment with imipramine in rats.
Neurology

Neurology

Bipolar Disorder: Open Access

Author(s): Demontis F, Falconi M, Canu D, Serra G, Demontis F, Falconi M, Canu D, Serra G

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Abstract A great deal of evidence suggests that virtually all antidepressant treatments induce a dopaminergic behavioral supersensitivity. We have suggested that this effect may play a key role not only in the antidepressant effect of these treatments, but also in their ability to induce a switch from depression to mania. In 2003-4 we found that the sensitization of dopamine receptors induced by imipramine is followed, after imipramine withdrawal, by a desensitization of these receptors associated with a depressive-like behavior assessed in the forced swimming test. The dopamine receptor sensitization can be prevented by MK-801, an NMDA receptor antagonist, but not by currently used mood stabilizers (lithium, carbamazepine, valproate). These observations led us to suggest - and later confirm - with preliminary clinical observations that memantine may have an acute antimanic and a long-lasting mood-stabilizing effect in treatment-resistant bipolar disorder patients. Here we present data showing that memantine prevents not only the dopamine receptor sensitization induced by imipramine, as observed with MK-801, but also the ensuing desensitization and the associated depressive-like behaviorq observed after antidepressant withdrawal. Copyright © 2015 Elsevier B.V. All rights reserved. This article was published in Eur J Pharmacol and referenced in Bipolar Disorder: Open Access

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